Influence of Interlimb Lean Muscle Mass Asymmetry on Countermovement Jump Neuromuscular Performance Qualities Among American Football Players.

IF 3 2区医学 Q2 SPORT SCIENCES Journal of Strength and Conditioning Research Pub Date : 2025-03-01 Epub Date: 2024-11-26 DOI:10.1519/JSC.0000000000005002

Johnathan Polletta, Kevin Leung, David Diaz, Nicole Branum, Monique Mokha

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Abstract

Abstract: Polletta, J, Leung, K, Diaz, D, Branum, N, and Mokha, M. Influence of interlimb lean muscle mass asymmetry on countermovement jump neuromuscular performance qualities among American football players. J Strength Cond Res 39(3): 325-331, 2025-Body composition is a determinant of athletic performance. The purpose of this study was to determine the influence of lower limb lean muscle mass (LMM) asymmetry on countermovement jump (CMJ) performance and kinetic asymmetry during both eccentric and concentric CMJ phases. Seventy-four American football players (age, 23.0 ± 0.9 years; height, 1.86 ± 0.07 m; mass, 104.9 ± 21.6 kg; lean body mass, 88.7 ± 12.5 kg) training for the 2024 National Football League draft underwent body composition assessment using an InBody 270 bioelectrical impedance analyzer that yielded right and left leg LMM in kg. Subjects then performed 3 CMJs on dual uniaxial force plates that allowed for the calculation of jump height (JH), reactive strength index modified (RSImod), and interlimb percentage asymmetry of peak force and impulse for eccentric and concentric phases. A paired t -test and Pearson Product-moment Correlation Coefficients calculated the difference between left and right LMM and the associations between the symmetry variables, respectively, p ≤ 0.05. Right and left leg LMM were significantly different (t(73) = 3.772, p ≤ 0.001). However, no significant relationships were found between lower limb LMM asymmetry (0.67 ± 0.67%) and any asymmetry in CMJ eccentric peak force (4.77 ± 3.75%), r (72) = 0.001, p = 0.954; eccentric deceleration impulse (5.23 ± 4.36%), r (72) = 0.158, p = 0.180; concentric peak force (2.99 ± 2.54%), r (72) = -0.70, p = 0.553; concentric impulse (3.06 ± 2.97%), r (72) = 111, p = 0.347; JH (41.8 ± 7.3 cm), r (72) = -0.205, p = 0.08; or RSImod (0.53 ± 0.14 m·s -1 ), r (72) = -0.151, p = 0.199. The magnitude of LMM asymmetry did not influence CMJ performance or asymmetry magnitude. Reducing CMJ kinetic asymmetry may require targeted programming, especially for the eccentric loading phase.

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肢间瘦肌肉质量不对称对美式橄榄球运动员反向运动跳跃神经肌肉表现素质的影响

摘要：Polletta，J，Leung，K，Diaz，D，Branum，N 和 Mokha，M.肢体间瘦肌肉质量不对称对美式橄榄球运动员反向运动跳跃神经肌肉表现质量的影响。J Strength Cond Res XX(X)：000-000，2024-身体成分是运动成绩的决定因素。本研究的目的是确定下肢瘦肌肉质量（LMM）不对称对反运动跳跃（CMJ）表现的影响，以及 CMJ 偏心和同心阶段的运动不对称。74 名美式橄榄球运动员（年龄，23.0 ± 0.9 岁；身高，1.86 ± 0.07 米；体重，104.9 ± 21.6 千克；瘦体重，88.7 ± 12.5 千克）参加了 2024 年全美橄榄球联盟选秀训练，他们使用 InBody 270 生物电阻抗分析仪进行了身体成分评估，得出了以千克为单位的左右腿瘦肌肉质量。然后，受试者在双单轴力板上进行了 3 次 CMJ，从而计算出了跳高 (JH)、修正后的反应性力量指数 (RSImod)，以及偏心和同心阶段的峰值力和冲量的肢间不对称百分比。配对 t 检验和皮尔逊乘积相关系数分别计算了左右腿 LMM 的差异和对称性变量之间的关联，P ≤ 0.05。左右腿 LMM 存在显著差异（t(73) = 3.772，p ≤ 0.001）。然而，下肢 LMM 不对称（0.67 ± 0.67%）与 CMJ 偏心峰值力（4.77 ± 3.75%），r(72) = 0.001，p = 0.954；偏心减速冲量（5.23 ± 4.36%），r(72) = 0.158，p = 0.180；同心峰值力（2.99 ± 2.54%），r(72) = -0.70，p = 0.553；同心冲量（3.06 ± 2.97%），r(72) = 111，p = 0.347；JH（41.8 ± 7.3 cm），r(72) = -0.205，p = 0.08；或 RSImod（0.53 ± 0.14 m-s-1），r(72) = -0.151，p = 0.199。LMM 不对称的程度并不影响 CMJ 成绩或不对称程度。减少 CMJ 运动不对称可能需要有针对性的训练，尤其是在偏心负荷阶段。

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来源期刊

Journal of Strength and Conditioning Research 社会科学-运动科学

CiteScore

6.70

自引率

9.40%

发文量

384

审稿时长

3 months

期刊介绍： The editorial mission of The Journal of Strength and Conditioning Research (JSCR) is to advance the knowledge about strength and conditioning through research. A unique aspect of this journal is that it includes recommendations for the practical use of research findings. While the journal name identifies strength and conditioning as separate entities, strength is considered a part of conditioning. This journal wishes to promote the publication of peer-reviewed manuscripts which add to our understanding of conditioning and sport through applied exercise science.