Criterion validity and reliability of a new algorithm to detect jump performance in women's volleyball players.

This article evaluates the criterion validity and reliability of a new algorithm embedded in the WIMU PRO™ inertial measurement unit (IMU) for detecting jump performance in professional women's volleyball players during training. Using data from 1,581 jumps performed by 13 top-level Spanish First Division players and comparing IMU recordings with high-definition video analysis, the study found that the WIMU PRO™ identified 99.24% of jumps with no false positives, demonstrating excellent accuracy and intra-observer reliability (ICC = 0.99). The few missed jumps involved atypical movements with a strong horizontal component rather than standard vertical jumps. These findings support the WIMU PRO™ as a valid wearable tool for monitoring jump load in volleyball training, potentially aiding coaches in optimizing performance and injury prevention.