prt | R Documentation |
Data from a Progressive Resistance Randomized Trial.
The prt
data frame has 2471 rows and 9 columns. It contains
data for n = 63 subjects. Each subject underwent muscle biopsy before and
after intervention. Data are stored in a long format with each record
corresponding to one muscle fiber. There are two types of muscle fibers: Type
1 and Type 2. Dependent variables: specific force and isometric force are
measured pre- and post intervention.
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.
Data frame prt
was obtained by merging
prt.subjects
and prt.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.
prt.fiber
, prt.subjects
summary(prt)
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