Virginia Military Institute, Lexington, VA.
J Athl Train. 2000 Jan;35(1):26-30.
To examine the effects of orthotic intervention on unilateral postural sway after fatigue of the plantar flexor and dorsiflexor muscle groups.
Subjects were assigned to both orthotic and nonorthotic testing conditions in a counterbalanced order, then assessed for postural sway before and after isokinetic fatiguing contractions of the plantar flexors and dorsiflexors. Postural stability was measured on the motor-dominant extremity. (Motor dominance was assessed as the foot the subject used to kick a ball.)
Eleven active, healthy male subjects (mean age = 24 +/- 2.0 years, wt = 74.5 +/- 8.8 kg, ht = 180.3 +/- 8.4 cm) volunteered to participate in the study.
Center-of-pressure postural sway was assessed via the force platforms of a Chattecx Dynamic Balance System and transformed via 4 transducers as values indicative of sway in the anterior-posterior and medial-lateral directions. The dependent measure was postural sway in centimeters. Fatigue was induced by consecutive concentric plantar flexiondorsiflexion contractions on a Kin-Com II isokinetic dynamometer.
A repeated-measures analysis of variance revealed a significant orthotic-by-test interaction. Post hoc analysis with the Tukey honestly significant difference method revealed that postural sway values of the postfatigue nonorthotic condition were significantly greater when compared with the prefatigue orthotic, prefatigue nonorthotic, and postfatigue orthotic conditions.
Our results suggest that molded orthotics may be an effective means of decreasing postural sway after an isokinetic fatigue protocol. Further research is needed to determine the exact mechanism of this improvement and whether orthotics are an effective means of preventing ankle injury.
研究矫形器干预对跖屈和背屈肌群疲劳后单侧姿势摆动的影响。
受试者按平衡顺序被分配到矫形和非矫形测试条件，并在进行等速疲劳性跖屈和背屈收缩之前和之后对姿势摆动进行评估。姿势稳定性在运动优势肢体上进行测量。（运动优势是指受试者用来踢球的脚。）
11 名活跃、健康的男性受试者（平均年龄=24 +/- 2.0 岁，体重=74.5 +/- 8.8 公斤，身高=180.3 +/- 8.4 厘米）自愿参加研究。
通过 Chattex 动态平衡系统的力平台评估中心压力姿势摆动，并通过 4 个传感器转换为指示前后和左右摆动的数值。因变量为厘米级的姿势摆动。疲劳是通过在 Kin-Com II 等速测力计上进行连续的向心跖屈-背屈收缩来诱导的。
重复测量方差分析显示出矫形器与测试的显著交互作用。事后 Tukey 诚实显著差异法分析显示，与疲劳前的矫形、疲劳前的非矫形和疲劳后的矫形条件相比，疲劳后的非矫形条件下的姿势摆动值显著更大。
我们的结果表明，成型矫形器可能是减少等速疲劳方案后姿势摆动的有效方法。需要进一步研究以确定这种改善的确切机制以及矫形器是否是预防踝关节损伤的有效方法。
