Rosemeyer James R, Hayes Bradley T, Switzler Craig L, Hicks-Little Charlie A
Sports Medicine Dept, University of South Carolina, Columbia, SC.
J Sport Rehabil. 2015 Nov;24(4):384-90. doi: 10.1123/jsr.2014-0216. Epub 2015 Feb 6.
Core stability has been shown to affect lower-extremity motion, but activation of the core has also been observed just before movements of the upper extremity. However, there is limited evidence regarding the effects that core musculature has on upper-extremity strength.
To determine the effects of core fatigue on maximal shoulder strength.
Crossover study.
Sports-medicine research laboratory.
23 participants (15 male and 8 female, age 21.3 ± 2.5 y, height 174.5 ± 10.3 cm, weight 71.3 ± 12.0 kg).
All participants performed maximal voluntary isometric contractions in 3 different planes (sagittal, frontal, transverse) of shoulder-joint motion. A core-fatiguing protocol was conducted, and the same 3 shoulder-strength tests were repeated and compared with the initial measurements.
Strength measures were recorded in kilograms with a dynamometer.
Results showed a significant decrease in strength in the frontal (-0.56 ± 1.06 kg, P = .020) and transverse (-0.89 ± 1.49 kg, P = .012) planes but not in the sagittal plane (-0.20 ± 0.98 kg, P > .05). Furthermore, regardless of the specific strength test measured, results revealed that the 1st (-7.05% ± 11.65%, P = .012) and 2nd (-5.71% ± 12.03%, P = .042) strength-test measurements after the fatiguing protocol were significantly decreased, while the 3rd strength-test measurement (-4.19% ± 12.48%, P = .140) did not show statistical significance.
These results indicate that decrease in core stability may have an influence on shoulder strength. The literature suggests that the core is designed for endurance, and this study helps validate its recovery properties. Further research is needed to determine the significance of this effect and how injury rates coincide.
已有研究表明核心稳定性会影响下肢运动，但在上肢运动之前也观察到了核心的激活。然而，关于核心肌肉组织对上肢力量影响的证据有限。
确定核心疲劳对最大肩部力量的影响。
交叉研究。
运动医学研究实验室。
23名参与者（15名男性和8名女性，年龄21.3±2.5岁，身高174.5±10.3厘米，体重71.3±12.0千克）。
所有参与者在肩关节运动的3个不同平面（矢状面、额状面、横断面）进行最大自主等长收缩。实施一项使核心疲劳的方案，然后重复相同的3项肩部力量测试，并与初始测量结果进行比较。
使用测力计以千克为单位记录力量测量值。
结果显示，在额状面（-0.56±1.06千克，P = 0.0220）和横断面（-0.89±1.49千克，P = 0.012）力量显著下降，但在矢状面（-0.20±0.98千克，P>0.05）没有下降。此外，无论测量的是哪种特定力量测试，结果都显示，疲劳方案后的第一次（-7.05%±11.65%，P = 0.012）和第二次（-5.71%±12.03%，P = 0.042）力量测试测量值显著下降，而第三次力量测试测量值（-4.19%±12.48%，P = 0.140）没有统计学意义。
这些结果表明，核心稳定性的下降可能会对肩部力量产生影响。文献表明，核心是为耐力而设计的，本研究有助于验证其恢复特性。需要进一步研究以确定这种影响的重要性以及损伤发生率如何与之相符。
