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Background Telerehabilitation programs are designed with the aim of improving the quality of services as well as overcoming existing limitations in terms of resource management and accessibility of services. This review will collect recent studies investigating telerehabilitation programs for patients with knee osteoarthritis while focusing on the technologies and services provided in the programs. Objective The main objective of this review is to identify and discuss the modes of service delivery and technologies in telerehabilitation programs for patients with knee osteoarthritis. The gaps, strengths, and weaknesses of programs will be discussed individually. Methods Studies published in English since 2000 were retrieved from the EMBASE, Scopus, Web of Science, Cumulative Index to Nursing and Allied Health Literature (CINAHL), PubMed, Physiotherapy Evidence Database (PEDro), and PsycINFO databases. The search words “telerehabilitation,” “telehealth,” “telemedicine,” “teletherapy,” and “ehealth” were combined with “knee” and “rehabilitation” to generate a data set of studies for screening and review. The final group of studies reviewed here includes those that implemented teletreatment for patients for at least 2 weeks of rehabilitation. Results In total, 1198 studies were screened, and the full text of 154 studies was reviewed. Of these, 38 studies were included, and data were extracted accordingly. Four modes of telerehabilitation service delivery were identified: phone-based, video-based, sensor-based, and expert system–based telerehabilitation. The intervention services provided in the studies included information, training, communication, monitoring, and tracking. Video-based telerehabilitation programs were frequently used. Among the identified services, information and educational material were introduced in only one-quarter of the studies. Conclusions Video-based telerehabilitation programs can be considered the best alternative solution to conventional treatment. This study shows that, in recent years, sensor-based solutions have also become more popular due to rapid developments in sensor technology. Nevertheless, communication and human-generated feedback remain as important as monitoring and intervention services.
Mreza Naeemabadi; Hesam Fazlali; Samira Najafi; Birthe Dinesen; John Hansen. Telerehabilitation for Patients With Knee Osteoarthritis: A Focused Review of Technologies and Teleservices. JMIR Biomedical Engineering 2020, 5, e16991 .
AMA StyleMreza Naeemabadi, Hesam Fazlali, Samira Najafi, Birthe Dinesen, John Hansen. Telerehabilitation for Patients With Knee Osteoarthritis: A Focused Review of Technologies and Teleservices. JMIR Biomedical Engineering. 2020; 5 (1):e16991.
Chicago/Turabian StyleMreza Naeemabadi; Hesam Fazlali; Samira Najafi; Birthe Dinesen; John Hansen. 2020. "Telerehabilitation for Patients With Knee Osteoarthritis: A Focused Review of Technologies and Teleservices." JMIR Biomedical Engineering 5, no. 1: e16991.
Telerehabilitation programs can be employed to establish communication between patients and healthcare professionals and empower patients performing their training remotely. This study aimed to identify patients’ requirements after a total knee replacement following a self-training rehabilitation program, leading to the design and development of a telerehabilitation program that can meet the stakeholders’ actual needs. System design, development, and testing were conducted in five iterations based on a participatory design approach. Data collection was performed using interviews, observations, prototyping, and questionnaires. It was found that the main barriers facing the existing rehabilitation program were a lack of clear communication, lack of relevant information, and healthcare professional’s feedback. The participants emphasized the main themes of communication, information, training, and motivation in the process of design and development. In using the telerehabilitation program, the patients reported a high level of user-friendliness, flexibility, and a sense of security. This study has identified obstacles in the current rehabilitation program and revealed the potential effectiveness of using asynchronous communication and sensor-based technologies by employing participatory design and development. A higher level of portability and flexibility were observed. However, future studies and development are required to investigate the overall usability and reliability of the telerehabilitation program.
Mreza Naeemabadi; Jesper Hessellund Søndergaard; Anita Klastrup; Anne Philbert Schlünsen; Rikke Emilie Kildahl Lauritsen; John Hansen; Niels Kragh Madsen; Ole Simonsen; Ole Kæseler Andersen; Katherine K Kim; Birthe Dinesen. Development of an individualized asynchronous sensor-based telerehabilitation program for patients undergoing total knee replacement: Participatory design. Health Informatics Journal 2020, 26, 2492 -2511.
AMA StyleMreza Naeemabadi, Jesper Hessellund Søndergaard, Anita Klastrup, Anne Philbert Schlünsen, Rikke Emilie Kildahl Lauritsen, John Hansen, Niels Kragh Madsen, Ole Simonsen, Ole Kæseler Andersen, Katherine K Kim, Birthe Dinesen. Development of an individualized asynchronous sensor-based telerehabilitation program for patients undergoing total knee replacement: Participatory design. Health Informatics Journal. 2020; 26 (4):2492-2511.
Chicago/Turabian StyleMreza Naeemabadi; Jesper Hessellund Søndergaard; Anita Klastrup; Anne Philbert Schlünsen; Rikke Emilie Kildahl Lauritsen; John Hansen; Niels Kragh Madsen; Ole Simonsen; Ole Kæseler Andersen; Katherine K Kim; Birthe Dinesen. 2020. "Development of an individualized asynchronous sensor-based telerehabilitation program for patients undergoing total knee replacement: Participatory design." Health Informatics Journal 26, no. 4: 2492-2511.
Rasmus Gundorff Sæderup; Henrik Zimmermann; Dagbjört Helga Eiríksdóttir; John Hansen; Johannes Struijk; Samuel Emil Schmidt. Comparison of Cardiotocography and Fetal Heart Rate Estimators Based on Non-Invasive Fetal ECG. 2019 Computing in Cardiology Conference (CinC) 2019, 1 .
AMA StyleRasmus Gundorff Sæderup, Henrik Zimmermann, Dagbjört Helga Eiríksdóttir, John Hansen, Johannes Struijk, Samuel Emil Schmidt. Comparison of Cardiotocography and Fetal Heart Rate Estimators Based on Non-Invasive Fetal ECG. 2019 Computing in Cardiology Conference (CinC). 2019; ():1.
Chicago/Turabian StyleRasmus Gundorff Sæderup; Henrik Zimmermann; Dagbjört Helga Eiríksdóttir; John Hansen; Johannes Struijk; Samuel Emil Schmidt. 2019. "Comparison of Cardiotocography and Fetal Heart Rate Estimators Based on Non-Invasive Fetal ECG." 2019 Computing in Cardiology Conference (CinC) , no. : 1.
Dagbjört Helga Eiríksdóttir; Rasmus Gundorff Sæderup; Diana Riknagel; Henrik Zimmermann; Maciej Plocharski; John Hansen; Johannes Struijk; Samuel Emil Schmidt. Quality Assessment of Maternal and Fetal Cardiovascular Sounds Recorded From the Skin Near the Uterine Arteries During Pregnancy. 2019 Computing in Cardiology Conference (CinC) 2019, 1 .
AMA StyleDagbjört Helga Eiríksdóttir, Rasmus Gundorff Sæderup, Diana Riknagel, Henrik Zimmermann, Maciej Plocharski, John Hansen, Johannes Struijk, Samuel Emil Schmidt. Quality Assessment of Maternal and Fetal Cardiovascular Sounds Recorded From the Skin Near the Uterine Arteries During Pregnancy. 2019 Computing in Cardiology Conference (CinC). 2019; ():1.
Chicago/Turabian StyleDagbjört Helga Eiríksdóttir; Rasmus Gundorff Sæderup; Diana Riknagel; Henrik Zimmermann; Maciej Plocharski; John Hansen; Johannes Struijk; Samuel Emil Schmidt. 2019. "Quality Assessment of Maternal and Fetal Cardiovascular Sounds Recorded From the Skin Near the Uterine Arteries During Pregnancy." 2019 Computing in Cardiology Conference (CinC) , no. : 1.
BACKGROUND Telerehabilitation programs are designed with the aim of improving the quality of services as well as overcoming existing limitations in terms of resource management and accessibility of services. This review will collect recent studies investigating telerehabilitation programs for patients with knee osteoarthritis while focusing on the technologies and services provided in the programs. OBJECTIVE The main objective of this review is to identify and discuss the modes of service delivery and technologies in telerehabilitation programs for patients with knee osteoarthritis. The gaps, strengths, and weaknesses of programs will be discussed individually. METHODS Studies published in English since 2000 were retrieved from the EMBASE, Scopus, Web of Science, Cumulative Index to Nursing and Allied Health Literature (CINAHL), PubMed, Physiotherapy Evidence Database (PEDro), and PsycINFO databases. The search words “telerehabilitation,” “telehealth,” “telemedicine,” “teletherapy,” and “ehealth” were combined with “knee” and “rehabilitation” to generate a data set of studies for screening and review. The final group of studies reviewed here includes those that implemented teletreatment for patients for at least 2 weeks of rehabilitation. RESULTS In total, 1198 studies were screened, and the full text of 154 studies was reviewed. Of these, 38 studies were included, and data were extracted accordingly. Four modes of telerehabilitation service delivery were identified: phone-based, video-based, sensor-based, and expert system–based telerehabilitation. The intervention services provided in the studies included information, training, communication, monitoring, and tracking. Video-based telerehabilitation programs were frequently used. Among the identified services, information and educational material were introduced in only one-quarter of the studies. CONCLUSIONS Video-based telerehabilitation programs can be considered the best alternative solution to conventional treatment. This study shows that, in recent years, sensor-based solutions have also become more popular due to rapid developments in sensor technology. Nevertheless, communication and human-generated feedback remain as important as monitoring and intervention services.
Mreza Naeemabadi; Hesam Fazlali; Samira Najafi; Birthe Dinesen; John Hansen. Telerehabilitation for Patients With Knee Osteoarthritis: A Focused Review of Technologies and Teleservices (Preprint). 2019, 1 .
AMA StyleMreza Naeemabadi, Hesam Fazlali, Samira Najafi, Birthe Dinesen, John Hansen. Telerehabilitation for Patients With Knee Osteoarthritis: A Focused Review of Technologies and Teleservices (Preprint). . 2019; ():1.
Chicago/Turabian StyleMreza Naeemabadi; Hesam Fazlali; Samira Najafi; Birthe Dinesen; John Hansen. 2019. "Telerehabilitation for Patients With Knee Osteoarthritis: A Focused Review of Technologies and Teleservices (Preprint)." , no. : 1.
Cardiovascular disease is the leading cause of all deaths worldwide. Cardiac rehabilitation is an effective approach for preventing secondary complications, but it remains a complex intervention because of the need for lifestyle changes. One solution is to employ interactive telerehabilitation or eHealth web portals. However, these have not been implemented as intended by developers. The aim of this study was to evaluate the design and usability of a cardiac telerehabilitation web portal, called the 'HeartPortal', for use among heart failure (HF) patients. The HeartPortal was designed using participatory design (PD). The design process involved HF patients, their relatives, healthcare professionals (HCP), healthcare company specialists and researchers. Self-determination theory (SDT) was used to enable the design to elicit intrinsic motivation within the patients. With eHealth literacy skills in mind, the goal of the HeartPortal was to successfully target the end-users. The PD process and data collection techniques included cultural probes, workshops, participant-observation, questionnaires, and problem-solving tasks. The PD process helped us design an interactive web portal, the HeartPortal. Based on participants' feedback, the design incorporated features such as being able to make notes and to communicate with HCP, view data from self-tracking devices in a graphic form, and to obtain information on rehabilitation in the form of text, audio, and video. More than half of those testing the HeartPortal found that it was easy to navigate, and most of the users stated that it had an excellent structure and that using it could possibly improve their condition. Overall, the HeartPortal was found to be logical and easy to navigate and will now be tested in a clinical trial within the Future Patient Telerehabilitation Program.
Katrine Joensson; Camilla Melholt; John Hansen; Soeren Leth; Helle Spindler; Mathias Vassard Olsen; Birthe Dinesen. Listening to the patients: using participatory design in the development of a cardiac telerehabilitation web portal. mHealth 2019, 5, 33 -33.
AMA StyleKatrine Joensson, Camilla Melholt, John Hansen, Soeren Leth, Helle Spindler, Mathias Vassard Olsen, Birthe Dinesen. Listening to the patients: using participatory design in the development of a cardiac telerehabilitation web portal. mHealth. 2019; 5 ():33-33.
Chicago/Turabian StyleKatrine Joensson; Camilla Melholt; John Hansen; Soeren Leth; Helle Spindler; Mathias Vassard Olsen; Birthe Dinesen. 2019. "Listening to the patients: using participatory design in the development of a cardiac telerehabilitation web portal." mHealth 5, no. : 33-33.
To investigate the region-specific effects of painful trigeminal capsaicin stimulation in healthy participants. Twenty healthy participants (10 men and 10 women) participated in four sessions in which they received application of 0.05 mL Vaseline (placebo) or capsaicin cream (0.1%) to a different area innervated by the three branches of the trigeminal nerve: the supraorbital area (V1), the nasal mucosa (V1/V2), and the maxillary (V2) and mandibular (V3) oral mucosa. The participants rated their perceived sensations on a 0-50-100 numeric rating scale (NRS). Thermal (5°C, 23°C, and 50°C) and mechanical (32 mN and 256 mN) sensitivities were assessed. The Schirmer tearing test was used to monitor the lacrimation level as a local measure of autonomic activity, and the Task Force Monitor was used to record systemic autonomic activity. Data were analyzed using repeated measures analysis of variance. Capsaicin application evoked significantly higher overall NRS scores (P < .001) and induced significantly higher ratings to the heat stimuli (P < .009) in all sessions compared to control. For lacrimation level, capsaicin stimulation resulted in a significant increase compared to control (P < .0002) only in the nasal mucosa session. Topical application of capsaicin cream to the different branches of the trigeminal nerve caused higher NRS scores along with an altered somatosensory sensitivity. Furthermore, in the nasal mucosa session, a robust local and generalized parasympathetic activation appeared following capsaicin application.
Catharina Egholm Poulsen; Karina Haugaard Bendixen; Astrid Juhl Terkelsen; Arne May; John Hansen; Peter Svensson. Region-Specific Effects of Trigeminal Capsaicin Stimulation. Journal of Oral & Facial Pain and Headache 2019, 33, 318 -330.
AMA StyleCatharina Egholm Poulsen, Karina Haugaard Bendixen, Astrid Juhl Terkelsen, Arne May, John Hansen, Peter Svensson. Region-Specific Effects of Trigeminal Capsaicin Stimulation. Journal of Oral & Facial Pain and Headache. 2019; 33 (3):318-330.
Chicago/Turabian StyleCatharina Egholm Poulsen; Karina Haugaard Bendixen; Astrid Juhl Terkelsen; Arne May; John Hansen; Peter Svensson. 2019. "Region-Specific Effects of Trigeminal Capsaicin Stimulation." Journal of Oral & Facial Pain and Headache 33, no. 3: 318-330.
IntroductionTelerehabilitation programmes have been attracting increasing attention as a potential alternative to conventional rehabilitation. Video conferencing can facilitate communication between healthcare professionals and patients. However, in certain cases, video conferencing may face practical limitations. As an alternative to real-time conferencing, sensor-based technologies can transmit the acquired data to healthcare providers. This study aimed to design and develop a sensor-based telerehabilitation programme and to outline the corresponding requirements for such a system.DevelopmentThe development of the sensor-based telerehabilitation programme was carried out based on user needs. The programme includes a portable platform for the patient as well as a web-based platform for the healthcare professional, thus allowing for an individualised rehabilitation programme. Communication, training, reporting, and information services were provided for the patients. Moreover, the portability and usability of the programme were enhanced by utilising the system in offline mode as well.ApplicationThe programme is currently being tested in the North Denmark Region to assess the feasibility and acceptance of a telerehabilitation programme as an alternative solution to the self-training programme for patients who have been discharged from knee surgery. The preliminary results of our assessment showed a high level of acceptance among the users.DiscussionIn this study, a semi-online sensor-based telerehabilitation programme was tested. It is argued that a similar sensor-based telerehabilitation programme can be utilised as an alternative solution for self-training rehabilitation in the future; however; further studies and development are required to ensure the quality and reliability of sensor-based services.
Mreza Naeemabadi; Birthe Dinesen; Ole Kæseler Andersen; Niels Kragh Madsen; Ole Højgaard Simonsen; John Hansen. Developing a telerehabilitation programme for postoperative recovery from knee surgery: specifications and requirements. BMJ Health & Care Informatics 2019, 26, e000022 .
AMA StyleMreza Naeemabadi, Birthe Dinesen, Ole Kæseler Andersen, Niels Kragh Madsen, Ole Højgaard Simonsen, John Hansen. Developing a telerehabilitation programme for postoperative recovery from knee surgery: specifications and requirements. BMJ Health & Care Informatics. 2019; 26 (1):e000022.
Chicago/Turabian StyleMreza Naeemabadi; Birthe Dinesen; Ole Kæseler Andersen; Niels Kragh Madsen; Ole Højgaard Simonsen; John Hansen. 2019. "Developing a telerehabilitation programme for postoperative recovery from knee surgery: specifications and requirements." BMJ Health & Care Informatics 26, no. 1: e000022.
Microsoft Kinect sensors are being widely used as low-cost marker-less motion capture systems in various kinematic studies. Previous studies investigated the reliability and validity of Microsoft Kinect sensors by employing marker-based motion capture systems. Both systems employ IR emitters and detectors to track human posture and physical activities. This paper hypothesizes that the motion capture systems may interfere with Microsoft Kinect One sensor and influence the sensor’s performance in tracking the skeleton. Hence, this study investigated the impact of a motion capture system on the Microsoft Kinect v2 skeleton algorithm using a mannequin in the presence of eight Qualisys Oqus 300/310 cameras and retroreflective markers. It was found that the motion capture system introduced a destructive impact on the Microsoft Kinect v2 skeleton tracking algorithm. In addition, it was observed that retroreflective markers placed near the joints caused the Microsoft Kinect v2 to give an incorrect reading of estimate the joint position. The motion capture cameras thus caused a timevarying distortion of the Microsoft Kinect estimate of the joint position. It is believed that the inference can be reduced by decreasing the number of markers and avoiding facing the motion capture cameras in sight of Microsoft Kinect v2.
Mreza Naeemabadi; Birthe Dinesen; Ole Kaeseler Andersen; John Hansen. Influence of a Marker-Based Motion Capture System on the Performance of Microsoft Kinect v2 Skeleton Algorithm. IEEE Sensors Journal 2018, 19, 171 -179.
AMA StyleMreza Naeemabadi, Birthe Dinesen, Ole Kaeseler Andersen, John Hansen. Influence of a Marker-Based Motion Capture System on the Performance of Microsoft Kinect v2 Skeleton Algorithm. IEEE Sensors Journal. 2018; 19 (1):171-179.
Chicago/Turabian StyleMreza Naeemabadi; Birthe Dinesen; Ole Kaeseler Andersen; John Hansen. 2018. "Influence of a Marker-Based Motion Capture System on the Performance of Microsoft Kinect v2 Skeleton Algorithm." IEEE Sensors Journal 19, no. 1: 171-179.
Microsoft Kinect sensors are considered to be low-cost popular RGB-D sensors and are widely employed in various applications. Consequently, several studies have been conducted to evaluate the reliability and validity of Microsoft Kinect sensors, and noise models have been proposed for the sensors. Several studies utilized motion capture systems as a golden standard to assess the Microsoft Kinect sensors, and none of them reported interference between Kinect sensors and motion capture systems. This study aimed to investigate possible interference between a golden standard (i.e., Qualisys) and Microsoft Kinect v2. The depth recordings of Microsoft Kinect sensors were processed to estimate the intensity of interference. A flat non-reflective surface was utilized, and smoothness of the surface was measured using Microsoft Kinect v2 in absence and presence of an active motion capture system. The recording was repeated in five different distances. The results indicated that Microsoft Kinect v2 is distorted by the motion capture system and the distortion is increasing by increasing distance between Kinect and region of interest. Regarding the results, it can be concluded that the golden standard motion capture system is robust against interference from the Microsoft Kinect sensors.
Mreza Naeemabadi; Birthe Dinesen; Ole Kæseler Andersen; John Hansen. Investigating the impact of a motion capture system on Microsoft Kinect v2 recordings: A caution for using the technologies together. PLoS ONE 2018, 13, e0204052 .
AMA StyleMreza Naeemabadi, Birthe Dinesen, Ole Kæseler Andersen, John Hansen. Investigating the impact of a motion capture system on Microsoft Kinect v2 recordings: A caution for using the technologies together. PLoS ONE. 2018; 13 (9):e0204052.
Chicago/Turabian StyleMreza Naeemabadi; Birthe Dinesen; Ole Kæseler Andersen; John Hansen. 2018. "Investigating the impact of a motion capture system on Microsoft Kinect v2 recordings: A caution for using the technologies together." PLoS ONE 13, no. 9: e0204052.
In this paper, the feasibility of using wearable wireless low-cost motion trackers equipped with magnetic/inertial sensors in daily human activities was investigated. Five previously introduced attitude estimation algorithms were chosen and implemented in Windows IoT environment. A Texas Instrument CC2650STK wireless sensor was utilized to capture the raw magnetic/inertial data. The raw data was streamed to a DragonBoard 410c single board computer in real-time via Bluetooth low energy with the low sampling frequency. The sensor attitude was estimated using the attitude estimation algorithms continuously. A Shimmer 3 AHRS system was used as a golden standard, and the orientation of the Shimmer 3 was acquired using the Shimmer Consensys PRO 1.5 software. The experimental test showed poor agreement between the estimated and reference orientations and that the calculated orientation was dependent on an initial calibration. Based on the preliminary results and the current limitations in the wearable motion trackers, we may conclude that a precise estimation of a rigid body angle may not be achieved using wearable motion trackers in daily activities and other clinical applications.
Mreza Naeemabadi; Birthe Dinesen; Samira Najafi; Mikkel Thogersen; John Hansen. Feasibility of employing AHRS algorithms in the real-time estimation of sensor orientation using low-cost and low sampling rate wearable sensors in IoT application. 2018 IEEE 8th International Conference on Consumer Electronics - Berlin (ICCE-Berlin) 2018, 1 -6.
AMA StyleMreza Naeemabadi, Birthe Dinesen, Samira Najafi, Mikkel Thogersen, John Hansen. Feasibility of employing AHRS algorithms in the real-time estimation of sensor orientation using low-cost and low sampling rate wearable sensors in IoT application. 2018 IEEE 8th International Conference on Consumer Electronics - Berlin (ICCE-Berlin). 2018; ():1-6.
Chicago/Turabian StyleMreza Naeemabadi; Birthe Dinesen; Samira Najafi; Mikkel Thogersen; John Hansen. 2018. "Feasibility of employing AHRS algorithms in the real-time estimation of sensor orientation using low-cost and low sampling rate wearable sensors in IoT application." 2018 IEEE 8th International Conference on Consumer Electronics - Berlin (ICCE-Berlin) , no. : 1-6.
Online telerehabilitation portals may be used as a tool in patient education and cardiac rehabilitation.
Camilla Melholt; Katrine Jønsson; Helle Spindler; John Hansen; Jan Jesper Andreasen; Gitte Nielsen; Astrid Noergaard; Anita Tracey; Charlotte Thorup; Rikke Kringelholt; Birthe Irene Dinesen. Cardiac patients’ experiences with a telerehabilitation web portal: Implications for eHealth literacy. Patient Education and Counseling 2018, 101, 854 -861.
AMA StyleCamilla Melholt, Katrine Jønsson, Helle Spindler, John Hansen, Jan Jesper Andreasen, Gitte Nielsen, Astrid Noergaard, Anita Tracey, Charlotte Thorup, Rikke Kringelholt, Birthe Irene Dinesen. Cardiac patients’ experiences with a telerehabilitation web portal: Implications for eHealth literacy. Patient Education and Counseling. 2018; 101 (5):854-861.
Chicago/Turabian StyleCamilla Melholt; Katrine Jønsson; Helle Spindler; John Hansen; Jan Jesper Andreasen; Gitte Nielsen; Astrid Noergaard; Anita Tracey; Charlotte Thorup; Rikke Kringelholt; Birthe Irene Dinesen. 2018. "Cardiac patients’ experiences with a telerehabilitation web portal: Implications for eHealth literacy." Patient Education and Counseling 101, no. 5: 854-861.
The purpose of the present study was to assess changes in body perception when visual feedback was removed from the hand and arm with the purpose of resembling the visual deprivation arising from amputation. The illusion was created by removing the visual feedback from the participants’ own left forearm using a mixed reality (MR) and green screen environment. Thirty healthy persons (15 female) participated in the study. Each subject experienced two MR conditions, one with and one without visual feedback from the left hand, and a baseline condition with normal vision of the limb (no MR). Body perception was assessed using proprioceptive drift, questionnaires on body perception, and thermal sensitivity measures (cold, warm, heat pain and cold pain detection thresholds). The proprioceptive drift showed a significant shift of the tip of the index finger (p<0.001) towards the elbow in the illusion condition (mean drift: −3.71 cm). Self-report showed a significant decrease in ownership (p<0.001), shift in perceptual distortions, (e.g. “It feels as if my lower arm has become shorter”) (p=0.025), and changes in sensations of the hand (tingling, tickling) (p=0.025). A significant decrease was also observed in cold detection threshold (p<0.001), i.e. the detection threshold was cooler than for the control conditions. The proprioceptive drift together with the self-reported questionnaire showed that the participants felt a proximal retraction of their limb, resembling the telescoping experienced by phantom limb patients. The study highlights the influence of missing visual feedback and its possible contribution to phantom limb phenomena.
Mikkel Thøgersen; John Hansen; Lars Arendt-Nielsen; Herta Flor; Laura Petrini. Removing own-limb visual input using mixed reality (MR) produces a “telescoping” illusion in healthy individuals. Behavioural Brain Research 2018, 347, 263 -271.
AMA StyleMikkel Thøgersen, John Hansen, Lars Arendt-Nielsen, Herta Flor, Laura Petrini. Removing own-limb visual input using mixed reality (MR) produces a “telescoping” illusion in healthy individuals. Behavioural Brain Research. 2018; 347 ():263-271.
Chicago/Turabian StyleMikkel Thøgersen; John Hansen; Lars Arendt-Nielsen; Herta Flor; Laura Petrini. 2018. "Removing own-limb visual input using mixed reality (MR) produces a “telescoping” illusion in healthy individuals." Behavioural Brain Research 347, no. : 263-271.
Mreza Naeemabadi; Birthe Dinesen; Ole Kæseler Andersen; Samira Najafi; John Hansen. Evaluating Accuracy and Usability of Microsoft Kinect Sensors and Wearable Sensor for Tele Knee Rehabilitation after Knee Operation. Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies 2018, 128 -135.
AMA StyleMreza Naeemabadi, Birthe Dinesen, Ole Kæseler Andersen, Samira Najafi, John Hansen. Evaluating Accuracy and Usability of Microsoft Kinect Sensors and Wearable Sensor for Tele Knee Rehabilitation after Knee Operation. Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies. 2018; ():128-135.
Chicago/Turabian StyleMreza Naeemabadi; Birthe Dinesen; Ole Kæseler Andersen; Samira Najafi; John Hansen. 2018. "Evaluating Accuracy and Usability of Microsoft Kinect Sensors and Wearable Sensor for Tele Knee Rehabilitation after Knee Operation." Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies , no. : 128-135.
The deep breathing test (DB) and Valsalva maneuver (VM) are used to detect autonomic dysfunction. The VM induces sympathetically mediated changes in blood pressure (phase II late, phase IV, and recovery time) and both tests induce vagally mediated heart rate changes. There is limited information on effects of key variables, compliance with testing and the effects of non-compliance This study has twin goals of evaluating compliance with standard instructions and the effects of changes in key variables. We also evaluated the effect of position on the VM. Forty healthy males performed DB at air exchange volumes of 50, 80, and 100% of vital lung capacity (VLC). The VM was performed at 40 and 30mmHg expiratory pressure for 15 and 10s in sitting and supine position, respectively. Participants performed DB at lower volumes than intended and were not able to maintain 100% VLC for the duration of the test. The DB heart rate response decreased 6.3beats/min per liter below VLC. During the VM, subjects blew at lower pressures than instructed. The VM responses were significantly larger with longer expiration durations, higher expiratory pressures and when performed sitting. Performing the VM at 40mmHg for 10s in supine position increased the odds ratio of experiencing flat-top responses. The ability of subjects to strictly comply with methodological guidelines significantly improves results. Recording of both test parameters and ensuing results is suggested.
Thorsten Kamlarczyk Rasmussen; John Hansen; Phillip A. Low; Paola Sandroni; Wolfgang Singer; Troels Staehelin Jensen; Astrid Juhl Terkelsen. Autonomic function testing: Compliance and consequences. Autonomic Neuroscience 2017, 208, 150 -155.
AMA StyleThorsten Kamlarczyk Rasmussen, John Hansen, Phillip A. Low, Paola Sandroni, Wolfgang Singer, Troels Staehelin Jensen, Astrid Juhl Terkelsen. Autonomic function testing: Compliance and consequences. Autonomic Neuroscience. 2017; 208 ():150-155.
Chicago/Turabian StyleThorsten Kamlarczyk Rasmussen; John Hansen; Phillip A. Low; Paola Sandroni; Wolfgang Singer; Troels Staehelin Jensen; Astrid Juhl Terkelsen. 2017. "Autonomic function testing: Compliance and consequences." Autonomic Neuroscience 208, no. : 150-155.
Aims Visual feedback is hypothesized to play an important role in the phantom limb condition. In this study we attempt to create an illusory experimental model of phantom limb wherein this condition is simulated by removing the visual input from the upper limb in a group of intact participants. The aim of the study is to investigate the role of visual feedback on somatosensation, nociception and bodily-self perception. Methods Using a novel mixed reality (MR) system, the visual feedback of the left hand is removed in order to visually simulate a left hand amputation on 30 healthy participants (15 females). Using a within-subject design, three conditions are created: visual amputation condition (MR with no visual input); visual condition (MR with normal vision); and a baseline condition (no MR). Thermal detection and nociceptive thresholds using method of limits are measured. Proprioception of the visually amputated hand is investigated by probing the felt hand position on a proximal-distal axis from the body. Using a questionnaire the effects of the missing visual feedback on bodily self is assessed. Results There was a clear drift in proprioception of the left hand in the proximal direction between the control and visual amputation condition (p <0.001). A decrease in cold detection was also significant between the control and visual amputation condition (p < 0.001). Finally, questions on perceptual experiences indicated that the observed proprioceptive retraction of the visually amputated hand was also felt by the participants. Conclusions Missing visual feedback greatly influences the perception of the visually amputated arm underlining the importance of visual feedback. The observed proprioceptive retraction of the hand resembles the telescoping perceptions often reported by phantom limb patients. The novel method developed for this study, is a new tool to investigate the influence of visual feedback on the relationship of bodily-self and chronic pain.
Mikkel Thøgersen; John Hansen; Herta Flor; Lars Arendt-Nielsen; Laura Petrini. A novel method for investigating the importance of visual feedback on somatosensation and bodily-self perception. Scandinavian Journal of Pain 2017, 16, 185 -185.
AMA StyleMikkel Thøgersen, John Hansen, Herta Flor, Lars Arendt-Nielsen, Laura Petrini. A novel method for investigating the importance of visual feedback on somatosensation and bodily-self perception. Scandinavian Journal of Pain. 2017; 16 (1):185-185.
Chicago/Turabian StyleMikkel Thøgersen; John Hansen; Herta Flor; Lars Arendt-Nielsen; Laura Petrini. 2017. "A novel method for investigating the importance of visual feedback on somatosensation and bodily-self perception." Scandinavian Journal of Pain 16, no. 1: 185-185.
Background:Telemedicine may have the possibility to provide better access to healthcare delivery for the citizens. Telemedicine in arctic remote areas must be tailored according to the needs of the local population. Therefore, we need more knowledge about their needs and their view of telemedicine.Objective:The aim of this study has been to explore how citizens living in the Greenlandic settlements experience the possibilities and challenges of telemedicine when receiving healthcare delivery in everyday life.Materials and Methods:Case study design was chosen as the overall research design. Qualitative interviews (n = 14) were performed and participant observations (n = 80 h) carried out in the local healthcare center in the settlements and towns. A logbook was kept and updated each day during the field research in Greenland. Observations were made of activities in the settlements.Findings:Data collected on citizens' views about the possibilities of using telemedicine in Greenland revealed the following findings: Greenlandic citizens are positive toward telemedicine, and telemedicine can help facilitate improved access to healthcare for residents in these Greenlandic settlements. Regarding challenges in using telemedicine in Greenland, the geographical and cultural context hinders accessibility to the Greenlandic healthcare system, and telemedicine equipment is not sufficiently mobile.Conclusion:Greenlandic citizens are positive toward telemedicine and regard telemedicine as a facilitator for improved access for healthcare in the Greenlandic settlements. We have identified challenges, such as geographical and cultural context, that hinder accessibility to the Greenlandic healthcare system.
Lasse O. Nielsen; Hans J. Krebs; Nancy M. Albert; Nick Anderson; Sheryl Catz; Timothy M. Hale; John Hansen; Lise Hounsgaard; Tae Youn Kim; David Lindeman; Helle Spindler; James P. Marcin; Thomas Nesbitt; Heather M. Young; Birthe Dinesen. Telemedicine in Greenland: Citizens' Perspectives. Telemedicine and e-Health 2017, 23, 441 -447.
AMA StyleLasse O. Nielsen, Hans J. Krebs, Nancy M. Albert, Nick Anderson, Sheryl Catz, Timothy M. Hale, John Hansen, Lise Hounsgaard, Tae Youn Kim, David Lindeman, Helle Spindler, James P. Marcin, Thomas Nesbitt, Heather M. Young, Birthe Dinesen. Telemedicine in Greenland: Citizens' Perspectives. Telemedicine and e-Health. 2017; 23 (5):441-447.
Chicago/Turabian StyleLasse O. Nielsen; Hans J. Krebs; Nancy M. Albert; Nick Anderson; Sheryl Catz; Timothy M. Hale; John Hansen; Lise Hounsgaard; Tae Youn Kim; David Lindeman; Helle Spindler; James P. Marcin; Thomas Nesbitt; Heather M. Young; Birthe Dinesen. 2017. "Telemedicine in Greenland: Citizens' Perspectives." Telemedicine and e-Health 23, no. 5: 441-447.
Background Step counters have been used to observe activity and support physical activity, but there is limited evidence on their accuracy. Objective The purpose was to investigate the step accuracy of the Fitbit Zip (Zip) in healthy adults during treadmill walking and in patients with cardiac disease while hospitalised at home. Methods Twenty healthy adults aged 39±13.79 (mean ±SD) wore four Zips while walking on a treadmill at different speeds (1.7–6.1 km/hour), and 24 patients with cardiac disease (age 67±10.03) wore a Zip for 24 hours during hospitalisation and for 4 weeks thereafter at home. A Shimmer3 device was used as a criterion standard. Results At a treadmill speed of 3.6 km/hour, the relative error (±SD) for the Zips on the upper body was −0.02±0.67 on the right side and −0.09 (0.67) on the left side. For the Zips on the waist, this was 0.08±0.71 for the right side and -0.08 (0.47) on the left side. At a treadmill speed of 3.6 km/hour and higher, the average per cent of relative error was <3%. The 24-hour test for the hospitalised patients showed a relative error of −47.15±24.11 (interclass correlation coefficient (ICC): 0.60), and for the 24-hour test at home, the relative error was −27.51±28.78 (ICC: 0.87). Thus, none of the 24-hour tests had less than the expected 20% error. In time periods of evident walking during the 24 h test, the Zip had an average per cent relative error of <3% at 3.6 km/hour and higher speeds. Conclusions A speed of 3.6 km/hour or higher is required to expect acceptable accuracy in step measurement using a Zip, on a treadmill and in real life. Inaccuracies are directly related to slow speeds, which might be a problem for patients with cardiac disease who walk at a slow pace.
Charlotte Brun Thorup; Jan Jesper Andreasen; Erik Elgaard Sørensen; Mette Grønkjær; Birthe Irene Dinesen; John Hansen. Accuracy of a step counter during treadmill and daily life walking by healthy adults and patients with cardiac disease. BMJ Open 2017, 7, e011742 .
AMA StyleCharlotte Brun Thorup, Jan Jesper Andreasen, Erik Elgaard Sørensen, Mette Grønkjær, Birthe Irene Dinesen, John Hansen. Accuracy of a step counter during treadmill and daily life walking by healthy adults and patients with cardiac disease. BMJ Open. 2017; 7 (3):e011742.
Chicago/Turabian StyleCharlotte Brun Thorup; Jan Jesper Andreasen; Erik Elgaard Sørensen; Mette Grønkjær; Birthe Irene Dinesen; John Hansen. 2017. "Accuracy of a step counter during treadmill and daily life walking by healthy adults and patients with cardiac disease." BMJ Open 7, no. 3: e011742.
Objective To investigate if electrocardiogram (ECG) markers from routine preoperative ECGs can be used in combination with clinical data to predict new-onset postoperative atrial fibrillation (POAF) following cardiac surgery. Design Retrospective observational case-control study. Setting Single-center university hospital. Participants One hundred consecutive adult patients (50 POAF, 50 without POAF) who underwent coronary artery bypass grafting, valve surgery, or combinations. Interventions Retrospective review of medical records and registration of POAF. Measurements and Main Results Clinical data and demographics were retrieved from the Western Denmark Heart Registry and patient records. Paper tracings of preoperative ECGs were collected from patient records, and ECG measurements were read by two independent readers blinded to outcome. A subset of four clinical variables (age, gender, body mass index, and type of surgery) were selected to form a multivariate clinical prediction model for POAF and five ECG variables (QRS duration, PR interval, P-wave duration, left atrial enlargement, and left ventricular hypertrophy) were used in a multivariate ECG model. Adding ECG variables to the clinical prediction model significantly improved the area under the receiver operating characteristic curve from 0.54 to 0.67 (with cross-validation). The best predictive model for POAF was a combined clinical and ECG model with the following four variables: age, PR-interval, QRS duration, and left atrial enlargement. Conclusion ECG markers obtained from a routine preoperative ECG may be helpful in predicting new-onset POAF in patients undergoing cardiac surgery.
Jiwei Gu; Jan J. Andreasen; Jacob Melgaard; Søren Lundbye-Christensen; John Hansen; Erik B. Schmidt; Kristinn Thorsteinsson; Claus Graff. Preoperative Electrocardiogram Score for Predicting New-Onset Postoperative Atrial Fibrillation in Patients Undergoing Cardiac Surgery. Journal of Cardiothoracic and Vascular Anesthesia 2017, 31, 69 -76.
AMA StyleJiwei Gu, Jan J. Andreasen, Jacob Melgaard, Søren Lundbye-Christensen, John Hansen, Erik B. Schmidt, Kristinn Thorsteinsson, Claus Graff. Preoperative Electrocardiogram Score for Predicting New-Onset Postoperative Atrial Fibrillation in Patients Undergoing Cardiac Surgery. Journal of Cardiothoracic and Vascular Anesthesia. 2017; 31 (1):69-76.
Chicago/Turabian StyleJiwei Gu; Jan J. Andreasen; Jacob Melgaard; Søren Lundbye-Christensen; John Hansen; Erik B. Schmidt; Kristinn Thorsteinsson; Claus Graff. 2017. "Preoperative Electrocardiogram Score for Predicting New-Onset Postoperative Atrial Fibrillation in Patients Undergoing Cardiac Surgery." Journal of Cardiothoracic and Vascular Anesthesia 31, no. 1: 69-76.
Commercial self-monitoring devices are becoming increasingly popular, and over the last decade, the use of self-monitoring technology has spread widely in both consumer and medical markets. The purpose of this study was to evaluate five commercially available self-monitoring devices for further testing in clinical applications. Four activity trackers and one sleep tracker were evaluated based on step count validity and heart rate validity. Methods: The study enrolled 22 healthy volunteers in a walking test. Volunteers walked a 100 m track at 2 km/h and 3.5 km/h. Steps were measured by four activity trackers and compared to gyroscope readings. Two trackers were also tested on nine subjects by comparing pulse readings to Holter monitoring. Results: The lowest average systematic error in the walking tests was −0.2%, recorded on the Garmin Vivofit 2 at 3.5 km/h; the highest error was the Fitbit Charge HR at 2 km/h with an error margin of 26.8%. Comparisons of pulse measurements from the Fitbit Charge HR revealed a margin error of −3.42% ± 7.99% compared to the electrocardiogram. The Beddit sleep tracker measured a systematic error of −3.27% ± 4.60%. Conclusion: The measured results revealed the current functionality and limitations of the five self-tracking devices, and point towards a need for future research in this area.
Soren Leth; John Hansen; Olav W. Nielsen; Birthe Dinesen. Evaluation of Commercial Self-Monitoring Devices for Clinical Purposes: Results from the Future Patient Trial, Phase I. Sensors 2017, 17, 211 .
AMA StyleSoren Leth, John Hansen, Olav W. Nielsen, Birthe Dinesen. Evaluation of Commercial Self-Monitoring Devices for Clinical Purposes: Results from the Future Patient Trial, Phase I. Sensors. 2017; 17 (12):211.
Chicago/Turabian StyleSoren Leth; John Hansen; Olav W. Nielsen; Birthe Dinesen. 2017. "Evaluation of Commercial Self-Monitoring Devices for Clinical Purposes: Results from the Future Patient Trial, Phase I." Sensors 17, no. 12: 211.