Hachiya T, Blaber A P, Aizawa S, Saito M
Kinesiology, Simon Fraser University, Burnaby, Canada.
Int J Sports Med. 2008 Aug;29(8):646-51. doi: 10.1055/s-2007-989373. Epub 2007 Dec 17.
We tested the hypothesis that the initial heart rate (HR) response at the onset of maximal handgrip contraction is altered after training. 17 volunteers (nine trained and eight controls) performed ten intermittent static handgrip contractions with maximal effort, alternating between 15-s contractions and 15-s pauses. High-intensity static handgrip training was performed using the nondominant arm alone for 4 weeks. Handgrip force (HGF) and HR were analyzed for the initial 7 s of every static handgrip exercise. Peak HR (pre-training: 94.5 +/- 12.8 beats/min; post-training: 89.7 +/- 10.2 beats/min, p < 0.05) decreased. However, the magnitude of HR change at the onset of contraction remained constant (pre-training: 23.0 +/- 7.7 beats/min; post-training: 25.7 +/- 6.5 beats/min, p = 0.0767), while the HR responses in the subsequent bouts increased after training (p < 0.001). The resting HR decreased (pre-training: 71.5 +/- 9.3 beats/min; post-training 64.1 +/- 5.7 beats/min, p < 0.05). Maximal HGF increased by 11.1 % in trained arms and by 8.7 % in untrained arms, although an increase in maximal forearm girth was only observed in the trained arm (2.0 %, p < 0.0001). Although high-intensity training modulated the abrupt HR responses, the magnitude of the response remained unchanged at the onset of maximal forearm contraction and the resting HR significantly decreased.
训练后，最大程度握力收缩开始时的初始心率（HR）反应会发生改变。17名志愿者（9名训练者和8名对照组）竭尽全力进行了10次间歇性静态握力收缩，每次收缩15秒，间歇15秒。仅使用非优势手臂进行高强度静态握力训练，为期4周。对每次静态握力练习的前7秒的握力（HGF）和心率进行分析。峰值心率下降（训练前：94.5±12.8次/分钟；训练后：89.7±10.2次/分钟，p<0.05）。然而，收缩开始时心率变化的幅度保持不变（训练前：23.0±7.7次/分钟；训练后：25.7±6.5次/分钟，p = 0.0767），而训练后随后几次收缩中的心率反应增加（p<0.001）。静息心率下降（训练前：71.5±9.3次/分钟；训练后：64.1±5.7次/分钟，p<0.05）。训练手臂的最大握力增加了11.1%，未训练手臂增加了8.7%，尽管仅在训练手臂中观察到最大前臂围度增加（2.0%，p<0.0001）。尽管高强度训练调节了突然的心率反应，但在最大前臂收缩开始时反应的幅度保持不变，且静息心率显著下降。
