Validation of equation based on repetitions to failure to adjust the training load in women undergoing resistance training

Abstract The objective of this study was to analyze the validation of the equation based on repetitions to failure for training load adjustment in middle-aged women undergoing resistance training (RT). Ten women (35.5 ± 5.0 years, 67.8 ± 11.6 kg, 165.9 ± 4.5 cm, 24.5 ± 3.8 m/kg2) with previous experience in RT of at least one year were selected to participate in this research. The participants performed two resistance exercise sessions, separated by intervals of at least 48 h. In the first session, the participants completed the maximum repetition test to determine the load for the following session. The equation based on repetitions to failure aimed to adjust the load for 8-12 RM load was applied. The second session was conducted with the load adjusted according to the equation, in which the participants performed three sets to failure. The eight exercises tested showed averages within the 8-12 RM repetition zone. Leg press 45o = 11.3 (8.8-13.6), seated row = 11.3 (8.9-13.7), knee extension = 9.3 (8.5-10.0), bench press = 9, 2 (8.2-10.1), leg curl = 7.5 (6.5-8.4), lat pulldown = 8.6 (7.4-9.8), standing calf raise = 13.6 (11.3 -15.9), and triceps pushdown = 11.6 (9.8-13.3). Results suggest that the equation based on repetitions to failure is a valid strategy for adjusting the training load intensity in resistance exercises in women with previous experience in RT.