Sven P. Hoekstra

Dr. Sven P. Hoekstra


Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

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

Representative Publications

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1 July 2021 in Applied Physiology, Nutrition, and Metabolism
Verified
Journal Article
Closed access
SHSven P. Hoekstra
Sven P. Hoekstra
TOTakahiro Ogawa
Takahiro Ogawa
MSMiguel Dos Santos
Miguel Dos Santos
GHGreg Handsley
Greg Handsley
SBStephen Bailey
Stephen Bailey
CLChristof Leicht
Christof Leicht
The aim of this study was to compare the acute cardiometabolic and perceptual responses between local and whole-body passive heating. Using a water-perfused suit, 10 recreationally active males underwent three 90 min conditions: heating of the legs with upper-body cooling (LBH), whole-body heating (WBH) and exposure to a thermoneutral temperature (CON). Blood samples were collected before and up to 3 h post-session to assess inflammatory markers, while a 2 h oral glucose tolerance test was initiated 1 h post-session. Femoral artery blood flow and perceptual responses were recorded at regular intervals. The interleukin (IL)-6 incremental area under the curve (iAUC) was higher for LBH (1096 ± 851 pg/mL × 270 min) and WBH (833 ± 476 pg/mL × 270 min) compared with CON (565 ± 325 pg/mL × 270 min; p < 0.047). Glucose concentrations were higher after WBH compared with LBH and CON (p < 0.046). Femoral artery blood flow was higher at the end of WBH (1713 ± 409 mL/min) compared with LBH (943 ± 349 mL/min; p < 0.001), and higher in LBH than CON (661 ± 222 mL/min; p = 0.002). Affect and thermal comfort were more negative during WBH compared with LBH and CON (p < 0.010). In conclusion, local passive heating elevated blood flow and the IL-6 iAUC. However, while resulting in more positive perceptual responses, the majority of the included cardiometabolic markers were attenuated compared with WBH. Novelty: The increase in the IL-6 iAUC in response to passive heating is not reduced by upper-body cooling. Upper-body cooling attenuates the plasma nitrite, IL-1ra and femoral artery blood flow response to passive heating. Upper-body cooling leads to more positive perceptual responses to passive heating.


1 December 2021 in Appetite
Verified
Journal Article
Closed access
JFJordan M. Fenton
Jordan M. Fenton
James KingJames King
James King
SHSven P. Hoekstra
Sven P. Hoekstra
SWScott A. Willis
Scott A. Willis
TOTakahiro Ogawa
Takahiro Ogawa
VVicky Tolfrey
Vicky Tolfrey

SGSonja De Groot
Sonja De Groot
FEFrank W. L. Ettema
Frank W. L. Ettema
CLChristel M. C. van Leeuwen
Christel M. C. van Leeuwen
WAWendy J. Achterberg
Wendy J. Achterberg
TJThomas W. J. Janssen
Thomas W. J. Janssen
SHSven P. Hoekstra
Sven P. Hoekstra
This study investigated the feasibility and efficacy of mindset and breathing exercises (Wim Hof Method (WHM)) on physical and mental health in persons with spinal cord injury (SCI). Ten individuals with SCI participated in this pilot study. These ten participants followed a 4-week WHM intervention, with one weekly group session in the rehabilitation center and daily practice at home using the WHM app. An in-person exit-interview was conducted post-intervention to collect qualitative information on participants’ experiences, regarding the feasibility and effects of the intervention. Furthermore, tests and questionnaires were administered pre- and post-intervention to assess physical and mental health outcomes. Adherence to the weekly in-person meetings was excellent and no adverse events occurred. Physical and mental health outcomes in this small sample size showed some pre–post differences. This pilot feasibility study provides preliminary evidence supporting the feasibility and efficacy of the WHM, including mindset and breathing exercises, on physical and mental health of people with SCI. These results warrant a randomized-controlled trial, including cold exposure, of this novel intervention in people with SCI.

17 May 2022 in American Journal of Physical Medicine & Rehabilitation
Verified
Journal Article
Open access
SGSonja De Groot
Sonja De Groot
IKIngrid Kouwijzer
Ingrid Kouwijzer
SHSven P. Hoekstra
Sven P. Hoekstra
GVGuido Vroemen
Guido Vroemen
LVLinda J.M. Ot Valent
Linda J.M. Ot Valent
LWLucas H.V. van der Woude
Lucas H.V. van der Woude
Objectives: The aims of the study were to evaluate the external and internal work load of trained handcyclists during a mountain time trial, to compare the results with a world-class handcyclist, and to identify time trial performance determinants. Design: Ten trained and one world-class handcyclists performed a graded exercise test to determine power output and heart rate at the (first and second) ventilatory thresholds and exhaustion. Power output and heart rate were continuously measured during the race. Results: The mean absolute power output during the race (119 ± 21 vs. 203 W, P < 0.001) was lower in the trained handcyclists compared with the world-class handcyclist. The absolute and relative heart rate during the race (86 ± 7% vs. 88%, P = 0.40) and relative power output during the race (66 ± 10% vs. 62%, P = 0.24) were similar. Trained handcyclists cycled significantly less time at a power output between first and second ventilatory thresholds (48% vs. 64%, P = 0.02) and more at a power output greater than second ventilatory threshold (34% vs. 11%, P = 0.005). Power output at the second ventilatory threshold showed the strongest correlation with finish time (r = −0.78) and peak power output with mean power output of the race (r = 0.90). Conclusions: The laboratory outcome peak power output and power output at the second ventilatory threshold are important performance determinants for longer time trials in handcyclists, and it is, therefore, important to improve these outcomes with training. Because the trained handcyclists cycled most of the race in intensity zones 2 and 3, it is recommended to incorporate these zones also in the training.

18 July 2019 in Frontiers for Young Minds
Verified
Journal Article
Open access
SHSven P. Hoekstra
Sven P. Hoekstra
CLChristof Leicht
Christof Leicht
We all know that playing sports like football, tennis, or hockey with friends can be really good fun. Even better, it also helps us to stay healthy. But what if you cannot do exercise because your body does not allow you to? For example, some people with disabilities cannot use their legs and older people are sometimes not strong enough to exercise. For these people, it would be great if there was another activity that could keep them healthy. Since part of the healthy effects of exercise may come from the fact that your body temperature increases when you are running around, getting warm without doing any exercise may also improve people's health. In this study, we investigated whether getting warm by sitting in a hot bath can improve health. We would recommend reading this article while sitting in a bath…