Abstract：
UNASSIGNED: Pexa, BS, Johnston, CD, Elder, EE, Ford, KR, Patterson, MQ, and Myers, JB. Pool-based surfboard elicits activation of posterior shoulder muscles during a surfing stroke. J Strength Cond Res 38(7): 1300-1304, 2024-Surfboard paddling may activate posterior shoulder muscles, which are critical to baseball pitchers\' injury risk and performance. The purpose of this study was to measure posterior shoulder muscle activation during different phases of the surf stroke (propulsion vs. recovery) on a pool-based surfboard. Twenty healthy active adult subjects completed a familiarization and testing session with the pool-based surfboard. During the testing session, electromyography (EMG) sensors were placed on 6 posterior shoulder muscles: latissimus dorsi, infraspinatus, posterior deltoid, upper trapezius, middle trapezius, and lower trapezius. Subjects completed 4 laps in a pool at 3 separate resistances (low, moderate, and heavy) in a randomized order. The peak EMG signal during each phase (propulsion and recovery) was recorded. A 2-way within subject ANOVA (resistance-by-phase) with post hoc Bonferroni\'s corrections was used to identify differences in EMG activation. There was a significant main effect of phase for the latissimus dorsi (F = 91.3, p < 0.001), upper trapezius (F = 36.5, p < 0.001), middle trapezius (F = 33.8, p < 0.001), and lower trapezius (F = 21.6, p < 0.001). The latissimus dorsi demonstrated higher activation during the propulsion phase (p < 0.001), and all trapezius muscles demonstrated higher activation during the recovery phase (p < 0.001). There was a significant main effect of resistance for the posterior deltoid (F = 3.4, p = 0.043), with higher muscle activation in the low resistance trials compared with the heavy resistance trials (p = 0.036). Recreationally active individuals demonstrate activation of the posterior shoulder when using a pool-based surfboard. This pool-based surfboard may be beneficial to activate the posterior musculature and may be more accessible than standard surfing to baseball athletes.
摘要：
■Pexa,BS,约翰斯顿,CD,长老,EE,福特,KR,帕特森,MQ,还有Myers,JB。基于泳池的冲浪板在冲浪过程中会引起肩后肌肉的激活。JStrengthCondRes38（7）：1300-1304，2024-冲浪板划桨可能会激活后肩部肌肉，这对棒球投手的受伤风险和表现至关重要。这项研究的目的是测量冲浪中风不同阶段的后肩肌激活（推进与恢复)在基于泳池的冲浪板上。20名健康活跃的成年受试者完成了对基于泳池的冲浪板的熟悉和测试。在测试会话期间，肌电图（EMG）传感器被放置在6个后肩肌：背阔肌，冈底,后三角肌,上斜方肌,中斜方肌,和下斜方肌。受试者在3个单独的阻力（低，中度,和重)按随机顺序。记录每个阶段（推进和恢复）期间的峰值EMG信号。使用受试者内的双向方差分析（逐相电阻）和事后Bonferroni校正来识别EMG激活的差异。相位对背阔肌具有显著的主效应(F=91.3,p<0.001),上斜方肌（F=36.5，p<0.001），中斜方肌（F=33.8，p<0.001），和下斜方肌（F=21.6，p<0.001）。背阔肌在推进阶段表现出更高的激活（p<0.001），并且所有斜方肌在恢复期表现出更高的激活(p<0.001)。后三角肌阻力有显著的主效应(F=3.4,p=0.043),与重抗性试验相比，低抗性试验中的肌肉激活更高(p=0.036)。休闲活动的个体在使用基于池的冲浪板时表现出后肩的激活。这种基于泳池的冲浪板可能有利于激活后部肌肉组织，并且比标准冲浪更容易进入棒球运动员。
