Thermographic analysis after protocols of induced muscle damage of high and low intensity in brachial biceps of physically active individuals.
Thermography, Eccentric exercise, Muscle strength dynamometer, Creatine kinase, Muscle pain
Introduction: Exercise-induced muscle damage usually occurs with the usual practice of physical exercise, and its magnitude is directly related to the type, intensity, mode or duration of the exercise. The evaluation of DMIE by indirect methods has been increasingly used and more recently, the thermography has been used as a further instrument to measure muscle damage, however the physiological behavior of the superficial temperature in the face of the DMIE is not known. Objective: To evaluate the physiological behavior of body surface temperature after protocols of induced muscle damage of high and low intensity in the biceps brachii. Methods: This is a prospective observational study, composed of healthy men who do not perform any strength and / or endurance training, which will be randomly distributed in low intensity group (gBI) and high intensity group (gAI). The subjects will be evaluated as body temperature (thermography), biochemical indicators (blood concentration of CK, LDH and Mb), clinical (subjective perception of pain, range of motion, subjective perception of effort) and neuromuscular variables by means of isokinetic variables and isometric (peak torque, total work and power). The evaluations will occur 48 hours pre-protocol, immediately before and after, in addition to 24, 48 and 72 hours after the DMIE protocol. The temperature assessment will also be performed 30 minutes after the DMIE protocol, and the effort perception rate will be evaluated only during the protocol. The gBI group will perform an eccentric elbow flexor exercise with 30 repetitions and a selected load of 20% of its maximum voluntary isometric contraction (MVIC) and gAI will perform the same exercise, but with 100% load of its MVIC. Expected results: With this study, it is expected to analyze the physiological behavior of skin surface temperature after muscle damage protocols of different magnitudes and thus to identify the real role of thermography as an instrument to evaluate muscle damage. In addition, identify the relationships of this method with the others used to determine the extent of muscle damage.