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A Novel Intrinsic Foot Muscle Strength Dynamometer Demonstrates Moderate-To-Excellent Reliability and Validity
Authors
Dante D Goss
Jennifer Xu
Susan A Saliba
Publication date
1 August 2023
Publisher
North American Sports Medicine Institute
Abstract
# Background Intrinsic foot muscle (IFM) weakness can result in reduced foot function, making it crucial for clinicians to track IFM strength changes accurately. However, assessing IFM strength can be challenging for clinicians, as there is no clinically applicable direct measure of IFM strength that has been shown to be reliable and valid with the foot on the ground. # Purpose The purpose was to investigate the intra-rater and inter-rater reliability of a novel, budget-friendly IFM dynamometer and determine its agreement with a handheld dynamometer (HHD). The researchers also examined correlations of foot morphology and activity level to IFM strength. # Study design Descriptive Laboratory Study # Methods Two assessors measured IFM strength of 34 healthy volunteers (4 male, 30 female; age=21.14±2.57, height=164.66 ±7.62 cm, mass=64.45±11.93 kg) on two occasions 6.62±0.78 days apart with the novel dynamometer to assess intra- and inter-rater reliability. The HHD was used to measure IFM in the first session in order to assess validity. # Results For the novel dynamometer, intra- and inter-rater reliability was moderate-to-excellent (ICC = 0.73 -- 0.95), and the majority of the strength tests were within the 95% limits of agreement with the HHD. Wider foot morphology and a higher number of days walking over the prior seven days had small but significant correlations with IFM strength (dominant foot r = 0.34, non-dominant foot r = 0.39; r = -0.33, -0.39 respectively). # Conclusion This novel IFM dynamometer is a budget-friendly (\$75) tool that was shown to be reliable and valid in a healthy population. # Levels of evidence Level 3 ©The Author(s
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Last time updated on 02/08/2023