Mangine Gerald T, McNabb Jacob A, Feito Yuri, VanDusseldorp Trisha A, Hester Garrett M
Exercise Science and Sport Management, Kennesaw State University, Kennesaw, Georgia.
J Strength Cond Res. 2021 Nov 1;35(11):3076-3083. doi: 10.1519/JSC.0000000000003293.
Mangine, GT, McNabb, JA, Feito, Y, VanDusseldorp, TA, and Hester, GM. Increased resisted sprinting load decreases bilateral asymmetry in sprinting kinetics among rugby players. J Strength Cond Res 35(11): 3076-3083, 2021-To examine the effect of resistance on sprinting kinetics and their bilateral symmetry, 15 male collegiate rugby players completed 3 maximal, 40-m sprints (S1-S3) while tethered to a robotic resistance device. Minimal resistance (9.81 N) was used on S1 (familiarization) and S2, while S3 was loaded at 147.1 N. Peak and average (AVG) power (P), velocity (V), force (F), and rate of force development (RFD) were averaged within the first stride, the acceleration and peak velocity phases, as well as across the 40-m sprint. Bilateral percent differences were calculated from step values within each stride for each variable. Friedman's rank tests revealed differences (p ≤ 0.02) between sprint trials and phases for each variable. During both trials, most kinetic measures increased from the first stride through the peak velocity phase (p ≤ 0.036), although reductions in RFDPEAK (p ≤ 0.015) and RFDAVG (S3 only; p < 0.001) were observed within the peak velocity phase. Comparatively, sprinting velocity and average stride (length and duration) were less during S3, while all other measures were greater within each phase. Across the entire 40-m sprint, S3 reduced (p < 0.05) asymmetry for average stride length (-2.1 to -17.0%), VPEAK (-0.8 to -4.9%), VAVG (-2.3 to -6.0%), FPEAK (-5.6 to -8.7%), FAVG (-3.4 to -7.1%), RFDPEAK (-4.3 to -36.7%), PPEAK (-5.9 to -12.4%), and PAVG (-5.4 to -9.8%). Applying sprinting resistance may be a tool for reducing acute bilateral asymmetries in sprinting kinetic measures.
曼金尼、GT、麦克纳布、JA、费托、Y、范杜塞尔多普、TA和赫斯特、GM。增加阻力冲刺负荷可减少橄榄球运动员冲刺动力学中的双侧不对称性。《力量与体能研究杂志》35(11): 3076 - 3083，2021年 - 为研究阻力对冲刺动力学及其双侧对称性的影响，15名男性大学橄榄球运动员在与机器人阻力装置相连的情况下完成了3次40米最大冲刺（S1 - S3）。S1（熟悉阶段）和S2使用最小阻力（9.81牛），而S3的负荷为147.1牛。在第一步、加速和峰值速度阶段以及整个40米冲刺过程中，对峰值和平均（AVG）功率（P）、速度（V）、力（F）和力发展速率（RFD）进行平均。根据每个步幅内每个变量的步幅值计算双侧百分比差异。弗里德曼秩和检验揭示了每个变量在冲刺试验和阶段之间的差异（p≤0.02）。在两次试验中，大多数动力学指标从第一步到峰值速度阶段都有所增加（p≤0.036），尽管在峰值速度阶段观察到RFDPEAK（p≤0.015）和RFDAVG（仅在S3中；p < 0.001）有所降低。相比之下，S3期间的冲刺速度和平均步幅（长度和持续时间）较小，而每个阶段内的所有其他指标都较大。在整个40米冲刺过程中，S3降低了（p < 0.05）平均步幅长度（-2.1%至-17.0%）、VPEAK（-0.8%至-4.9%）、VAVG（-2.3%至-6.0%）、FPEAK（-5.6%至-8.7%）、FAVG（-3.4%至-7.1%）、RFDPEAK（-4.3%至-36.7%）、PPEAK（-5.9%至-12.4%）和PAVG（-5.4%至-9.8%）的不对称性。施加冲刺阻力可能是减少冲刺动力学测量中急性双侧不对称性的一种工具。
