Data from a Progressive Resistance Randomized Trial.
prtA data frame with 2471 rows and 9 columns:
A factor with 63 levels: 5, 10, 15, 20, 25, ..., 520 (subject id)
A factor with 2 levels: High, Low, i.e., training (intervention) intensity
A factor with 2 levels: Young, Old (stratifying variable)
A factor with 2 levels: Female, Male (stratifying variable)
A numeric vector with values of BMI at baseline ranging from 18.36 to 32.29
A numeric vector with values of isometric force ranging from 0.16 to 2.565
A numeric vector with values of specific force ranging from 80.5 to 290
A factor with 2 levels: Pre, Pos, i.e., pre- and post-intervention
A factor with 2 levels: Type 1, Type 2, i.e., Type 1 and Type 2 muscle fiber
Claflin, D.R., Larkin, L.M., Cederna, P.S., Horowitz, J.F., Alexander, N.B., Cole, N.M., Galecki, A.T., Chen, S., Nyquist, L.V., Carlson, B.M., Faulkner, J.A., & Ashton-Miller, J.A. (2011). Effects of high- and low-velocity resistance training on the contractile properties of skeletal muscle fibers from young and older humans. Journal of Applied Physiology, 111, 1021-1030.
Data frame prt was obtained by merging prt.subjects and prt.fiber.
data(prt, package = "nlmeU")
summary(prt)
#> id prt.f age.f sex.f bmi
#> 15 : 48 High:1228 Young:1172 Female:1359 Min. :18.37
#> 50 : 46 Low :1243 Old :1299 Male :1112 1st Qu.:23.00
#> 25 : 44 Median :24.77
#> 95 : 44 Mean :24.94
#> 10 : 43 3rd Qu.:26.96
#> 5 : 41 Max. :32.29
#> (Other):2205
#> iso.fo spec.fo occ.f fiber.f
#> Min. :0.1600 Min. : 80.5 Pre:1228 Type 1:1299
#> 1st Qu.:0.6490 1st Qu.:135.3 Pos:1243 Type 2:1172
#> Median :0.8280 Median :155.2
#> Mean :0.8783 Mean :157.2
#> 3rd Qu.:1.0430 3rd Qu.:176.4
#> Max. :2.5650 Max. :290.0
#>