Muraki Satoshi, Tsunawake Noriaki, Yamasaki Masahiro
Department of Human Living System Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan.
Eur J Appl Physiol. 2004 Mar;91(2-3):246-52. doi: 10.1007/s00421-003-0962-8. Epub 2003 Oct 18.
The present study investigated the difference in oxygen kinetics in the exercising muscle between arm cranking and leg cycling in women. Twenty-seven females completed incremental arm cranking and leg cycling tests on separate days. During each exercise, spatially resolved near-infrared spectroscopy was used to measure changes in the tissue oxygen saturation ( SO(2)), oxygenated (oxy-) hemoglobin and/or myoglobin (Hb/Mb), deoxygenated (deoxy-) Hb/Mb, and total Hb/Mb in the triceps during arm cranking and in the vastus lateralis during leg cycling. During arm cranking, there was a rapid increase in the respiratory exchange ratio and a lower ventilatory threshold compared to leg cycling, which confirmed accelerated anaerobic glycolysis in this mode of exercise. During leg cycling, SO(2) remained decreased near to or until approaching peak oxygen uptake (VO(2peak)). During arm cranking, however, the decrease in oxy-Hb/Mb and increase in deoxy-Hb/Mb stopped at the middle of VO(2peak) (mean 51.4%), consequently resulting in a leveling off in the SO(2 )decrease, although total Hb/Mb continued to increase. These results might suggest that the oxygen demand in the triceps attained the maximum at that intensity, despite an adequate oxygen supply during arm cranking.
本研究调查了女性在进行手臂曲柄运动和腿部骑行时，运动肌肉中氧动力学的差异。27名女性在不同日期分别完成了递增式手臂曲柄运动和腿部骑行测试。在每次运动过程中，使用空间分辨近红外光谱法测量手臂曲柄运动时肱三头肌以及腿部骑行时股外侧肌的组织氧饱和度（SO₂）、氧合血红蛋白和/或肌红蛋白（Hb/Mb）、脱氧血红蛋白和/或肌红蛋白（deoxy-Hb/Mb）以及总Hb/Mb的变化。与腿部骑行相比，手臂曲柄运动时呼吸交换率迅速增加，通气阈值较低，这证实了这种运动模式下无氧糖酵解加速。在腿部骑行过程中，SO₂在接近或直至达到峰值摄氧量（VO₂peak）时一直保持下降。然而，在手臂曲柄运动中，氧合Hb/Mb的下降和脱氧Hb/Mb的增加在VO₂peak的中间阶段（平均51.4%）停止，尽管总Hb/Mb继续增加，但SO₂的下降趋于平稳。这些结果可能表明，尽管在手臂曲柄运动中有充足的氧气供应，但肱三头肌的需氧量在该强度下达到了最大值。
