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Biomedical subjects

K B Pandolf

Publications and source records attributed to K B Pandolf.

140 records · Page 8Linked to original sources
PubMed1975

Hyperthermia: effect on exercise prescription.

Ten healthy male university students pedaled a bicycle ergometer (Monark) for three sessions each lasting 30 minutes. Each subject worked at an individually predicted work load corresponding to approximately 40% of maximal aerobic capacity. The same predicted work load was conducted at 24 degrees C, 44 degrees C and 54 degrees C for each subject. For practical purposes, the results reveal approximately a one beat per minute increase in exercise heart rate for each 1 degree C increase in ambient temperature above neutral (24 degrees C). The practice of exercising cardiac patients in hot ambient temperatures which produce potentially hazardous heart rate levels was challenged. Seasonal reevaluation of exercise heart rate prescriptions is of importance. Hopefully, these findings will also be of some importance to various community gymnasiums and to self-motivated joggers.

Adolescent↗
PubMedDate not supplied

Heat tolerance and aging.

Work-heat tolerance has been reported to be generally lower in middle-aged and elderly men and women than in younger men and women. Some authors have suggested that physically fit older men have fewer decrements in performance during work-heat stress than do less fit men of the same age. However, none of the studies matched older and younger individuals on any pertinent physiological or morphological variables. Recently, four different researchers have reported results of studies in which men or women differed in average age by 25 to 36 years but were matched for body weight, surface area, surface area: body weight ratio, percentage of body fat, and maximal aerobic power. Evidence from three of these studies indicated little impairment of the thermoregulatory system during acute work-heat stress or heat acclimation in these men and women, at least through the seventh decade of life. One of the four studies did indicate higher core temperatures and lower sweating rates in middle-aged women than in younger women after heat acclimation; however, the length of time the heat could be tolerated did not differ between these matched groups. These observations generally support the importance of aerobic fitness and other morphological factors to middle-aged and elderly individuals working or performing recreational activities in hot environments.

Adolescent↗
PubMedDate not supplied

Aging and human heat tolerance.

Collectively, the literature on heat tolerance suggests that middle-aged (45- to 64-year-old) men and women are more work-heat-intolerant and suffer more physiological strain during heat acclimation than younger individuals. However, it is unclear whether the age differences in work-heat intolerance and physiological strain during heat acclimation are related to age per se or associated with other factors such as certain disease states, decreased physical activity, or lowered aerobic fitness. In contrast, the work-heat tolerance and physiological responses during heat acclimation of habitually active or aerobically trained middle-aged men are the same as or better than younger individuals. The reviewed studies emphasize the importance of aerobic fitness and pertinent morphological factors, such as body fat, body weight, and surface area in maintaining work-heat tolerance with aging. Recent studies suggest that middle-aged and older men and women may be more susceptible to greater heat strain at physiologically significant levels of dehydration than those younger. However, additional research appears necessary to support this hypothesis. When the effects of chronic debilitating diseases in the elderly (64 years old and older) are minimized, their heat tolerance and thermoregulatory responses are comparable to those of younger individuals. In fact, healthy and well acclimated elderly men and women appear to perform as well as younger individuals during desert walks in dry heat. This review discusses experimental observations from previously published studies concerning aging and heat tolerance or the physiological heat strain during heat acclimation at rest or during work; and it suggests future research efforts needed to understand this topic better.

Aging↗