Which of the following statements BEST describes the traits of type 1 muscle fibers, their role(s)
and how they should be trained?
O Type 1 muscle fibers are fatigue-resistant, containing greater myoglobin and triglyceride (TG)
concentrations and contribute significantly to higher volume or endurance-type work.
O Type 1 muscle fibers are also classified as phasic fibers that serve more stabilizing roles within the body and
generally possess lower mitochondrial densities.
O Type 1 muscle fibers usually contain about 500 muscle fibers per motor unit, exhibit peak contractions of
only about 40-to-50 milliseconds, and respond best to higher loads of training.
O Type 1 muscle fibers are only recruited during low-intensity work given their small diameter, their low stores
of ATP and their rapid nerve conduction speeds.
