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Peripheral circulation indicators in veteran trail runners.

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  • 1Institute of Physical Education, Sport and Tourism, Peter the Great St. Petersburg Polytechnic University, Russia.

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Veteran trail runners showed a two-stage microcirculation response in hypoxic and mid-altitude conditions. Peripheral circulation assessment in simulated hypoxia can gauge readiness for high-altitude endurance events.

Keywords:
Middle altitudePeripheral circulationVeteran trail runners

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Area of Science:

  • Sports Medicine
  • Cardiovascular Physiology
  • Environmental Physiology

Background:

  • Competitive trail running places significant stress on the cardiovascular system of veteran athletes.
  • Understanding microcirculation dynamics is crucial for optimizing performance and preventing adverse events in endurance sports.
  • Hypoxic and mid-altitude environments present unique physiological challenges for athletes.

Purpose of the Study:

  • To evaluate the microcirculation parameter dynamics in veteran trail runners under hypoxic and mid-altitude conditions.
  • To assess the impact of simulated mid-altitude hypoxia on peripheral circulation in master athletes.
  • To determine the relationship between microcirculation changes and vasomotor activity during high-altitude exposure.

Main Methods:

  • Seven male veteran runners (50-60 years) were studied during mid-altitude competition (1,500-2,000m) and in a simulated hypoxic chamber (16% oxygen).
  • Peripheral circulation was monitored using a laser Doppler flowmeter on the distal phalange of the second finger.
  • Microcirculation parameter (standard deviation of erythrocyte flow vibration) and coefficient of variation (vasomotor activity) were assessed over 720 minutes.

Main Results:

  • A biphasic change in microcirculation was observed in hypoxia: an initial decrease at 360 minutes followed by a compensatory increase at 720 minutes.
  • The coefficient of variation indicated increased vasomotor activity (12.4% to 18.2%) during peak training load in hypoxic mid-altitude, decreasing before competition.
  • Similar microcirculation dynamics were noted during actual mid-altitude competition.

Conclusions:

  • Veteran runners exhibit a two-stage microcirculation response (initial fall, then recovery) in both simulated hypoxic and actual mid-altitude environments.
  • Peripheral circulation assessment in simulated hypoxia is a viable method for evaluating veteran athletes' readiness for mid-altitude trail running.
  • These findings aid in optimizing training and preparation strategies for endurance athletes competing at altitude.