Prediction of one repetition maximum from the maximum number of repetitions with submaximal loads in recreationally strength-trained men

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Abstract

Objective: The objective of the present study was to determine and validate five equations used to estimate the corresponding load to one repetition maximum (1RM) from the maximum number of repetitions (MNR) using submaximal loads in bench press, leg extension, lat machine pulldowns, leg curl and arm curl exercises in recreational strength-trained men. Methods: The first test conducted was the 1RM test. Following this, the subjects performed the MNR test using loads at 70, 80 and 90% of 1RM for all exercises on different days. To determine each equation, a multiple linear regression model was used in 20 subjects. Two criteria were considered to accept the equation: the adjusted R2 value (adjR2>0.80) and the percent error (PE<10%). For the cross-validation process, the 1RM value measured and estimated were compared in 10 subjects via Pearson product-moment correlation coefficients and paired t-tests. Results: For all exercises, the equations achieved the established criteria, except leg extension (adjR2=0.76). During the process of cross-validation, the values predicted by the equations did not differ from the measured values (P>0.05) and showed a high correlation (0.869-0.995). Conclusions: It can be concluded that determined equation for bench press, lat machine pulldowns, leg curl and arm curl can be used to predict the 1RM load while the equation determined for leg extension cannot be used. © 2012 Elsevier Masson SAS.

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Julio, U. F., Panissa, V. L. G., & Franchini, E. (2012). Prediction of one repetition maximum from the maximum number of repetitions with submaximal loads in recreationally strength-trained men. Science and Sports, 27(6). https://doi.org/10.1016/j.scispo.2012.07.003

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