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KMID : 0383119990460010007
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Journal of Aerospace Medicine
1999 Volume.46 No. 1 p.7 ~ p.19
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Isokinetic and Isometric Evaluation of the Knee Muscle in the Pilots
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Park Byung-Hyun
Yim Sung-Vin
Lee Moon-Hoon
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Abstract
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The strength of knee muscles was measured in isokinetically and isometrically in order to obtain the normative data in pilots. The purpose of this study were to measure the isokinetic peak torque and endurance of knee flexors and exteriors at speed of 60° /sec and 180°/sec, and isometric peak torque of extensor at 60° by using the cybex isokinetic dynamometer. Two hundred and ninety-five subjects were tested, 59 non-pilots and 236 pilots, between the aged 34.5±9.19 and 34.5±3.53, respectively. The results obtained were as follows; 1. The mean peak torque of Hamstring at speed of 60°/sec were 73.8±24.99ft lbs in non-pilots(n=20), and 86.64±17.68ft lbs in pilots(n=109). The mean peak torque of
Quadriceps were 122.7±40ft lbs in non-pilots, and 146.55±25.07ft lbs in pilots. 2. The mean peak torque of Hamstring at speed of 180°/sec were 51.85±22.41ft lbs in non-pilots, and 61.44±15.03ft lbs in pilots. The mean peak torque of
Quadriceps were 81.2±28.69ft lbs in non-pilots, and 94±19.01ft lbs in pilots. 3. The endurance ratio of Hamstring at speed of 180° /sec were 85.25±61.24% in non-pilots, and 75.41±42.44% in pilots. The Quadriceps endurance ratio of non-pilots and pilots were 78±48.33% and 66.36±22.17%, respectively. 4. The isometric peak torque of knee extensor at 60° was 137.85±31.81ft lbs in non-pilots, and 176.7±32.05ft lbs in pilots. 5. The mean peak torque of Hamstring at speed of 60°/sec were 78.37 ± 15.80ft lbs in helicopter and cargo(n=45), 83.81±19.65ft lbs in F-4 and F-5(n= 145), and 94.26±
18.35ft lbs in F-16(n=20). The mean peak torque of Quadriceps were 137.64±24.70ft lbs in helicopter and cargo, 142.67±26.41ft lbs in F-4 and F-5, and 155.46±24.31ft lbs in F-16. 6. The mean peak torque of Hamstring at speed of 180°/sec were 53.97±15.17ft lbs in helicopter and cargo, 58.12±17.06ft lbs in F-4 and F-5, and 65.86±20.41ft lbs in
F-16. The mean peak torque of Quadriceps were 86.42±15.18ft lbs in helicopter and cargo, 90.06±18.12ft lbs in F-4 and F-5, and 97.06±22.97ft lbs in F-16. 7. The endurance ratio of Hamstring at speed of 180°/sec were 93.46±58.80% in
helicopter and cargo, 87.70±55.75% in F-4 and F-5, and 75.2±25.38% in F-16. The Quadriceps endurance ratio of helicopter and cargo, F-4 and F-5, and F-10 were 77.31 ±40.97%, 73.22±41.07%, and 63.26± 15.54%, respectively.
8. The peak torque of isometric knee extensor at 60° was 169.4±27.19ft lbs in helicopter and cargo, 173.99±33.48ft lbs in F-4 and F-5, and 172.46±35.85ft lbs in F-16. 9. As flight time increased, there were no significant differences in the mean peak torque and endurance ratio among the groups(group Ⅰ below than 500hrs, group Ⅱ 50 0∼1,000hrs, group Ⅲ 1,000∼1,500hrs, and group Ⅳ above than 1,500hrs). 10. The mean values of sit-up in pilots(n=65) was higher than those of non-pilots(n=59) with significant difference(35.5±3.54 for pilots, 26±11.31 for non-pilots). According to above data, resistance training and isometric muscle training can be advantageous to improve G tolerance.
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