Using Repetitions to Fatigue to Predict One Repetition Maximum Bench Press

The aim of this study was to estimate one maximum repetition through repeating lighter weights up to fatigue in bench press. The sample including 99 male bodybuilders with at least one year of experience in weight training, Participated in this research. The instrument included bench press on bench to collect the data. Any subject chose a weight he could press once. One maximum repetition was measured with adding and removing weights. Then, 5 Kilograms were omitted from the weights when athletes performed bench press after 3 minutes. In every set, 5 kilograms were omitted until the repetition reached 20 maximum repetitions. Based on high correlation coefficient and possibility of drawing estimation equivalence in the research, 4 equivalences were obtained from 5, 6 to 10, 11 to 15, 16 to 20 repetitions, 2 equivalences from 10 sub repetitions and over-repetitions to estimate one maximum repetition, 19 equivalences were suggested to estimate one maximum repetition from every 2 to 20 maximum repetitions. 1 equivalence of estimation of one maximum repetition was obtained from body weight and weight repetition equivalence to body weight. A table was obtained to estimate one maximum repetition from 2-20 maximum repetitions. Low and high correlation coefficients were (r=0.93) to (r= 0.99). One maximum repetition can estimate both fewer than 10 maximum repetitions and 10 to 20maximum repetitions . But the more maximum repetitions is closer to one, the more accurate it is estimated. But for accurate estimation of one maximum repetition, we can use separate equivalences 2 to 20 maximum repetition.