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Prediction of 1 Repetition Maximum in High-School Power Lifters

KRAVITZ, LEN1; AKALAN, CENGIZ1; NOWICKI, KENNETH2; KINZEY, STEPHEN J.3

The Journal of Strength & Conditioning Research: February 2003 - Volume 17 - Issue 1 - p 167–172
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Eighteen elite male power lifters performed 1-repetition maximum (1RM) and submaximal strength tests (70, 80, and 90% 1RM) to develop prediction equations for the squat (SQ), bench press (BP), and deadlift (DL) exercises. For each equation, stepwise multiple-regression prediction procedure included the maximum number of repetitions (REPS) completed at a given %1RM weight (REPWT). For SQ and BP the 70% 1RM yielded the best 1RM prediction equations: (1RM SQ [kg]) = 159.9 + (0.103 X REPS X REPWT) + (-11.552 X REPS), with a standard error of the estimate (SEE) of 5.06 kg; (1RM BP [kg]) = 90.66 + (0.085 X REPS X REPWT) + (-5.306 X REPS), with an SEE of 2.69 kg. For DL the 80% 1RM yielded the best prediction equation: (1RM DL [kg]) = 156.08 + (0.098 X REPS X REPWT) + (-12.106 X REPS), with an SEE of 4.97 kg. The athlete's years lifted (number of years of power lifting experience) was highly correlated with the 1RM strength for BP and DL (r > 0.70) but not for SQ (r < 0.70). No bodily structural dimension variable had a significant correlation with 1RM strength (r < 0.70). The results of this study indicate that 1RM SQ, BP, and DL may be predicted with an acceptable degree of accuracy in elite male high-school power lifter subjects.

1Exercise Physiology Laboratories, University of New Mexico, Johnson Center #1160, Albuquerque, New Mexico 87111

3Department of Natural Sciences, Itawamba Community College, Fulton, Mississipi 38843; Department of Kinesiology, California State University-San Bernardino, San Bernardino, California 92407.

© 2003 National Strength and Conditioning Association