PURPOSE/ BACKGROUND: Hand-held dynamometers are commonly used to assess plantarflexor strength during rehabilitation. The purpose of this study was to determine the concurrent validity of measuring plantarflexion force using a hand-held dynamometer (HHD) as compared to an electromechanical dynamometer as the gold standard. The hypothesis was that plantarflexor forces obtained using a hand-held dynamometer would not show absolute agreement with a criterion standard. DESIGN: Concurrent validity assessment for a diagnostic strength testing device. SETTING: Institutional clinic and research laboratory. PARTICIPANTS: Volunteer sample of healthy university students (N=20, 10 women, 10 men; 25.9±4.1 years). MAIN OUTCOME MEASURES: Maximal plantarflexion strength was measured using both a HHD and an electromechanical dynamometer (EMD) as a criterion measure. RESULTS: Plantarflexor force measures with the HHD were significantly different (p<0.01) and not correlated with plantarflexor forces measured using the EMD for either limb (R(2) ≤ 0.09). CONCLUSIONS: Plantarflexor strength measurements acquired using HHD are different from those acquired using an EMD and are likely influenced by the strength of the examiner. LEVEL OF EVIDENCE: Prospective cohort study, level II.
PURPOSE/ BACKGROUND: Hand-held dynamometers are commonly used to assess plantarflexor strength during rehabilitation. The purpose of this study was to determine the concurrent validity of measuring plantarflexion force using a hand-held dynamometer (HHD) as compared to an electromechanical dynamometer as the gold standard. The hypothesis was that plantarflexor forces obtained using a hand-held dynamometer would not show absolute agreement with a criterion standard. DESIGN: Concurrent validity assessment for a diagnostic strength testing device. SETTING: Institutional clinic and research laboratory. PARTICIPANTS: Volunteer sample of healthy university students (N=20, 10 women, 10 men; 25.9±4.1 years). MAIN OUTCOME MEASURES: Maximal plantarflexion strength was measured using both a HHD and an electromechanical dynamometer (EMD) as a criterion measure. RESULTS: Plantarflexor force measures with the HHD were significantly different (p<0.01) and not correlated with plantarflexor forces measured using the EMD for either limb (R(2) ≤ 0.09). CONCLUSIONS: Plantarflexor strength measurements acquired using HHD are different from those acquired using an EMD and are likely influenced by the strength of the examiner. LEVEL OF EVIDENCE: Prospective cohort study, level II.
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