〈Originals〉Relationship between Muscle Oxygenation, VO_2, and High Intensity Aerobic Exercise Performance Improving Effect of Warm-up

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概要

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• This study investigated our hypothesis that an improvement in endurance exercise performance by warm up (W-up) may be caused by altered oxygen kinetics in the working muscles. Seven well-trained male subjects participated in this study (age, 21.4 ±1.6 yrs; height, 169.6 ± 5.4 cm; weight, 58.0 ±4.1 kg; mean ± S.D.). Each subject was tested in two experiments: under a W-up condition (WU) and a no W-up condition (NW). WU was carried out for 15 minutes using a bicycle ergometer (at approximately 60% V^^・O_2peak). NW was started with the maximal exercise test without any W-up. The main exercise involved cycling at 100% V^^・O_2peak until the subject could no longer maintain the revolution rate. Exercise duration was used to evaluate endurance exercise performance. Rectal and vastus lateralis temperature, pulmonary oxygen uptake (V^^・O_2), blood lactate accumulation, and muscle oxygenation were measured throughout each experiment. Two-wave near infrared spectroscopy (NIRS) was used for the measurements of oxy hemoglobin/myoglobin (%oxyHb/Mb) and deoxy hemoglobin/myoglobin (%deoxyHb/Mb) as muscle oxygenation. WU significantly prolonged the maximal exercise duration (WU vs. NW: 376.9 ± 132.8 seconds vs. 283.7 ± 116.6 seconds, p<0.001). V^^・O_2 just before the exercise test and at the first 30 seconds of the exercise test were higher in WU than in NW. The average %oxyHb/Mb at the first 30 seconds of the exercise test was significantly higher in WU than in NW (WU vs. NW: 97.3 ± 14.8% vs. 55.0 ± 12.6%, p< 0.001). However, there were no significant differences between WU and NW in %deoxyHb/Mb at the first 30 seconds of the exercise test (WU vs. NW: 26.1 ± 14.1% vs. 34.5 ± 16.7%). Increased blood lactate accumulation per second was significantly lower in WU than NW. These results suggest that increased oxygen supplementation and body temperature facilitate aerobic metabolism, and these changes, induced by W-up, contribute to an improved high intensity exercise performance.

• 日本運動生理学会の論文

著者

• Ishii Kojiro

  Laboratory Of Human Performance And Fitness Graduate School Of Education Hokkaido University

• TAKIZAWA Kazuki

  Laboratory of Human Performance & Fitness, Graduate School of Education, Hokkaido University

• Takizawa Kazuki

  Laboratory Of Human Performance And Fitness Graduate School Of Education Hokkaido University:departm

• Ishii Kojiro

  Laboratory Of Chromosome Function And Regulation Graduate School Of Frontier Biosciences Osaka University

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