The Influence of Daily Exercise on Muscle Echo Intensity and Stiffness in Young Women
This study aimed to investigate the effect of daily exercise on skeletal muscle
function, size, and quality in young women. Twenty-six young women participated
in this study, categorized into daily exercise and non-exercise groups. The
exercise group had performed exercise or training three times a week for more
than six months. Knee extension and flexion, plantar flexion, and dorsiflexion
peak torques were measured for muscle function. B-mode ultrasound images were
taken from the thigh and calf, and muscle thickness and echo intensity were
measured in the vastus lateralis and medial gastrocnemius. Shear modulus at
different joint angles of the knee (0° [full extended], 40°, and
90°) and ankle (40 °plantarflexion, 0° [neutral], and
10° dorsiflexion) was measured from the vastus lateralis and medial
gastrocnemius to determine muscle stiffness. Peak torque and echo intensity did
not significantly differ between the exercise and non-exercise groups. Shear
modulus in the medial gastrocnemius at 10° dorsiflexion was
significantly lower in the exercise group compared with the non-exercise group
(34.2±7.7 vs. 46.5±13.1 kPa, P<0.05). These
results suggest that daily exercise and training could affect muscle stiffness,
but do not lead to an increase in muscle function. [...] Georg Thieme Verlag Rüdigerstr...
Source: International Journal of Sports Medicine - Category: Sports Medicine Authors: Yoshiko, Akito Mitsuyama, Hirohito Kuramochi, Rieko Ohta, Megumi Tags: Training & Testing Source Type: research
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