Wearable Technology

Document Type



The purpose of this study was to assess the accuracy of the motusBASEBALLTM sensor. Trained/developmental male adult baseball pitchers (n = 10) threw ten pitches each from a regulation mound while kinematic and kinetic data were captured using an optical motion capture system and a motusBASEBALLTM sensor. Absolute and relative agreement were assessed. Outputs from the motusBASEBALLTM sensor were significantly different to the motion capture outputs for elbow varus torque, shoulder rotation, and arm speed (p < .05). Data were similar for arm slot (p = .847). Correlations (r) between system outputs were not significant (p > .05) and ranged from 0.312 to 0.630. The motusBASEBALLTM sensor is not a valid sensor for measuring elbow varus torque, shoulder rotation, and arm speed. Researchers and practitioners should use the device with caution.