| Summary: | 碩士 === 臺北市立大學 === 競技運動訓練研究所 === 102 === Abstract
Purpose: This study investigated the effect of remote ischemic preconditioning (RIPC) on lower limb muscle strength, muscle endurance, explosive force, agility, and reation time.
Method: Six elite, college-aged, male Judo athletes were randomly assigned to two groups by using a crossover, counter-balance design. Each group received either RIPC or sham RIPC tests first then received the other one condition (sham RIPC or RIPC) tests. The subjects received RIPC with pressure 50 mmHg above their systolic blood pressure or sham RIPC with pressure applied at 10 mmHg. In both the RIPC and sham RIPC procedures, blood pressure cuffs were placed on the thighs, and pressure was applied alternately to the left and right thighs in 5-minute intervals in 3 successive rounds. After completing the procedure, all subjects were tested immediately. All tests were completed within 10 minutes of RIPC or sham RIPC to simulate the conditions of a competition wherein the effects of treatment must be immediate. Therefore, after the first session of RIPC or sham RIPC, the explosive force of counter movement jump, agility, and reaction time were tested. After the second session of RIPC or sham RIPC, maximal lower limb muscle strength and endurance were tested. Four testing times were separated into 4 weeks with at least one week interval between times. Results were analyzed by using dependent t-tests to determine the differences between the effects of RIPC and sham RIPC. Results: Subjects who underwent RIPC had a mean agility time of 16.96 ± 0.54 sec; subjects who underwent sham RIPC had a mean agility time of 17.43 ± 0.67 s; a significant difference (p= 0.020) was observed between the RIPC and sham RIPC conditions. In the muscle endurance test, after 30 times of continual knee flexion and extension, the mean maximal muscle strength in subjects who underwent RIPC and sham RIPC respectively reduced to 44.00 ± 10.30% (BW) and 55.67 ± 14.47% (BW) of the initial values; a significant difference (p= 0.0410) was observed between the RIPC and sham RIPC conditions. There was no significant differences between RIPC and sham RIPC regarding the muscle strength, explosive force, or reaction time tests.
Conclusion: RIPC has a significant and immediate positive effect on the lower limb agility of college-age, elite, male Judo athletes. RIPC has an immediate negative influence on lower limb muscle endurance and has no immediate effects on lower limb muscle strength, explosive force, and reaction time in these subjects.
Keywords: Muscle strength, muscle endurance, explosive force, agility, reaction time
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