Total Body, Plasma and Erythrocyte Potassium and Leucocyte Ascorbic Acid in ‘Ultra-Fit’ Subjects

Boddy, K.; Hume, Robert; King, Priscilla C.; Weyers, Elspeth; Rowan, T

doi:10.1042/cs0460449

Cited by 10 publications

(6 citation statements)

References 5 publications

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“…A group of professional football players had lower vitamin C leukocyte values at midseason than before the season had started. After vigorous exercise the leukocyte count increased significantly with a correspondingly reduced leukocyte content of vitamin C [52]. These results correspond to findings of a decreased leukocyte vitamin C concentration after stressful events such as surgery or myocardial infarction [53].…”

Section: Effect Of Exertion On Vitamin C Loss or Mobilizationsupporting

confidence: 86%

The role of vitamin C in athletic performance.

Gerster

1989

Journal of the American College of Nutrition

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There is widespread belief among athletes that special nutritional practices--in particular high-protein diets--will enhance their achievements in competition. Supplementation with vitamins, especially vitamin C, is equally popular. But because genetic predisposition, hard physical training and psychological factors play a most important role in determining performance, and because any potential difference in achievement will be small, it is almost impossible to obtain scientific evidence of a beneficial effect of a particular nutrient. There have been many investigations during the past four decades of the potential effect of high-dose vitamin C supplementation on physical performance. The variables used have included maximum oxygen uptake, blood lactic acid levels, and heart rate after exercise, and in some cases performance was assessed in competitive events. The results have been equivocal: Most studies could not demonstrate an effect. On the other hand, a suboptimal vitamin C status results in an impaired working capacity which can be normalized by restoring vitamin C body pools. Athletes, who follow irrational, unhealthy eating patterns often not including vitamin-C-containing fruit and vegetables, are in need of nutrition education.

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Section: Effect Of Exertion On Vitamin C Loss or Mobilizationsupporting

confidence: 86%

The role of vitamin C in athletic performance.

Gerster

1989

Journal of the American College of Nutrition

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“…The failure of adrenal stimulation to influence the serum ascorbic acid is clearly illustrated in the subjects who received infusions of tetracosactrin, while the demand of the damaged myocardium for excess ascorbic acid has previously been shown (Hume et al, 1972). Further support for the hypothesis that a 'target site' is necessary before the serum ascorbic acid will fall is the observation made on 31 professional footballers that after a period of severe strenuous exercise there is a rise in the white blood cell count and a fall in the leucocyte ascorbic acid (Boddy et al, 1974), but there was no significant change in the serum ascorbic acid levels which were 80 ±28 ,umol/l before and 97 ±34 Fmol/l after the exercise (t=1-8574, P>0-05) (unpublished observation).…”

Section: Discussionmentioning

confidence: 89%

Reassessment of changes in leucocyte and serum ascorbic acid after acute myocardial infarction.

Vallance¹,

Hume²,

Weyers³

1978

Heart

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“…In professional football players, athletes and other highly trained sportsmen, for example, total body potassium may be significantly higher than in control healthy subjects taking average exercise (Norak, Hyatt & Alexander, 1968;Boddy, Hume, King, Weyers & Rowan, 1974). Three individuals measured during our study were muscular athletic men.…”

Section: Muscular and Thin Individualsmentioning

confidence: 95%

Total Body Potassium and Body Fat Estimation in Relationship to Height, Sex, Age, Malnutrition and Obesity

1975

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1. Total body potassium was estimated by 40-K measurement with a high-sensitivity whole body counter in normal individuals over a wide age range and in patients who were obese or were grossly wasted as a result of various conditions which restricted food intake. 2. Potassal males and females, but when individuals of different age groups were matched for height, a significant fall in total body potassium with increasing age was observed only in males. Total body potassium of females was about 75% that of males of similar height when young, the sex difference decreasing with ageing. In the normal population, total body potassium was significantly correlated with height and with weight; regression equations for various relationships are given. 3. Fat-free mass was estimated from total body potassium, values of 65 and 56 mmol of potassium/kg fat-free mass being used for males and females respectively. Body fat estimated by this method correlated well with skinfold measurements over a wide range of body weight but in malnourished individuals having inadequate food intake there was considerable fat-free mass from total body potassium appear unsatisfactory in malnutrition. Considerable differences between expected and observed values of total body potassium were found in muscular individuals and in normal individuals who were thin but whose body weight was relatively constant. 4. The patients with malnutrition were low both in body fat as estimated by skinfold thcikness and in total body potassium estimated on the basis of height. Plasma potassium was, however, normal and potassium supplements did not increase the total body potassium. 5. Total body potassium of obese individuals was not significantly different from that of normal weight individuals on the basis of height. Total body potassium fell on weight reduction with a very low energy diet of 1260 kJ (300 kcal.) daily but changed little with a 3300 kJ (800 KCAY POTASSIUM WAS BEST PREDICTED FROM THE INDIVIDUAL'S HEIGHT. For those whose body weight was less than expected, the use of weight gave the best prediction but the error was considerable when the weight deviation was large.

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Total Body, Plasma and Erythrocyte Potassium and Leucocyte Ascorbic Acid in ‘Ultra-Fit’ Subjects

Cited by 10 publications

References 5 publications

The role of vitamin C in athletic performance.

The role of vitamin C in athletic performance.

Reassessment of changes in leucocyte and serum ascorbic acid after acute myocardial infarction.

Total Body Potassium and Body Fat Estimation in Relationship to Height, Sex, Age, Malnutrition and Obesity

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