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Assessment of the rate of force development scaling factor for the hip muscles
Nicola C Casartelli1, Romuald Lepers, Nicola A Maffiuletti
1Neuromuscular Research Laboratory, Schulthess Clinic, Lengghalde 2, 8008, Zurich, Switzerland; INSERM U1093-Cognition, Action and Sensory Plasticity, University of Burgundy, Dijon, France.
Introduction:
The aim of this study was to evaluate test feasibility, validity, and reproducibility of the rate of force development scaling factor (RFD-SF) for the hip muscles.
Methods:
Feasibility was assessed as the testing compliance, validity as the ability to compute the RFD-SF from a linear regression, and reproducibility with a test-retest design in 20 healthy subjects. Reliability and agreement (reproducibility) were evaluated using intraclass correlation coefficient (ICC3,1) and percent standard error of measurement (SEM), respectively.
Results:
The RFD-SF testing protocol was completed successfully by all subjects, although the analysis had to be modified for hip rotators. Reliability was high (ICC3,1 > 0.70) for all muscles except hip abductors (ICC3,1 = 0.69) and internal rotators (ICC3,1 = 0.58). Agreement was high for all muscles (SEM < 10%).
Conclusions:
Hip adductor, flexor, and external rotator RFD-SF can be evaluated with confidence, provided the analysis is modified for external rotators, whereas hip abductor and internal rotator RFD-SF assessment is not recommended.
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