Publications by authors named "Carolina Carneiro Peixinho"
This study aimed to determine the effects of a functional training and ankle stretching program in triceps surae torque, passive stiffness index, and in the risk for fall indicators in older adults. Twenty women (73.4 ± 7.
View Article and Find Full Text PDFUltrasound biomicroscopy and claudication test for in vivo follow-up of muscle repair enhancement based on platelet-rich plasma therapy in a rat model of gastrocnemius laceration.
Acta Cir Bras
February 2016
Purpose: To track the regeneration process of lateral gastrocnemius due to a muscle laceration in rats, and to treatment with plateletrich plasma (PRP).
Methods: Ultrasound (40 MHz) images were used for measuring pennation angle (PA), muscle thickness (MT) and mean pixel intensity, along with claudication scores, of treated (PRPG) and non-treated (NTG) groups of rats.
Results: NTG showed a PA increase for the non-injured leg (p<0.
A methodology is proposed for estimating Achilles tendon tangent modulus in vivo, to account for its large deformations and non-linear behavior. True stress is found dividing the axial force by the tendon true cross-sectional area (CSA), whose shrinking caused by axial tension is estimated with Poisson׳s coefficient. The true strain is calculated as the integral of incremental deformations along the tendon length change.
View Article and Find Full Text PDFArticle Synopsis
- This study utilized ultrasound biomicroscopy (UBM) to measure the pennation angle (PA) and muscle thickness (MT) in rat skeletal muscle, focusing on reliability and reproducibility through statistical analysis.
- The research involved ten male Wistar rats, with measurements taken on two separate days and at two ankle positions, showing varying degrees of coefficient of variation (CV) and intraclass correlation coefficients (ICC) for both PA and MT.
- Findings indicated high reliability of UBM in assessing muscle characteristics, with significant differences in PA based on ankle position, highlighting UBM’s potential for future studies on muscle adaptation and rehabilitation.
Structural adaptations of rat lateral gastrocnemius muscle-tendon complex to a chronic stretching program and their quantification based on ultrasound biomicroscopy and optical microscopic images.
Clin Biomech (Bristol)
January 2014
Background: A chronic regimen of flexibility training can increase range of motion, with the increase mechanisms believed to be a change in the muscle material properties or in the neural components associated with this type of training.
Methods: This study followed chronic structural adaptations of lateral gastrocnemius muscle of rats submitted to stretching training (3 times a week during 8weeks), based on muscle architecture measurements including pennation angle, muscle thickness and tendon length obtained from ultrasound biomicroscopic images, in vivo. Fiber length and sarcomere number per 100μm were determined in 3 fibers of each muscle (ex vivo and in vitro, respectively), using conventional optical microscopy.