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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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VENTILATION BEHAVIOR IN TRAINED AND UNTRAINED MEN DURING INCREMENTAL TEST: EVIDENCE OF ONE METABOLIC TRANSITION POINT |
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Flávio O. Pires1  ,
Adriano E. Lima-Silva1,2, Eduardo N. Oliveira1, Eduardo Rumenig-Souza1 and
Maria A.P.D.M. Kiss1 |
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1Department of Sport, School of Physical Education and Sport, São Paulo University, Brazil 2School of Nutrition and Physical Education, Lutheran Educational Association, Brazil |
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© Journal of Sports Science and Medicine (2008) 7, 335 - 343 Search Google Scholar for Citing Articles |
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| ABSTRACT | |||
| This study aimed to describe and compare the ventilation behavior
during an incremental test utilizing three mathematical models and to compare
the feature of ventilation curve fitted by the best mathematical model between
aerobically trained (TR) and untrained (UT) men. Thirty five subjects underwent
a treadmill test with 1 km·h-1 increases every minute until exhaustion.
Ventilation averages of 20 seconds were plotted against time and fitted
by: bi-segmental regression model (2SRM); three-segmental regression model
(3SRM); and growth exponential model (GEM). Residual sum of squares (RSS)
and mean square error (MSE) were calculated for each model. The correlations
between peak VO2 (VO2PEAK), peak speed (SpeedPEAK),
ventilatory threshold identified by the best model (VT2SRM) and the first
derivative calculated for workloads below (moderate intensity) and above
(heavy intensity) VT2SRM were calculated. The RSS and MSE for GEM were significantly
higher (p < 0.01) than for 2SRM and 3SRM in pooled data and in UT, but
no significant difference was observed among the mathematical models in
TR. In the pooled data, the first derivative of moderate intensities showed
significant negative correlations with VT2SRM (r = -0.58; p < 0.01) and
SpeedPEAK (r = -0.46; p < 0.05) while the first derivative of heavy intensities
showed significant negative correlation with VT2SRM (r = -0. 43; p <
0.05). In UT group the first derivative of moderate intensities showed significant
negative correlations with VT2SRM (r = -0.65; p < 0.05) and SpeedPEAK
(r = -0.61; p < 0.05), while the first derivative of heavy intensities
showed significant negative correlation with VT2SRM (r= -0.73; p< 0.01),
SpeedPEAK (r = -0.73; p < 0.01) and VO2PEAK (r = -0.61; p
< 0.05) in TR group. The ventilation behavior during incremental treadmill
test tends to show only one threshold. UT subjects showed a slower ventilation
increase during moderate intensities while TR subjects showed a slower ventilation
increase during heavy intensities.
Key words: Ventilatory threshold, mathematical modeling, ventilatory responses, aerobic training status. |
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