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  • Diet  (1)
  • Dietary modifications  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Lactate threshold and onset of blood lactate accumulation during incremental exercise after dietary modifications (1988)
    Springer
    European journal of applied physiology 57 (1988), S. 192-197 
    Details
    ISSN: 1439-6327
    Keywords: Lactate threshold ; Onset on blood lactate accumulation ; Dietary modifications
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study was designed to clarify the effects of dietary modifications on the lactate threshold (LT) and on the onset of blood lactate accumulation (OBLA) during progressive incremental exercise. Six healthy males volunteered for the study. Informed consent was obtained from every participant. The following protocol was administered to each subject on three occasions: a 48-h period of mixed dieting (53% carbohydrates, 30% lipids, 17% proteins) preceding the first exercise test, immediately followed by a 48-h period of either a carbohydrate-rich (68% CHO, 23% lipids, 9% proteins) or a fat-rich (19% CHO, 57% lipids, 26% proteins) iso-caloric diet leading to the second exercise and separated from the third test by a 12-days period. Exercise tests were conducted on an electrically-braked ergocycle, and consisted of a progressive incremental maximal exercise. Respiratory parameters were continuously monitored by an automated open circuit sampling system. Exercise blood lactate (LA), free fatty acids (FFA), glucose levels and acid-base balance were determined from venous blood samples obtained through an indwelling brachial catheter. Peak lactate values, workload and performance time were not significantly altered by imposed diets. Furthermore, dietary modifications had no significant effect on LT, OBLA fixed at 4 mmol and ventilatory threshold. Increased pH and FFA mobilization were observed with fat-rich diet, while CHO-rich diet markedly increased the respiratory exchange ratio (R). It is concluded that LT and OBLA are not significantly altered by fat or CHO enrichment of diets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00640662
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of dietary manipulations on blood glucose and hormonal responses following supramaximal exercise (1987)
    Springer
    European journal of applied physiology 56 (1987), S. 109-114 
    Details
    ISSN: 1439-6327
    Keywords: Supramaximal exercise ; Diet ; Blood glucose ; Insulin ; Catecholamines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of supramaximal exercise on blood glucose, insulin, and catecholamine responses were examined in 7 healthy male physical education students (mean±SD: age=21±1.2 years; $$\dot V_{{\text{O}}_{{\text{2 max}}} } $$ =54±6 ml · kg−1 · min−1) in response to the following three dietary conditions: 1) a normal mixed diet (N); 2) a 24-h low carbohydrate (CHO) diet intended to reduce liver glycogen content (D1); and 3) a 24-h low CHO diet preceded by a leg muscle CHO overloading protocol intended to reduce hepatic glycogen content with increased muscle glycogen store (D2). Exercise was performed on a bicycle ergometer at an exercise intensity of 130% $$\dot V_{{\text{O}}_{{\text{2 max}}} } $$ for 90 s. Irrespective of the dietary manipulation, supramaximal exercise was associated with a similar significant (p〈0.01) increase in the exercise and recovery plasma glucose values. The increase in blood glucose levels was accompanied by a similar increase in insulin concentrations in all three groups despite lower resting insulin levels in conditions D1 and D2. Lactate concentrations were higher during the early phase of the recovery period in the D2 as compared to the N condition. At cessation of exercise, epinephrine and norepinephrine were greatly elevated in all three conditions. These results indicate that the increase in plasma glucose and insulin associated with very high intensity exercise, persists in spite of dietary manipulations intended to reduce liver glycogen content or increase muscle glycogen store. These data suggest that the blood glucose increase following supramaximal exercise is most likely related to hepatic glycogenolysis in spite of a substantial decrease in liver glycogen content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696385
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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