ABSTRACT
@#ObjectiveTo evaluate the reliability of the Cybex 6000 isokinetic dynamometer in measuring the shoulder extensor contracted concentrically and eccentrically.Methods15 male subjects with no previous shoulder injuries were studied. The extensor muscles groups of asymmetrical shoulder were tested at 60°/s, 120°/s, and 180°/s respectively. Variables studied included peak torque (PT), average power (AP) and total work (TW). The interclass correlation coefficient (ICC) was used to determine the reliability.ResultsHigh test-retest reliability, ICC ranging from 0.86 to 0.97, was demonstrated for all tests.ConclusionThe Cybex 6000 isokinetic dynamometer shows a good reliability in measuring the shoulder extensor isokinetic contracted concentrically and eccentrically.
ABSTRACT
Objective To investigate the changes of collagen and proteoglycan of Guinea pig’s Achilles tendon suffering from different loads of training. Methods Achilles’ tendons of Guinea pigs were harvested after training, stained by picrosirius and toluidine blue respectively. Collagen Ⅰ, Ⅲ and proteoglycan were observed by polarization microscopy and atomic force microscopy (AFM) and analyzed semiquantitatively. Results After enforced training, the relative content of collagen Ⅲ was(16.71?1.37)% in Group A and (13.43?3.16)% in Group B, that were significantly increased compared with (9.57?1.90)% in control group (P
ABSTRACT
Objective To study the adaptability of rat' skeletal muscle to medium load on endurance training. Methods 40 male Wistar rats were used in an upward-slope running with medium load. Then the ultrastructural changes of the soleus muscle and IGF-1 expression in different training stages were observed. Results The pathologic change of muscular tissues suggested that there was kinesic injury in rat soleus muscle, and the injury happened most seriously in the third week, when muscle structure experienced a relative 'fragile' period. At the same time, there was an obvious increase of IGF-1 in muscular tissues, which indicated that the muscle started to repair of itself immediately after injury. The abnormity rate of Z-cure and IGF-1 level began to decline gradually after 4 weeks, meanwhile the pathologic change reduced. Conclusion After been injured, the pathologic changes of muscle underwent a course of going serious then reducing accompanied with the reparation. The fact indicated that rat skeletal muscle showed a good adaptability to the injury accumulation.
ABSTRACT
Objective To compare the effectiveness of running training, swimming training and intensified cyclic training by means of morphometry and to determine the most effective training mode to develop the aerobic ability of the skeletal muscle. study the adaptability of rat skeletal muscle to different endurance training modes. Methods Twenty-five healthy male Wistar rats of 8 weeks old were divided into five groups, 10 of them having no exercise be divided into control group 1 and control group 2, others took part in running exercise, swimming exercise and intensified cyclic exercise respectively. The rats in control group1 were killed at the beginning of the exercise. The free activity group was taken as the control group 2, the rats were not given any interventions, they could move freely in the cage and be killed at the end of the exercise (n=5). The rats in running group were forced to take part in an upward-slope (+5?) running task of medium load, the rats should kept running at the speed of 16m per minute for 45 minutes. The rats in swimming group were forced to keep swimming in the pool for 45 minutes, The rats in intensified cyclic group were kept running for 30 minutes (the running mode was same to the running group), then had a rest for 15 minutes, and at last the rats were forced to keep swimming in the pool for 30 minutes. The rats in training groups were trained for 6 days every week with 1-day rest for 8 continuous weeks. We observed the change of aerobic ability of the soles muscle in different training modes. Results The three kinds of endurance training developed the aerobic metabolism ability of skeletal muscle in rats effectively. The intensified cyclic training can do better than swimming training and running training in promoting remodeling reconstruction of skeletal muscle, and developing the muscle, function. Conclusion The intensified cyclic training can shorten the period of remodeling reconstruction of skeletal muscle, and more effective in developing the aerobic ability of the skeletal muscle than other endurance training modes.