چكيده لاتين :
The One Repetition Maximum (1-RM) test is commonly used to
assess strength. However, direct assessments of 1-RM are time
consuming and unsafe for novice lifters. Whilst various equations
exist to predict 1-RM, there is limited research on the
validity of these equations. The purpose of this study was to
assess the validity of using sub-maximal ratings of perceived
exertion (RPE) to predict 1-RM in young adults, using the Borg
6-20 RPE Scale. Twenty healthy participants (ten male (Mean ±
SD, 20.8 ± 0.6 y, 75.7 ± 9.3 kg, 1.8 ± 0.07 m) and ten female
(20.3 ± 0.7 y, 68.4 ± 10.0 kg, 1.68 ± 0.03 m)) completed two
trials involving resistance exercises for both the upper and lower
body. In the first trial the 1-RM for the bilateral biceps curl (BC)
and the bilateral knee extension (KE) were determined for each
participant. In the second trial, participants performed blinded
repetitions which were equivalent to 20, 40 and 60 % of 1-RM
for both exercises. The RPE was recorded immediately after two
repetitions had been completed at each intensity. The order of
intensity of the repetitions was randomly assigned with participants
wearing blindfolds to exclude the possibility of predetermined
judgments about load and RPE. Individual RPE
recorded at each intensity was subjected to linear regression
analysis and the line of best fit was extrapolated to RPE 20 to
predict 1-RM in both exercises. There was no significant difference
(p > 0.05) between the 1-RM predicted from RPE 20 and
measured 1-RM for both exercises for the men and women.
Measured and predicted values for men were 46.0 ± 4.6 and
45.2 ± 6.1 kg for biceps curl, and 46.3 ± 3.8 and 43.0 ± 7.1 kg
for knee extension, respectively. Measured and predicted values
for women were 18.6 ± 5.7 and 19.3 ± 5.6 kg for biceps curl,
and 25.5 ± 9.6 and 27.2 ± 12.6 kg for knee extension, respectively.
Pearson product-moment correlation coefficients between
actual and predicted 1-RM for the BC and KE were 0.97
and 0.92, respectively. These results provide evidence that
submaximal ratings of perceived exertion can be used to provide
reasonably accurate estimates of 1-RM in young and active men
and women.
