Deformação relativa e frouxidão do tendão calcanear durante mobilização articular passiva através de ultra-sonografia por imagem

Abstract

Background: In vivo study of the mechanical behavior of tendons may bring advances in evaluating the impact of intervention programs for fl exibility and strength, in clinical practice and sports. Objective: The aim of this study was to quantify the relative strain and slackness of achilles tendons during passive mobilization, for four ankle joint angles and two knee angles. Methods: The displacement of the muscle-tendon junction was quantifi ed by means of ultrasound images acquired during passive ankle mobilization, with the aid of an electrogoniometer and an electromyograph to ensure the achievement of the required angles and muscle inactivity, respectively. Results: The strain values ranged from 4.28%±2.37 to-0.94%±1.58 for the fully extended knee, and from 2.38%±1.63 to-2.32%±2.16% for the fl exed knee. Conclusions: The values found in this study confi rm those in the literature and demonstrate how the Achilles tendon participates in length changes in the muscle-tendon unit during passive movement. These results suggest that the mechanical properties of tendinous tissues affect the relationship between the length of muscle fi bers and the joint angle, even during this type of movement.

Effect of a 10-Week Stretching Program of the Triceps Surae Muscle Architecture and Tendon Mechanical Properties

“…Initially, with the volunteer in prone position and the feet off the padded bed, muscle-tendon junction (MTJ) was localized along medial gastrocnemius longitudinal axis [29] with the US transducer oriented longitudinally (Hitachi Medical Corporation, Tokio, Japan with central frequency of 7.5 MHz) in the dominant leg. The distance between the MTJ and the distal tendon insertion was considered the AT length ( L T ).…”