Muscle-specific measures taken from medial gastrocnemius (MG), lateral gastroc (LG), plantaris (PL), and soleus (SOL): terminal muscle mass, mean cross-sectional area (CSA), glycogen, capillary contacts, and citrate synthase.
MUSCLESAn object of class data.frame with 1116 rows and 11 columns:
character; randomly generated 8-digit identifier used in linkage to phenotypic data. All samples from the same animal have the same PID.
character; unique ID used for each rat at the Iowa PASS.
factor; the sex of the rat with levels "Female" and "Male".
factor; exercise training group. Either "SED" (sedentary) or the number of weeks of training ("1W", "2W", "4W", "8W").
factor; the age of the rat at the beginning of the training protocol. Levels: "6M" (Adult) and "18M" (Aged).
factor; the muscle that was sampled with levels "LG" (lateral gastrocnemius), "MG" (medial gastrocnemius), "PL" (plantaris), and "SOL" (soleus).
numeric; terminal muscle mass (mg).
numeric; mean fiber cross-sectional area (CSA; \(\mu m^2\)).
numeric; muscle glycogen (\(ng/\mu L \text{ supernatant}/mg \text{ tissue}\)).
numeric; capillary contacts (number of capillaries per fiber).
numeric; citrate synthase (\(U / \mu g \text{ protein} \times 10^3\)).
head(MUSCLES)
#> pid iowa_id sex group age muscle term_muscle_mass mean_CSA glycogen
#> 1 10043527 06F8T1 Female SED 6M LG 556 NA 0.4531043
#> 2 10043527 06F8T1 Female SED 6M MG 390 NA NA
#> 3 10043527 06F8T1 Female SED 6M PL 189 NA NA
#> 4 10043527 06F8T1 Female SED 6M SOL 82 NA 11.9411249
#> 5 10043799 06F8T3 Female SED 6M LG 530 2097 0.3550705
#> 6 10043799 06F8T3 Female SED 6M MG 372 1457 1.7721638
#> capillary_contacts citrate_synthase
#> 1 NA 40.20675
#> 2 NA 46.79487
#> 3 NA 40.10283
#> 4 NA 47.12712
#> 5 3.43 41.60562
#> 6 3.44 52.48407