Characteristics of leg extensor muscle in a world champion masters jumper. A case study.
To examine the characteristics of a world champion masters jumper (aged 71 yr), a study was undertaken which included a muscle biopsy and measurement of mechanical force production. Comparisons were made to biopsy data obtained from the literature and to force data on 7 active males (63-81 yrs). Cross-sectional areas of vastus lateralis muscle of the jumper's dominant thigh were 3.43 (type I), 3.32 (type IIA) and 2.34 (type IIB) microns 2 X 10(3). This is smaller than what is reported from sedentary young and old. The torque-time curve of maximal isometric knee extension indicates that the jumper had the highest value per body weight from the onset to the peak (3.48 Nm/kg; 58.2% higher than age-matched controls). These results suggest that the daily training of the jumper has a specific effect on the rate of force production despite his relatively small muscle fiber areas.
Iwaoka
K
K
Funato
K
K
Takatoh
S
S
Mutoh
Y
Y
Miyashita
M
M
D000368:Aged; D001707:Biopsy, Needle; D006801:Humans; D007866:Leg; D008297:Male; D009132:Muscles / Q000033:anatomy & histology / Q000502:physiology*; D010806:Physical Education and Training; D013177:Sports