Research Group in Sports Biomechanics (GIBD), Department of physical education and Sports, Universitat de València, Valencia, Spain.
Research Group in Sports Biomechanics (GIBD), Department of physical education and Sports, Universitat de València, Valencia, Spain; Research Group in Medical Physics (GIFIME), Department of Physiology, Universitat de València, Valencia, Spain.
J Therm Biol. 2021 Oct;101:103098. doi: 10.1016/j.jtherbio.2021.103098. Epub 2021 Sep 16.
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: ΔSkin temperature = β + β ln(T), being β and β the constant and slope coefficients, respectively, T the time elapsed following the cold stress in seconds, and ΔSkin temperature the difference between the skin temperature at T respect and the pre-cooling moment. Lower β and higher β 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 β (p = 0.01 and ES = 0.92). The regressions models obtained showed that β and β had a direct relationship with age and muscle mass, but an inverse relationship with the number of series performed until 30% of fatigue (R = 0.8). In conclusion, fatigue strength exercise results in a lower skin temperature and a faster thermal increase after a cold stress test.
尽管动态热成像皮肤温度评估已在医学领域得到应用，但在运动科学领域的证据却很少。本研究旨在评估在进行力量疲劳协议后，冷应激测试对大腿前侧皮肤温度的影响。10 名活跃的成年人进行了一次熟悉度测试和两次力量训练，其中一次使用优势下肢，另一次使用非优势下肢。参与者在等速设备上进行了 10 次股四头肌伸展的向心和离心收缩，直到达到约 30%的力量损失。在使用冷冻疗法系统冷却后，在基线条件和疲劳水平下从双腿拍摄红外热图像。ROI 包括股直肌、股外侧肌、内收肌和股外侧肌。在冷却过程后 180 秒评估皮肤温度复温，获得以下方程的系数：ΔSkin temperature = β + β ln(T)，其中 β 和 β 分别为常数和斜率系数，T 为冷应激后经过的时间（秒），ΔSkin temperature 为 T 时刻的皮肤温度与预冷却时刻的皮肤温度之差。与基线条件相比，干预侧下肢的股外侧肌和股直肌的 β 和 β 值较低（p < 0.05，ES > 0.6）。只有内收肌的 β 有差异（p = 0.01，ES = 0.92）。获得的回归模型表明，β 和 β 与年龄和肌肉质量呈直接关系，但与完成疲劳前 30%的系列次数呈反比（R = 0.8）。总之，疲劳力量训练会导致冷应激测试后皮肤温度降低和更快的热增加。
