Muscle fiber type, Achilles tendon length, potentiation, and running economy.
J Strength Cond Res
; 29(5): 1302-9, 2015 May.
Article
em En
| MEDLINE
| ID: mdl-25719915
ABSTRACT
The purpose of this investigation was to develop a potential model for how muscle fiber type, Achilles tendon length, stretch-shortening cycle potentiation (SSCP), and leg strength interact with running economy. Twenty trained male distance runners 24-40 years of age served as subjects. Running economy (net oxygen uptake) was measured while running on a treadmill. Leg press SSCP(force) and SSCP(velocity) were determined by measuring the difference in velocity between a static leg press throw and a countermovement leg press throw. Vertical jump SSCP was determined by measuring the difference in jump height between a static jump and a drop jump from a 20.3-cm bench. Tendon length was measured by magnetic resonance imaging, and muscle fiber type was made from a vastus lateralis muscle biopsy. Type IIx muscle fiber percent (r = 0.70, p < 0.001) and leg strength (r = 0.95, p < 0.001) were positively and independently related to late eccentric force development. Achilles tendon length (r = 0.42, p ≤ 0.05) and late eccentric force during stretch-shortening cycle (r = 0.76, p < 0.001) were independently related to SSCP(force). SSCP(force) was related to SSCP(velocity), which in turn was related to running economy (r = 0.61, p < 0.01). These results suggest that longer Achilles tendon length, type II fiber, and muscular leg strength may enhance the potential for SSCP, running economy, and physiological effort while running.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Corrida
/
Tendão do Calcâneo
/
Fibras Musculares Esqueléticas
/
Músculo Quadríceps
Tipo de estudo:
Health_economic_evaluation
Limite:
Adult
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Humans
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Male
Idioma:
En
Revista:
J Strength Cond Res
Assunto da revista:
FISIOLOGIA
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Canadá