Affiliations: [a] Faculty of Sport, University of Ljubljana, Ljubljana, Slovenia | [b] General Hospital Murska Sobota, Murska Sobota, Slovenia | [c] Faculty of Computer and Information Science, University of Ljubljana, Ljubljana, Slovenia
Correspondence:
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Corresponding author: Darjan Spudić, Institute of Sport, Faculty of Sport, University of Ljubljana, Gortanova 22, 1000 Ljubljana, Slovenia. Tel.: +386 40 866 892; E-mail: [email protected].
Abstract: BACKGROUND: Flywheel (FW) load represents a new trend among resistance exercise (RE) modalities; however, protocols and acquisition systems to measure FW-RE parameters are not yet fully researched and developed. OBJECTIVE: To assess the reproducibility and criterion validity of a prototype FW-RE acquisition system. METHODS: Thirty-eight student volunteers completed the low-row FW testings with a test-retest break of 1 week. Force (F), power (P) and velocity (v) parameters were simultaneously collected using a prototype FW acquisition system and a load cell (LC), respectively. Paired samples t-test was used to determine differences between test-retest and inter-devices results. The analysis included Pearson’s correlation (r), standard error of measurement (SEM), smallest real difference (SRD) and Bland-Altman plots. In addition, for reproducibility purposes, ICC and smallest real difference (SRD) were calculated. RESULTS: An excellent correlation was found between FW and LC parameters (r= 0.971–0.997). The FW acquisition system provided us with significantly higher values among F and P parameters for men and women. The testing protocol that was used has shown good-to-excellent reproducibility for FW acquisition system in men (ICC = 0.771–0.985) and women (ICC = 0.773–948), respectively. Both men and women performed better during the retest. SEM and SRD values were higher for women (4.4–22.7%) compared to men (4.9–10.5%). CONCLUSIONS: The FW device and acquisition system described in this study has shown adequate criterion validity and good-to-excellent reproducibility of mechanical RE parameters for sports-diagnostic purposes. However, a familiarization session is necessary to obtain true measurements of a performance when using the FW based assessement in women.
