Ruud Knols

Dr. Ruud Knols


Research Focus & Metrics

Academic Career Length

22Years (2005-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 June 2005 in Journal of Clinical Oncology
Verified
Journal Article
Closed access
RKRuud Knols
Ruud Knols
NANeil K. Aaronson
Neil K. Aaronson
DUDaniel Uebelhart
Daniel Uebelhart
JFJaap Fransen
Jaap Fransen
GAGeert Aufdemkampe
Geert Aufdemkampe
Purpose: To systematically review the methodologic quality of, and summarize the evidence from trials examining the effectiveness of physical exercise in improving the level of physical functioning and psychological well-being of cancer patients during and after medical treatment. Methods: Thirty-four randomized clinical trials (RCTs) and controlled clinical trials were identified, reviewed for substantive results, and assessed for methodologic quality. Results: Four of 34 trials met all (seven of seven) methodologic criteria on the Delphi criteria list. Failure to conceal the sequencing of treatment allocation before patient recruitment, failure to blind the outcome assessor, and failure to employ an intention-to-treat analysis strategy were the most prevalent methodologic shortcomings. Various exercise modalities have been applied, differing in content, frequency, intensity, and duration. Positive results have been observed for a diverse set of outcomes, including physiologic measures, objective performance indicators, self-reported functioning and symptoms, psychological well-being, and overall health-related quality of life. Conclusion: The trials reviewed were of moderate methodologic quality. Together they suggest that cancer patients may benefit from physical exercise both during and after treatment. However, the specific beneficial effects of physical exercise may vary as a function of the stage of disease, the nature of the medical treatment, and the current lifestyle of the patient. Future RCTs should use larger samples, use appropriate comparison groups to rule out the possibility of an attention-placebo effect, use a comparable set of outcome measures, pay greater attention to issues of motivation and adherence of patients participating in exercise programs, and examine the effect of exercise on cancer survival.

22 June 2012 in BMC Neurology
Verified
Journal Article
Open access
PDF file
OSOliver Stoller
Oliver Stoller
EBEling D. de Bruin
Eling D. de Bruin
RKRuud Knols
Ruud Knols
KHKenneth J Hunt
Kenneth J Hunt
Background: Previous studies have shown the beneficial effects of aerobic exercise in chronic stroke. Most motor and functional recovery occurs in the first months after stroke. Improving cardiovascular capacity may have potential to precipitate recovery during early stroke rehabilitation. Currently, little is known about the effects of early cardiovascular exercise in stroke survivors. The aim of this systematic review was to evaluate the effectiveness of cardiovascular exercise early after stroke. Methods: A systematic literature search was performed. For this review, randomized and non-randomized prospective controlled cohort studies using a cardiovascular, cardiopulmonary or aerobic training intervention starting within 6 months post stroke were considered. The PEDro scale was used to detect risk of bias in individual studies. Inter-rater agreement was calculated (kappa). Meta-analysis was performed using a random-effects model. Results: A total of 11 trials were identified for inclusion. Inter-rater agreement was considered to be “very good” (Kappa: 0.81, Standard Error: 0.06, CI95%: 0.70–0.92), and the methodological quality was “good” (7 studies) to “fair” (4 studies). Peak oxygen uptake data were available for 155 participants. Pooled analysis yielded homogenous effects favouring the intervention group (standardised mean difference (SMD) = 0.83, CI95% = 0.50–1.16, Z = 4.93, P < 0.01). Walking endurance assessed with the 6 Minute Walk Test comprised 278 participants. Pooled analysis revealed homogenous effects favouring the cardiovascular training intervention group (SMD = 0.69, CI95% = 0.45–0.94, Z = 5.58, P < 0.01). Gait speed, measured in 243 participants, did not show significant results (SMD = 0.51, CI95% = −0.25–1.26, Z = 1.31, P = 0.19) in favour of early cardiovascular exercise. Conclusion: This meta-analysis shows that stroke survivors may benefit from cardiovascular exercise during sub-acute stages to improve peak oxygen uptake and walking distance. Thus, cardiovascular exercise should be considered in sub-acute stroke rehabilitation. However, concepts to influence and evaluate aerobic capacity in severely affected individuals with sub-acute stroke, as well as in the very early period after stroke, are lacking. Further research is needed to develop appropriate methods for cardiovascular rehabilitation early after stroke and to evaluate long-term effects of cardiovascular exercise on aerobic capacity, physical functioning, and quality-of-life.

6 December 2010 in Bone Marrow Transplantation
Verified
Journal Article
Closed access
RKRuud Knols
Ruud Knols
EBEling D. de Bruin
Eling D. de Bruin
DUD Uebelhart
D Uebelhart
GAG Aufdemkampe
G Aufdemkampe
USU Schanz
U Schanz
NAN K Aaronson
N K Aaronson

8 October 2010 in Sensors
Verified
Journal Article
Open access
PDF file
LALara Allet
Lara Allet
RKRuud Knols
Ruud Knols
KSKei Shirato
Kei Shirato
EBEling D. de Bruin
Eling D. de Bruin
The use of wearable motion sensing technology offers important advantages over conventional methods for obtaining measures of physical activity and/or physical functioning in individuals with chronic diseases. This review aims to identify the actual state of applying wearable systems for monitoring mobility-related activity in individuals with chronic disease conditions. In this review we focus on technologies and applications, feasibility and adherence aspects, and clinical relevance of wearable motion sensing technology. PubMed (Medline since 1990), PEdro, and reference lists of all relevant articles were searched. Two authors independently reviewed randomised trials systematically. The quality of selected articles was scored and study results were summarised and discussed. 163 abstracts were considered. After application of inclusion criteria and full text reading, 25 articles were taken into account in a full text review. Twelve of these papers evaluated walking with pedometers, seven used uniaxial accelerometers to assess physical activity, six used multiaxial accelerometers, and two papers used a combination approach of a pedometer and a multiaxial accelerometer for obtaining overall activity and energy expenditure measures. Seven studies mentioned feasibility and/or adherence aspects. The number of studies that use movement sensors for monitoring of activity patterns in chronic disease (postural transitions, time spent in certain positions or activities) is nonexistent on the RCT level of study design. Although feasible methods for monitoring human mobility are available, evidence-based clinical applications of these methods in individuals with chronic diseases are in need of further development.

22 August 2014 in BMC Neurology
Verified
Journal Article
Open access
PDF file
BABernadette C Ammann
Bernadette C Ammann
RKRuud Knols
Ruud Knols
PPPierrette Baschung Pfister
Pierrette Baschung Pfister
RBRob A de Bie
Rob A de Bie
EBEling D. de Bruin
Eling D. de Bruin
There is increasing evidence for the beneficial effects of exercise training in stroke survivors. In order to reach the desired training effects, exercise training principles must be considered as this ensures the prescription of adequate exercises at an adequate dose. Moreover, exercise training interventions must be designed in a way that maximizes patients’ adherence to the prescribed exercise regimen. The objectives of this systematic review were (1) to investigate whether training principles for physical exercise interventions are reported in RCTs for sub-acute and chronic stroke survivors, (2) to evaluate whether the RCTs reported the prescription of the FITT components of the exercise interventions as well as (3) patients’ adherence to this prescription, and (4) to assess the risk of bias of the included studies.

9 March 2009 in BMC Musculoskeletal Disorders
Verified
Journal Article
Open access
PDF file
RKRuud Knols
Ruud Knols
GAGeert Aufdemkampe
Geert Aufdemkampe
EBEling D. de Bruin
Eling D. de Bruin
DUDaniel Uebelhart
Daniel Uebelhart
NAN.K. Aaronson
N.K. Aaronson
Hand-held dynamometry is a portable and inexpensive method to quantify muscle strength. To determine if muscle strength has changed, an examiner must know what part of the difference between a patient's pre-treatment and post-treatment measurements is attributable to real change, and what part is due to measurement error. This study aimed to determine the relative and absolute reliability of intra and inter-observer strength measurements with a hand-held dynamometer (HHD).