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Menopause is the end of woman’s reproductive life and consequences as loss of bone mass and osteoporosis may emerge. The ageing’s sarcopenia entails the reduction of muscle mass and strength, deficit of physical performance and increases the risk of falls and fractures, which is also present in postmenopausal women. Magnetic resonance imaging (MRI) is a noninvasive and effective tool for quantitative assessment and metabolic dynamics of skeletal muscle. Through the T2 map is possible to capture acute muscle disorders caused by physical activity. Intensification of T2 sign is caused by osmotic movement of intramuscular water, increase of acidosis and intracellular space volume. The aim of this study was to evaluate bone mineral density in muscle metabolism in postmenopausal women. We evaluated 8 female patients in postmenopausal for more than 12 months, with a mean age of 63 years, divided into osteoporosis-group (GO=9) and control group (CG=7). They were submitted to MRI examination of thigh at rest (RM1), and then the isokinetic dynamometer at the speed of 180 degrees/second, 2 sets of 10 maximal voluntary contractions and specific exercises to activate the quadriceps muscle (squats and step) and then the RM2 to capture the muscle metabolic changes. For perception of fatigue level, samples of lactate were taken at rest (Lac1), after 1 minute (lac2) and 3 minutes (Lac3) from the end of the exercises. In both groups, it was observed variation of lac2 Lac3, confirming that fatigue levels and changes in RM2 compared to RM1 in the uptake of water were achieved due to intramuscular specific physical changes in post-exercise muscle metabolism. The results showed increased T2 map, characterized by the highest relaxation time in both groups and there are no difference between them. There was no significant correlation of the results of the RNM2 with the parameters of force (peak torque corrected by body mass) and potency (total work) and with the dosage of vitamin D. There was also no correlation between the isokinetic dinamometria and dosage of vitamin D. Osteoporosis does not affect the muscle response of the quadriceps to exercise, assessed by the T2 map of magnetic resonance imaging. The methodology proved to be robust and efficient, showing that MRI is a sensitive method to measure metabolic changes in muscle after exercise.

Resposta pós-exercício vista na ressonância nuclear magnética do músculo quadriceps em mulheres pós-menopáusicas com ou sem osteoporose