Prediction of one repetition maximum using reference minimum velocity threshold values in young and middle-aged resistance trained males

John Fernandes, Amelia Dingley, Amador Garcia-Ramos, Alejandro Pérez-Castilla, James J. Tufano, Craig Twist

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Abstract

Background; This study determined the accuracy of different velocity-based methods when pre-dicting one-repetition maximum (1RM) in young and middle-aged resistance trained males. Methods: Two days after maximal strength testing, 20 young (age 21.0±1.6 years) and 20 mid-dle-aged (age 42.6±6.7 years) resistance trained males completed three repetitions of bench press, back squat and bent-over-row at loads corresponding to 20-80% 1RM. Using reference minimum velocity threshold (MVT) values, the 1RM was estimated from the load-velocity relationships through multiple (20, 30, 40, 50, 60, 70 and 80% 1RM), two-point (20 and 80% 1RM), high-load (60 and 80% 1RM) and low-load (20 and 40% 1RM) methods for each group. Results: Despite most prediction methods demonstrating acceptable correlations (r= 0.55 to 0.96), the absolute errors for young and middle-aged groups were generally moderate to high for bench press (absolute errors= 8.2 to 14.2% and 8.6 to 20.4%, respectively) and bent-over-row (absolute error= 14.9 to 19.9% and 8.6 to 18.2%, respectively). For squat, the absolute errors were lower in the young group (5.7 to 13.4%) than middle-aged group (13.2 to 17.0%) but still unacceptable. Conclusion: These findings suggest that reference MVTs cannot accurately predict the 1RM in these populations. Therefore, practi-tioners need to directly assess 1RM
Original languageEnglish
JournalBehavioral Sciences
Publication statusAccepted/In press - 29 Apr 2021

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