Relationship between upper and lower limbs muscle explosive strength with the vastus lateralis and biceps brachii architecture

Correlação entre a força muscular explosiva dos membros superiores e inferiores com a arquitetura do vasto lateral e do bíceps braquial

Correlación entre la fuerza muscular explosiva de las extremidades superiores e inferiores con la arquitectura del vasto lateral y el bíceps braquial

ABSTRACT

We aimed to assess upper and lower limbs explosive strength, and its correlation with biceps brachii (BB) and vastus lateralis (VL) architecture. Absolute and maximum torque normalized rate of torque development (RTD) were measured from isometric elbow flexion (EF) and knee extension (KE). BB and VL architectures were assessed by ultrasound. Absolute RTD of KE was higher (129–272%), although normalized RTD was higher in EF (80-21%). The absolute RTD was correlated to muscle thickness only in the BB (r=.39-46). No relationship was found between muscle architecture and normalized RTD. In conclusion, the higher RTD from KE seems to be due to their greater strength. Only the muscle architecture could not explain the differences found in the RTD.

Keywords: Muscle architecture; Rate of torque development; Rate of force development; Explosive force