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Does oxygen delivery explain interindividual variation in forearm critical impulse?

J Mikhail Kellawan1, Robert F Bentley2, Michael F Bravo2

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|November 22, 2014
PubMed
Summary

Interindividual differences in oxygen delivery explain most variations in forearm critical impulse. Vasodilation and the exercise pressor response contribute to these oxygen delivery differences.

Keywords:
Aerobic capacitycritical powerexercise hyperemiaforearm exercisepressor response

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Area of Science:

  • Exercise Physiology
  • Cardiovascular Physiology
  • Skeletal Muscle Physiology

Background:

  • Critical power is a key determinant of endurance performance.
  • Oxygen (O2) delivery influences critical power within individuals.
  • Interindividual variability in O2 delivery may explain differences in critical impulse.

Purpose of the Study:

  • To investigate if interindividual differences in forearm O2 delivery account for variations in forearm critical impulse.
  • To examine the relationship between O2 delivery and critical impulse during maximal effort exercise.

Main Methods:

  • Ten healthy men performed rhythmic handgrip exercise to exhaustion.
  • Forearm blood flow (FBF) and mean arterial pressure (MAP) were measured.
  • Oxygen delivery and forearm vascular conductance (FVC) were calculated.

Main Results:

  • Significant interindividual variation existed in both O2 delivery and critical impulse.
  • Oxygen delivery explained most of the differences in critical impulse (r(2) = 0.85).
  • Vasodilation and the exercise pressor response independently influenced forearm O2 delivery.

Conclusions:

  • Interindividual differences in forearm O2 delivery are the primary driver of variations in critical impulse.
  • Individual differences in vasodilation and pressor response contribute to O2 delivery heterogeneity.
  • The origins of this physiological heterogeneity require further investigation.