The Relationship between Inspiratory Muscle Strength and Cycling Performance: Insights from Hypoxia and Inspiratory Muscle Warm-Up.

IF 2.6 Q1 SPORT SCIENCES

Journal of Functional Morphology and Kinesiology Pub Date : 2024-05-31 DOI:10.3390/jfmk9020097

André Luiz Musmanno Branco Oliveira, Gabriel Dias Rodrigues, Philippe de Azeredo Rohan, Thiago Rodrigues Gonçalves, Pedro Paulo da Silva Soares

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引用次数: 0

Abstract

Hypoxia increases inspiratory muscle work and consequently contributes to a reduction in exercise performance. We evaluate the effects of inspiratory muscle warm-up (IMW) on a 10 km cycling time trial in normoxia (NOR) and hypoxia (HYP). Eight cyclists performed four time trial sessions, two in HYP (FiO₂: 0.145) and two in NOR (FiO₂: 0.209), of which one was with IMW (set at 40% of maximal inspiratory pressure-MIP) and the other was with the placebo effect (PLA: set at 15% MIP). Time trials were unchanged by IMW (NOR_IMW: 893.8 ± 31.5 vs. NOR_PLA: 925.5 ± 51.0 s; HYP_IMW: 976.8 ± 34.2 vs. HYP_PLA: 1008.3 ± 56.0 s; p > 0.05), while ventilation was higher in HYP_IMW (107.7 ± 18.3) than HYP_PLA (100.1 ± 18.9 L.min^-1; p ≤ 0.05), and SpO₂ was lower (HYP_IMW: 73 ± 6 vs. HYP_PLA: 76 ± 6%; p ≤ 0.05). A post-exercise-induced reduction in inspiratory strength was correlated with exercise elapsed time during IMW sessions (HYP_IMW: r = -0.79; p ≤ 0.05; NOR_IMW: r = -0.70; p ≤ 0.05). IMW did not improve the 10 km time trial performance under normoxia and hypoxia.

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吸气肌力量与自行车运动成绩之间的关系：低氧和吸气肌热身的启示

缺氧会增加吸气肌肉的工作，从而导致运动成绩下降。我们评估了在常氧（NOR）和低氧（HYP）条件下吸气肌热身（IMW）对 10 公里自行车计时赛的影响。八名自行车运动员进行了四次计时赛，其中两次在 HYP（FiO2：0.145）条件下，两次在 NOR（FiO2：0.209）条件下，其中一次进行了吸气肌肉热身（设定为最大吸气压力的 40%-MIP），另一次进行了安慰剂效应（PLA：设定为 MIP 的 15%）。试验时间与 IMW 无关（NORIMW：893.8 ± 31.5 vs. NORPLA：925.5 ± 51.0 秒；HYPIMW：976.8 ± 34.2 vs. HYPPLA：1008.3 ± 56.0 秒；P > 0.05），而 HYPIMW 的通气量（107.7 ± 18.3）高于 HYPPLA（100.1 ± 18.9 L.min-1；p ≤ 0.05），SpO2 更低（HYPIMW：73 ± 6 vs. HYPPLA：76 ± 6%；p ≤ 0.05）。在 IMW 课程中，运动后引起的吸气强度下降与运动时间相关（HYPIMW：r = -0.79；p ≤ 0.05；NORIMW：r = -0.70；p ≤ 0.05）。在常氧和低氧条件下，IMW并没有提高10公里计时赛的成绩。

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来源期刊

Journal of Functional Morphology and Kinesiology Health Professions-Physical Therapy, Sports Therapy and Rehabilitation

CiteScore

4.20

自引率

0.00%

发文量

审稿时长

12 weeks