Athletic Training Program, Movement Science, Sport and Leisure Studies, Westfield State University, Westfield, Massachusetts.
Physical Therapy Program, Department of Kinesiology Colorado Mesa University; and.
J Strength Cond Res. 2021 Apr 1;35(4):920-923. doi: 10.1519/JSC.0000000000003277.
Cacolice, PA, Carcia, CR, and Scibek, JS. Shoulder flexion torque is augmented by a volitional abdominal isometric contraction. J Strength Cond Res 35(4): 920-923, 2021-A stable core provides a solid base to facilitate effective extremity function. It is unclear whether an individual is able to produce a greater amount of upper extremity torque while performing a volitional core contraction when compared with the independent contraction that occurs subconsciously. Therefore, the purpose of this study was to determine whether peak shoulder flexion torque values were different with and without a concurrent volitional core isometric contraction. Thirty healthy, recreationally active college-aged students participated. Surface electromyography from the rectus abdominis (RA) was captured using a telemetry system interfaced with a software acquisition system and personal computer. In a counterbalanced alternating order, subjects completed 3 trials of maximal isometric shoulder flexion at 90° with and without a volitional abdominal contraction. Percent activation of the RA was greater when subjects volitionally contracted their core (15.8 ± 12.7%) compared with the subconscious contracted condition (6.3 ± 4.8%) (p ≤ 0.001). Isometric shoulder flexion peak torque was greater when the core was actively contracted (44.6 ± 18.9 N × m) compared with when the core was recruited subconsciously (30.7 ± 15.7 N × m) (p ≤ 0.001). These findings suggest the clinician should encourage the individual to activate their core musculature when performing upper extremity strength activities.
卡科利奇、PA、加西亚、CR 和希贝克、JS。主动腹部等长收缩可增强肩部前屈扭矩。《力量与体能研究杂志》35（4）：920-923，2021-稳定的核心为促进有效的四肢功能提供了坚实的基础。目前尚不清楚与下意识的独立收缩相比，个体在进行主动核心收缩时是否能够产生更大的上肢扭矩。因此，本研究的目的是确定在有无同时进行主动核心等长收缩的情况下，峰值肩部前屈扭矩值是否不同。30 名健康、有规律参加体育活动的大学生参与了研究。使用遥测系统与软件采集系统和个人计算机接口，从腹直肌（RA）获取表面肌电图。在平衡交替的顺序下，受试者在 90°进行了 3 次最大等长肩部前屈试验，同时进行和不进行主动腹部收缩。当受试者主动收缩核心时，RA 的激活百分比（15.8±12.7%）高于潜意识收缩时（6.3±4.8%）（p≤0.001）。当核心主动收缩时，等长肩部前屈峰值扭矩（44.6±18.9 N×m）大于当核心下意识收缩时（30.7±15.7 N×m）（p≤0.001）。这些发现表明，临床医生在进行上肢力量活动时应鼓励患者主动收缩核心肌群。
