Concussion in Adolescents Impairs Heart Rate Response to Brief Handgrip Exercise.

Autor:	Woehrle E; School of Kinesiology, Western University, London, Ontario, Canada., Harriss AB; School of Kinesiology, Western University, London, Ontario, Canada.; School of Physical Therapy, Western University, London, Ontario, Canada., Abbott KC; School of Kinesiology, Western University, London, Ontario, Canada., Moir ME; School of Kinesiology, Western University, London, Ontario, Canada., Balestrini CS; School of Kinesiology, Western University, London, Ontario, Canada.; Schulich School of Medicine, Western University, London, Ontario, Canada., Fischer LK; Fowler Kennedy Sport Medicine Clinic, London, Ontario, Canada., Fraser DD; Children's Health Research Institute, London, Ontario, Canada; and., Shoemaker JK; School of Kinesiology, Western University, London, Ontario, Canada.; Department of Physiology and Pharmacology, Western University, London, Ontario, Canada.
Jazyk:	angličtina
Zdroj:	Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine [Clin J Sport Med] 2020 Sep; Vol. 30 (5), pp. e130-e133.
DOI:	10.1097/JSM.0000000000000635
Abstrakt:	Objective: Test the hypotheses that (1) concussion in adolescents impairs autonomic neural control of heart rate (HR), and (2) HR reactivity improves with symptom resolution. Design: Observational, case-control. Participants: Nineteen concussed adolescents (8 female adolescents; age 15 ± 2 years) and 16 healthy controls (6 female adolescents, age 15 ± 2 years). Intervention: All participants performed an isometric handgrip (IHG) at 30% maximum voluntary contraction lasting 30 seconds. Heart rate (electrocardiogram) and hemodynamic responses (photoplethysmographic Finometer) were recorded from 30 seconds of baseline and the last 10 seconds of handgrip. Main Outcome Measures: The HR response (ΔHR) at the onset of moderate-intensity IHG using a mixed 1-way analysis of variance. Results: A group × time interaction (P < 0.005) indicated that handgrip evoked a greater ΔHR among control participants (13 ± 10 beats/min) compared with concussed (6.4 ± 6.3 beats/min; group P = 0.63; time P < 0.001; d = 0.77). Conclusion: These preliminary results suggest that a concussion impairs the ability to elevate HR at the exercise onset and, given the nature of the task, this could be interpreted to reflect reduced ability to withdraw cardiovagal control. Therefore, the data support the hypothesis of neural cardiac dysregulation in adolescents diagnosed with concussion. Clinical Relevance: The IHG test could aid concussion diagnosis and support return-to-play decisions.
Databáze:	MEDLINE
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