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Three men and three women were exposed to transients of air temperature (range, 16--48 degrees C). Whole-body sweating rate, local tissue heat flows, and O2 consumption in the cold were linearly related to a weighted sum of tympanic and mean skin temperatures, called "central drive," During changes in air temperature, changes in subjects' scaled estimates(More)
INTRODUCTION Exertional heat illness (EHI) is a recurrent problem for both male and female recruits during basic military training. A matched case control study investigated the effects of fitness and conditioning on EHI risk among Marine Corps recruits during 12 wk of basic training at Marine Corps Recruit Depot, Parris Island, SC. METHODS Physical(More)
To determine the role of neurotransmitter in the response of forearm blood flow (ABF) to local (forearm) skin temperature (Tsk) we measured ABF of six subjects at Tsk from 25 to 40 degrees C before (control) and after brachial plexus block (BPB). Control experiments were conducted in an ambient temperature of 27-29 degrees C, adjusted to minimize the(More)
To determine the influence of hydration state upon circulatory controls, we studied four relatively fit subjects during duplicate 30-min cycle ergometer exercise bouts (55% VO2max) in euhydrated, hypohydrated, and hyperhydrated conditions. Ambient temperature was 35 degrees C. Hypohydration was achieved by 4 days of diuretic administration and resulted in a(More)
Six subjects exercised (60% VO2 max) in a 35 degree C environment on the day prior to (C1) and 1 h after withdrawal (PW) of 10% of each subject's blood volume, and 2 wk later on the day prior to (C2) and 1 h after infusion (PI) of the stored blood. Esophageal and mean skin temperatures (Tes and Tsk), forearm blood flow (FBF), cardiac output (Q), heart rate(More)
In Figure 13 we have tried to summarize the interactions of thermal and nonthermal control of effector responses, the effects these responses have on the body during exercise, and the ways the changing state of the body feeds back on the central control systems. These systems were depicted in Figure 3 and are included in condensed form in Figure 13.(More)
Eight subjects underwent an exercise training program (10 days at 75% VO2max for 1 h/day at 25 degrees C db/13 degrees C wb) and a heat-acclimation program (10 days at 50% VO2max for 1 h/day at 35 degrees C db/32 degrees C wb). The relations of chest sweat rate and of forearm blood flow to internal temperature were determined for each subject at a 25(More)
A matched population-based case-control study was conducted on exertional heat illness (EHI) in male Marine Corps recruits in basic training at Parris Island, SC. Physical fitness and anthropometric measurements were obtained for 391 of 528 cases of EHI identified in this population during 1988-1992, and 1467 of 1725 controls matched to cases by initial(More)