Analysis of 1 RM differences on paralell and full squat movements on the smith machine
Abstract
One repetition maximum (1RM) testing has been used as an indirect form of evaluating muscle strength and quantifying training intensity, however, one must know the fator that may influence the results. The purpose of the study wasto compare 1RM values for parallel squat (PS) and complete squat (CS) on a Smith machine. 16 healthy and physically active male subjects (age 25,2 ± 5,8 years, body mass 83,7 ± 8,4 kg). The 1RM tests were performed for each exercise on two separate ocasions randomly and 48-hour appart. Tests consisted of a warm up of 10 repetitions without additional weight to the machine, followed by 3 to 5 attempts with a 3-minute rest interval to find 1RM. Data analysis was made with Shapiro-Wilk normality test and Sudent’s t test for paired samples. Significance level was set at p‹0,05. Results are expressed as means ± SD. 1RM values for PS and CS were 103,8 ± 25,4 kg e 73,3 ± 19,8 kg, respectivelly (p‹0,01), with a percent reduction of 28,7 ± 10,1%. These results allowus to conclude that there is a significant difference between PS and CS, therefore 1RM test must be performed on the specif range of motion applied during training.
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