Cardiovascular and thermal consequences of protective clothing: a comparison of clothed and unclothed states
| Autor: | Alison L. Fogarty, Brian F. Woods, Christopher J. Gordon, Jodie M. Stocks, Herbert Groeller, Karen A. Armstrong, Nigel A.S. Taylor |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Adult
Male medicine.medical_specialty Cardiac output Hot Temperature Fever Human Factors Physical Therapy Sports Therapy and Rehabilitation Human Factors and Ergonomics Physical exercise Plasma volume Body Temperature SWEAT Cardiovascular Physiological Phenomena Protective Clothing Internal medicine parasitic diseases Medicine Humans Homeostasis Exercise Core (anatomy) business.industry Stroke volume Clothing Surgery Bicycling Blood pressure Blood Circulation Cardiology business |
| Popis: | We have undertaken a laboratory-based examination of the cardiovascular and thermal impact of wearing thermal (heat) protective clothing during fatiguing exercise in the heat. Seven males completed semi-recumbent, intermittent cycling (39.6 degrees C, 45% relative humidity) wearing either protective clothing or shorts (control). Mean core and skin temperatures, cardiac frequency (f(c)), stroke volume (Q), cardiac output (Q), arterial pressure, forearm blood flow (Q(f)), plasma volume change, and sweat rates were measured. In the clothed trials, subjects experienced significantly shorter times to fatigue (52.5 vs. 58.9 min), at lower peak work rates (204.3 vs. 277.4 W), and with higher core (37.9 degrees vs. 37.5 degrees C) and mean skin temperatures (37.3 degrees vs. 36.9 degrees C). There was a significant interaction between time and clothing on f(c), such that, over time, the clothing effect became more powerful. Clothing had a significant main affect on Q, but not Q, indicating the higher Q was chronotropically driven. Despite a greater sweat loss when clothed (923.0 vs. 547.1 g.m(-2) x h(-1); P |
| Databáze: | OpenAIRE |
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