Validity and Reliability of A New Low-Cost Linear Position Transducer to Measure Mean Propulsive Velocity: the ADR Device
Proceedings of the Institution of Mechanical Engineers Part P, Journal of sports engineering and technology(2022)
摘要
Many sports and recreational strength training coaches consider movement velocity essential to improve performance, and velocity-based training has gained attention over the past decade. Furthermore, there is a lack of low-cost, easy to use, and reliable methods to measure movement velocity. Therefore, this current research aims to analyze the validity and reliability of a new linear position transducer device (ADR) for the measurement of barbell mean propulsive velocity. Seventeen trained participants ( n = 14 men; n = 3 women; 21.2 ± 4.0 years) performed an incremental bench press exercise test against five different loads (45%, 55%, 65%, 75%, and 85% 1RM) at maximal concentric velocity. Barbell displacement was derived simultaneously from three devices including: a linear velocity transducer (T-Force, criterion measurement) and two linear position transducers (ADR and Speed4lifts (S4L)). The ADR mean propulsive velocity measurements demonstrated substantial validity compared to both T-Force and S4L at all loads (between the r values and p values r = .86–.99 p < 0.001). The ADR device was reliable showing very high Intraclass correlation coefficients (ICC (95% CI): 0.95 (0.90–0.98), 0.96 (0.91–0.98), 0.75 (0.55–0.88), 0.91 (0.83–0.93), 0.85 (0.72–0.93) for 45%, 55%, 65%, 75%, and 85% 1RM, respectively); low coefficients of variation (CV (95% CI): 9.93 (7.93–11.93, 11.25 (9.25–13.25), 6.78 (4.78–8.78), 10.95 (8.95–12.95), 14.40 (12.40–16.40) for 45%, 55%, 65%, 75%, and 85% 1RM, respectively), and small standardized typical error values (STE = 0.2–0.6). In conclusion, the ADR device can be considered an affordable, reliable, and valid method to measure movement velocity, thereby making it a practical resource for coaches when assessing velocity-based training at gyms.
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关键词
Resistance training,barbell velocity,linear encoder,velocity based-training,kinematics,lifting,strength training,ADR,1RM
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