Gribble Phillip A, Tucker W Steven, White Paul A
University of Toledo, Toledo, OH 43606, USA.
J Athl Train. 2007 Jan-Mar;42(1):35-41.
Assessment of postural control is used extensively in clinical and research applications. Time of day affects aspects of physical performance, but whether it also affects postural control is unknown.
To determine the influence of time of day on static and dynamic postural control.
For each static postural control variable, a separate 3-way (day, time, eye) repeated-measures analysis of variance (ANOVA) was performed. For the dynamic postural control variable, a 2-way (day, time) repeated-measures ANOVA was performed.
University research laboratory.
Thirty healthy college-aged subjects.
INTERVENTION(S): Static and dynamic postural control of each subject was assessed in a laboratory at 10:00, 15:00, and 20:00 on 2 consecutive days.
MAIN OUTCOME MEASURE(S): Unilateral static postural control was assessed with eyes open and closed on a forceplate using center-of-pressure velocity in the anterior-posterior and medial-lateral planes as the dependent variables. Dynamic postural control was assessed with the anterior reaching direction of the Star Excursion Balance Test using reach distances normalized to leg length as the dependent variable.
For static postural control, velocity scores in both directions were lower at 10:00 than at 15:00 and 20:00 on day 1 (P < .05). For dynamic postural control, normalized reach distance was greater at 10:00 than at 15:00 and 20:00 (P < .05).
Time of day had a consistent influence on dynamic postural control that suggests performance of this task may be better in the morning than in the afternoon or evening. The influence of time of day on static postural control was not as consistent and we feel requires further investigation. These findings have implications for researchers and clinicians when implementing and interpreting postural control testing.
姿势控制评估在临床和研究应用中被广泛使用。一天中的时间会影响身体机能的各个方面，但它是否也会影响姿势控制尚不清楚。
确定一天中的时间对静态和动态姿势控制的影响。
对于每个静态姿势控制变量，进行单独的三因素（日期、时间、眼睛状态）重复测量方差分析（ANOVA）。对于动态姿势控制变量，进行双因素（日期、时间）重复测量方差分析。
大学研究实验室。
30名健康的大学生。
在连续两天的10:00、15:00和20:00在实验室对每个受试者的静态和动态姿势控制进行评估。
使用前后平面和内外侧平面的压力中心速度作为因变量，在测力平台上睁眼和闭眼时评估单侧静态姿势控制。使用归一化到腿长的伸展距离作为因变量，通过星形偏移平衡测试的前伸方向评估动态姿势控制。
对于静态姿势控制，第1天10:00时两个方向的速度得分均低于15:00和20:00时（P <.05）。对于动态姿势控制，10:00时的归一化伸展距离大于15:00和20:00时（P <.05）。
一天中的时间对动态姿势控制有一致的影响，这表明这项任务在早晨的表现可能比下午或晚上更好。一天中的时间对静态姿势控制的影响不太一致，我们认为需要进一步研究。这些发现对研究人员和临床医生在实施和解释姿势控制测试时有一定启示。
