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Changes in the Ground Reaction Force, Lower-Limb Muscle Activity, and Joint Angles in Athletes with Unilateral Ankle Dorsiflexion Restriction During A Rebound-Jump Task

1
Physical Therapy, Department of Rehabilitation, Fukui College of Health Sciences, 55 Egami-cho 13-1, Fukui 910-3190, Japan
2
Physical Therapy, Department of Rehabilitation, Faculty of Health Science, Fukui Health Science University, 55 Egami-cho 13-1, Fukui 910-3190, Japan
J. Funct. Morphol. Kinesiol. 2018, 3(4), 52; https://doi.org/10.3390/jfmk3040052
Received: 22 August 2018 / Revised: 19 October 2018 / Accepted: 23 October 2018 / Published: 26 October 2018
(This article belongs to the Section Kinesiology and Biomechanics)
Background: This study compared differences between a control group and a group with unilateral ankle dorsiflexion restriction in the ground reaction force (GRF), angles of the lower limbs joints, and muscular activity during a rebound-jump task in athletes who continue to perform sports activities with unilateral ankle dorsiflexion restriction. Methods: The athletes were divided into the following two groups: The dorsiflexion group included those with a difference of ≥7° between bilateral ankle dorsiflexion angles (DF), and the control group included those with a difference of <7° between the two ankles (C). An ankle foot orthosis was attached to subjects in group C to apply a restriction on the right-angle dorsiflexion angle. The percentage of maximum voluntary contraction (%MVC) of the legs musculature, components of the GRF, and the hip and knee joint angles during the rebound-jump task were compared between groups DF and C. Results: Group DF showed increased %MVC of the quadriceps muscle, decreased upward component of the GRF, decreased hip flexion, and increased knee eversion angles. Conclusions: This study highlighted that athletes with ankle dorsiflexion restriction had significantly larger knee eversion angles in the rebound-jump task. The reduced hip flexion was likely caused by the restricted ankle dorsiflexion and compensated by the observed increase in quadriceps muscle activation when performing the jump. View Full-Text
Keywords: ankle dorsiflexion restriction; rebound-jump; muscle activity; hip joint flexion angle; ground reaction force ankle dorsiflexion restriction; rebound-jump; muscle activity; hip joint flexion angle; ground reaction force
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Kondo, H. Changes in the Ground Reaction Force, Lower-Limb Muscle Activity, and Joint Angles in Athletes with Unilateral Ankle Dorsiflexion Restriction During A Rebound-Jump Task. J. Funct. Morphol. Kinesiol. 2018, 3, 52.

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