Skip Navigation LinksHome > February 1998 - Volume 30 - Issue 2 > Ventilation and entrainment of breathing during cycling and...
Medicine & Science in Sports & Exercise:
Basic Sciences: Original Investigations

Ventilation and entrainment of breathing during cycling and running in triathletes

BONSIGNORE, MARIA ROSARIA; MORICI, GIUSEPPE; ABATE, PIERO; ROMANO, SALVATORE; BONSIGNORE, GIOVANNI

Collapse Box

Abstract

Purpose: To assess whether entrainment of breathing (E) during exercise: 1) differed according to the test protocol in well-trained triathletes, and 2) improved ventilatory efficiency during exercise.

Methods: Eight triathletes performed three incremental tests until exhaustion: while cycling (CE), while running at increasing grade and constant speed (↑ GRADE) and while running at increasing speed and constant grade (↑ SPEED), respectively. E was evaluated as the percentage of breaths occurring at respiratory rates (F) corresponding to integer ratios of the exercise cycle rate. To assess whether E improved ventilatory efficiency,Δ˙VE/˙VO2 between nonentrained and entrained breaths was measured at each load.

Results: Mean E was higher in CE (57.2 ± 21.9%) than in ↑ GRADE (46.9± 18.7%) and ↑ SPEED (41.4 ± 17.2%). E decreased at high loads in Ce and ↑ SPEED but not in ↑ GRADE. In the group of subjects, E correlated with the degree of fitness (evaluated as˙VO2Tvent/˙VO2peak%) only during ↑ GRADE. By multiple regression analysis on all data, minute ventilation correlated with CO2 production but not with the exercise cycle rate; however, either F or tidal volume correlated significantly with both these variables.˙VE/˙VO2 was lower in entrained than nonentrained breaths at each load in CE and ↑ GRADE experiments, but the difference was small.

Conclusions: In spite of some differences among protocols, triathletes showed significant E during incremental exercise tests. Spontaneous E appeared to slightly improve ventilatory efficiency during CE and ↑ GRADE protocols.

©1998The American College of Sports Medicine

Login

Article Tools

Share

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.

Connect With Us