Affiliation:
1. *Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan
2. †Japan Institute of Sports Sciences, Nishigaoka, Kita-ku, Tokyo
3. ‡Faculty of Health and Sport Science, University of Tsukuba, Ibaraki, Japan
Abstract
Context
Individuals with chronic ankle instability (CAI) exhibit altered movement strategies during side-cutting tasks. However, no researchers have assessed how altered movement strategies affect cutting performance.
Objective
To investigate compensatory strategies in the side-hop test (SHT), with a focus on the entire lower extremity, among individuals with CAI.
Design
Cross-sectional study.
Setting
Laboratory.
Patients or Other Participants
A total of 40 male soccer players comprising a CAI group (n = 20; age = 20.35 ± 1.15 years, height = 173.95 ± 6.07 cm, mass = 68.09 ± 6.73 kg) and a control group (n = 20; age = 20.45 ± 1.50 years, height = 172.39 ± 4.39 cm, mass = 67.16 ± 4.87 kg).
Intervention(s)
Participants performed 3 successful SHT trials.
Main Outcome Measure(s)
We calculated SHT time, torque, and torque power in the ankle, knee, and hip joints during the SHT using motion-capture cameras and force plates. Confidence intervals for each group that did not overlap by >3 points consecutively in the time series data indicated a difference between groups.
Results
Compared with the control group, the CAI group showed (1) no delayed SHT time; (2) lower ankle-inversion torque (range = 0.11–0.13 N·m/kg) and higher hip-extension (range = 0.18–0.72 N·m/kg) and -abduction torque (0.26 N·m/kg); (3) less concentric power in ankle dorsiflexion-plantar flexion (0.18 W/kg) and inversion-eversion (0.40 W/kg), more concentric power in hip flexion-extension (0.73 W/kg), and more eccentric power in knee varus-valgus (0.27 W/kg).
Conclusions
Individuals with CAI were likely to rely on hip-joint function to compensate for ankle instability and demonstrated no differences in SHT time compared with the control group. Therefore, the movement strategies of individuals with CAI could differ from those of individuals without CAI, even if SHT time is not different.
Publisher
Journal of Athletic Training/NATA
Subject
Physical Therapy, Sports Therapy and Rehabilitation,Orthopedics and Sports Medicine,General Medicine