Resistance jump training may reverse the weakened biomechanical behavior of tendons of diabetic Wistar rats

• Published in: Fisioterapia e pesquisa 2017-12, Vol.24 (4), p.399-405
• Main Authors: Silva, Raissa Thais Belarmino, Castro, Patrícia Verçoza de, Coutinho, Marcos Paulo Galdino, Brito, Ana Camila Nobre de Lacerda, Bezerra, Márcio Almeida, Moraes, Silvia Regina Arruda de
• Format: Article
• Language: English
• Subjects: Animal Model; Connective Tissue; Diabetes Mellitus; ORTHOPEDICS; REHABILITATION; Resistance Training
• ISSN: 1809-2950; 2316-9117; 2316-9117
• DOI: 10.1590/1809-2950/17198024042017

ABSTRACT Background: resistance training is widely applied in non-diabetic physical protocol showing effectiveness in improving the tendon tissue. To address this gap, we assessed the effects of resistance training on aquatic environment, on the biomechanical properties of the calcaneal tendon of diabetic Wistar rats. Methods: 59 male Wistar rats were evaluated for 60 days, they were randomly divided into the following groups: Sedentary Control Group (SCG, n=15), Sedentary Diabetic Group (SDG, n=15), Trained Control Group (TCG, n=14) and Trained Diabetic Group (TDG, n=15). After randomization the animals from the SDG and the TDG were induced to Diabetes Mellitus by intraperitoneal injection of Streptozotocin (60 mg/kg). The animals on the trained groups performed resistance exercise that consisted of jumping in an aquatic environment. After nine weeks the calcaneal tendons were collected and tractioned on a conventional mechanical testing machine. Results: the analysis of biomechanical parameters showed lower values in elastic modulus (p=0.000), maximum strength tension (p=0.000) and energy/area (p=0.008) in TDG compared to SDG in addition to an increase on the cross-sectional area (p=0.002). There was no difference for the specific deformation variable. Conclusion: the training protocol used restored some biomechanical parameters of the calcaneal tendon in rats induced to diabetes, thus, resulting in an improvement of its mechanical efficiency. RESUMEN Antecedentes: el entrenamiento de resistencia se aplica ampliamente en el protocolo físico no diabético mostrándose la efectividad en la mejora del tejido del tendón. Para abordar esta brecha, evaluamos los efectos del entrenamiento de resistencia en el ambiente acuático, en las propiedades biomecánicas del tendón calcáneo de las ratas Wistar diabéticas. Métodos: se evaluaron 59 ratas Wistar machos durante 60 días, éstes se dividieron aleatoriamente en los siguientes grupos: Grupo de Control Sedentario (GCS, n=15), Grupo Diabético Sedentario (GDS, n=15), Grupo de Control Entrenado (GCE, n=14) y Grupo Diabético Entrenado (GDE, n=15). Después de la aleatorización, los animales del GDS y del GDE se indujeron a diabetes mellitus por inyección intraperitoneal de Streptozotocin (60mg/kg). Los animales de los grupos entrenados realizaron ejercicios de resistencia que consistían en saltar en un ambiente acuático. Después de nueve semanas, se recogieron y traccionaron los tendones calcaneales en una máquina convenci