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- Title
Effects of High-Intensity Inspiratory Muscle Warm-Up on High-Intensity Exercise Performance and Muscle Oxygenation.
- Authors
Koizumi, Jun; Ohya, Toshiyuki
- Abstract
Purpose: An inspiratory muscle warm-up (IMW) improves inspiratory muscle function, but the effects of high-intensity exercise are inconsistent. We aimed to determine the effects of high-intensity IMW on high-intensity exercise performance and muscle oxygenation. Methods: Ten healthy men (maximal oxygen uptake [ V ˙ O 2 max ] 52.2 [5.0] mL·kg–1·min–1) performed constant-load exercise to exhaustion on a cycle ergometer at V ˙ O 2 max under 2 IMW conditions: a placebo condition (PLA) and a high-intensity IMW condition (HIGH). The inspiratory loads were set at 15% and 80% of maximal inspiratory pressure, respectively. Maximal inspiratory pressure was measured before and after IMW. Oxyhemoglobin was measured in the vastus lateralis by near-infrared spectroscopy during exercise. Rating of perceived exertion (RPE) for a leg was measured after 1 and 2 minutes of exercise. Results: Exercise tolerance was significantly higher under HIGH than PLA (228 [49] s vs 218 [49] s, P =.003). Maximal inspiratory pressure was significantly increased by IMW under HIGH (from 125 [20] to 136 [25] cm H2O, P =.031). Oxyhemoglobin was significantly higher under HIGH than PLA at 80% of the total duration of exercise (P =.048). RPE for the leg was significantly lower under HIGH than PLA after 2 minutes of exercise (P =.019). Conclusions: Given that oxyhemoglobin is an index of local oxygen supply, the results of this study suggest that high-intensity IMW increases the oxygen supply to active limbs. It may also reflect a reduction in RPE in the leg. In addition, high-intensity IMW may improve exercise performance.
- Subjects
SKELETAL muscle physiology; PHYSIOLOGY of the anatomical extremities; EXERCISE physiology; EXERCISE; HIGH-intensity interval training; RESPIRATION; CLINICAL trials; ERGOMETRY; NEAR infrared spectroscopy; REACTIVE oxygen species; OXYGEN in the body; EXERCISE tolerance; BODY movement; QUADRICEPS muscle; WARMUP
- Publication
International Journal of Sports Physiology & Performance, 2024, Vol 19, Issue 4, p347
- ISSN
1555-0265
- Publication type
Article
- DOI
10.1123/ijspp.2023-0163