Abstract：
UNASSIGNED: Techmanski, BS, Kissick, CR, Loturco, I, and Suchomel, TJ. Using barbell acceleration to determine the 1 repetition maximum of the jump shrug. J Strength Cond Res 38(8): 1486-1493, 2024-The purpose of this study was to determine the 1 repetition maximum (1RM) of the jump shrug (JS) using the barbell acceleration characteristics of repetitions performed with relative percentages of the hang power clean (HPC). Fifteen resistance-trained men (age = 25.5 ± 4.5 years, body mass = 88.5 ± 15.7 kg, height = 176.1 ± 8.5 cm, relative 1RM HPC = 1.3 ± 0.2 kg·kg-1) completed 2 testing sessions that included performing a 1RM HPC and JS repetitions with 20, 40, 60, 80, and 100% of their 1RM HPC. A linear position transducer was used to determine concentric duration and the percentage of the propulsive phase (P%) where barbell acceleration was greater than gravitational acceleration (i.e., a>-9.81 m·s-2). Two 1 way repeated measures ANOVA were used to compare each variable across loads, whereas Hedge\'s g effect sizes were used to examine the magnitude of the differences. Concentric duration ranged from 449.7 to 469.8 milliseconds and did not vary significantly between loads (p = 0.253; g = 0.20-0.39). The P% was 57.4 ± 7.2%, 64.8 ± 5.9%, 73.2 ± 4.3%, 78.7 ± 4.0%, and 80.3 ± 3.5% when using 20, 40, 60, 80, and 100% 1RM HPC, respectively. P% produced during the 80 and 100% 1RM loads were significantly greater than those at 20, 40, and 60% 1RM (p < 0.01, g = 1.30-3.90). In addition, P% was significantly greater during 60% 1RM compared with both 20 and 40% 1RM (p < 0.01, g = 1.58-2.58) and 40% was greater than 20% 1RM (p = 0.003, g = 1.09). A braking phase was present during each load and, thus, a 1RM JS load was not established. Heavier loads may be needed to achieve a 100% propulsive phase when using this method.
摘要：
■Techmanski,BS,Kissick,CR,Loturco,I,还有Suchomel,TJ使用杠铃加速度来确定跳跃耸肩的1个重复最大值。JStrengthCondRes38（8）：1486-1493，2024-这项研究的目的是使用以相对百分比执行的重复的杠铃加速度特性来确定跳跃耸肩（JS）的1次重复最大值（1RM）悬挂功率清洁（HPC）。15名抵抗训练的男性（年龄=25.5±4.5岁，体重=88.5±15.7kg，高度=176.1±8.5厘米，相对1RMHPC=1.3±0.2kg·kg-1）完成了2个测试会话，其中包括执行1RMHPC和JS重复，其中1RMHPC的20、40、60、80和100％。线性位置传感器用于确定同心持续时间和推进阶段的百分比（P％），其中杠铃加速度大于重力加速度（即，a>-9.81m·s-2)。使用两个单向重复测量方差分析来比较不同负载的每个变量，而Hedge的g效应大小用于检查差异的大小。同心持续时间为449.7至469.8毫秒，并且在负载之间没有显着变化（p=0.253；g=0.20-0.39）。P%为57.4±7.2%,64.8±5.9%，73.2±4.3%,78.7±4.0%,使用20、40、60、80和100%1RMHPC时，为80.3±3.5%，分别。在80％和100％1RM载荷下产生的P％显着大于在20％、40％和60％1RM下产生的P％（p<0.01，g=1.30-3.90）。此外,与20和40％1RM相比，60％1RM期间的P％显着增加（p<0.01，g=1.58-2.58），而40％大于20％1RM（p=0.003，g=1.09）。在每个负载期间都存在一个制动阶段，因此，未建立1RMJS加载。当使用该方法时,可能需要更重的载荷来实现100%推进阶段。
