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Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements
07:19

Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements

Published on: July 29, 2021

Dietary nitrate reduces maximal oxygen consumption while maintaining work performance in maximal exercise.

Filip J Larsen1, Eddie Weitzberg, Jon O Lundberg

  • 1Department of Physiology and Pharmacology, Swedish School of Sport and Health Sciences, Karolinska Institutet, 11486 Stockholm, Sweden. filip.larsen@ki.se

Free Radical Biology & Medicine
|November 17, 2009
PubMed
Summary

Dietary nitrate supplementation, found in vegetables like spinach, reduces maximal oxygen consumption (VO2max) during intense exercise. This suggests nitrate may improve muscle energy efficiency, potentially increasing exercise endurance.

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Area of Science:

  • Exercise Physiology
  • Nutritional Biochemistry
  • Sports Science

Background:

  • Dietary nitrate is a precursor to nitric oxide (NO), influencing physiological processes.
  • Nitrate reduction to NO is enhanced under low oxygen and acidosis.
  • Previous research indicated nitrate reduces oxygen consumption during submaximal exercise.

Purpose of the Study:

  • To investigate the effects of dietary nitrate supplementation on physiological and biochemical parameters during maximal exercise.
  • To determine if nitrate influences oxygen consumption and exercise performance at peak exertion.

Main Methods:

  • A randomized, double-blind, placebo-controlled crossover study involving nine healthy volunteers.
  • Participants received sodium nitrate (0.1 mmol/kg/day) or placebo (NaCl) for two days prior to testing.
  • Maximal exercise tests involved incremental arm and leg cranking to exhaustion.

Main Results:

  • Dietary nitrate significantly reduced maximal oxygen consumption (VO2max) (P<0.05).
  • Time to exhaustion showed a trend towards increase with nitrate supplementation (P=0.13).
  • A correlation was observed between changes in time to exhaustion and VO2max (R²=0.47, P=0.04).

Conclusions:

  • Moderate dietary nitrate intake significantly reduces VO2max during maximal exercise involving large muscle groups.
  • The reduction in VO2max with a trend towards increased endurance suggests distinct mechanisms of action.
  • Nitrate may reduce oxygen requirements and enhance the energetic efficiency of working muscles.