COMPORTAMENTO DA VARIABILIDADE DA FREQUÊNCIA CARDÍACA E TERMOGRAFIA INFRAVERMELHA NO DANO MUSCULAR INDUZIDO PELO EXERCÍCIO.

Abstract

Objective: The aim of this study is to investigate the relationship between autonomic nerve activation and infrared thermography after an eccentric exercise protocol. Materials and Methods: The sample consisted of ten male volunteers, physically active, aged between 18 and 30 years. Subjects were allocated to a single experimental group. The following collections were performed in the laboratory: heart rate variability (HRV), subjective pain and recovery scales, thermographic evaluation and jumping tests. The exercise protocol to induce muscle damage consisted of plyometric jumps. All of the above procedures were repeated at the 24-hour, 48-hour and 72-hour recovery times. Results: The results for VAS showed a significant increase in the post-protocol moments 24, 48 and 72h (p=0.000; p=0.000 and p=0.002) when compared to baseline, the same was verified for the PSR results, showing a reduction at 72h (p=0.003). For the irradiated skin temperature, there were significant increases in the distribution of pixels for the anterior thigh regions in the cold and neutral zones at 24h and 48h, respectively (p=0.001; p=0.035; p=0.035; p=0.001) and in the posterior region in the cold zones at baseline, 24, 48h (p=0.034; p=0.000; p=0.017) and hot at all times (p=0.006; p=0.003; p=0.003; p=0.045). In the anterior region of the leg, significant differences found in the cold zone at 24h (p=0.000) and neutral at baseline and 24h (p=0,039; p=0,000) and the values in the posterior region differences in the cold zone at baseline and 24h (p=0.027; p=0.002) and neutral at baseline (p=0,038). For HRV values, the LF/HF ratio, there were significant differences at all times of analysis (p=0.000; p=0.011; p=0.002; p=0.013). When analyzed separately in %HF, there was a difference between 24h-48h and 48h- 72h (p=0.016; p=0.015) and %LF showed significant differences at all analyzed moments. Conclusion: By describing the behavior of the skin temperature irradiated by IT, as well as the autonomic participation by HRV in the frequency domain, against the muscle damage-inducing protocol. Based on the findings, we can predict that these methods can be used to assess the effects of eccentric exercise on physiological responses of skin thermal control and sympathetic and parasympathetic autonomic modulation, as a way of monitoring for possible muscle injuries.