European journal of applied physiology · 2025
Vascular function responses to resistance exercise followed by intermittent hypoxic exposure in untrained males.
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Mitranun Witid, Namboonlue Chaiyawat, Muangritdech Nattha, Paditsaeree Kampanart
Аннотация
PURPOSE: This study investigated whether intermittent hypoxic exposure following resistance exercise mitigates acute vascular dysfunction. The main objective was to assess the effects of post-exercise hypoxia on flow-mediated dilation (FMD), blood pressure, and brachial-ankle pulse wave velocity (baPWV) in untrained males.
METHODS: Thirteen untrained male university students (age: 20.46 ± 0.87 years; body mass index: 23.6 ± 0.67 kg/m2) participated in a crossover trial involving three experimental conditions: (1) resistance exercise followed by normoxia (RE, FIO2 = 21%), (2) resistance exercise followed by intermittent hypoxia (RE-H1, alternating FIO2 = 13.6% and 21%), and (3) resistance exercise followed by mild intermittent hypoxia (RE-H2, alternating FIO2 = 15.8% and 21%). Participants performed five sets of 10 leg extensions at 70% of their one-repetition maximum. FMD, blood pressure, and baPWV were measured at baseline and 0, 10, 20, 30, and 60 min post-exercise.
RESULTS: Post-exercise systolic blood pressure decreased in all conditions (p < 0.05), with no significant differences between conditions, while diastolic blood pressure showed no significant changes (p > 0.05). baPWV decreased in RE and RE-H2 (p < 0.05) but not in RE-H1, with RE showing greater reductions than RE-H1 (p < 0.05). Blood flow and shear rates increased in all conditions (p < 0.05), with greater responses in RE-H1 and RE-H2 (p < 0.05). FMD decreased after RE (p < 0.05) but was maintained in RE-H1 and RE-H2 for 60 min post-exercise. The %FMD/Δ shear rate remained consistently higher in RE-H1 and RE-H2 than in RE throughout the post-exercise period (p < 0.05).
CONCLUSION: Intermittent hypoxia following resistance exercise appears to preserve endothelial function and prevent transient vascular impairment, suggesting its potential as a recovery-enhancing strategy.
METHODS: Thirteen untrained male university students (age: 20.46 ± 0.87 years; body mass index: 23.6 ± 0.67 kg/m2) participated in a crossover trial involving three experimental conditions: (1) resistance exercise followed by normoxia (RE, FIO2 = 21%), (2) resistance exercise followed by intermittent hypoxia (RE-H1, alternating FIO2 = 13.6% and 21%), and (3) resistance exercise followed by mild intermittent hypoxia (RE-H2, alternating FIO2 = 15.8% and 21%). Participants performed five sets of 10 leg extensions at 70% of their one-repetition maximum. FMD, blood pressure, and baPWV were measured at baseline and 0, 10, 20, 30, and 60 min post-exercise.
RESULTS: Post-exercise systolic blood pressure decreased in all conditions (p < 0.05), with no significant differences between conditions, while diastolic blood pressure showed no significant changes (p > 0.05). baPWV decreased in RE and RE-H2 (p < 0.05) but not in RE-H1, with RE showing greater reductions than RE-H1 (p < 0.05). Blood flow and shear rates increased in all conditions (p < 0.05), with greater responses in RE-H1 and RE-H2 (p < 0.05). FMD decreased after RE (p < 0.05) but was maintained in RE-H1 and RE-H2 for 60 min post-exercise. The %FMD/Δ shear rate remained consistently higher in RE-H1 and RE-H2 than in RE throughout the post-exercise period (p < 0.05).
CONCLUSION: Intermittent hypoxia following resistance exercise appears to preserve endothelial function and prevent transient vascular impairment, suggesting its potential as a recovery-enhancing strategy.