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Copyright of Ordnance Industry Automation is the property of Editorial Board for Ordnance Industry Automation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to understand the effect of low - frequency vibration stimulation on the behavior and physiology of Larimichthys crocea,this study simulated the vibration of breeding cabin by self-made steel sink and actuator,and used the main frequency of underwater noise of traditional knocking operation to catch large yellow croaker. The frequency of 125 Hz (150 dB) and 200 Hz (150 dB) were used to conduct vibration stimulation experiments on 250 g and 500 g groups of large yellow croaker to determine the behavioral response and physiological and biochemical changes of large yellow croaker ( cortisol, epinephrine, thyroxine). The results showed that:(1) In the early stage of acoustic stimulation,the behavioral responses of the two groups of test fish were characterized by random movement,cruising away after slow approach,free or around cruising. After adaptation,the test fish were basically in a regular or free cruising around the wall,cruising away after slow approach,or stagnant,and there was no obvious disturbance response. (2) In 250 g test group,the change of adrenaline at 125 Hz frequency (about 40. 93% increase) was the most significant (P<0. 05). Under the condition of 200 Hz frequency,the change of thyroxine (increased by about 41. 08%) was the most significant (P< 0. 05). Except for increase of other blood indexes except epinephrine was higher than that of 125 Hz frequency group. Therefore,250 g large yellow croaker was more sensitive to 200 Hz. In the 500 g test group, the change of thyroxine ( increased by about 28. 68%) at 125 Hz frequency was the most significant ( P < 0. 05),and other blood indexes decreased. Under the condition of 200 Hz frequency,the change of thyroxine (increased by about 41. 79%) was the most significant (P<0. 05) and higher than that of 125 Hz frequency group,while other blood indexes increased in different degrees in 200 Hz frequency group. Therefore,the 250 g and 500 g groups were more sensitive to 200 Hz vibration stimulation. In this study, the effects of low - frequency vibration stimulation on the behavioral response and physiological and biochemical indexes of large yellow croaker were analyzed. The aim was to improve the growth rate,survival rate and quality of large yellow croaker during the breeding process of large yellow croaker,and to provide data support and reference [ABSTRACT FROM AUTHOR]

Copyright of Laser Technology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Water Conservancy Science & Techonlogy & Economy is the property of Water Conservancy Science & Technology & Economy Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: In lower steps, downhill running, and squatting training, the lower limb muscles are in centrifugal contraction, and it is easy to cause soreness of extensor muscles and minor muscle damage. However, there are few reports on the injury caused by the application of elbow flexor with the same centrifugal speed to extensor muscles. OBJECTIVE: To reveal the law of muscle injury by given maximum isokinetic eccentric contraction exercise at fast and slow speeds to the knee extensor. METHODS: The study was approved by the Ethics Committee of Chongqing Vocational College of Applied Technology. Sixteen untrained healthy male college students were selected and signed the informed consents. During the period of 2 weeks, the left and right legs of each participant were given 120 seconds of maximum isokinetic eccentric contraction exercise at slow ((30 (°)/s, 6 groups x 5 times)) and fast (210 (°)/s, 6 groups x 35 times) speeds, respectively. The degree of muscle soreness, thigh circumference, knee joint range of motion, maximum autonomic isometric muscle strength, and blood creatine kinase activity were measured before and after exercise. RESULTS AND CONCLUSION: (1) Muscle soreness peaked at 2-3 days after the end of training at different speeds, which showed that muscle soreness induced by rapid training was more serious than slow training, but both of them could recover to the level before training on day 5 after the end of exercise. (2) Thigh circumference increased at different speeds, but thigh circumference increased significantly faster than slow training and recovered more slowly. (3) The range of motion and maximum isometric muscle strength of knee joint after rapid training were significantly lower than those after slow training. The recovery speed of both was significantly different, which showed that range of motion of knee joint and maximum isometric muscle strength decreased slowly after slow training, and basically returned to the level after training on day 3 after the end of slow training. In fast condition, range of motion of knee joint and maximum isometric muscle strength decreased significantly, peaked later, and recovery was more significant, and took longer time to recover completely on day 5 after the training. (4) The creatine kinase activity induced by fast training was significantly higher than that induced by slow training, and the slow training could recover quickly, but the creatine kinase activity of fast training group was still increasing on day 5 after the end of training, which showed that the muscle damage caused by fast training was much higher than that caused by slow training. (5) These results imply that the difference of muscle soreness, thigh circumference, range of motion of knee joint, maximum isometric muscle strength, blood creatine kinase, maximal muscle strength and recovery time caused by centrifugal contraction may be related to the total amount of centrifugal training. On the premise of controlling the activation time of fast and slow speed muscles, the degree of muscle injury caused by rapid isokinetic centrifugal training is much higher than that caused by slow speed, which supports the conclusion that centrifugal contraction speed is related to muscle injury. It also confirms that rapid centrifugal exercise is more likely to cause muscle injury. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Liaoning Technical University (Natural Science Edition) / Liaoning Gongcheng Jishu Daxue Xuebao (Ziran Kexue Ban) is the property of Journal of Liaoning Technical University (Natural Science) Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Liaoning Technical University (Natural Science Edition) / Liaoning Gongcheng Jishu Daxue Xuebao (Ziran Kexue Ban) is the property of Journal of Liaoning Technical University (Natural Science) Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Beijing University of Technology is the property of Journal of Beijing University of Technology, Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)