| Abstract:Objective:Investigated the elite male weightlifting athletes muscle strength characteristics of lumbar spinal cord and knee joint, under the different test speed, measured the lumbar spinal cord and knee joint muscle strength, then found discipline about weightlifting athletes muscle strength, and conducted correlation analysis with the achievements of the athletes. Provided quantitative indicators for athletes back and knee joint exercise capacity and function, found that problems of the test parts flexor and extensor group in the strength training, came up with affecting catch, muscle group parts and characteristics for the jerk performance. To prevent weightlifter joint damage, provide reference for more specific strength training. Methods:Using IsoMed2000isokinetic dynamometer (Germany) measured the lumbar spinal cord and knee joint muscle strength for the12weightlifting athletes, these test parts performed five maximum contractions for flexors and extensors at the angular velocities of60°/s,120°/s,respectively, but measured lumbar spinal cord(180°/s) and knee joint(240°/s)25repeated maximum isokinetic contractions, conducted five times at the angular velocities of180°/s for the knee joint as the former. The results were analysed using SPSS17.0software, the Pearson correlation coefficient was used to analysis the isokinetic test results and the athletes snatch and jerk achievements. Results:(1)12subjects of relative peak torque (PT/W) value, lower back,60°/S (2.19±0.41), and extend (5.71±0.91),120°/S flexion (2.26±0.36), and extension(5.09±0.81),180°/S flexion (1.75±0.26), extension (5.04±0.87mm; Knee joint,60°/S on the left side of the flexor1.79±0.17, and extension3.33±0.57, on the right side, flexion (1.69±0.23), and extension (3.26±0.83),120°/S on the left side of the flexor1.73±0.18, and extension (3.00±0.37), on the right side flexion1.65±0.18, and extension (3.08±0.50),180°/S on the left side of the flexor1.69±0.11, and extension2.93±0.34, on the right side flexorl.54±0.19, and extension2.89±0.35,240°/S on the left side of the flexor1.70±0.14, and extension3.01±0.33, the right side of the flexor1.60±0.16, and2.87±0.22.(2)12subjects back F/E value:60°/S0.39±0.07,120°/S0.45±0.05,180°/S,0.35+/-0.04Knee H/Q:60°/S, left0.54±0.07, right0.54±0.09.120°/S,0.58±0.06mm left, right,0.54±0.07.180°/S,0.58±0.10mm left, right,0.54±0.06.240°/S, left0.57±0.06, right,0.56±0.05mm.(3)12subjects knee joint opposite side muscle strength with the same ratio:60°/S, flexion1.07±0.10, and extension1.05±0.17.120°/S, flexion.06±0.09, and extension0.99±-0.14.180°/S, flexion1.11±0.11, and extensionl.03±0.19.240°/S, flexion1.07±0.10, and extension1.05±0.15.(4)12subjects snatch weight/body weight (120°/S), medium speed and back bend, stretch, and (180°/S) fast flexion PT/W are low positive correlation but not significant (120°/S, flexion, r=0.305, p=0.462and r=0.304, p=0.464.180°/S, flexor r=0.487, p=0.291), with the back quickly and PT/W were moderately significant positive correlation (r=0.573, p=0.037). And knee joint (120°/S), medium speed are moderately significant positive correlated to the PT/W (r=0.564, p=0.564). And knee joint (180°/s) low fast and PT/W are low positive correlation but not significant (r=0.452, p=0.261). And knee joint (240°/S) fast flexion PT/W are low positive correlation but not significant flexor (r=0.385, p=0.346), fast and PT/W were moderately significant positive correlation (r=0.573, p=0.037); jerk/weight and lower back (60°/S) slow down PT/W are low positive correlation but not significant (r=0.461, p=p=0.250). Medium-speed stretch, fast flexion and back are low positive correlation but not significant (120°/S, flexor r=0.400, p=0.326, r=0.343, p=0.406.180°/S, flexor r=0.411, p=0.312), with lower back quickly and moderate significant positive correlated to the PT/W (r=0.631, p=0.030). And knee joint (60°/S and the180°/S) are negatively correlated, low speed slow but not significant (60°/S bending r=0.413, p=0.310,180°/S bending r=0.431, p=0.286), moderately significant positive correlated to the slow stretch (r=0.660, p=0.040). Conclusions:(1) the elite male weightlifting athletes lower back and knee explosive force are better. With the increase of test speed, flexor and extensor mode of the PT/W value appear decline trend. Muscle group after knee flexion(Hamstrings) showed that left is more stronger than the right.(2) the elite male weightlifting athletes lumbar spinal cord range of F/E is from0.27to0.50, the knee joint H/Q value range is from0.41to0.73.(3)Most of the subjects knee side muscle with the same difference is within20%. But in a quick test with3players need to strengthen exercise for the weak side muscle group, prevent excessive use of strong side in training, reduce the risk of injury.4) Snatch weight/body weight with lumbar spinal cord quickly extensor and knee medium-speed bends, knee joint sinking are in moderate significantly positively related to the PT/W value; jerk/weight lumbar spinal cord quickly extensor PT/W value were moderately significant positive correlation, and the knee slow and PT/W value were moderately significant positive correlation (r=0.660, p=0.040). Suggestions to strengthen training of the athletes lumbar spinal cord extension explosive force, the knee joint extension absolute strength and explosive force. |
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