Department of Sports Science, Faculty of Sports Science, Kyushu Kyoritsu University, 1-8 Jiyugaoka, Yahatanishi-ku, Kitakyushu 807-8585, Japan.
Br J Sports Med. 2011 Aug;45(10):820-4. doi: 10.1136/bjsm.2009.068007. Epub 2009 Dec 1.
To determine the effects of resistive load on performance and surface electromyogram (SEMG) activity during repeated cycling sprints (RCS) on a non-isokinetic cycle ergometer.
Participants performed two RCS tests (ten 10-second cycling sprints) interspersed with both 30- and 360-second recovery periods under light (RCS(L)) and heavy load conditions (RCS(H)) in a random counterbalanced order. Recovery periods of 360 seconds were set before the fifth and ninth sprints.
In the 9th and 10th sprints, the values of peak power output divided by body mass were significantly higher in RCS(H) than in RCS(L). Changes in blood lactate concentration were not different between the two conditions. In RCS(L), the root mean square calculated from the SEMG was significantly lower in the ninth sprint than in the first sprint, but there were no differences between the root mean square in the first sprint and that in the ninth sprint in RCS(H).
During RCS on a non-isokinetic cycle ergometer, performance and SEMG activity are influenced by resistive load. It is thought that regulation of skeletal muscle recruitment by the central nervous system is associated with fatigue during RCS with a light resistive load.
在非等动式脚踏车测力计上进行重复循环冲刺（RCS）时，确定抵抗负荷对性能和表面肌电图（SEMG）活动的影响。
参与者以随机交叉平衡的顺序，在轻负荷（RCS(L)）和重负荷条件（RCS(H)）下进行两次 RCS 测试（十次 10 秒的脚踏车冲刺），两次测试之间穿插 30 秒和 360 秒的恢复期。第五次和第九次冲刺前设置 360 秒的恢复期。
在第 9 次和第 10 次冲刺中，RCS(H) 时的峰值功率输出除以体重的值明显高于 RCS(L)。两种条件下血乳酸浓度的变化没有差异。在 RCS(L)中，第 9 次冲刺的均方根从 SEMG 计算出的均方根明显低于第 1 次冲刺，但 RCS(H)中第 1 次冲刺的均方根与第 9 次冲刺的均方根没有差异。
在非等动式脚踏车测力计上进行 RCS 时，性能和 SEMG 活动受到抵抗负荷的影响。据认为，在轻抵抗负荷下进行 RCS 时，中枢神经系统对骨骼肌募集的调节与疲劳有关。
