Reliability of Isokinetic Hip Flexor and Extensor Strength Measurements in Healthy Subjects and Athletes: A Systematic Review and Meta-Analysis.

Guido Contreras-Díaz,Ignacio Chirosa-Ríos,Daniel Jerez-Mayorga,Luis Javier Chirosa-Ríos,Leonardo Intelangelo,Darío Martinez-Garcia

doi:10.3390/ijerph182111326

Abstract

Background: The objective of this systematic review and meta-analysis was to examine the reliability of isokinetic measurements of hip strength in flexion and extension in healthy subjects and athletes. Methods: The databases used were Web of Science, SCOPUS, Medline and PubMed. R was used for all statistical analyses. Results: Hip flexion shows moderate reliability in the supine position (ICC = 0.72; 95% CI: 0.46–0.99) and good reliability in the standing position (ICC = 0.79; 95% CI: 0.54–1.04). Hip extension shows excellent reliability in the supine position (ICC = 0.90; 95% CI: 0.85–0.96) and moderate reliability in the standing position (ICC = 0.72; 95% CI: 0.48–0.96). Flexion of 120°/s and 180°/s showed excellent reliability (ICC = 0.93; 95% CI: 0.85–1.00), (ICC = 0.96; 95% CI: 0.92–1.01). The 60°/s and 120°/s extension showed good reliability (ICC = 0.90; 95% CI: 0.82–0.98), (ICC = 0.87; 95% CI: 0.75–0.99). The 180°/s extension presented excellent reliability (ICC = 0.93; 95% CI: 0.82–1.03). Conclusions: The standing position shows good reliability for hip flexion and the supine position shows excellent reliability for hip extension, both movements have excellent reliability at velocities between 120°/s to 180°/s.

Highlights

Optimal muscle strength levels are directly related to sports performance and rehabilitation [1]
We suggest that ICC values below 0.5 indicate low reliability, values between 0.5 and 0.75 indicate moderate reliability, values between 0.75 and 0.9 indicate good reliability and values above 0.90 indicate excellent reliability [38]
Hip flexion shows good reliability in the standing position (ICC = 0.79; 95% CI: 0.54–1.04)

Summary

Introduction

Optimal muscle strength levels are directly related to sports performance and rehabilitation [1]. In terms of sports performance, it has been shown that runners with greater hip extensor strength have greater anterior trunk inclination when running, which improves running mechanics, reduces the work done by the knee extensors and decreases the probability of knee injury [2]. Likewise, these muscles have a great participation during propulsion in jumping, contributing 31.2% of the work in vertical jumping and 44.2% of the work in horizontal jumping [3].

Results

Discussion

Conclusion