De Ste Croix Mark B A, Hughes Jonathan D, Lloyd Rhodri S, Oliver Jon L, Read Paul J
1Exercise and Sport Research Center, School of Sport and Exercise, University of Gloucestershire, Gloucester, United Kingdom; 2Youth Physical Development Unit, School of Sport, Cardiff Metropolitan University, Cardiff, United Kingdom; and 3School of Sport, Health and Applied Science, St Mary's University, London, United Kingdom.
J Strength Cond Res. 2017 Nov;31(11):3052-3058. doi: 10.1519/JSC.0000000000001715.
De Ste Croix, MBA, Hughes, JD, Lloyd, RS, Oliver, JL, and Read, PJ. Leg stiffness in female soccer players: intersession reliability and the fatiguing effects of soccer-specific exercise. J Strength Cond Res 31(11): 3052-3058, 2016-Low levels of leg stiffness and reduced leg stiffness when fatigue is present compromise physical performance and increase injury risk. The purpose of this study was to (a) determine the reliability of leg stiffness measures obtained from contact mat data and (b) explore age-related differences in leg stiffness after exposure to a soccer-specific fatigue protocol in young female soccer players. Thirty-seven uninjured female youth soccer players divided into 3 subgroups based on chronological age (under 13 [U13], under 15 [U15], and under 17 [U17] year-olds) volunteered to participate in the study. After baseline data collection, during which relative leg stiffness, contact time, and flight time were collected, participants completed an age-appropriate soccer-specific fatigue protocol (SAFT). Upon completion of the fatigue protocol, subjects were immediately retested. Intersession reliability was acceptable and could be considered capable of detecting worthwhile changes in performance. Results showed that leg stiffness decreased in the U13 year-olds, was maintained in the U15 age group, and increased in the U17 players. Contact times and flight times did not change in the U13 and U15 year-olds, but significantly decreased and increased, respectively, in the U17 age group. The data suggest that age-related changes in the neuromuscular control of leg stiffness are present in youth female soccer players. Practitioners should be aware of these discrepancies in neuromuscular responses to soccer-specific fatigue, and should tailor training programs to meet the needs of individuals, which may subsequently enhance performance and reduce injury risk.
德·斯 Croix，工商管理硕士，休斯，法学博士，劳埃德，理学硕士，奥利弗，法学硕士，以及里德，哲学博士。女子足球运动员的腿部僵硬度：不同训练阶段间的可靠性以及足球专项运动的疲劳效应。《力量与体能研究杂志》31(11): 3052 - 3058，2016年——腿部僵硬度水平较低以及疲劳时腿部僵硬度降低会损害身体表现并增加受伤风险。本研究的目的是：(a) 确定从接触垫数据获得的腿部僵硬度测量的可靠性；(b) 探讨年轻女子足球运动员在经历足球专项疲劳方案后腿部僵硬度的年龄相关差异。37名未受伤的青年女子足球运动员根据实足年龄分为3个亚组（13岁以下[U13]、15岁以下[U15]和17岁以下[U17]），自愿参与本研究。在收集基线数据期间，收集了相对腿部僵硬度、接触时间和飞行时间，之后参与者完成了适合其年龄的足球专项疲劳方案（SAFT）。疲劳方案完成后，立即对受试者进行重新测试。不同训练阶段间的可靠性是可接受的，并且可以认为能够检测到表现上有价值的变化。结果显示，U13岁组的腿部僵硬度降低，U15岁年龄组保持不变，U17岁球员的腿部僵硬度增加。U13岁和U15岁组的接触时间和飞行时间没有变化，但U17岁年龄组的接触时间显著减少，飞行时间显著增加。数据表明，青年女子足球运动员存在与年龄相关的腿部僵硬度神经肌肉控制变化。从业者应意识到这些对足球专项疲劳的神经肌肉反应差异，并应调整训练计划以满足个体需求，这可能随后提高表现并降低受伤风险。
