Tredrea Matthew S J, Middleton Kane J, Bourne Matthew N, Carey David L, Scanlan Aaron T, Dascombe Ben J
Discipline of Sport and Exercise Science, School of Allied Health, Human Services and Sport, La Trobe University, Bundoora, Victoria, Australia.
Discipline of Exercise and Sports Science, School of Science and Technology, University of New England, Armidale, New South Wales, Australia.
J Strength Cond Res. 2022 Apr 1;36(4):1084-1089. doi: 10.1519/JSC.0000000000003738.
Tredrea, MSJ, Middleton, KJ, Bourne, MN, Carey, DL, Scanlan, AT, and Dascombe, BJ. Load centralization does not affect the kinetic and kinematic output of countermovement jumps. J Strength Cond Res 36(4): 1084-1089, 2022-This study aimed to compare the kinetics, kinematics, and performance of countermovement jumps (CMJs) when completed with 2 different loading conditions (centralized or peripheral) across increasing loads. Seventeen subjects (12 men and 5 women) randomly completed 2 series of CMJs with increasing loads separated by a 30-minute rest period between conditions. Subjects were loaded with either a weighted vest (centralized) or straight barbell (peripheral). A randomized, counterbalanced crossover design was used with incremental loads of 10, 20, 30, 40, and 50% of body mass added to the vest or barbell. Measures of peak force, acceleration, velocity, and power were calculated across each subphase of the CMJs. No significant differences were observed in kinetic or kinematic variables between loading conditions. Within each condition there were significant reductions (p < 0.05) in peak concentric velocity and acceleration, as well as significant increases (p < 0.05) in peak force when the external load increased. Furthermore, braking and propulsive phase duration significantly increased (p < 0.05) and jump height significantly decreased (p < 0.05) as the external load increased. Countermovement jump performance was similar in both central and peripheral loading, whereas increasing load significantly affected jump height, force, velocity, and acceleration variables irrespective of load position. The training stimulus from an external load placed centrally or peripherally is similar regardless of where it is positioned; however, from a practical perspective, a weighted vest may provide a more mobile and safer alternative than a barbell.
特雷德雷、MSJ、米德尔顿、KJ、伯恩、MN、凯里、DL、斯坎伦、AT和达斯combe、BJ。负荷集中化不影响反向运动跳跃的动力学和运动学输出。《力量与体能研究杂志》36(4):1084 - 1089，2022年——本研究旨在比较在不同负荷增加情况下，在两种不同负荷条件（集中或周边）下完成反向运动跳跃（CMJ）时的动力学、运动学和表现。17名受试者（12名男性和5名女性）随机完成两组随着负荷增加的CMJ，两组之间有30分钟的休息时间。受试者分别穿着加重背心（集中负荷）或直杠铃（周边负荷）。采用随机、平衡交叉设计，在背心上或杠铃上增加相当于体重10%、20%、30%、40%和50%的递增负荷。计算CMJ每个子阶段的峰值力、加速度、速度和功率。在负荷条件之间，未观察到动力学或运动学变量有显著差异。在每种条件下，随着外部负荷增加，向心峰值速度和加速度显著降低（p < 0.05），峰值力显著增加（p < 0.05）。此外，随着外部负荷增加，制动和推进阶段持续时间显著增加（p < 0.05），跳跃高度显著降低（p < 0.05）。中央和周边负荷下的反向运动跳跃表现相似，而无论负荷位置如何，负荷增加均显著影响跳跃高度、力量、速度和加速度变量。无论外部负荷置于中央还是周边，其训练刺激相似；然而，从实际角度来看，加重背心可能比杠铃提供更灵活、更安全的选择。
