Abstract

BAENA MORALES, S. et al. Reliability of force, power and velocity in a test-Retest of a bench press. CPD [online]. 2016, vol.16, n.3, pp.81-88. ISSN 1989-5879.

The purpose of this study was to analyze the reliability of inter-session measurements of load (kg), peak force (N), mean force (N), mean power (W), peak power (W), average velocity (m * s-1) and peak velocity (m * s-1) obtained at three different levels of intensity (initial load, maximum power and maximum repetition) through an incremental protocol on bench press in a Smith machine. Sixteen healthy subjects (12 males and 4 females) participated in this study voluntarily. Subjects performed an incremental test to reach 1RM on two separate occasions, with at least a 48-hour recovery. A linear position transducer was used to record mean and peak force, power and velocity. All variables were recorded using a customized software of the linear position transducer. The test-retest reliability was measured by the intraclass correlation index (ICC2,1), the standard error of measurement (SEM) and minimum detectable change with 95% probability (MCD95%) for the initial load (CI), maximum power (MP) and repetition maximum (RM). The reliability analysis showed high values in 1RM (ICC2,1 = 0.96, SEM = 3.2 kg and MD= 9,9 kg). Peak power and mean and peak velocity had high ICC values (0,91-0,98) in IL and moderate-high values (ICC2,1= 0,52-0,89) in the MP and 1RM loads. The incremental protocol performed has good reliability in 1RM as well as the rest of the varibles calculated.

Keywords : Upper body; reliability; 1RM strength training.

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