Muscle strength isokinetic testing of the shoulder, hip and knee joint: Comparison between teenagers with sprint training and those without training

Zhang Yan, Li Li, Zhai Feng-ming, Chen Yu-juan

Department of Physical Education, Shijiazhuang College, Shijiazhuang  050035, Hebei Province, China

Zhang Yan★, Master, Lecturer, Department of Physical Education, Shijiazhuang College, Shijiazhuang  050035, Hebei Province, China lili781217@tom.com

Supported by: the Eleventh Five-Year Scientific Research Plan of Higher Education Academy of China, No. 06AIJ0240006*

Abstract
BACKGROUND: In isokinetic testing researches, the effect of sport training on the development of teenager muscle groups is less reported.
OBJECTIVE: To assess the muscle strength of shoulder, hip and knee joints in different teenager populations with isokinetic testing system.
DESIGN, TIME AND SETTING: The contrast observation was performed at the laboratory of Institute of Physical Education, Hebei Normal University between October and December 2006.
PARTICIPANTS: Control group included 30 volunteers without sport training randomly selected from four middle schools in Shijiazhuang, 15 male and 15 female; training group included 30 volunteers with sprint training randomly selected from Shijiazhuang Sports School, 15 male and 15 female.
METHODS: We used Kinitech isokinetic testing system (Kylingk, Austrilia) to test the shoulder, hip and knee joint of the 60 participants according to 3 different angular velocities: 60( °)/s, 120 (°)/s and 240( °)/s.
MAIN OUTCOME MEASURES: Peak torque (PT) values of extensor and flexor groups in shoulder, hip and knee joints.
RESULTS: The 60 volunteers were all included in the result analysis. PT values of shoulder joints were bigger in the male training group than in the control group at 60( °)/s, 120 ( °)/s and 240 ( °)/s (P < 0.01), while the differences between the female training group and the control group were not statistically significant (P > 0.05); PT values of hip joints were bigger in the male training group than in the control group at 60( °)/s, 120( °)/s and 240( °)/s (P < 0.05, P < 0.01), while the differences between the female training group and the control group were not statistically significant (P > 0.05); PT values of knee joints were bigger in the male and female training group than in the control group at 60 ( °)/s, 120 ( °)/s and 240 ( °)/s (P < 0.05, P < 0.01).
CONCLUSION: Sprint exercise has a distinctively positive effect in boys on the increase of the muscle strength of shoulder, hip and knee joints and the coordinated development of extensor and flexor groups, whereas, its effect on the shoulder and hip joints of girls is not significant.

Zhang Y, Li L, Zhai FM, Chen YJ. Muscle strength isokinetic testing of the shoulder, hip and knee joint: Comparison between teenagers with sprint training and those without training.Zhongguo Zuzhi Gongcheng Yanjiu yu Linchuang Kangfu 2008;12 (28): 5432-5435(China) [www.zglckf.com/zglckf/ejournal/upfiles/08-28/28k-5432(ps).pdf]