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Feasibility of the 2-Point Method for Determining the 1-Repetition Maximum in the Bench Press Exercise.
- Source :
-
International journal of sports physiology and performance [Int J Sports Physiol Perform] 2018 Apr 01; Vol. 13 (4), pp. 474-481. Date of Electronic Publication: 2018 May 22. - Publication Year :
- 2018
-
Abstract
- Purpose: This study compared the concurrent validity and reliability of previously proposed generalized group equations for estimating the bench press (BP) 1-repetition maximum (1RM) with the individualized load-velocity relationship modeled with a 2-point method.<br />Methods: Thirty men (BP 1RM relative to body mass: 1.08 [0.18] kg·kg <superscript>-1</superscript> ) performed 2 incremental loading tests in the concentric-only BP exercise and another 2 in the eccentric-concentric BP exercise to assess their actual 1RM and load-velocity relationships. A high velocity (≈1 m·s <superscript>-1</superscript> ) and a low velocity (≈0.5 m·s <superscript>-1</superscript> ) were selected from their load-velocity relationships to estimate the 1RM from generalized group equations and through an individual linear model obtained from the 2 velocities.<br />Results: The directly measured 1RM was highly correlated with all predicted 1RMs (r = .847-.977). The generalized group equations systematically underestimated the actual 1RM when predicted from the concentric-only BP (P < .001; effect size = 0.15-0.94) but overestimated it when predicted from the eccentric-concentric BP (P < .001; effect size = 0.36-0.98). Conversely, a low systematic bias (range: -2.3 to 0.5 kg) and random errors (range: 3.0-3.8 kg), no heteroscedasticity of errors (r <superscript>2</superscript> = .053-.082), and trivial effect size (range: -0.17 to 0.04) were observed when the prediction was based on the 2-point method. Although all examined methods reported the 1RM with high reliability (coefficient of variation ≤ 5.1%; intraclass correlation coefficient ≥ .89), the direct method was the most reliable (coefficient of variation < 2.0%; intraclass correlation coefficient ≥ .98).<br />Conclusions: The quick, fatigue-free, and practical 2-point method was able to predict the BP 1RM with high reliability and practically perfect validity, and therefore, the authors recommend its use over generalized group equations.
Details
- Language :
- English
- ISSN :
- 1555-0273
- Volume :
- 13
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- International journal of sports physiology and performance
- Publication Type :
- Academic Journal
- Accession number :
- 28872384
- Full Text :
- https://doi.org/10.1123/ijspp.2017-0374