Nakata Hiroki, Oshiro Misaki, Namba Mari, Shibasaki Manabu
Department of Health Sciences, Faculty of Human Life and Environment, Nara Women's University, Nara, Japan; and.
Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan.
Am J Physiol Regul Integr Comp Physiol. 2016 Oct 1;311(4):R629-R636. doi: 10.1152/ajpregu.00153.2016. Epub 2016 Jul 27.
The present study aimed to investigate the effects of aerobic exercise on human somatosensory processing recorded by somatosensory evoked potentials (SEPs) under temperate [TEMP, 20°C and 40% relative humidity (RH)] and hot (HOT, 35°C and 30% RH) environments. Fifteen healthy subjects performed 4 × 15-min bouts of a moderate cycling exercise [mean power output: 156.5 ± 7.7 (SE) W], with a 10-min rest period and received a posterior tibial nerve stimulation at the left ankle before and after each exercise bout; SEPs were recorded in five sessions; 1st (pre), 2nd (post-1st exercise bout), 3rd (post-2nd exercise bout), 4th (post-3rd exercise bout), and 5th (post-4th exercise bout). The peak latencies and amplitudes of the P37, N50, P60, and N70 components at Cz were evaluated. The latencies of P37, N50, P60, and N70 were significantly shorter with the repetition of aerobic exercise, and these shortened latencies were significantly greater in the HOT condition than in the TEMP condition (P37: 3rd, P < 0.05, and 5th, P < 0.01; P60: 4th, P < 0.05, and 5th, P < 0.01; N70: 4th, P < 0.05, and 5th, P < 0.001). No significant differences were observed in the amplitudes of any SEP component under either thermal condition. These results suggest that the conduction velocity of the ascending somatosensory input was accelerated by increases in body temperature, and aerobic exercise did not alter the strength of neural activity in cortical somatosensory processing.
本研究旨在探讨有氧运动对人体体感诱发电位（SEP）记录的体感加工的影响，该研究在温带（TEMP，20°C，相对湿度40%）和炎热（HOT，35°C，相对湿度30%）环境下进行。15名健康受试者进行了4组，每组15分钟的中等强度自行车运动[平均功率输出：156.5±7.7（标准误）瓦]，每组运动之间有10分钟的休息时间，并且在每次运动前后对左脚踝的胫后神经进行刺激；SEP在五个阶段进行记录：第1阶段（运动前）、第2阶段（第1次运动后）、第3阶段（第2次运动后）、第4阶段（第3次运动后）和第5阶段（第4次运动后）。评估了Cz处P37、N50、P60和N70成分的峰潜伏期和波幅。随着有氧运动的重复，P37、N50、P60和N70的潜伏期显著缩短，并且这些缩短的潜伏期在炎热条件下比在温带条件下显著更大（P37：第3阶段，P<0.05，第5阶段，P<0.01；P60：第4阶段，P<0.05，第5阶段，P<0.01；N70：第4阶段，P<0.05，第5阶段，P<0.001）。在两种热环境条件下，任何SEP成分的波幅均未观察到显著差异。这些结果表明，体温升高加速了体感传入信号的传导速度，并且有氧运动并未改变皮质体感加工中神经活动的强度。
