Kume Daisuke, Iguchi Akira, Endoh Hiroshi
Department of Integrated Arts and Science, National Institute of Technology, Okinawa College, Nago, Japan.
Department of Bioresources Engineering, National Institute of Technology, Okinawa College, Nago, Japan.
Clin Physiol Funct Imaging. 2018 May;38(3):390-395. doi: 10.1111/cpf.12426. Epub 2017 Apr 16.
This study examined whether the point of accelerated deoxygenation of active muscle occurs during the 20-m shuttle run test (20mSRT) and, if so, whether it is associated with exercise performance in the test. Twenty-nine male subjects performed the 20mSRT, and concentration changes in oxyhaemoglobin (ΔOxy-Hb) and deoxyhaemoglobin (ΔDeoxy-Hb) in the m. vastus lateralis were measured using a portable near-infrared spectroscopy device. The difference between the relative concentration changes in ΔOxy-Hb and ΔDeoxy-Hb (Δ[Oxy-Hb - Deoxy-Hb]) was regarded as the muscle oxygenation index. Group-averaged Δ[Oxy-Hb - Deoxy-Hb] showed progressive decrease during the test. However, among the individuals, we found an accelerated point of decrease in Δ[Oxy-Hb - Deoxy-Hb] in 20 subjects, which revealed that the laps at the accelerated point correlated with the total laps (r = 0·78). These results demonstrate that the accelerated deoxygenation of active muscle occurs during the 20mSRT, but not in all cases. Our findings also indicate that if the accelerated point of muscle deoxygenation occurs, the timing of its appearance is related to 20mSRT performance.
本研究调查了在20米穿梭跑测试（20mSRT）期间，活跃肌肉的加速脱氧点是否会出现；如果出现，它是否与该测试中的运动表现相关。29名男性受试者进行了20mSRT测试，并使用便携式近红外光谱设备测量了股外侧肌中氧合血红蛋白（ΔOxy-Hb）和脱氧血红蛋白（ΔDeoxy-Hb）的浓度变化。ΔOxy-Hb和ΔDeoxy-Hb相对浓度变化之间的差异（Δ[Oxy-Hb - Deoxy-Hb]）被视为肌肉氧合指数。测试期间，组平均Δ[Oxy-Hb - Deoxy-Hb]呈逐渐下降趋势。然而，在个体中，我们发现20名受试者的Δ[Oxy-Hb - Deoxy-Hb]存在加速下降点，这表明加速点所在的圈数与总圈数相关（r = 0·78）。这些结果表明，活跃肌肉的加速脱氧发生在20mSRT期间，但并非在所有情况下都如此。我们的研究结果还表明，如果出现肌肉脱氧加速点，其出现的时间与20mSRT表现相关。
