Karatsolis K, Nikolopoulos C S, Papadopoulos E S, Vagenas G, Terzis E, Athanasopoulos S
Laboratory of Sports Physiotherapy, Department of Physical Education and Sports Science, University of Athens, Greece.
Foot (Edinb). 2009 Mar;19(1):29-35. doi: 10.1016/j.foot.2008.06.006. Epub 2008 Nov 7.
Excessive subtalar pronation causes significant changes in the biomechanics of the lower leg, adversely influences proprioceptive feedback and neuromuscular reflex behavior and consequently, affects stability of the foot. However, the changes in muscle strength, caused by hyperpronation are unclear.
The purpose of the present study was to compare the evertor and invertor peak torque between hyperpronated and normal individuals as well as between their dominant and non-dominant foot.
20 healthy male participants volunteered for this study. Leg dominance was assessed on the basis of a questionnaire and navicular drop measurements were used to classify participants into two groups: hyperpronated (> or =10 mm) and normals (5-9 mm). Isokinetic concentric eversion and inversion muscle group strength was tested at 30 degrees and 120 degrees/s using the Con-Trex MJ isokinetic dynamometer.
In all cases, inversion peak torque was greater than eversion peak torque and declined with increasing angular velocity. No significant differences were found for inversion and eversion concentric strength at both speeds tested, neither between normal and hyperpronated individuals neither between their dominant and non-dominant foot.
These results indicate the need re-evaluation of navicular drop values in order to identify normal and abnormal subtalar pronation. The assessment of eccentric contractions is also proposed when examining invertors and evertors isokinetic strength.
距下关节过度旋前会导致小腿生物力学发生显著变化，对本体感觉反馈和神经肌肉反射行为产生不利影响，进而影响足部稳定性。然而，旋前过度引起的肌肉力量变化尚不清楚。
本研究旨在比较旋前过度者与正常个体之间以及优势足与非优势足之间的外翻肌和内翻肌峰值扭矩。
20名健康男性参与者自愿参加本研究。根据问卷评估腿的优势情况，并通过舟骨下落测量将参与者分为两组：旋前过度组（≥10毫米）和正常组（5 - 9毫米）。使用Con - Trex MJ等速测力计在30度/秒和120度/秒的速度下测试等速向心外翻和内翻肌群力量。
在所有情况下，内翻峰值扭矩均大于外翻峰值扭矩，且随角速度增加而下降。在测试的两种速度下，无论是正常个体与旋前过度个体之间，还是优势足与非优势足之间，内翻和外翻向心力量均未发现显著差异。
这些结果表明需要重新评估舟骨下落值，以确定正常和异常的距下关节旋前情况。在检查内翻肌和外翻肌等速力量时，也建议评估离心收缩。
