Kume Daisuke, Iguchi Akira, Endoh Hiroshi
1 National Institute of Technology, Okinawa College.
2 University of the Ryukyus.
Pediatr Exerc Sci. 2018 Nov 1;30(4):474-479. doi: 10.1123/pes.2017-0210. Epub 2018 Jul 13.
This study aimed to compare the relative exercise intensity at which the onset of accelerated muscle deoxygenation occurs during the 20-m shuttle run test (20mSRT) between boys and men and to examine whether the timing of the onset of acceleration appearance is related to 20mSRT performance in boys.
Twenty-four boys performed the 20mSRT, during which concentration changes in oxygenated and deoxygenated hemoglobin and myoglobin (ΔOxy-Hb and ΔDeoxy-Hb, respectively) in the m. vastus lateralis were monitored using a portable near-infrared spectroscopy device. The boys' data were compared with those of 29 men in a previous study.
An onset of accelerated decrease in Δ[Oxy-Hb - Deoxy-Hb] was found in 11 of the 24 boys (45.8%) and 20 of the 29 men (69.0%) and was found at a higher relative exercise intensity in the boys than in the men. The number of laps at which the onset of acceleration occurred correlated with total laps in the boys (r = .87).
These findings demonstrate that the onset of accelerated muscle deoxygenation during the 20mSRT occurs at a higher relative exercise intensity in boys than in men. Our findings also show that the timing of the onset of acceleration appearance is associated with 20mSRT performance in boys.
本研究旨在比较男孩和男性在20米往返跑测试（20mSRT）期间肌肉脱氧加速开始时的相对运动强度，并研究加速出现时间是否与男孩的20mSRT表现相关。
24名男孩进行20mSRT，在此期间使用便携式近红外光谱设备监测股外侧肌中氧合血红蛋白和脱氧血红蛋白以及肌红蛋白（分别为ΔOxy-Hb和ΔDeoxy-Hb）的浓度变化。将男孩的数据与先前一项研究中29名男性的数据进行比较。
在24名男孩中有11名（45.8%）和29名男性中有20名（69.0%）出现了Δ[Oxy-Hb - Deoxy-Hb]加速下降的情况，并且男孩出现这种情况时的相对运动强度高于男性。加速开始时的圈数与男孩的总圈数相关（r = 0.87）。
这些发现表明，在20mSRT期间，男孩肌肉脱氧加速开始时的相对运动强度高于男性。我们的研究结果还表明，加速出现的时间与男孩的20mSRT表现相关。
