| Summary: | 碩士 === 國立臺灣師範大學 === 運動競技學系 === 100 === Purpose: To investigate the effects of inspiratory muscle (IM) warm-up on subsequent high-intensity intermittent cycling performance. Methods: Twelve male athletes (age, 21.3 ± 2.0 yrs; height, 178.7 ± 6.8 cm; weight, 72.0 ± 7.2 kg) were voluntarily recruited in this repeated measures and crossover designed study. All participants were requested to perform three different experimental treatments, including inspiratory muscle warm-up (IMW), placebo (PLA) and control (CON). The control trial was without IM warm-up while the PLA and IMW were with IM warm-up by performing two sets of 30 breaths at 15% and 40% maximum inspiratory mouth pressure (PImax), respectively. After treatment, participants repeatedly performed 10 s sprint at 180% of maximal aerobic power output with 20 s rest interval on a cycling ergometer until exhaustion. The numbers of sprint, blood lactate and ammonia concentrations, ratings of perceived exertion (RPE), and perceived intensity of breathlessness sensation (RPB), and muscle oxygen saturation of the vastus lateralis were measured during the experiments. Results: No significant differences were found on the numbers of sprint, blood lactate and ammonia concentrations among three treatments. The RPE and RPB scores in IMW at pre-test were significantly higher than those in PLA (RPE, IMW vs. PLA, 10.3 ± 2.5 vs. 8.5 ± 2.4, p < .05; RPB, IMW vs. PLA, 1.3 ± 1.2 vs. 0.7 ± 0.7, p < .05), and the RPB in PLA at 5-min post-test was significantly lower than that in CON (PLA vs. CON, 3.0 ± 1.3 vs. 4.1 ± 1.9, p < .05). The tissue saturation index (TSI) in IMW at the three sprints before median of sprints was significantly higher than that in CON (IMW vs. CON, -15.95 ± 2.80 vs. -20.14 ± 5.57 %, p < .05). The deoxygenated haemoglobin (HHb) in IMW at three sprints before (IMW vs. CON, 17.44 ± 5.84 vs. 21.37 ± 5.14 μmol, p < .05) and after (IMW vs. CON, 17.49 ± 5.94 vs. 21.44 ± 5.36 μmol, p < .05) median of sprints, and at the last three sprints (IMW vs. CON, 17.46 ± 5.94 vs. 21.37 ± 4.87 μmol, p < .05) during high-intensity intermittent cycling test were significantly lower than those in CON. Conclusion: These results indicate that the IMW might not improve the subsequent high-intensity intermittent cycling sprint performance, however, the warm-up activities in this manner could attenuate the sprint-induced muscle deoxygenation.
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