Transition from rest to exercise: a breath-by-breath analysis of the cardiorespiratory response
Item
- Title
- Transition from rest to exercise: a breath-by-breath analysis of the cardiorespiratory response
- Author(s)
- Konczynski Mathilde
- Abstract
-
OBJECTIVE: The aim of this study was to describe the breath by breath evolution of the cardiorespiratory response indicators during transition from rest to exercise, and to compare their evolution with regards to timing and to the level of physical fitness.METHOD: Sixteen male volunteers were recruited from the British College of Osteopathic Medicine student body, and classified into one of two groups according to fitness level; Trained or Untrained.
All subjects followed an identical standardised procedure, whereby each subject attended an initial habitual session, followed by the cardiopulmonary exercise test on the treadmill, one week later.
The subjects were seated at rest for five minutes, standing at rest for five minutes, and walking progressively faster on the treadmill, with an acceleration of 0.5 km/hr, until their respiratory exchange ratio (RER) reached the value of 1.0, when the test was terminated. In each case, VO2, VCO2; VE, RER, and HR were measured throughout, on a breath by breath basis, using a stationary metabolic stress test system, the MetaLyzer 3B(. The values were then averaged over intervals of 30 seconds, from the first to the fifteenth minute of the test.
RESULTS: Cardiorespiratory parametres were plotted against time and corresponding graphs discussed, and mean values were calculated for each parametre, for each group. The matched pair data were analysed statistically using a Student's t-test, to compare Trained and Untrained groups over the 15 minutes. Results showed that there was a significant difference between Trained and Untrained responses at the onset of exercise. Other variables were measured and compared using a Student's t-test for unpaired data; results showed that resting values of VO2 did not depend on level of training or body composition, that time to 50% VO2peak, percentage of VO2peak at 15 minutes and ratio of lean VO2rest to lean VO2peak were significantly different in the two groups. Significance level was set at
P = 0.05 for all statistical tests.
CONCLUSION: The indicators of the cardiorespiratory response all changed rapidly on transition from rest to exercise. Their evolution was different in Trained and Untrained individuals, and related to both VO2peak and body composition. By providing an overview of the cardiorespiratory response during the transition from rest to exercise, this study helps to widen the understanding of exercise physiology in healthy subjects, and contributes to the development of exercise prescription, fitness level assessment, progress grading, and may assists in the diagnosis and treatment of cardiorespiratory conditions. - presented at
- British College of Osteopathic Medicine
- Date Accepted
- 0
- Date Submitted
- 1.1.1970 00:00:00
- Type
- osteo_thesis
- Language
- English
- Submitted by:
- 62
- Pub-Identifier
- 13640
- Inst-Identifier
- 1076
- Recommended
- 0
- Item sets
- Thesis
Konczynski Mathilde, “Transition from rest to exercise: a breath-by-breath analysis of the cardiorespiratory response”, Osteopathic Research Web, accessed May 5, 2025, https://www.osteopathicresearch.org/s/orw/item/1117