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A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers
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'Priming' exercise and O2 uptake kinetics during treadmill running.

Andrew M Jones1, Fred DiMenna, Fiona Lothian

  • 1School of Sport and Health Sciences, St. Luke's Campus, University of Exeter, Heavitree Road, Exeter EX1 2LU, UK. a.m.jones@exeter.ac.uk

Respiratory Physiology & Neurobiology
|March 18, 2008
PubMed
Summary

Priming exercise did not improve oxygen uptake (V(O2)) kinetics during treadmill running. This study found no significant differences in V(O2) speed between the first and second exercise bouts, suggesting priming is ineffective for this modality.

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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice

Published on: March 15, 2019

Area of Science:

  • Exercise Physiology
  • Human Performance
  • Cardiorespiratory Fitness

Background:

  • Priming exercise, a short bout of activity before a main exercise, is known to enhance performance in some modalities.
  • Understanding V(O2) kinetics is crucial for assessing exercise efficiency and cardiorespiratory response.
  • Previous research suggested priming exercise could improve V(O2) kinetics, but its effect on treadmill running was unclear.

Purpose of the Study:

  • To investigate whether priming exercise accelerates oxygen uptake (V(O2)) kinetics during high-intensity treadmill running.
  • To compare the V(O2) response during a second bout of exercise preceded by a 6-minute walk versus a first exercise bout without priming.

Main Methods:

  • Eight healthy subjects performed two identical square-wave treadmill running protocols at 70% of the difference between lactate threshold and V(O2) max speeds.
  • Oxygen uptake was measured breath-by-breath and analyzed using non-linear regression.
  • Heart rate and blood lactate were monitored to confirm physiological elevation before the second bout.

Main Results:

  • No significant differences were observed in the phase II time constant, V(O2) slow component amplitude, or mean response time between the primed and un-primed exercise bouts.
  • Heart rate and blood lactate levels were significantly higher before the second bout, indicating a primed state.
  • The V(O2) kinetics remained consistent, with a time constant of approximately 16 seconds for both conditions.

Conclusions:

  • Priming exercise does not enhance V(O2) kinetics during high-intensity treadmill running in physically active young individuals.
  • The inherent fast V(O2) kinetics and small slow component in the un-primed condition on the treadmill may preclude further enhancement by priming.
  • These findings contrast with previous studies using different exercise modalities, highlighting modality-specific effects of priming exercise.