Mero, Jaakkola and Komi (1991) Relationship between muscle fibre characteristics and physical performance capacity in trained athletic boys

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Relationship between muscle fibre characteristics and physical performance capacity in trained athletic boys

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CONTRIBUTORS:

	Author:	Mero, A.
	Author:	Jaakkola, L.
	Author:	Komi, P. V.

JOURNAL:

Journal of Sports Sciences (JSS), 9(2), ?? - ??.

YEAR:

1991

PUB TYPE:

Journal Article

SUBJECT(S):

BOY; CHILD; ADOLESCENT; MUSCLE; FIBRE; ACHIEVEMENT; SKILL; CORRELATION; COMPARATIVE-STUDY; SPRINTING; WEIGHTLIFTING; TENNIS; DISTANCE-RUNNING

DISCIPLINE:

No discipline assigned

HTTP:

LANGUAGE:

English

PUB ID:

103-366-312 (Last edited on 2002/02/27 18:45:01 US/Mountain)

SPONSOR(S):

ABSTRACT:
The relatinships between muscle fibre characteristics and the physical performance capacity of trained athletic boys (aged 1-13 years) were studied over 2 days. The subjects were divided into two groups according to muscle fibre distribution. The 'fast' group (FG) comprised 10 subjects (sprinters, weightlifters, tennis players) with more than 50 percent fast-twitch fibres (type II), and the 'slow' group (SG) comprised 8 subjects (endurance runners, tennis players, one weightlifter) with more than 50 percent slow-twitch fibres type I) in their vastus lateralis muscle. The 'fast' group had 59.2 plus/minus 6.3 percent and the 'slow' slow group had 39.4 plus/minus 9.8 percent type II fibres. Other clear differences between the groups were observed as regards reaction time, rate of force development and rise of the body's centre of gravity in the squatting jump. For these variables, the 'fast' group was superior to the 'slow' group. Muscle fibre distribution (percent type II) correlated negatively with reaction time. Muscle fibre area (percent type II) correlated negatively with reaction time and positively with chronological age, height, mass, serum testosterone, force production and blood lactate in the 60-s maximal anaerobic test. There were no significant correlations between muscle fibre characteristics and maximal oxygen uptake. The present study assumes that heredity partly affects the selection of sporting event. Growth, development and training are associated with muscle fibre area, which affects the physical performance capacity of the neuromuscular system in trained young boys.

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