Thirty 18-month-old male Sprague–
Dawley rats were randomly divided into four groups: sedentary control (SC); sedentary control with LArg
treatment (SC + Arg); exhaustive exercise (E); and exhaustive exercise with L-Arg treatment
(E + Arg). Rats in groups SC + Arg and E + Arg received a 2% L-Arg diet. Rats in groups E and E + Arg performed
an exhaustive running test on a treadmill