The effect of an active warm-up on surface EMG and muscle performance in healthy humans
The effect of an active warm-up on surface EMG and muscle performance in healthy humans
复制标题
主动热身对健康人表面肌电图和肌肉性能的影响
DOI：
10.1007/s00421-003-0798-2
复制
发表时间：
2003
影响因子：
3
通讯作者：
G. de Vito
中科院分区：
文献类型：
--
作者：
David Stewart;A. Macaluso;G. de Vito
研究了主动热身对最大随意收缩（MVC）、最大瞬时功率输出和表面肌电图（sEMG）参数的影响。八名志愿者 [平均 (SD) 22 (4) 岁] 在同一天完成了两项试验，一项是对照 (CO)，另一项是在通气当量方法确定的 70% 通气阈值下进行主动循环热身 (WU)。使用柔性热敏电阻从股外侧肌测量的股四头肌温度，CO 中为 33.8 (0.4)°C，而 WU 中为 36.8 (0.5)°C (P<0.05)。通过红外鼓膜热敏电阻测量的听觉温度在不同条件下没有差异。实验包括 90° 角的 3 次膝关节伸展最大自主收缩，同时记录股外侧肌的 sEMG，然后在力平台上进行 3 次深蹲跳。 SEMG 在频域中以中频 (MDF) 进行分析，在时域中以均方根 (RMS) 进行分析。 CO 中的 MDF 为 59.2 (14.1) Hz，WU 中为 67.2 (11.8) Hz (P<0.05)，而 CO 中的 RMS 高于 WU [0.65 (0.28) mV vs. 0.56 (0.19) mV； P<0.05]。 MVC 没有不同 [465.7 (107.6) N vs. 490.1 (117.2) N]，而 WU 试验中深蹲跳跃期间的瞬时功率输出明显更高 [3324 (866) W vs. 3569 (919) W； P<0.05]。这些数据显示 MDF 会随着主动预热而改变，这与更大的传导速度有关。这可能会转化为肌肉纤维的更快激活，从而部分解释了功率输出的增加。
The effect of an active warm-up on maximal voluntary contraction (MVC), maximal instantaneous power output and surface EMG (sEMG) parameters was studied. Eight volunteers [mean (SD) 22 (4) years] completed two trials on the same day, one control (CO), and the other preceded by an active cycling warm-up (WU) at 70% ventilatory threshold determined by the ventilatory equivalent method. Quadriceps muscle temperature, measured from vastus lateralis with a flexible thermistor, was 33.8 (0.4)°C in CO compared to 36.8 (0.5)°C in WU (P<0.05). Aural temperature, measured by an infrared tympanic thermistor, was not different between conditions. Experimental trials consisted of three knee-extension maximum voluntary contractions at a 90° angle with simultaneous recording of sEMG from the vastus lateralis, followed by three squat jumps performed on a force platform. SEMGs were analysed in the frequency domain as median frequency (MDF) and in the time domain as root mean square (RMS). MDF was 59.2 (14.1) Hz in CO compared to 67.2 (11.8) Hz in WU (P<0.05), while RMS was higher in CO compared to WU [0.65 (0.28) mV vs. 0.56 (0.19) mV; P<0.05]. MVC was not different [465.7 (107.6) N vs. 490.1 (117.2) N], whilst instantaneous power output during the squat jump was significantly higher in the WU trial [3324 (866) W vs. 3569 (919) W; P<0.05]. These data show MDF to be altered with an active warm-up, which would relate to a greater conduction velocity. This may translate into faster activation of the muscle fibres, thus partly explaining the increase in power output.
DOI：
10.1097/00003086-198310000-00042
发表时间：
1983-01-01
影响因子：
4.2
作者：
WICKIEWICZ, TL;ROY, RR;EDGERTON, VR
通讯作者：
EDGERTON, VR