1. The Relationship between Inspiratory Muscle Strength and Cycling Performance: Insights from Hypoxia and Inspiratory Muscle Warm-Up.
- Author
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Oliveira, André Luiz Musmanno Branco, Rodrigues, Gabriel Dias, Rohan, Philippe de Azeredo, Gonçalves, Thiago Rodrigues, and Soares, Pedro Paulo da Silva
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WARMUP ,CYCLING ,MUSCLE strength ,RESPIRATORY muscles ,HYPOXEMIA ,TIME trials ,PLACEBOS - 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 (FiO
2 : 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 (NORIMW : 893.8 ± 31.5 vs. NORPLA : 925.5 ± 51.0 s; HYPIMW : 976.8 ± 34.2 vs. HYPPLA : 1008.3 ± 56.0 s; p > 0.05), while ventilation was higher in HYPIMW (107.7 ± 18.3) than HYPPLA (100.1 ± 18.9 L.min−1 ; p ≤ 0.05), and SpO2 was lower (HYPIMW : 73 ± 6 vs. HYPPLA : 76 ± 6%; p ≤ 0.05). A post-exercise-induced reduction in inspiratory strength was correlated with exercise elapsed time during IMW sessions (HYPIMW : r = −0.79; p ≤ 0.05; NORIMW : r = −0.70; p ≤ 0.05). IMW did not improve the 10 km time trial performance under normoxia and hypoxia. [ABSTRACT FROM AUTHOR]- Published
- 2024
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