Karin Nijhof

Prof. Dr. Karin Nijhof


Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

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

Representative Publications

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16 April 2021 in Stress
Verified
Journal Article
Open access
ASAngela A. T. Schuurmans
Angela A. T. Schuurmans
Karin NijhofKarin Nijhof
Karin Nijhof
MCMaaike Cima
Maaike Cima
RSRon Scholte
Ron Scholte
APA. Popma
A. Popma
RORoy Otten
Roy Otten
Alterations in neurobiological stress systems such as the autonomic nervous system (ANS) and hypothalamic-pituitary-adrenal (HPA) axis contribute to the development and maintenance of psychological and behavioral problems after traumatic experiences. Investigating neurobiological parameters and how these relate to each other may provide insight into the complex mechanisms at play. Whereas the preponderance of studies focuses on either the ANS or the HPA axis separately, the current study is the first to evaluate relations between posttraumatic stress and both basal activity during rest and stress reactivity of the ANS as well as the HPA axis in a sample of traumatized adolescents and healthy controls. The traumatized sample (n = 77), based on clinical levels of posttraumatic stress, was a convenience sample that was recruited within residential institutions, was compared to a healthy control sample (n = 48) recruited within the general community. For the ANS, we expected increased SNS and decreased PNS activity during rest and increased SNS and decreased PNS reactivity to social stress among traumatized adolescents compared to healthy controls. Regarding the HPA axis, we expected increased basal cortisol levels and decreased cortisol reactivity to stress in the traumatized sample. Compared to healthy controls, traumatized adolescents exhibited significantly higher sympathetic and lower parasympathetic activation during rest and increased sympathetic reactivity to acute stress (ANS parameters). Outcomes on the HPA axis (i.e. cortisol) indicated that traumatized adolescents showed increased cortisol levels during rest and blunted cortisol reactivity to acute stress. Implications for clinical relevance and trauma-focused treatment purposes are discussed.

23 September 2020 in JMIR Research Protocols
Verified
Journal Article
Open access
ASAngela A T Schuurmans
Angela A T Schuurmans
Karin NijhofKarin Nijhof
Karin Nijhof
RSRon Scholte
Ron Scholte
APA. Popma
A. Popma
RORoy Otten
Roy Otten
Background: Many adolescents in residential care have been exposed to prolonged traumatic experiences such as violence, neglect, or abuse. Consequently, they suffer from posttraumatic stress. This not only negatively affects psychological and behavioral outcomes (eg, increased anxiety, depression, and aggression) but also has adverse effects on physiological outcomes, in particular on their neurobiological stress systems. Although current evidence-based treatment options are effective, they have their limitations. An alternative to traditional trauma treatment is meditation-based treatment that focuses on stress regulation and relaxation. Muse is a game-based meditation intervention that makes use of adolescents’ intrinsic motivation. The neurofeedback element reinforces relaxation abilities. Objective: This paper describes the protocol for a randomized controlled trial in which the goal is to examine the effectiveness of Muse (InteraXon Inc) in reducing posttraumatic stress and normalizing neurobiological stress systems in a sample of traumatized adolescents in residential care. Methods: This will be a multicenter, multi-informant, and multimethod randomized controlled trial. Participants will be adolescents (N=80), aged 10 to 18 years, with clinical levels of posttraumatic symptoms, who are randomized to receive either the Muse therapy sessions and treatment as usual (intervention) or treatment as usual alone (control). Data will be collected at 3 measurement instances: pretest (T1), posttest (T2), and at 2-month follow-up. Primary outcomes will be posttraumatic symptoms (self-report and mentor report) and stress (self-report) at posttest. Secondary outcomes will be neurobiological stress parameters under both resting and acute stress conditions, and anxiety, depression, and aggression at posttest. Secondary outcomes also include all measures at 2-month follow-up: posttraumatic symptoms, stress, anxiety, depression aggression, and neurobiological resting parameters. Results: The medical-ethical committee Arnhem-Nijmegen (NL58674.091.16) approved the trial on November 15, 2017. The study was registered on December 2, 2017. Participant enrollment started in January 2018, and the results of the study are expected to be published in spring or summer 2021. Conclusions: Study results will demonstrate whether game-based meditation therapy improves posttraumatic stress and neurobiological stress systems, and whether it is more effective than treatment as usual alone for traumatized adolescents. Trial Registration: Netherlands Trial Register NL6689 (NTR6859); https://www.trialregister.nl/trial/6689 International Registered Report Identifier (IRRID): DERR1-10.2196/19881

21 July 2015 in BMC Psychiatry
Verified
Journal Article
Open access
PDF file
MWMartine M. Weeland
Martine M. Weeland
Karin NijhofKarin Nijhof
Karin Nijhof
IVIgnace Vermaes
Ignace Vermaes
RERutger C. M. E. Engels
Rutger C. M. E. Engels
JBJan K. Buitelaar
Jan K. Buitelaar
Although adolescents are often referred to residential treatment centres because of severe externalizing behaviours, a vast majority demonstrated comorbid symptoms of depression and anxiety. Covert internalizing symptoms in these adolescents might be easily unrecognized and therefore untreated. Adolescents with mild intellectual disability (MID) are overrepresented among youth with both externalizing and internalizing problems. There are yet few treatment programs available for adolescents with both externalizing and internalizing problems. The CBT-based resiliency program, Op Volle Kracht (OVK), which is based on the US Penn Resiliency Program (PRP), was adapted to suit the needs of adolescents with both externalizing and internalizing problems, either with or without MID, in Dutch residential treatment centres. The effectiveness of this group intervention program of eight sessions will be tested in a randomised controlled trial (RCT) with N = 182 adolescents aged 12–16, allocated to either the target intervention plus treatment as usual (OVK + TAU) or treatment as usual only (TAU). The main outcome variables include depressive symptoms (primary), anxiety, behavioural problems, and group therapeutic climate. Cognitive styles and coping styles will be included as possible mediators. Assessments take place at baseline (T1), one week before the start of the program (T2), immediately after the program (T3), and at three months follow-up (T4). The program assets include its wide implementation possibilities due to low costs, the short duration of the program and the delivery by group care workers, and its suitability for adolescents with MID. Further strengths of the present study design include its robust method (RCT), the ecological validity, and the inclusion of possible mediators of treatment effect. The program emphasizes individual risk factors for depression rather than social and family factors. Implications for practice and future research are discussed. Dutch Trial Register NTR4836

15 April 2020 in Kind en adolescent
Verified
Journal Article
Closed access
PDF file
Karin NijhofKarin Nijhof
Karin Nijhof
LLLydia Laninga-Wijnen
Lydia Laninga-Wijnen
EMEva Mulder
Eva Mulder
LDLieke van Domburgh
Lieke van Domburgh
APA. Popma
A. Popma
CKCarolien Konijn
Carolien Konijn

2 October 2017 in Residential Treatment For Children & Youth
Verified
Journal Article
Closed access
Karin NijhofKarin Nijhof
Karin Nijhof
LDLieke van Domburgh
Lieke van Domburgh
ESEefje Strijbosch
Eefje Strijbosch
ALAlona Labun
Alona Labun
MDMarc Delsing
Marc Delsing
IVIgnace P. R. Vermaes
Ignace P. R. Vermaes
This study examines the external validity of a nationwide dataset, considering the fact that clients can refuse the extraction of their clinical information to aggregate datasets. Data of 949 youths (56% boys, mean age 15.6 years, SD = 1.49) from six Dutch residential institutions were included. An individual-variables and a person-oriented approach were applied to examine the extent to which the group giving permission to the use of their data for aggregate purposes (66%) is representative for the total population in secure residential youth care. Both static, non-changeable client information as well as dynamic, changeable client information were gathered. Youths who assented to the use of their information were overrepresented amongst the population of some of the participating institutions, and were more often Caucasian. Three start profiles based on the dynamic variables were distinguished. Youths who assent were overrepresented in the most problematic profile, whereas youth who did not assent were overrepresented in the least problematic profile. To improve the external validity and the value of the monitor, it is important to achieve more uniformity between institutions as far as the procedures are concerned, and to find creative ways to increase the assent levels, particularly among ethnic minorities.

5 May 2020 in JMIR Preprints
Verified
Preprint
Open access
ASAngela A T Schuurmans
Angela A T Schuurmans
Karin NijhofKarin Nijhof
Karin Nijhof
RSRon Scholte
Ron Scholte
APA. Popma
A. Popma
RORoy Otten
Roy Otten
BACKGROUND Many adolescents in residential care have been exposed to prolonged traumatic experiences such as violence, neglect, or abuse. Consequently, they suffer from posttraumatic stress. This not only negatively affects psychological and behavioral outcomes (eg, increased anxiety, depression, and aggression) but also has adverse effects on physiological outcomes, in particular on their neurobiological stress systems. Although current evidence-based treatment options are effective, they have their limitations. An alternative to traditional trauma treatment is meditation-based treatment that focuses on stress regulation and relaxation. Muse is a game-based meditation intervention that makes use of adolescents’ intrinsic motivation. The neurofeedback element reinforces relaxation abilities. OBJECTIVE This paper describes the protocol for a randomized controlled trial in which the goal is to examine the effectiveness of Muse (InteraXon Inc) in reducing posttraumatic stress and normalizing neurobiological stress systems in a sample of traumatized adolescents in residential care. METHODS This will be a multicenter, multi-informant, and multimethod randomized controlled trial. Participants will be adolescents (N=80), aged 10 to 18 years, with clinical levels of posttraumatic symptoms, who are randomized to receive either the Muse therapy sessions and treatment as usual (intervention) or treatment as usual alone (control). Data will be collected at 3 measurement instances: pretest (T1), posttest (T2), and at 2-month follow-up. Primary outcomes will be posttraumatic symptoms (self-report and mentor report) and stress (self-report) at posttest. Secondary outcomes will be neurobiological stress parameters under both resting and acute stress conditions, and anxiety, depression, and aggression at posttest. Secondary outcomes also include all measures at 2-month follow-up: posttraumatic symptoms, stress, anxiety, depression aggression, and neurobiological resting parameters. RESULTS The medical-ethical committee Arnhem-Nijmegen (NL58674.091.16) approved the trial on November 15, 2017. The study was registered on December 2, 2017. Participant enrollment started in January 2018, and the results of the study are expected to be published in spring or summer 2021. CONCLUSIONS Study results will demonstrate whether game-based meditation therapy improves posttraumatic stress and neurobiological stress systems, and whether it is more effective than treatment as usual alone for traumatized adolescents. CLINICALTRIAL Netherlands Trial Register NL6689 (NTR6859); https://www.trialregister.nl/trial/6689 INTERNATIONAL REGISTERED REPORT DERR1-10.2196/19881