London Sport Institute, Middlesex University, London, United Kingdom.
Aspetar Sports Medicine Hospital, Doha, Qatar.
J Strength Cond Res. 2021 Aug 1;35(8):2127-2132. doi: 10.1519/JSC.0000000000003109.
Bishop, C, McAuley, W, Read, P, Gonzalo-Skok, O, Lake, J, and Turner, A. Acute effect of repeated sprints on interlimb asymmetries during unilateral jumping. J Strength Cond Res 35(8): 2127-2132, 2021-The aim of this study was to investigate the effects of multiple repeated sprints on unilateral jump performance and interlimb asymmetries. Eighteen recreationally active men performed 3 single-leg countermovement jumps (SLCMJ) as baseline data. The repeated sprint protocol was 6 × 40 m with 20 seconds of passive rest between each sprint. This protocol was conducted 4 times, each set separated by 4 minutes of rest. Within that rest period, subjects performed one SLCMJ on each limb after 2 minutes of rest. A 1-way analysis of variance showed significant reductions (p < 0.05; effect size [ES] = -0.52 to -0.99) in jump height on both limbs after each set relative to baseline. Interlimb asymmetries increased at each time point and ranged from 7.62 to 14.67%, with significant increases in asymmetry seen after sets 3 (p = 0.046) and 4 (p = 0.002). Significant increases in sprint time were shown between sprints 1 and 6 in each set (p ≤ 0.01). A fatigue index (%) was also calculated and showed an exponential increase from 5.74% (set 1) to 13.50% (set 4), with significant differences between all sets (p < 0.001) with the exception of sets 3 and 4. Results from this study show that a 6 × 40-m repeated sprint protocol is a sufficient dose for implementing acute fatigue in recreationally active subjects. This was manifested by reductions in jump height at all time points and jump height asymmetries after the third and fourth sets. These findings indicate that jump height from unilateral jump testing may be a useful metric to use during the monitoring process in recreationally trained athletes.
毕晓普、麦考利、里德、冈萨洛-斯科克、雷克、特纳。重复冲刺对单侧跳跃中肢体不对称性的急性影响。《力量与条件研究杂志》35（8）：2127-2132，2021-本研究旨在探讨多次重复冲刺对单侧跳跃表现和肢体不对称性的影响。18 名从事休闲运动的男性进行了 3 次单腿反跳（SLCMJ）作为基线数据。重复冲刺方案为 6×40m，每次冲刺之间有 20 秒的被动休息。该方案进行了 4 次，每次间隔 4 分钟休息。在这段休息时间内，受试者在休息 2 分钟后在每条腿上进行一次 SLCMJ。单向方差分析显示，与基线相比，每次重复冲刺后，两条腿的跳跃高度均显著降低（p<0.05；效应量[ES]=-0.52 至-0.99）。肢体不对称性在每个时间点都增加，范围在 7.62%至 14.67%之间，第 3 组（p=0.046）和第 4 组（p=0.002）的不对称性显著增加。在每组的每次冲刺中，冲刺时间都显示出显著增加（p≤0.01）。还计算了疲劳指数（%），从第 1 组的 5.74%（第 1 组）到第 4 组的 13.50%（第 4 组）呈指数增长，所有组之间均有显著差异（p<0.001），除第 3 组和第 4 组外。本研究结果表明，6×40m 的重复冲刺方案对有休闲运动习惯的受试者实施急性疲劳是足够的。这表现在所有时间点的跳跃高度降低，以及第三和第四组后的跳跃高度不对称性。这些发现表明，单侧跳跃测试的跳跃高度可能是在休闲训练运动员的监测过程中有用的指标。
