| Summary: | 碩士 === 國立臺灣師範大學 === 運動競技學系 === 104 === Purpose: To investigate the effects of inspiratory muscle (IM) warm-up on subsequent high-intensity repeated sprint performance and recovery time. Methods: Twelve female Division I soccer players (age, 20.1 ± 1.4 yrs, height, 1.61 ± 0.4 m, body mass, 55.4 ± 4.3 kg) were recruited in this repeated measures and crossover designed study. All participants were requested to perform three different treatments, two sets of 30 breaths at 40% and 15% maximum inspiratory mouth pressure (PImax) were respectively peformed in inspiratory muscle warm-up (IMW) and placebo (PLA), but no IM warm-up activity was used in control (CON). After each treatment, all participants performed the repeated sprint test which consisted of 15 sprints of 20 meters with passive recovery. The recovery time of passive recovery, ranged from 5 to 30 seconds, was self-selected by participants based on their recovery feelings. The sprint time, recovery time, muscle oxygen saturation of gastrocnemius, blood lactate concentration, rating of perceived exertion (RPE), and perceived intensity of breathlessness sensation (RPB) were measured during the experiments. Results: The recovery time during sprint 11–15 of repeated sprint test in IMW was significantly lower than that in CON (IMW vs. CON, 20.5 ± 3.6 vs. 23.2 ± 3.2 sec, p < .05). No significant differences were found on repeated sprint performance among trials. The PImax at 5-min after repeated sprint test in IMW was significantly higher than those in PLA and CON (IMW vs. PLA vs. CON, 102.2 ± 10.5 vs. 95.8 ± 9.7 vs. 94.1 ± 11.3 cmH2O, p < .05). The RPE immediately after repeated sprint test in IMW was significantly lower than that in CON (IMW vs. PLA, 13.8 ± 1.4 vs. 15.8 ± 2.1, p < .05). The RPB immediately after repeated sprint test in IMW was also significantly lower than those in PLA and CON (IMW vs. PLA vs. CON, 4.6 ± 1.3 vs. 5.4 ± 1.6 vs. 5.6 ± 1.1, p < .05). However, the tissue saturation index (TSI) in IMW during sprint 1–5 was significantly lower than that in CON (IMW vs. CON, -9.60 ± 3.18 vs. -7.94 ± 3.01 %, p < .05). Conclusion: IMW could improve inspiratory muscle strength and RPB, thus enhancing the recovery ability during high-intensity repeated sprints. However, the IMW activities might decrease the muscle oxygen saturation at the beginning of repeated sprints.
|
|---|
