Review : Effects of caffeine ingestion on muscle power output in trained and untrained adolescents

Journal of Exercise Nutrition & Biochemistry 2002;6(1):1-10.

Abstract

C
affeine is known to stimulate lipolysis during endurance exercise that enhances free fatty acid utilization in skeletal muscle. However, caffeine also stimulates calcium secretion in sarcoplasmic reticulum that increases muscle power out during high intensity ∼ 15 min of exercise. Therefore, this study investigated the effect of caffeine ingestion on muscle power out in trained and untrained adolescents. Subjects were administered caffeine (5㎎/㎏ bw) or water as a placebo 1 h before the Cybex test then rest in sits position. Leg and arm muscle peak torque were measured at 60, 180, and 240 degree. Blood were collected at rest, before the test, and just after the test. The same protocol was performed 1 week after the test to the same subject with different supplement as used before. Arm and leg muscle peak torque was significantly increased both extension and flexion in trained subjects. Blood calcium concentration was significantly increased by caffeine ingestion just after exercise in trained subjects, and was significantly increased 1 h after caffeine ingestion in untrained subjects. These results suggested that caffeine also increased muscle power in specific types of exercise performance as an anaerobic exercise. However, its effects were not shown in untrained adolescents.