Effects of nitrate on the power-duration relationship for severe-intensity exercise.

@article{Kelly2013EffectsON,
  title={Effects of nitrate on the power-duration relationship for severe-intensity exercise.},
  author={James F. Kelly and Anni Vanhatalo and Daryl P. Wilkerson and Lee J. Wylie and Andrew M. Jones},
  journal={Medicine and science in sports and exercise},
  year={2013},
  volume={45 9},
  pages={
          1798-806
        }
}
PURPOSE The power asymptote (critical power [CP]) and curvature constant (W') of the power-duration relationship dictate the tolerance to severe-intensity exercise. We tested the hypothesis that dietary nitrate supplementation would increase the CP and/or the W' during cycling exercise. METHODS In a double-blind, randomized, crossover study, nine recreationally active male subjects supplemented their diet with either nitrate-rich concentrated beetroot juice (BR; 2 × 250 mL·d, ∼8.2 mmol·d… 
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and tolerance

Oral taurine improves critical power severe intensity exercise and estimated performance at a range of severe work intensities and time to exhaustion 5% > critical power (TTE) and the estimated time to complete (T lim) arange of fixed target intensities.

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Oral taurine improves critical power and severe-intensity exercise tolerance

Acute supplementation of 50 mg kg−1 of taurine improved CP and estimated performance at a range of severe work intensities and estimated time to complete (Tlim) arange of fixed target intensities.

Effects of a single dose of beetroot juice on cycling time trial performance at ventilatory thresholds intensity in male triathletes

The findings do not support an improvement in the variables examined in response to acute BJ supplementation, and probably, higher doses are needed for improving time trial performance in male triathletes during a cycle ergometer test conducted at a load intensity equivalent to the first and second ventilatory threshold.

The effect of dietary nitrate supplementation on the spatial heterogeneity of quadriceps deoxygenation during heavy‐intensity cycling

Dietary NO3− supplementation increased O2 diffusive conductance across locomotor muscles in association with improved V˙ O2 dynamics during heavy‐intensity cycling transitions and significantly increased the mean (three‐site) end‐exercise deoxy [Hb + Mb]
...

References

SHOWING 1-10 OF 47 REFERENCES

Dietary nitrate supplementation reduces the O2 cost of low-intensity exercise and enhances tolerance to high-intensity exercise in humans.

The reduced O2 cost of exercise following increased dietary nitrate intake has important implications for the understanding of the factors that regulate mitochondrial respiration and muscle contractile energetics in humans.

Acute dietary nitrate supplementation improves cycling time trial performance.

It is suggested that acute dietary nitrate supplementation with 0.5 L of BR improves cycling economy, as demonstrated by a higher PO for the same VO2 and enhances both 4- and 16.1-km cycling TT performance.

The effect of oral creatine supplementation on the curvature constant parameter of the power-duration curve for cycle ergometry in humans.

The results indicated that Cr and/or PCr content in muscles seems to be one of the important determinants of the curvature constant parameter (W') of the power-duration hyperbolic curve for cycle ergometry.

Acute and chronic effects of dietary nitrate supplementation on blood pressure and the physiological responses to moderate-intensity and incremental exercise.

It is indicated that dietary NO(3)(-) supplementation acutely reduces BP and the O(2) cost of submaximal exercise and that these effects are maintained for at least 15 days if supplementation is continued.

Dietary nitrate supplementation enhances muscle contractile efficiency during knee-extensor exercise in humans.

The reduced O(2) cost of exercise following dietary NO(3)(-) supplementation appears to be due to a reduced ATP cost of muscle force production.

The curvature constant parameter of the power-duration curve for varied-power exercise.

It is concluded that the work equivalent of W' is not affected by power variations during exhausting cycle ergometry, at least in the P range of 100-134% of CP.

Endurance training enhances critical power.

Whether critical power (CP) assesses the ability to perform continuous aerobic exercise and to determine whether training-induced changes in aerobic endurance are reflected by changes in the slope, but not the y-intercept of the CP function are investigated.

Critical power: implications for determination of V˙O2max and exercise tolerance.

This brief review presents the practical and theoretical foundations for the CP concept, explores rigorous alternative mathematical approaches, and highlights exciting new evidence regarding its mechanistic bases and its broad applicability to human athletic performance.

Oxygen uptake kinetics as a determinant of sports performance

Abstract It is well known that physiological variables such as maximal oxygen uptake ( ), exercise economy, the lactate threshold, and critical power are highly correlated with endurance exercise…

Influence of hyperoxia on muscle metabolic responses and the power–duration relationship during severe‐intensity exercise in humans: a 31P magnetic resonance spectroscopy study

Data indicate that Tlim during severe‐intensity exercise is associated with the attainment of consistently low values of muscle [PCr] and pH, and the CP and W′ parameters of the power–duration relationship were both sensitive to the inspiration of hyperoxic gas.