The Effects of Passive Warm-Up With Ultrasound in Exercise Performance and Muscle Damage

Background: Warm-up before exercise could increase blood flow of whole body, increase muscles and skin temperature, prevent injury within exercise. Passive warm-up can increase temperature of muscles as active warm-up do, but it won’t cause the muscle fatigue. To use heat packs or to apply ultrasound is the way for passive warm-up. Purpose: To determine the effects of two different modalities of passive warmup and exercise without warm-up on exercise performance and recovery on muscle damage. Methods: Eight volunteers were participated in this study (age =23.88±5.06 y/o), and all of them were involved into three groups as control group (CON), heat packing group (HP) and ultrasound group (USD). CON never received any warm-up protocol before eccentric exercise, HP received 15 minutes of superficial heat with electrical heat pack before exercise, and USD received 7 minutes of deep heat with ultrasound diathermy before exercise. Each subject processed 30 repeated bouts of eccentric exercise with 80% MVC level. Serum CK, MVC, ROM and CIR were measured before, immediately after exercise and at 2nd, 4th, 7th, and 10th days post-exercise. Results: When measuring serum CK and CIR, there were no significant difference between CON, HP and USD (p>0. 05). When measuring ROM and MVC, there were significant difference between CON, HP and USD (p