ArticleFrontiers in sports and active living2025
An investigation of the reliability, validity, and impact of operator expertise on assessing vertical jump height in collegiate badminton athletes with My Jump Lab.
Article in Frontiers in sports and active living, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Purpose: This study aimed to evaluate the influence of operator experience on vertical jump height measurements in university badminton athletes using My Jump Lab, while concurrently assessing the tool's reliability and validity against the gold-standard OptoJump system. Methods: Seventy-six university badminton athletes (32 females, 44 males) participated in the study. Three vertical jump modalities-countermovement jump (CMJ), countermovement jump with arm swing (CMJAM), and squat jump (SJ)-were simultaneously measured using My Jump Lab and OptoJump. My Jump Lab data were processed by two operators with substantially different levels of experience. A mixed-design repeated-measures analysis of variance (ANOVA) was conducted to examine the effect of operator experience on measurement outcomes. Bland-Altman analysis, complemented by linear regression of differences vs. means, was employed to evaluate measurement agreement and detect proportional bias. Results: Intraclass correlation coefficients (ICC₁,₁) for both experienced and inexperienced operators were ≥0.92, with coefficients of variation (CV) < 5%, indicating excellent intra-operator reliability. Inter-operator reliability was exceptionally high, with ICC₂,₁ values of 0.992 (CMJ), 0.992 (CMJAM), and 0.983 (SJ), all accompanied by CV < 5%. Repeated-measures ANOVA confirmed that the main effect of operator experience was statistically non-significant [ Conclusion: Operator experience exerts minimal practical impact on My Jump Lab derived vertical jump height measurements in university badminton athletes. The tool demonstrates robust reliability and validity, making it suitable for routine training monitoring by operators with varying experience levels in grassroots sports settings. While significant proportional bias was identified for CMJAM, this does not compromise My Jump Lab's utility for relative performance monitoring (e.g., longitudinal training progress tracking), and absolute measurement accuracy can be enhanced via calibration if required. Strict standardization of movement protocols and post-test video review remain essential for SJ testing to mitigate inaccuracies associated with unintended countermovement.
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