Postactivation potentiation in skeletal muscle from the perspective of time domain characteristics

doi:10.3969/j.issn.2095-4344.0312

Abstract

Abstract:

BACKGROUND: Appropriate induced exercise has been shown to increase the output power of skeletal muscle, and enhance sport performance. However, how to control the recovery time of postactivation potentiation is an issue of concern at home and abroad.
OBJECTIVE: To investigate the effect of recovery time after heavy-load induced exercise on the postactivation potentiation.
METHODS: Thirteen college track men were recruited. Postactivation potentiation was induced by half back-squat of three repetitions at 90% 1-repetition maximum (1-RM). The static squat jump date was collected pre and post test (15 seconds, 3, 6, 9 and 12 minutes) using three-dimensional measuring platform. The pre and post date of flight height, maximum ground reaction force and peak power were analyzed by paired-t test.
RESULTS AND CONCLUSION: The flight height at baseline was significantly different from that at 3, 6 and 9 minutes post-test (P < 0.01), the peak of flight height change rate and peak of flight height in the high strength level group appeared later than those in the low strength level group. The maximum ground reaction force at baseline was significantly different from that at 15 seconds post-test (P < 0.05), the peak of maximum ground reaction force change rate in the high strength level group appeared later than those in the low strength level group. The peak power at baseline was significantly different from that at 3 and 6 minutes post-test (P < 0.01), the peak value of peak power change rate and peak power in the high strength level group appeared later than those in the low strength level group. All these findings indicate that half back-squat of three repetitions at 90% 1-RM can induce postactivation potentiation. Afterwards, the peak flight height appeared at 6 minutes, the peak maximum ground reaction force appeared at 3 minutes, and the peak power appeared at 6 minutes. The higher ratio of 1-RM/body mass, leads to latter appearance of peak of flight height, ground reaction force and peak power after induction training.

中国组织工程研究杂志出版内容重点：组织构建；骨细胞；软骨细胞；细胞培养；成纤维细胞；血管内皮细胞；骨质疏松；组织工程

Key words: Muscle, Skeletal, Resistance Training, Sports Medicine, Tissue Engineering

CLC Number:

R318

Guo Wen-xia1, Qu Shu-hua2, Kong Zhen-xing2, Liang Mei-fu3. Postactivation potentiation in skeletal muscle from the perspective of time domain characteristics[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(24): 3804-3810.

Figures/Tables 2

2.1 受试对象数量分析纳入受试者13名，男性，无中途退出者，均进入结果分析，试验流程见图1。 2.2 腾空高度结果对腾空高度各时间点观测值进行正态性检验，单样本Kolmogorov-Smirnov检验结果显示，测量数据符合正态分布(P > 0.05)。为进一步探究激活后增强效应诱导练习后腾空高度变化的时域特征，将腾空高度基线值与各时间点观测值进行配对样本t 检验，结果表明，激活后增强效应诱导练习后，受试者腾空高度基线值与 3 min(P < 0.01)、6 min(P < 0.01)，9 min(P < 0.01)时观测值具有非常显著性差异。由图2可知，腾空高度基线值(38.40±5.61) cm与3 min (41.60±6.56) cm、6 min (42.00±5.59) cm、9 min (41.70± 6.02) cm时观测值具有非常显著性差异，腾空高度峰值出现在诱导练习后6 min。由图3可知，腾空高度变化率峰值出现在诱导练习后6 min，腾空高度变化率为(10.1±10.39)%。为进一步探究不同力量水平受试者激活后增强效应的特征，将受试者分为大力量组(1-RM/体质量≥3，n=6)和小力量组(1-RM/体质量< 3，n=7)。由图4可知，诱导练习后3 min大力量组腾空高度变化率、变化率峰值、持续时间均高于小力量组，但大力量组腾空高度变化率峰值和腾空高度峰值出现时间晚于小力量组(6 min vs 3 min)。 2.3 最大地面反作用力结果对最大地面反作用力各时间点观测值进行正态性检验，单样本Kolmogorov-Smirnov检验结果显示，测量数据符合正态分布(P > 0.05)。为进一步探究激活后增强效应诱导练习后最大地面反作用力变化的时域特征，将最大地面反作用力基线值与各时间点观测值进行配对样本t 检验，结果表明，激活后增强效应诱导练习后，受试者最大地面反作用力基线值与15 s时观测值有显著性差异(P < 0.05)。由图5可知，最大地面反作用力基线值 (1 547.6±213.0) N与15 s(1 581.9±196.9) N时观测值具有显著性差异。最大地面反作用力峰值出现在诱导练习后 3 min，由箱型大小可知，组内个体间最大地面反作用力差异性较大，该时间点观测值与基线值在0.05水平上不具有显著性差异。由图6可知，最大地面反作用力变化率峰值出现在诱导练习后6 min，最大地面反作用力变化率为(2.50±4.97)%。由图7可知，诱导练习后小力量组各时间点最大地面反作用力变化率均为正值，且大于大力量组；大力量组最大地面反作用力变化率峰值和最大地面反作用力峰值出现时间晚于小力量组(3 min vs.15 s)。 2.4 峰值功率统计结果对峰值功率各时间点观测值进行正态性检验，单样本Kolmogorov-Smirnov检验结果显示，测量数据符合正态分布(P > 0.05)。为进一步探究激活后增强效应诱导练习后峰值功率变化的时域特征，将峰值功率基线值与各时间点观测值进行配对样本t 检验，结果表明，激活后增强效应诱导练习后，受试者峰值功率基线值与3 min(P < 0.01)时观测值具有非常显著性差异，与 6 min(P < 0.05)时观测值具有显著性差异。由图8可知，峰值功率基线值(3 894.2±1 206.1) W与 3 min(4 269.2±1 186.3) W时观测值具有非常显著性差异，与6 min(4 324.9±1 479.8) W时观测值具有显著性差异。峰值功率出现在诱导练习后6 min，由箱型大小可知，组内个体间峰值功率差异性较大，该时间点观测值与基线值在0.01水平上不具有显著性差异。由图9可知，峰值功率变化率峰值出现在诱导练习后3 min，峰值功率变化率为(11.2±11.94)%。由图10可知，诱导练习后大力量组3，6， 9 min峰值功率变化率大于小力量组，但持续时间小于小力量组(9 min vs 12 min)；大力量组峰值功率变化率峰值和峰值功率峰值出现时间晚于小力量组(6 min vs 15 s)。"

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