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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
Summary
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.
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.
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