Relation of age and physical exercise status on metabolic rate in younger and older healthy men
Article Abstract:
Fatness and leanness are determined, in part, by the level of physical activity a person engages in; the mechanism has to do with metabolism, or the physical and chemical changes involved in utilizing the food consumed. Young athletes reportedly have a higher resting metabolic rate (RMR) than inactive people of similar age; this means that the number of calories burned to maintain essential body processes while at rest is higher in the athletes. The effects of physical exercise on the metabolic rate of aging men, however, have not been as widely studied. In the present study, 20 healthy men between the ages of 18 and 34 years and 16 healthy men between the ages of 50 and 78 years were assessed and assigned to one of four groups based upon age (younger or older) and level of physical fitness (active or sedentary). Body fat was estimated, lung capacity was assessed, and RMR and TEM (thermic effect of a meal test, which measures energy expenditure after a meal) were determined for each subject. After consumption of a liquid meal, RMR and TEM were again measured. RMR was the lowest among sedentary older men, compared with the other three groups. TEM was higher in both active groups than in the two sedentary groups. Therefore, a sedentary lifestyle in older men is associated with lower RMR as compared with younger men and physically active older men, and physical exercise increases TEM. The latter relationship between TEM and activity was unaffected by body composition (that is, the amount of fat and lean tissue) or age. (Consumer Summary produced by Reliance Medical Information, Inc.)
Publication Name: Journals of Gerontology
Subject: Seniors
ISSN: 0022-1422
Year: 1991
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Predictors of the age-related increase in blood pressure in men and women
Article Abstract:
Studies of Caucasian males and females of various ages indicate a greater correlation between mean arterial pressure (MAP) and age in women as a result of an enhancement of MAP in women above 62 years. An accumulation of body fat causes MAP increase as a function of age in men, which can be regulated by the suppression of alcohol consumption, fat mass, supine heart rate and sum of nine skinfolds. However, even the control of these four MAP predictor variables does not suppress the correlation between MAP and age in women older than 62 years.
Publication Name: The Journals of Gerontology, Series A
Subject: Seniors
ISSN: 1079-5006
Year: 1995
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Dissociation of changes in metabolic rate and blood pressure with erythrocyte Na-K punp actvity in older men after endurance training
Article Abstract:
The effects of exercise training in 11 elderly males on erythrocyte sodium-potassium (Na-K) pump rate and its possible relationship with changes in resting metabolic rate and blood pressure were assessed by indirect calorimetry, supine blood pressure measurement, underwater weighing and flame photometry using ouabain. Results showed that exercise training increases the resting metabolic rate and decreases blood pressure in older men, however, these changes are not associated with erythrocyte Na-K pump activity.
Publication Name: Journals of Gerontology
Subject: Seniors
ISSN: 0022-1422
Year: 1993
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