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Using Thorax Expansion to Detect a Ventilatory Inflection Point in the Field.

C Heyde1, H Mahler1, A Gollhofer1

  • 1Department of Sport and Sport Science, Albert Ludwigs Universtity Freiburg, Freiburg, Germany.

International Journal of Sports Medicine
|November 4, 2015
PubMed
Summary
This summary is machine-generated.

A new method using thorax expansion to detect the ventilatory inflection point (VIP) offers a practical way to assess physical fitness outside the lab. This non-invasive technique provides reliable results comparable to traditional methods.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biomedical Engineering

Background:

  • Assessing physical fitness often involves lactate or ventilatory thresholds.
  • Current methods for ventilatory threshold detection require laboratory settings and uncomfortable equipment.

Purpose of the Study:

  • To evaluate a ventilatory inflection point (VIP) derived from thorax expansion as a field-based surrogate for assessing physical fitness.
  • To determine the validity and reliability of VIP detection using respiratory inductance plethysmography (RIP).

Main Methods:

  • Utilized respiratory inductance plethysmography (RIP) to measure thorax expansion during ramp tests.
  • Applied an automated software routine to detect the VIP from RIP data.
  • Compared VIP measurements with the individual anaerobic threshold (IAT) determined by blood lactate sampling.

Main Results:

  • Significant correlations were found between VIP and IAT for speed, heart rate, and ventilation (r=0.840, 0.876, 0.933).
  • Retest variability for VIP was low, with non-systematic differences within ±1.15 km·h⁻¹, ±8.74 b·min⁻¹, and ±12.69 L·min⁻¹.
  • VIP timing reflects ventilatory response efficiency during increased exercise intensity, not solely aerobic capacity.

Conclusions:

  • The ventilatory inflection point (VIP) derived from thorax expansion is a valid and reliable surrogate for assessing physical fitness in field conditions.
  • This non-invasive method using RIP offers a practical alternative to laboratory-based ventilatory threshold assessments.
  • VIP assessment provides insights into the efficiency of ventilatory compensation during exercise.