School of Health and Sports Science, University of Suffolk, Ipswich, United Kingdom.
EUSES Health and Sport Sciences School, University of Girona, Girona, Spain.
J Strength Cond Res. 2021 Dec 1;35(12):3327-3333. doi: 10.1519/JSC.0000000000003359.
Beato, M, Madruga-Parera, M, Piqueras-Sanchiz, F, Moreno-Pérez, V, and Romero-Rodriguez, D. Acute effect of eccentric overload exercises on change of direction performance and lower-limb muscle contractile function. J Strength Cond Res 35(12): 3327-3333, 2021-This study aimed to evaluate the postactivation potentiation (PAP) effects following eccentric overload (EOL) exercises on change of direction (COD) performance and muscle contractile function. Thirty-one male soccer players (age 21 ± 4 years; body mass 77.0 ± 5.2 kg) were involved in a cross-sectional study. Dominant-leg (COD-5mD) and non-dominant-leg (COD-5mND) shuttle tests were performed 4 minutes after the EOL exercises. Muscle contractile function was assessed by tensiomyography (TMG) such as muscle contraction time (Tc), time delay (Td) and displacement of the muscle belly (Dm) of vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF). Eccentric overload exercises were: (a) cross-cutting step with inertial conical pulley (INC = 11 subjects), (b) flywheel leg extension (EXT = 10 subjects), and flywheel yo-yo squat exercise (SQU = 10 subjects). Differences baseline-post were found on COD-5mD (p < 0.001) and on COD-5mND (p < 0.001), but not between groups (p > 0.05) following EOL exercises. Differences from baseline were found in VL Td (p < 0.001), VM Td (p = 0.003), RF Tc (p < 0.001), and RF Td (p < 0.001) with no significant differences between the EOL exercises. This study reported a significant positive PAP response on COD-5mD and COD-5mND after 4 minutes of recovery after EOL exercises (INC, EXT and SQU) in soccer players. For the first time, it has been reported that EOL exercises acutely affect TMG variables (e.g., Tc and Td) in lower limbs. Such results related to changes in muscular contractile functions may contribute to explain the physiological mechanisms (e.g., neuromuscular factors) associated with PAP effect.
贝托、M、马德里加-帕雷拉、M、皮奎拉斯-桑奇兹、F、莫雷诺-佩雷斯、V 和罗梅罗-罗德里格斯、D. 离心过载练习对变向性能和下肢肌肉收缩功能的急性影响。J 力量与调节研究 35(12):3327-3333,2021-本研究旨在评估离心过载(EOL)练习后对变向(COD)性能和肌肉收缩功能的后激活增强(PAP)效应。31 名男性足球运动员(年龄 21 ± 4 岁;体重 77.0 ± 5.2 千克)参与了一项横断面研究。在 EOL 练习后 4 分钟进行了主导腿(COD-5mD)和非主导腿(COD-5mND)穿梭测试。通过肌动描记术(TMG)评估肌肉收缩功能，如股外侧肌(VL)、股中间肌(VM)和股直肌(RF)的肌肉收缩时间(Tc)、时间延迟(Td)和肌肉腹部位移(Dm)。离心过载练习为:(a)带惯性锥形滑轮的交叉切割步(INC=11 名受试者)，(b)飞轮腿伸展(EXT=10 名受试者)和飞轮 yo-yo 深蹲练习(SQU=10 名受试者)。EOL 练习后，COD-5mD(p<0.001)和 COD-5mND(p<0.001)出现基线后差异，但组间无差异(p>0.05)。VL Td(p<0.001)、VM Td(p=0.003)、RF Tc(p<0.001)和 RF Td(p<0.001)的基线差异，EOL 练习之间无显著差异。本研究报道了在 EOL 练习后 4 分钟的恢复期，足球运动员的 COD-5mD 和 COD-5mND 出现了显著的正 PAP 反应(INC、EXT 和 SQU)。这是第一次报道离心过载练习对下肢 TM G 变量(如 Tc 和 Td)有急性影响。这些与肌肉收缩功能变化相关的结果可能有助于解释与 PAP 效应相关的生理机制(如神经肌肉因素)。
