Effect of dietary modifications on lactate threshold and onset of blood lactate accumulation during incremental exercise

1984 ◽  
Vol 53 (3) ◽  
pp. 200-205 ◽  
Author(s):  
Takayoshi Yoshida
Keyword(s):  
Blood Lactate ◽  
Lactate Threshold ◽  
Incremental Exercise ◽  
Lactate Accumulation ◽  
Blood Lactate Accumulation ◽  
Dietary Modifications

Effect of inspired O2 concentration on leg lactate release during incremental exercise

1996 ◽  
Vol 81 (1) ◽  
pp. 246-251 ◽  
Author(s):  
D. R. Knight ◽  
D. C. Poole ◽  
M. C. Hogan ◽  
D. E. Bebout ◽  
P. D. Wagner
Keyword(s):  
Blood Lactate ◽  
Power Output ◽  
Incremental Exercise ◽  
Venous Blood Flow ◽  
Maximal Power ◽  
Maximal Power Output ◽  
Lactate Accumulation ◽  
Lactate Release ◽  
O2 Concentration ◽  
Blood Lactate Accumulation

The normal rate of blood lactate accumulation during exercise is increased by hypoxia and decreased by hyperoxia. It is not known whether these changes are primarily determined by the lactate release in locomotory muscles or other tissues. Eleven men performed cycle exercise at 20, 35, 50, 92, and 100% of maximal power output while breathing 12, 21, and 100% O2. Leg lactate release was calculated at each stage of exercise as the product of femoral venous blood flow (thermodilution method) and femoral arteriovenous difference in blood lactate concentrations. Regression analysis showed that leg lactate release accounted for 90% of the variability in mean arterial lactate concentration at 20-92% maximal power output. This relationship was described by a regression line with a slope of 0.28 +/- 0.02 min/l and a y-intercept of 1.06 +/- 0.38 mmol/l (r2 = 0.90). There was no effect of inspired O2 concentration on this relationship (P > 0.05). We conclude that during continuous incremental exercise to fatigue the effect of inspired O2 concentration on blood lactate accumulation is principally determined by the rate of net lactate release in blood vessels of the locomotory muscles.

The effect of acute thermal dehydration on blood lactate accumulation during incremental exercise

1984 ◽  
Vol 2 (2) ◽  
pp. 105-111 ◽  
Author(s):  
Penelope England ◽  
Scott K. Powers ◽  
Stephen Dodd ◽  
Thomas Callender ◽  
Ellen Brooks
Keyword(s):  
Blood Lactate ◽  
Incremental Exercise ◽  
Thermal Dehydration ◽  
Lactate Accumulation ◽  
Blood Lactate Accumulation

Muscle respiratory capacity and fiber type as determinants of the lactate threshold

1980 ◽  
Vol 48 (3) ◽  
pp. 523-527 ◽  
Author(s):  
J. L. Ivy ◽  
R. T. Withers ◽  
P. J. Van Handel ◽  
D. H. Elger ◽  
D. L. Costill
Keyword(s):  
Blood Lactate ◽  
Lactate Threshold ◽  
Fiber Type ◽  
Work Rate ◽  
Respiratory Capacity ◽  
Lactate Accumulation ◽  
Blood Lactate Accumulation ◽  
Slow Twitch ◽  
The Absolute ◽  
Slow Twitch Fibers

This study examined the relationship between the respiratory capacity of an individual's skeletal muscle and the work rate at which blood lactate accumulation begins (lactate threshold). Comparisons were also made among fiber type, VO2max, and the lactate threshold. Muscle biopsies were taken from the vastus lateralis muscle for determination of respiratory capacity and fiber type (myosin ATPase). The lactate threshold was assessed in terms of both the absolute work rate (VO2) and relative work rate (%VO2max). The capacity of muscle homogenates to oxidize pyruvate was significantly (P less than 0.01) related to the absolute (r = 0.94) and relative (r = 0.83) lactate thresholds. Significant positive correlations (P less than 0.01) were also found between the percent of slow-twitch fibers and absolute (r = 0.74) and relative (r = 0.70) lactate thresholds. The results suggest that the muscle's respiratory capacity is of primary importance in determining the work rate at which blood lactate accumulation begins. They also suggest that the proportion of slow-twitch fibers may play an important role in determining the relative lactate threshold.

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