Feasibility of the 2-Point Method for Determining the 1-Repetition Maximum in the Bench Press Exercise

Int J Sports Physiol Perform. 2018 Apr 1;13(4):474-481. doi: 10.1123/ijspp.2017-0374. Epub 2018 May 22.

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.

Methods: Thirty men (BP 1RM relative to body mass: 1.08 [0.18] kg·kg-1) 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-1) and a low velocity (≈0.5 m·s-1) 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.

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 (r2 = .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).

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.

Keywords: load–velocity relationship; maximum strength; reliability; validity; velocity-based training.

MeSH terms

  • Biomechanical Phenomena
  • Data Interpretation, Statistical
  • Feasibility Studies
  • Humans
  • Male
  • Muscle Strength / physiology*
  • Reproducibility of Results
  • Resistance Training / methods*
  • Weight Lifting / physiology*
  • Young Adult