Int J Sports Physiol Perform. 2019 Jul 1;14(6):765–770. doi: 10.1123/ijspp.2018-0349.
This study assessed the utility of force-time characteristics from the isometric midthigh pull (IMTP) as a measure of neuromuscular function after elite-level Australian rules football matches. It was hypothesized that rate characteristics of force development would demonstrate a different response magnitude and recovery time course than peak force measurements. Force-time characteristics of the IMTP (peak force, 0- to 50-ms rate of force development [RFD], 100- to 200-ms RFD) were collected at 48 (G+2), 72 (G+3), and 96 h (G+4) after 3 competitive Australian rules football matches. Meaningful reductions (>75% of the smallest worthwhile change) were observed at G+2, G+3, and G+4 for RFD 0-50 milliseconds (-25.8%, -17.5%, and -16.9%) and at G+2 and G+3 for RFD 100-200 milliseconds (-15.7% and -11.7%). No meaningful reductions were observed for peak force at any time point (G+2 -4.0%, G+3 -3.9%, G+4 -2.7%). Higher week-to-week variation was observed for RFD 0-50 milliseconds (G+2 17.1%, G+3 27.2%, G+4 19.3%) vs both RFD 100-200 milliseconds (G+2 11.3%, G+3 11.5%, G+4 7.2%) and peak force (G+2 4.8%, G+3 4.4%, G+4 8.4%). These findings highlight the potential use of rate characteristics from the IMTP as measures of neuromuscular function in elite sport settings, and in particular RFD 100-200 milliseconds due to its higher reliability. Interestingly, peak force collected from the IMTP was not meaningfully suppressed at any time point after elite Australian rules football match play. This suggests that rate characteristics from IMTP may provide more sensitive and valuable insight regarding neuromuscular function recovery kinetics than peak measures.
本研究评估了等长大腿拉伸（IMTP）的力-时特征作为精英级澳式足球比赛后神经肌肉功能的测量指标的效用。假设力发展的速率特征的响应幅度和恢复时间过程将不同于峰值力测量。在 3 场竞争性澳式足球比赛后 48（G+2）、72（G+3）和 96（G+4）小时，收集了 IMTP 的力-时特征（峰值力、0-50ms 的力发展速率[RFD]、100-200ms 的 RFD）。在 G+2、G+3 和 G+4 时，0-50ms 的 RFD（-25.8%、-17.5%和-16.9%）和 100-200ms 的 RFD（-15.7%和-11.7%）观察到有意义的降低（>75%的最小有意义变化）。在任何时间点，峰值力均未观察到有意义的降低（G+2-4.0%、G+3-3.9%、G+4-2.7%）。在 G+2 时，0-50ms 的 RFD 的周间变异性更高（G+2 17.1%、G+3 27.2%、G+4 19.3%），而 100-200ms 的 RFD（G+2 11.3%、G+3 11.5%、G+4 7.2%）和峰值力（G+2 4.8%、G+3 4.4%、G+4 8.4%）则较低。这些发现强调了 IMTP 的速率特征作为精英运动环境中神经肌肉功能测量指标的潜在用途，特别是 100-200ms 的 RFD，因为其可靠性更高。有趣的是，在精英澳式足球比赛后，任何时间点 IMTP 的峰值力均未明显降低。这表明，与峰值测量相比，IMTP 的速率特征可能提供了更敏感和有价值的神经肌肉功能恢复动力学洞察力。
