Manufacturing of Portable and Digital Dynamometer and Its Reliability

Objective: To explore the reliability of a novel dynamometer.Methods: Muscle contraction strength was obtained by a force sensor and conversed to objective datum by A/D conversion.Ten muscle groups of each side of 36 health adults were measured by operator A twice,and 4 adults by operator A and B respectively once at an interval of 7 to 10 days.Results: Intraclass correlation coefficients indicated good intra-rater reliability(0.63-0.99) and inter-operator reliability(0.42-1.0),(P)0.001.Conclusion: The muscle strength measurement system is reliable.The dynamometer can be used as an objective instrument to detect muscle strength,frame rehabilitation treatment plans,and evaluate efficiency of rehabilitation therapy.