Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz

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Simpson, CWC; Walter, J; Gieseg, SP; Lackner, S; Holasek, S; Hamlin, MJ.
Central and peripheral nervous system activity and muscle oxygenation in athletes during repeated-sprint exercise in normoxia and normobaric hypoxia.
J Sports Sci. 2025; 1-13. Doi: 10.1080/02640414.2025.2461947
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Co-Autor*innen der Med Uni Graz: Holasek Sandra Johanna; Lackner Sonja; Meissel Julia
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Abstract:: AIM: To investigate central and peripheral nervous system activity and muscle oxygenation in athletes during repeated-sprint exercise in normoxia and normobaric hypoxia. METHODS: The effects on vastus lateralis muscle strength in a cross-over study were examined in 18 athletes (13 males, 5 females) completing 10 × 6-s cycle sprints. Immediately after and again 5 minutes post-exercise, electromyography (EMG), heart rate variability, maximal voluntary contraction (MVC), muscle oxygenation, peak power output, and arterial oxygen saturation were compared to 2 baseline sets named ("Baseline" and "Pre"). RESULTS: Post-exercise MVC was significantly lower (6.7 ± 10.0%) than Baseline, but root-mean-square amplitude during hypoxia (all-times) was significantly lower than normoxia (0.38 ± 0.19 vs 0.41 ± 0.17 mV). Comparative frequency analysis of the percentage change in pre- to post-exercise EMG area, at low 1-29 hz (type-1 fibre) and high 75-100 hz (type-2 fibre) areas, revealed a significant reduction in type-1 fibre activity relative to type-2, by 20-30% across time and by 10% in type-1 activity between conditions. CONCLUSION: Exercise in hypoxia appeared to cause a temporary increase in central sympathetic nervous system activity and greater recruitment of type-2 muscle fibres, with accompanying reduction in type-1. Acute hypoxia may stimulate type-2 fibre conditioning.
Find related publications in this database (Keywords): Hypoxia; repeated-sprint exercise; command control; EMG; NIRS