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The muscle elasticity chracterized by shear wave modulus (μ) is a mechanic parameter that is related to tissue stiffnes and is not yet described for deltoid muscle. Few studies describe the variation the μ of a muscle during fatigue. The purpose of this study is: to determine μ of deltoid muscle in the shoulder while performing different positions and to analyse the μ during the isometric fatigue process. Elastographic images were acquired in the medial portion of the deltoid muscle of 18 individuals, in neutral position, with 30 ° of abduction and during shoulder support in 80 ° abduction until the fatigue reported by the individual. Considering the mean μ, there was a significant increase in the neutral position for different joint positions (neutral position μ = 9.04 ± 4.04 kpa, 30 ° abduction μ = 41.04 ± 18.53 kpa, 80 ° abduction μ = 44.63 ± 15.44 kpa). During the shoulder support process, μ variation occurred with significant reduction in 40% of the total time. After suporting process ceased, the fatigue process did not affect stiffness. This study may support future clinical studies or physical conditioning of this musculature.

DELTOID MUSCLE SHEAR MODULUS DURING SUSTAINED SHOULDER ABDUCTION BY ELASTOGRAPHY SUPERSONIC SHEAR WAVE