Wearing graduated compression stockings augments cutaneous vasodilation in heat-stressed resting humans
Autor: | Naoto Fujii, Toshiya Nikawa, Takeshi Nishiyasu, Glen P. Kenny, Narihiko Kondo, Bun Tsuji |
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Rok vydání: | 2017 |
Předmět: |
Adult
Male Mean arterial pressure Baroreceptor Physiology 030204 cardiovascular system & hematology Thigh Heat Stress Disorders 03 medical and health sciences 0302 clinical medicine Forearm Physiology (medical) Humans Medicine Orthopedics and Sports Medicine Skin business.industry Public Health Environmental and Occupational Health 030229 sport sciences General Medicine Thermoregulation Compression (physics) Graduated compression stockings Vasodilation medicine.anatomical_structure Regional Blood Flow Anesthesia Ankle business Stockings Compression Body Temperature Regulation |
Zdroj: | European Journal of Applied Physiology. 117:921-929 |
ISSN: | 1439-6327 1439-6319 |
DOI: | 10.1007/s00421-017-3581-5 |
Popis: | We investigated whether graduated compression induced by stockings enhances cutaneous vasodilation in passively heated resting humans. Nine habitually active young men were heated at rest using water-perfusable suits, resulting in a 1.0 °C increase in body core temperature. Heating was repeated twice on separate occasions while wearing either (1) stockings that cause graduated compression (pressures of 26.4 ± 5.3, 17.5 ± 4.4, and 6.1 ± 2.0 mmHg at the ankle, calf, and thigh, respectively), or (2) loose-fitting stockings without causing compression (Control). Forearm vascular conductance during heating was evaluated by forearm blood flow (venous occlusion plethysmography) divided by mean arterial pressure to estimate heat-induced cutaneous vasodilation. Body core (esophageal), skin, and mean body temperatures were measured continuously. Compared to the Control, forearm vascular conductance during heating was higher with graduated compression stockings (e.g., 23.2 ± 5.5 vs. 28.6 ± 5.8 units at 45 min into heating, P = 0.001). In line with this, graduated compression stockings resulted in a greater sensitivity (27.5 ± 8.3 vs. 34.0 ± 9.4 units °C−1, P = 0.02) and peak level (25.5 ± 5.8 vs. 29.7 ± 5.8 units, P = 0.004) of cutaneous vasodilation as evaluated from the relationship between forearm vascular conductance with mean body temperature. In contrast, the mean body temperature threshold for increases in forearm vascular conductance did not differ between the Control and graduated compression stockings (36.5 ± 0.1 vs. 36.5 ± 0.2 °C, P = 0.85). Our results show that graduated compression associated with the use of stockings augments cutaneous vasodilation by modulating sensitivity and peak level of cutaneous vasodilation in relation to mean body temperature. However, the effect of these changes on whole-body heat loss remains unclear. |
Databáze: | OpenAIRE |
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