Introduction Humans have two distinct types of muscle, type I and type II. Type I is considered slow, oxidative, and is used more commonly for endurance activities. Type II is considered fast, glycolytic and even oxidative, but it is used more for sprint-related activities. In addition, phosphorylase, lactic dehydrogenase (LDH), and succinate dehydrogenase (SDH) are skeletal muscle enzymes along with myosin ATP, NADII2, tetrazolium reducatse, and alpha-gycerophosphate dehydrogenase help determine the muscle types based on these measurements.
Purpose of the Study
The purpose of the study is to measure the amount of these skeletal muscle enzymes and muscle fiber composition of track and field athletes compared to untrained subjects.
Methods The experiment consists of testing maximum VO2 uptake for the subjects to measure their caliber of training, whether the subjects had no training for a few years or those who have been participating in intense exercise. Also, each subject had a muscle sample of his or her gastrocnemius (lateral head) taken by a needle biopsy technique.
a) Subjects: The experiment consisted of 34 men and 27 women and were measured in which 23 of the men and 17 of the women were highly trained, internationally competitive track athletes. Within the track and field athlete category, this consisted of sprint runners, middle-distance runners, distance runners, long-high jumpers, javelin throwers, and shot-put/discus throwers. These track athletes