Background. Muscles not only shorten during contraction to perform mechanical work, but they also bulge radially because of the isovolumetric constraint on muscle fibres. Muscle bulging may have important implications for muscle performance, however quantifying three-dimensional (3D) muscle shape changes in human muscle is problematic because of difficulties with sustaining contractions for the...

The purposes of this study were to create a three-dimensional representation of strain during isometric contraction in vivo and to interpret it with respect to the muscle fiber direction. Diffusion tensor MRI was used to measure the muscle fiber direction of the tibialis anterior (TA) muscle of seven healthy volunteers. Spatial-tagging MRI was used to measure linear strains in six directions du...

Abstract Extended-field-of-view ultrasonography is a valid alternative to determine the dimensions of skeletal striated muscle; however, some factors may influence final measurement. The aim this study was test-retest reliability and measurement error vastus lateralis muscle architecture variables through internal anatomical landmarks compare three fixed determined points using extended-field-o...

Background Rheumatoid arthritis (RA) patients usually present extra-articular manifestations [1], which affect muscle strength, mass and physical functional [2]. There are several methods to assess and, among these methods, ultrasound (MU) has been suggested as an alternative morphology [3]. Objectives [1] To the MU of quadriceps verify changes over time (1-year) in thickness pennation angle RA...

PURPOSE The purpose of this study was to assess muscle architecture changes in subjects who were administered supraphysiologic doses of testosterone enanthate (TE) and concurrently performed heavy resistance training. METHODS Ten subjects were randomly selected from the 21 subjects who participated in a previously published study (12). Subjects were allocated to one of two groups as per Giorg...

Muscle architecture has been proposed as one of the most important determinants muscle strength and power performance. The purpose present investigation was to correlate with power, agility maximal in Italian division I Field Hockey (FH) players. Twenty players (age = 25.4 ± 5.2 y; body mass 78.5 9.0 kg; height 179.6 7.8 cm) were assessed for composition, agility, sprint isometric force squat (...

BLAZEVICH, A. J., and A. GIORGI. Effect of testosterone administration and weight training on muscle architecture. Med. Sci. Sports Exerc., Vol. 33, No. 10, 2001, pp. 1688-1693. Purpose: The purpose of this study was to assess muscle architecture changes in subjects who were administered supraphysiologic doses of testosterone enanthate (TE) and concurrently performed heavy resistance training. ...

Purpose to establish reference values for ultrasound shear-wave elastography for pericranial muscles in healthy individuals (m. trapezius, m. splenius capitis, m. semispinalis capitis, m. sternocleidomastoideus and m. masseter). Also to evaluate day-to-day variations in the shear-wave speeds and evaluate the effect of the pennation of the muscle fibers, ie scanning parallel or perpendicularly t...

In this paper, we investigate the design of pennate topology fluidic artificial muscle bundles under spatial constraints. Soft actuators are great interest to roboticists and engineers, due their potential for inherent compliance safe human–robot interaction. McKibben muscles an especially attractive type soft actuator, high force-to-weight ratio, flexibility, inexpensive construction, muscle-l...