Validity and test-retest reliability of a resistance training device for Smith machine back squat exercise

Hao-Ran Qu; De-Xing Qian; Shou-Sheng Xu; Yan-Fei Shen

doi:10.1016/j.isci.2023.108582

Validity and test-retest reliability of a resistance training device for Smith machine back squat exercise

iScience. 2023 Nov 25;27(1):108582. doi: 10.1016/j.isci.2023.108582. eCollection 2024 Jan 19.

Authors

Hao-Ran Qu¹, De-Xing Qian², Shou-Sheng Xu², Yan-Fei Shen²

Affiliations

¹ Beijing Sport University, School of Sport Science, Beijing 100084, China.
² Beijing Sport University, School of Sport Engineering, Beijing 100084, China.

Abstract

This study evaluated the validity and test-retest reliability of a resistance training device Jueying (Beijing, China) for Smith machine back squat exercise. Twelve male participants completed two test sessions with an interval of one week. In each test session, participants completed 30%, 45%, 60%, and 75% of 1RM back squats on a Smith machine equipped with Jueying and a linear position transducer GymAware (Canberra, Australia), which measured the velocity and power during the movement simultaneously. Results showed that Jueying was both valid (Pearson correlation coefficient [r] = 0.896-0.999, effect size [ES] = 0.004-0.192) when compared with GymAware and consistent between two tests in terms of reliability (intraclass correlation coefficient [ICC] = 0.79-0.95) to assess speed and power within all exercises. The device could be applied to provide athletes and coaches with effective and reliable data in actual application.

Keywords: Physics of human body functions; Rehabilitation physics; Sports medicine.