Johnston William, Dolan Kara, Reid Niamh, Coughlan Garrett F, Caulfield Brian
Insight Centre for Data Analytics, University College Dublin, Ireland; School of Public Health, Physiotherapy and Sports Science, University College Dublin, Ireland.
Insight Centre for Data Analytics, University College Dublin, Ireland; School of Public Health, Physiotherapy and Sports Science, University College Dublin, Ireland.
J Sci Med Sport. 2018 Jan;21(1):103-108. doi: 10.1016/j.jsams.2017.06.007. Epub 2017 Jun 8.
The Y Balance Test is one of the most commonly used dynamic balance assessments, providing an insight into the integration of the sensorimotor subsystems. In recent times, there has been an increase in interest surrounding it's use in various clinical populations demonstrating alterations in motor function. Therefore, it is important to examine the effect physiological influences such as fatigue play in dynamic postural control, and establish a timeframe for its recovery.
Descriptive laboratory study.
Twenty male and female (age 23.75±4.79years, height 174.12±8.45cm, mass 69.32±8.76kg) partaking in competitive sport, completed the Y Balance Test protocol at 0, 10 and 20min, prior to a modified 60s Wingate fatiguing protocol. Post-fatigue assessments were then completed at 0, 10 and 20 min post-fatiguing intervention.
Intraclass correlation coefficients demonstrated excellent intra-session reliability (0.976-0.982) across the three pre-fatigue YBT tests. Post-hoc paired sample t-tests demonstrated that all three reach directions demonstrated statistically significant differences between pre-fatigue and the first post-fatigue measurement (anterior; p=0.019, posteromedial; p=0.019 & posterolateral; p=0.003). The anterior reach direction returned to pre-fatigue levels within 10min (p=0.632). The posteromedial reach direction returned to pre-fatigue levels within 20min (p=0.236), while the posterolateral direction maintained a statistically significant difference at 20min (p=0.023).
Maximal anaerobic fatigue has a negative effect on normalised Y balance test scores in all three directions. Following the fatiguing protocol, dynamic postural control returns to pre-fatigue levels for the anterior (<10min), posteromedial (<20min) and posterolateral (>20min).
Y平衡测试是最常用的动态平衡评估方法之一，可深入了解感觉运动子系统的整合情况。近年来，围绕其在各种运动功能发生改变的临床人群中的应用，人们的兴趣日益浓厚。因此，研究疲劳等生理影响因素在动态姿势控制中的作用，并确定其恢复的时间框架非常重要。
描述性实验室研究。
20名男性和女性（年龄23.75±4.79岁，身高174.12±8.45厘米，体重69.32±8.76千克）参与竞技运动，在进行改良的60秒温盖特疲劳测试前的0、10和20分钟完成Y平衡测试方案。疲劳干预后，在疲劳干预后的0、10和20分钟完成疲劳后评估。
组内相关系数表明，在三次疲劳前的YBT测试中，会话内可靠性极佳（0.976 - 0.982）。事后配对样本t检验表明，所有三个伸展方向在疲劳前和第一次疲劳后测量之间均显示出统计学上的显著差异（前侧；p = 0.019，后内侧；p = 0.019，后外侧；p = 0.003）。前侧伸展方向在10分钟内恢复到疲劳前水平（p = 0.632）。后内侧伸展方向在20分钟内恢复到疲劳前水平（p = 0.236），而后外侧方向在20分钟时仍保持统计学上的显著差异（p = 0.023）。
最大无氧疲劳对所有三个方向的标准化Y平衡测试分数均有负面影响。在疲劳测试方案后，动态姿势控制在前侧（<10分钟）、后内侧（<20分钟）和后外侧（>20分钟）恢复到疲劳前水平。
