Reliability and Minimal Detectable Change of Running Parameters Monitored by Fitness Watch and Accelerometer
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Abstract
Background: Fitness watch and accelerometer provides running parameters. However, the levels of the reliability of running parameters are still controversial.
Objective: To examine the test-retest reliability and the minimal detectable change of run parameters.
Methods: Twenty healthy volunteers wore the fitness watch and accelerometer attached at the edge of volunteers’ pants. They ran on the treadmill continuously for five minutes at their comfortable speed and repeated the running protocol for two consecutive days (a total of three days) at the same speed.
Results: The intra-class correlation coefficient (ICC 3,k) for test-retest reliability of cadence, ground contact time, vertical oscillation, and stride length illustrated 0.98, 0.97, 0.95, and 0.94 respectively which indicated an excellent level of reliability. For all parameters, standard error of measurements (SEMs) were less than the minimal detectable changes (MDC) at the 95% confidence interval.
Conclusion: Fitness watch together with accelerometer could provide excellent reliability of running parameters in respect of cadence, ground contact time, vertical oscillation, and stride length.
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