Hicks Dylan S, Drummond Claire, Williams Kym J
Exercise Science, Flinders University, SHAPE Research Center, Bedford Park, Australia.
J Strength Cond Res. 2022 Dec 1;36(12):3290-3300. doi: 10.1519/JSC.0000000000004144. Epub 2021 Oct 15.
Hicks, DS, Drummond, C, and Williams, KJ. Measurement agreement between Samozino's method and force plate force-velocity profiles during barbell and hexbar countermovement jumps. J Strength Cond Res 36(12): 3290-3300, 2022-This study aimed to measure agreement between using Samozino's method and force plates to determine mean force, velocity, and power during unloaded and loaded barbell and hexbar countermovement jumps. Twenty-one subjects performed countermovement jumps against incremental loads using both loading conditions. Ground reaction force was recorded using a dual-force plate system (1,000 Hz) and used as the criterion method to compare with Samozino's method. Reliability and validity was determined by intraclass correlation coefficients (ICCs), coefficient of variation (CV), limits of agreement plots, and least products regression analysis. Samozino's method provided acceptable levels of reliability for mean force, velocity, and power (ICC > 0.90, CV% < 5.5) across both loading conditions. Limits of agreement analysis showed the mean bias was 2.7, 15.4, and 7.2% during barbell countermovement jumps and 1.8, 12.4, and 5.0% during hexbar countermovement jumps for mean force, velocity, and power, respectively. Based on these findings, Samozino's method not only is reliable when measuring mean force, velocity, and power during loaded and unloaded barbell and hexbar countermovement jumps but also identifies limitations regarding concurrent validity compared with the gold standard. Across loading conditions, Samozino's method overestimated mean force (0.5-4.5%) and underestimated mean velocity (11.81-16.78%) and mean power (2.26-7.85%) compared with the force plates. Because of fixed and proportional bias between criterion and predictor, the results do not support the use of Samozino's method to measure mean force, velocity, and power. Therefore, it is not recommended for practitioners to use Samozino's method to estimate mechanical variables during loaded and unloaded countermovement jump actions using a barbell and hexbar.
希克斯、DS、德拉蒙德、C和威廉姆斯、KJ。在杠铃和六角杠铃下蹲跳过程中，萨莫齐诺方法与测力台力-速度曲线之间的测量一致性。《力量与体能研究杂志》36(12): 3290 - 3300, 2022 - 本研究旨在测量在无负荷和有负荷的杠铃及六角杠铃下蹲跳过程中，使用萨莫齐诺方法和测力台确定平均力、速度和功率之间的一致性。21名受试者在两种负荷条件下针对递增负荷进行下蹲跳。使用双测力台系统（1000赫兹）记录地面反作用力，并将其用作与萨莫齐诺方法进行比较的标准方法。通过组内相关系数（ICC）、变异系数（CV）、一致性界限图和最小乘积回归分析来确定可靠性和有效性。在两种负荷条件下，萨莫齐诺方法在平均力、速度和功率方面均提供了可接受的可靠性水平（ICC > 0.90，CV% < 5.5）。一致性界限分析表明，在杠铃下蹲跳过程中，平均力、速度和功率的平均偏差分别为2.7%、15.4%和7.2%；在六角杠铃下蹲跳过程中，分别为1.8%、12.4%和5.0%。基于这些发现，萨莫齐诺方法不仅在测量有负荷和无负荷的杠铃及六角杠铃下蹲跳过程中的平均力、速度和功率时可靠，而且与金标准相比，还确定了其在同时效度方面的局限性。在所有负荷条件下，与测力台相比，萨莫齐诺方法高估了平均力（0.5 - 4.5%），低估了平均速度（11.81 - 16.78%）和平均功率（2.26 - 7.85%）。由于标准方法和预测方法之间存在固定和比例偏差，结果不支持使用萨莫齐诺方法来测量平均力、速度和功率。因此，不建议从业者使用萨莫齐诺方法来估计在使用杠铃和六角杠铃进行有负荷和无负荷下蹲跳动作时的力学变量。
