Effect of Semi-Rigid and Soft Ankle Braces on Static and Dynamic Postural Stability in Young Male Adults

Noriaki Maeda; Yukio Urabe; Shogo Tsutsumi; Shuhei Numano; Miho Morita; Takuya Takeuchi; Shou Iwata; Toshiki Kobayashi

Effect of Semi-Rigid and Soft Ankle Braces on Static and Dynamic Postural Stability in Young Male Adults

J Sports Sci Med. 2016 May 23;15(2):352-7. eCollection 2016 Jun.

Authors

Noriaki Maeda¹, Yukio Urabe¹, Shogo Tsutsumi¹, Shuhei Numano¹, Miho Morita¹, Takuya Takeuchi¹, Shou Iwata¹, Toshiki Kobayashi²

Affiliations

¹ Graduate School of Biomedical & Health Sciences, Hiroshima University , Hiroshima, Japan.
² Department of Prosthetics and Orthotics, Faculty of Health Sciences, Hokkaido University of Science , Hokkaido, Japan.

PMID: 27274675
PMCID: PMC4879451

Abstract

Ankle braces have been suggested to protect ankle joints from a sprain by restricting inversion and improving proprioception. However, the difference in effects between a semi-rigid brace and a soft brace regarding dynamic postural control after landing is not known. The aim of the present study was to compare the effect of soft (SB) and semi-rigid (SRB) ankle braces on static and dynamic postural stability in healthy young men. Altogether, 21 male adults (mean age 24.0 ± 1.5 years) were assessed for one leg while wearing non-brace (NB), SB or SRB. Balance in single-limb stance on a single-force platform with open eyes and closed eyes were assessed for the non-dominant leg under SB, SRB, and NB conditions. Locus length/second (mm/s) and the enveloped area (mm·s(-2)) surrounded by the circumference of the wave pattern during postural sway were calculated. For assessing dynamic postural stability, the participant jumped and landed on one leg on a force platform, and the Dynamic Postural Stability Index (DPSI) and the maximum vertical ground reaction force (vGRFmax) were measured. The data were compared among the three conditions with repeated-measures analysis of variance. The correlations between locus length/second, enveloped area, DPSI values (DPSI, Anterior-Posterior Stability Index, Medial-Lateral Stability Index, and Vertical Stability Index), and vGRFmax were then calculated. The results indicated that locus length/second and enveloped area with open eyes and closed eyes were not significantly different for each condition. However, a significant lower in the DPSI and Vertical Stability Index were observed with the SRB in comparison to the SB and NB. A significant improvement in vGRFmax was also observed with the SRB in comparison to NB. SRB demonstrated a positive effect on dynamic postural stability after landing on a single leg and may improve balance by increasing dynamic postural stability. Key pointsThis study examined the effect of ankle braces on healthy young individuals during dynamic postural stability using the DPSI.The semi-rigid brace improved dynamic postural stability compared with the soft brace and no brace.

Keywords: Ankle brace; Dynamic Postural Stability Index; dynamic postural balance; static postural balance.