Effect of exercise on blood volume.

Oscai, L. B.; Williams, B; Hertig, B. A.

doi:10.1152/jappl.1968.24.5.622

Cited by 121 publications

(40 citation statements)

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“…Plasma volume has been found to expand following physical training (16, 21) and heat acclimation (14,25). In the present study, resting values of plasma volume were not significantly increased in any of the groups although all three tended to demonstrate somewhat of a plasma volume expansion following training.…”

Section: Discussioncontrasting

confidence: 51%

Effects on heat tolerance of physical training in water and on land

Avellini¹,

Shapiro²,

Fortney³

et al. 1982

Journal of Applied Physiology

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A 4-wk training program was undertaken by 15 untrained non-heat-acclimated males who were divided into three groups matched on maximal aerobic capacity (VO2max) and trained either in water or on land to determine how physical training (PT) in these different media affects heat tolerance. Subjects trained on a cycle ergometer for 1 h/day, 5 days/wk at 75% VO2max, with the exercise intensity progressively increased to maintain a constant training stimulus. Group I exercised on land, whereas groups II and III exercised while immersed to the neck in water of either 32 degrees C (II) or 20 degrees C (III). Daily exercise increased core temperature (Tc) in groups I and II but not in group III. Training elicited similar increases (approximately 15%) in VO2max in the three groups. Before and after PT, all subjects exercised at approximately 30% VO2max for 3 h at 49 degrees C, 20% rh. Compared with before training, groups I and II showed a decrease in final Tc and heart rate (HR) in the posttraining heat exposure. Sweat rate increased 25% in group II but remained the same in group I. Group III demonstrated a decrease in final HR, but final Tc was higher than before training. Sweat rate did not increase in group III and was lower than the other groups. It was concluded that PT can improve the cardiovascular response to dry heat without affecting thermoregulatory capacity. PT appears to enhance heat tolerance only if Tc is permitted to rise during exercise, thus stimulating the temperature-regulating center for heat dissipation.

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Section: Discussioncontrasting

confidence: 51%

Effects on heat tolerance of physical training in water and on land

Avellini¹,

Shapiro²,

Fortney³

et al. 1982

Journal of Applied Physiology

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“…Exercise training expands plasma volume, with the magnitude of the expansion depending on a number of factors, including rate and amount of energy expenditure. The plasma volume response of subjects 60 to 70 years old is not known, but in younger men (mean age, 32 to 37 years), comparable long-term training at a higher absolute intensity 30 or requiring a twofold greater weekly caloric expenditure 31 expanded plasma volume by 6% to 8% (and increased V o^ by 18% to 26%). If older subjects (ages, 60 to 70 years) respond similarly, the 15.9% increase (L/min) in Vo2m« observed in the present study makes it reasonable to assume a plasma volume expansion of 5% in the present subjects.…”

Section: Discussionmentioning

confidence: 99%

Exercise training decreases plasma cholesteryl ester transfer protein.

Seip

Moulin

Cocke

et al. 1993

Arterioscler Thromb

144

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To assess the effect of exercise on the plasma concentration of cholesterol ester transfer protein (CETP) and its possible influence in mediating the exercise-associated redistribution of cholesterol among plasma lipoproteins, we measured plasma CETP in 57 healthy normolipidemic men and women before and after 9 to 12 months of exercise training. The training protocol resulted in significant changes in Vo^.,, (mean±SD, +5-3±3.5 mL • kg" 1 • min" 1 ), body weight (-2.5±3.5 kg), plasma triglycerides (-25.7±36J mg/dL), high-density lipoprotein cholesterol (HDL-C) (+2.6±62 mg/dL), and ratios of total cholesterol to HDL-C (-0.30±0.52) and low-density lipoprotein cholesterol (LDL-C) to HDL-C (-0.18±0.45) (all P^.05) but no change in lipoprotein(a). CETP concentration (in milligrams per liter) fell significantly in response to training in both men (n=28, 2.47±0.66 to 2.12±0.43; % A=14.2%; P<.005) and women (n=29, 2.72±1.01 to 2-J6±0.76; % A=13.2%; P

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“…The improvement in work capacity could have resulted from an elevated blood volume (22). But on the other hand, the additional volume could have decreased work tolerance due to the additional volume and overloading of the heart.…”

Section: Discussionmentioning

confidence: 99%

Elevation of hemoglobin and work tolerance in iron-deficient subjects.

Edgerton

Ohira²,

Hettiarachchi

et al. 1981

Journal of Nutritional Science and Vitaminology, J Nutr Sci Vit

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SummarySelected parameters related to work tolerance were mea sured in 31 adult subjects with hemoglobin (Hb) concentration from 2.5 to 14.0g/100ml. Work tolerance was closely related to Hb concentration (r=0.74) regardless of the adequacy of storage iron level. One male and six females with a mean Hb of 3.5g/100ml (27-55 years old) were studied before and 24hr after transfusing 570ml of whole blood. The mean maximal work load tolerated increased 83% within 24hr after transfusion in these seven subjects. Post-exercise venous blood lactate was markedly lower after transfusion. Work tolerance of these subjects within 24hr after transfusion was the same as in other subjects who had had the equivalent Hb level as the post-transfusion subjects presumably for at least several weeks. These data suggest that the decrement in work performance capacity in iron-deficient and anemic subjects is, in large part, a reflection of the level of anemia rather than other non-Hb related biochemical changes that could accompany prolonged iron deficiency anemia.

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Effect of exercise on blood volume.

Cited by 121 publications

References 0 publications

Effects on heat tolerance of physical training in water and on land

Effects on heat tolerance of physical training in water and on land

Exercise training decreases plasma cholesteryl ester transfer protein.

Elevation of hemoglobin and work tolerance in iron-deficient subjects.

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