Aims: Type 2 diabetes is the result of complex interactions between genetic and environmental factors that affect fat and glucose metabolism. The purpose of this study was to determine the effect of periodic exercise and resveratrol supplement on the expression levels of Pparg Coactivator 1-Alpha (PGC-1α) and Pyruvate Dehydrogenase Kinase (PDK4) genes in gastrocnemius muscle of old rates with type 2 diabetes.
Methods & Materials: 42 male rats (mean age= 40-50 weeks; mean body weight= 250-300 g) were randomly divided into 6 groups: healthy-control, diabetic-control, Diabetic+Periodic Exercise, Diabetic+Supplement, Diabetic+Periodic Exercise+Supplement and Saline. The type 2 diabetes was induced by intraperitoneal injection of Streptozotocin (50 mg/kg body weight). The exercise protocol consisted of 10 sets of 1-min activities at 50% intensity and a 2-min rest period between sets, and each week the speed was increased by 2 meters per minute. The exercises were performed for eight weeks. Resveratrol supplement was injected intraperitoneally daily at a dose of 20 mg/kg body weight. The expressions of PDK4 and PGC-1α in the gastrocnemius muscle were measured by real time Polymerase Chain Reaction (PCR) method. 
Findings: highest expression level of PDK4 and PGC-1α genes in gastrocnemius muscle was observed in the diabetic group received both periodic exercise and Resveratrol supplement and the lowest level was reported in the diabetic-control and saline groups.
Conclusion The combination of resveratrol supplementation and periodic exercise can have beneficial effects on PDK4 and PGC-1α expression levels in the gastrocnemius muscle of old rats with type 2 diabetes and reduce the risks of diabetes-related complications.

Aims: Myostatin and Myocyte Enhancer Factor 2C (MEF2C) are involved in muscle changes associated with bone problems. The aim of the present study was to determine the effect of three therapeutic methods of exercise, ozone, and stem cells on MEF-2C gene expression and myostatin levels of femoral muscle tissue in osteoarthritis rats.
Methods & Materials: This experimental study was done on 63 male rats (mean age of 8-12 weeks and weight of 250-300 g). They were randomly divided into nine groups: the healthy control and osteoarthritis group and seven intervention groups of osteoarthritis rats, including , saline, exercise, ozone therapy, MSCs, MSCs+ozone therapy, exercise+ozone therapy, and exercise+MSCs. Osteoarthritis was induced in rats by surgery. The training program consisted of 30 min of running on a non-slip treadmill at a speed of 16 m/min. Rats in the MSCs group received 1×106 cells/kg. The ozone was injected into the articular line of the knee tibiofemoral at a concentration of 20 μg/mL. Tissue levels of myostatin were measured by enzyme-linked immunosorbent assay kits and MEF2C gene expression was measured by real-time polymerase chain reaction method. 
Findings: Cell+exercise, exercise+ozone, and cell+ozone groups showed a significant increase in MEF2C gene expression and a significant decrease in myostatin levels compared with the cell, exercise, and ozone groups (P<0.05). In the exercise+cell group, these changes were greater.
Conclusion: The results showed that the combination of exercise and MSCs with an increase in MEF2C gene expression and a decrease in myostatin levels, can possibly have beneficial effects on the stimulatory and inhibitory factors of interactions between muscle and bone in the osteoarthritis rats, and ultimately reduce the risks of muscle weakness due to osteoarthritis complications.