Department of Physical Therapy, University of Illinois at Chicago, Chicago, Illinois.
J Strength Cond Res. 2023 Sep 1;37(9):1860-1864. doi: 10.1519/JSC.0000000000004477. Epub 2023 Jan 24.
Gagnon, A, Payette, J, Park, M, Juras, K, and Slater, L. Relationship between pitch counts and shoulder strength in collegiate baseball players. J Strength Cond Res 37(9): 1860-1864, 2023-Large volumes of throwing leads to changes in shoulder strength that have been associated with increased risk of injury. The purpose of this study was to investigate the relationship between throwing volume and eccentric shoulder strength. Twelve NCAA Division I baseball pitchers volunteered to participate. Prepractice and postpractice eccentric shoulder strength was measured using a handheld dynamometer at 30°/second. Change in strength was calculated as the prepractice strength measure subtracted from the postpractice strength measure. After initial testing, subjects self-reported pitch counts before completing postpractice strength testing. Subjects were separated into high-strength and low-strength groups based on the median external rotation strength. Paired t -tests were used to compare change in shoulder strength and Pearson's r correlations were used to quantify the association between pitches and change in strength. There were no changes between prestrength and poststrength assessments in external rotation strength or internal rotation strength for the entire group. When divided into strength groups, correlations between strength and total pitches were nonsignificant for the high-strength group but were strong for both external rotation ( r = -0.87, p = 0.025) and internal rotation ( r = -0.91, p = 0.013) in the low-strength group. Pitchers with lower shoulder eccentric strength at baseline demonstrated greater declines in strength, whereas pitchers with higher shoulder eccentric strength did not demonstrate changes in strength. Changes in strength during practice could lead to compensatory movement that may predispose athletes to injury. Sport performance professionals may benefit from obtaining eccentric shoulder strength to assist with performance periodization and rehabilitation after injury.
甘农、A、佩耶特、J、朴、M、尤拉斯、K 和斯莱特、L. 大学生棒球运动员投球次数与肩部力量的关系。J 力量与调节研究 37(9):1860-1864,2023-大量的投掷会导致肩部力量的变化，这些变化与受伤风险增加有关。本研究的目的是调查投掷量与离心肩部力量之间的关系。12 名 NCAA 一级棒球投手自愿参加。使用手持测力计以 30°/秒的速度测量练习前和练习后的离心肩部力量。强度变化计算为练习前强度测量值减去练习后强度测量值。初始测试后，受试者在完成练习后强度测试前自我报告投球次数。根据外部旋转强度的中位数，将受试者分为高强度和低强度组。使用配对 t 检验比较肩部力量的变化，使用 Pearson r 相关量化投球次数与力量变化之间的关联。整个组的外部旋转强度和内部旋转强度在预强度和后强度评估之间没有变化。当按强度分组时，高强度组的力量与总投球数之间的相关性不显著，但在低强度组中，外部旋转（r=-0.87，p=0.025）和内部旋转（r=-0.91，p=0.013）的相关性均很强。基线时肩部离心强度较低的投手表现出更大的力量下降，而肩部离心强度较高的投手则没有表现出力量变化。练习期间力量的变化可能导致代偿性运动，这可能使运动员容易受伤。运动表现专业人员可能受益于获得离心肩部力量，以协助运动表现分期和受伤后的康复。
