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

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.

The Effects of Anchor Schemes on Performance Fatigability, Neuromuscular Responses and the Perceived Sensations That Contributed to Task Termination

“…The results of the present study in women and those of Keller et al [13] in men suggest that there may be muscle-, task-, and/or sex-specific differences for the effects of anchor scheme on TTF during sustained, isometric tasks. The bilateral leg extensions used in Keller et al [13] involved greater engaged muscle mass [51,52] that produced more torque (or force) at RPE = 8 [53,54] than the unilateral forearm flexion tasks in the present study. Perhaps, these differences resulted in musclespecific metabolic responses to fatigue related to muscle oxygenation, ATP utilization, and metabolite buildup [55,56], which influenced the effect of the anchor scheme on TTF.…”