การศึกษาเปรียบเทียบความแข็งแรงของกล้ามเนื้อเหยียดเข่าหลังการออกกำลังกายแบบไอโซคิเนติกด้วยโต๊ะ NK ดัดแปลงและ CON-TREX ไดนาโมมิเตอร์
การศึกษาเปรียบเทียบความแข็งแรงของกล้ามเนื้อเหยียดเข่าหลังการออกกำลังกายแบบไอโซคิเนติกด้วยโต๊ะ NK ดัดแปลงและ CON-TREX ไดนาโมมิเตอร์
Keywords:
muscle strength, quadriceps, isokinetic exerciseAbstract
Objectives: To compare quadriceps strength after isokinetic exercise using a modifi ed NK table and Con-Trex dynamometer.
Study design: Matched pairs randomized controlled trial.
Setting: Southern Medical Rehabilitation Center, Songklanagarind Hospital.
Methods: Healthy volunteers aged between 18-40 years were selected and matched in pairs as far as possible based on their similar quadriceps muscle strength, sex, age and BMI. Each member of each pair was randomly allocated to an exercise and a non-exercise group. Subjects in the exercise group exercised their right leg using the modifi ed NK table and their left leg using the Con-Trex dynamometer 3 times per week for a total of 6 weeks. Subjects in the non-exercise group were instructed not to exercise for 6 weeks. Quadriceps muscle strength in both legs was measured in triplicate using the Con-Trex dynamometer at baseline and at the end of 6 weeks.
Results: In the exercise group, quadriceps muscle strength (mean peak torque) increased signifi cantly from 83.10 Nm to 94.45 Nm in the right leg (modifi ed NK table) (p=0.004) and from 79.15 Nm to 90.66 Nm in the left leg (Con-Trex dynamometer) (p=0.003). In the non-exercise group, quadriceps muscle strength showed a non-signifi cant slightly decrease in both legs. The change in muscle strength in both legs in the exercise group was signifi cantly different from that in the non-exercise group (p=0.026 and 0.003, respectively). The increase in quadriceps muscle strength in the exercise group did not differ signifi cantly between the right (11.35 Nm, 95%CI 3.7, 19.0) and the left legs (11.51 Nm, 95%CI 3.8, 19.2) (p=0.98).
Conclusion: Isokinetic exercise using the modified NK table at velocity of 30 degree per second can increase quadriceps muscle strength with a magnitude equivalent to the increase using the Con-Trex dynamometer as standard exercise equipment.
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