Muscle Fiber Characteristics, Satellite Cells and Soccer Performance in Young Athletes

作者：Metaxas Thomas I; Mandroukas Athanasios; Vamvakoudis Efstratios; Kotoglou Kostas; Ekblom Bjorn; Mandroukas Konstantinos^*

来源：Journal of Sports Science and Medicine, 2014, 13(3): 493-501.

• MHC isoforms
• satellite cells
• muscle fiber type
• maximal oxygen uptake
• isokinetic muscle strength
• young soccer players

This study is aimed to examine the muscle fiber type, composition and satellite cells in young male soccer players and to correlate them to cardiorespiratory indices and muscle strength. The participants formed three Groups: Group A (n = 13), 11.2 +/- 0.4yrs, Group B (n= 10), 13.1 +/- 0.5yrs and Group C (n = 9), 15.2 +/- 0.6yrs. Muscle biopsies were obtained from the vastus lateralis. Peak torque values of the quadriceps and hamstrings were recorded and VO(2)max was measured on the treadmill. Group C had lower type I percentage distribution compared to A by 21.3% (p < 0.01), while the type IIA relative percentage was higher by 18.1% and 18.4% than in Groups A and B (p < 0.05). Groups B and C had higher cross-sectional area (CSA) values in all fiber types than in Group A (0.05 < p < 0.001). The number of satellite cells did not differ between the groups. Groups B and C had higher peak torque at all angular velocities and absolute VO(2)max in terms of ml.min(-1) than Group A (0.05 < p < 0.001). It is concluded that the increased percentage of type IIA muscle fibers noticed in Group C in comparison to the Groups A and B should be mainly attributed to the different workload exercise and training programs. The alteration of myosin heavy chain (MHC) isoforms composition even in children is an important mechanism for skeletal muscle characteristics. Finally, CSA, isokinetic muscle strength and VO(2)max values seems to be expressed according to age.

• 出版日期2014-9