Effect of fatigue strength exercise on anterior thigh skin temperature rewarming after cold stress test

Although dynamic thermography skin temperature assessment has been used in medical field, scientific evidence in sports is scarce. The aim of the study was to assess changes in anterior thigh skin temperature in response to a cold stress test after a strength exercise fatiguing protocol. Ten physically active adults performed a familiarization session and two strength exercise sessions, one with dominant and the other with non-dominant lower limb. Participants performed bouts of 10 concentric and eccentric contractions of leg extensions in an isokinetic device until reaching around 30% of force loss. Infrared thermographic images were taken at baseline conditions and after the fatigue level from both thighs after being cooled using a cryotherapy system. ROIs included vastus medialis, rectus femoris, adductor and vastus lateralis. Skin temperature rewarming was assessed during 180s after the cooling process obtaining the coefficients of the following equation: Delta Skin temperature = beta(0) + beta(1) * ln (T), being beta(0) and beta(1) the constant and slope coefficients, respectively, T the time elapsed following the cold stress in seconds, and Delta Skin temperature the difference between the skin temperature at T respect and the pre-cooling moment. Lower beta(0) and higher beta(1) were found for vastus lateralis and rectus femoris in the intervention lower limb compared with baseline conditions (p < 0.05 and ES > 0.6). Adductor only showed differences in 130 (p = 0.01 and ES = 0.92). The regressions models obtained showed that beta(0) and beta(1) had a direct relationship with age and muscle mass, but an inverse relationship with the number of series performed until 30% of fatigue (R-2 = 0.8). In conclusion, fatigue strength exercise results in a lower skin temperature and a faster thermal increase after a cold stress test.

Automated summary

This study examines changes in anterior thigh skin temperature in response to a cold stress test after a strength exercise fatiguing protocol. The results indicate that fatigue from strength exercise results in lower skin temperature and faster thermal increase after a cold stress test.