Ahmadi Mehdi, Nodehi Moghadam Afsun, Bakhshi Majid, Rezaeian Tahere, Pahnabi Gholamreza
Department of Physical Therapy, School of Medicine, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.
Department of Corrective Exercises and Pathology, University of Shahrekord, Shahrekord, Iran.
Med J Islam Repub Iran. 2017 Dec 20;31:112. doi: 10.14196/mjiri.31.112. eCollection 2017.
The ability to maintain body position in space is called postural control. Muscular fatigue created after doing voluntary repeated contractions impairs postural control. Thus, the present study was conducted to compare the effects of fatigue of the lumbar extensor muscles and duration of these effects on postural sway between soccer player and non-athlete participants. A total of 15 male soccer players and 15 male non-athletes participated in this cross- sectional study. Lumbar extensor fatigue is produced by a dynamometer and maintains 60% of the maximum voluntary isometric contraction in standing position. The mean velocity and the total area of the participants were evaluated using force plate at baseline, immediately, 3, 6, and 9 minutes after fatigue and compared between the 2 groups. Descriptive statistics, repeated measurement ANOVA, and independent t test were used for data analysis. The results demonstrated that fatigue of the waist extensor muscles affects the postural sway (p= 0.001). Also, the total area level was recovered earlier than the mean velocity after fatigue. The results revealed that total area and velocity with eyes closed decreased in the soccer player group compared with the non-athlete group. Lumbar extensors fatigue significantly changed the mean velocity and the total area in soccer players and non-athletes. Lumbar fatigue had more effects on the total area than the mean velocity in the two groups.
在空间中维持身体姿势的能力称为姿势控制。进行自愿重复收缩后产生的肌肉疲劳会损害姿势控制。因此，本研究旨在比较足球运动员和非运动员参与者中腰伸肌疲劳的影响以及这些影响对姿势摆动持续时间的影响。共有15名男性足球运动员和15名男性非运动员参与了这项横断面研究。通过测力计产生腰伸肌疲劳，并在站立位维持最大自主等长收缩的60%。在基线、疲劳后即刻、3分钟、6分钟和9分钟时使用测力台评估参与者的平均速度和总面积，并在两组之间进行比较。描述性统计、重复测量方差分析和独立t检验用于数据分析。结果表明，腰伸肌疲劳会影响姿势摆动（p = 0.001）。此外，疲劳后总面积水平比平均速度恢复得更早。结果显示，与非运动员组相比，足球运动员组闭眼时的总面积和速度降低。腰伸肌疲劳显著改变了足球运动员和非运动员的平均速度和总面积。在两组中，腰部疲劳对总面积的影响比对平均速度的影响更大。
