Beato Marco, Stiff Adam, Coratella Giuseppe
School of Science, Technology and Engineering, University of Suffolk, Ipswich, United Kingdom; and.
Department of Biomedical Sciences for Health, University of Milan, Italy.
J Strength Cond Res. 2021 Jul 1;35(7):1825-1832. doi: 10.1519/JSC.0000000000003005.
Beato, M, Stiff, A, and Coratella, G. Effects of postactivation potentiation after an eccentric overload bout on countermovement jump and lower-limb muscle strength. J Strength Cond Res 35(7): 1825-1832, 2021-This study aimed to evaluate the postactivation potentiation (PAP) effects of an eccentric overload (EOL) exercise on countermovement jump (CMJ) performance and isokinetic lower-limb muscle strength. Eighteen active men (mean ± SD, age 20.2 ± 1.4 years, body mass 71.6 ± 8 kg, and height 178 ± 7 cm) were involved in a randomized, crossover study. The subjects performed 3 sets per 6 repetitions of EOL half squats at maximal power using a flywheel ergometer. Postactivation potentiation using an EOL exercise was compared with a control condition (10-minute cycling at 1 W·kg-1). Countermovement jump height, peak power, impulse, and force were recorded at 15 seconds, 1, 3, 5, 7, and 9 minutes after an EOL exercise or control. Furthermore, quadriceps and hamstrings isokinetic strength were performed. Postactivation potentiation vs. control reported a meaningful difference for CMJ height after 3 minutes (effect size [ES] = 0.68, p = 0.002), 5 minutes (ES = 0.58, p = 0.008), 7 minutes (ES = 0.57, p = 0.022), and 9 minutes (ES = 0.61, p = 0.002), peak power after 1 minute (ES = 0.22, p = 0.040), 3 minutes (ES = 0.44, p = 0.009), 5 minutes (ES = 0.40, p = 0.002), 7 minutes (ES = 0.29, p = 0.011), and 9 minutes (ES = 0.30, p = 0.008), as well as quadriceps concentric, hamstrings concentric, and hamstrings eccentric peak torque (ES = 0.13, p = 0.001, ES = 0.24, p = 0.003, and ES = 0.22, p = 003, respectively) after 3-9 minutes of rest. In conclusion, the present outcomes highlight that PAP using an EOL bout improves height, peak power, impulse, and peak force during CMJ, as well as quadriceps and hamstrings isokinetic strength in male athletes. Moreover, the optimal time window for the PAP was found from 3 to 9 minutes.
贝阿托、M、斯蒂夫、A和科拉泰拉、G。离心超负荷训练后激活后增强效应对反向运动跳跃和下肢肌肉力量的影响。《力量与体能研究杂志》35(7): 1825 - 1832, 2021——本研究旨在评估离心超负荷（EOL）运动对反向运动跳跃（CMJ）表现和等速下肢肌肉力量的激活后增强（PAP）效应。18名活跃男性（平均±标准差，年龄20.2±1.4岁，体重71.6±8千克，身高178±7厘米）参与了一项随机交叉研究。受试者使用飞轮测力计以最大功率进行每组6次重复、共3组的EOL半蹲训练。将使用EOL运动的激活后增强与对照条件（以1瓦·千克-1的功率骑行10分钟）进行比较。在EOL运动或对照后15秒、1、3、5、7和9分钟记录反向运动跳跃高度、峰值功率、冲量和力量。此外，还进行了股四头肌和腘绳肌的等速力量测试。激活后增强与对照相比，在3分钟后CMJ高度有显著差异（效应量[ES]=0.68，p = 0.002）、5分钟（ES = 0.58，p = 0.008）、7分钟（ES = 0.57，p = 0.022）和9分钟（ES = 0.61，p = 0.002），1分钟后峰值功率有显著差异（ES = 0.22，p = 0.040）、3分钟（ES = 0.44，p = 0.009）、5分钟（ES = 0.40，p = 0.002）、7分钟（ES = 0.29，p = 0.011）和9分钟（ES = 0.30，p = 0.008），以及在休息3 - 9分钟后股四头肌向心、腘绳肌向心和腘绳肌离心峰值扭矩有显著差异（分别为ES = 0.13，p = 0.001、ES = 0.24，p = 0.003和ES = 0.22，p = 0.003）。总之，目前的结果表明，使用EOL训练的PAP可提高男性运动员在CMJ过程中的高度、峰值功率、冲量和峰值力量，以及股四头肌和腘绳肌的等速力量。此外，发现PAP的最佳时间窗口为3至9分钟。
