EFFECTS OF TWO DIFFERENT FLYWHEEL RESISTANCE TRAINING PROTOCOLS ON EXPLOSIVE KNEE EXTENSION STRENGTH: A PILOT RANDOMIZED STUDY

IF 0.2 Q4 SPORT SCIENCES Kinesiologia Slovenica Pub Date : 2023-12-29 DOI:10.52165/kinsi.29.3.5-25
Darjan Spudić, Benjamin J. Narang, P. Pori, V. Strojnik, N. Šarabon, Igor Štirn
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Abstract

The aim of our study was to evaluate differences in explosive isometric knee extension strength adaptations after a flywheel squat resistance training programs performed under low- and high-load conditions. Twenty physically active adults were randomly assigned to an individually allocated high- or low-load eight-week training intervention. Isometric knee extension rate of torque development (RTD) and rate of electromyography signal rise (RER) variables were assessed pre and post eight-week intervention. Statistically significant improvements in the RTD slope variables (100 and 200 ms time intervals after the onset of torque rise; p < 0,05) were observed, regardless of the training load used. Normalized averaged vastus lateralis and rectus femoris electromyography (EMG) amplitude decreased in the intervals 80 ms before, and 75, 100 and 200 ms after the onset of activation (all p < 0,05), regardless of the training group. Our results suggest that high- and low-load resistance flywheel training interventions induce similar increases in explosive knee extension strength, accompanied with a decrease in time-analog normalized EMG signal amplitude.
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两种不同飞轮阻力训练方案对膝关节伸展爆发力的影响:一项试验性随机研究
我们的研究旨在评估在低负荷和高负荷条件下进行飞轮深蹲阻力训练后,爆发力等长伸膝力量适应性的差异。20 名身体活跃的成年人被随机分配到单独分配的高负荷或低负荷八周训练干预中。在为期八周的干预前后,对等长膝关节伸展力矩发展速率(RTD)和肌电信号上升速率(RER)变量进行了评估。无论采用何种训练负荷,RTD斜率变量(扭矩上升开始后的100毫秒和200毫秒时间间隔;P < 0.05)均有明显改善。在激活开始前 80 毫秒、激活开始后 75 毫秒、100 毫秒和 200 毫秒的时间间隔内,归一化的平均大腿外侧肌和股直肌肌电图(EMG)振幅均有所下降(p < 0.05),与训练组无关。我们的研究结果表明,高负荷和低负荷阻力飞轮训练干预能诱导膝关节爆发性伸展力量的相似增长,同时伴随着时间模拟归一化肌电图信号振幅的下降。
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Kinesiologia Slovenica
Kinesiologia Slovenica SPORT SCIENCES-
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