Influence of Acute Hypoxic Exposure on Rating of Perceived Exertion and Physiological Responses during Resistance Exercise

• Main Authors: Chen, Ying-Chen, 陳瑩甄
• Other Authors: Ho, Jen-Yu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/77507200933667054128

碩士 === 國立臺灣師範大學 === 運動科學研究所 === 100 === Purpose: This study aimed to examine the influence of acute hypoxic exposure on rating of perceived exertion (RPE) and physiological responses during resistance exercise. Methods: After completing one repetition maximum (1RM) testing, 12 resistance-trained male volunteers (24.25 ± 2.63 yrs, 176.28 ± 7.17cm, 73.9 ± 7.95kg) performed back squat and bench press exercises under hypoxia (FiO2=15%) and normoxia in a crossover counterbalanced design. All participants performed back squat and then bench press exercises at low intensity (L; 1 set of 12 repetitions at 30％1RM), moderate intensity(M; 1 set of 6 repetitions at 60％1RM) and high intensity (H; 1 set of 4 repetitions at 90％of 1RM). RPE(Local,Overall), heart rate(HR), blood lactate, peripheral oxygen saturation (SPO2) and blood pressures(BP) were obtained immediately after each set of exercises for all intensities. Results: For bench press, statistical analyses revealed RPE, HR and blood lactate increased as exercise intensity increased regardless of environmental conditions (p≤.05). No significant differences in RPE and blood lactate were found between hypoxia and normoxia(p>.05), except that HR were significantly higher in hypoxia than in normoxia. For back squat, RPE and HR increased as exercise intensity increased during either hypoxia or normoxia. However, blood lactate remained similar among all intensities. No significant differences in RPE, HR and blood lactate were found between hypoxia and normoxia. In addition, both local and overall RPE were significantly correlated with HR and blood lactate. Conclusion: When performing resistance exercise under hypoxia, RPE can reflect on exercise intensity and highly correlated with HR and blood lactate. RPE can be used to effectively monitor resistance exercise intensity under hypoxia.