Abstract
The aim of this study was to determine the effects of a prior run on
the cardiorespiratory responses measured during a subsequent cycle segment.
Twelve duathletes underwent three successive laboratory trials at an interval
of one week: 1) an incremental cycle test, 2) 20 min of running followed
by 20 min of cycling (RC), and 3) 20 min of control cycling (C)
at the same intensity as the cycling segment of RC. Ventilatory data were
collected every minute using a breath-by-breath automated system. Blood samples
were collected to measure venous blood lactate concentration, [La], at rest,
after the running and cycling segments of RC and after C. The results showed
that the C segment of RC had significantly higher V˙E ,
V˙E /V˙O2 , f and HR than C alone and significantly
lower VT (p < 0.05) than C alone. Moreover, steady state
during C of RC was reached at the 2nd min for V˙O2 ,
V˙E , V˙CO2 ,
V˙E /V˙O2 ,
V˙E /V˙CO2 , and V˙T; at the 4th min for R and
HR, and at the 5th min for f. The C of RC induced a significant increase in
[La] in comparison with C alone. We concluded that the first minute of cycling
after running during an RC trial induced specific metabolic and
cardiorespiratory responses.
Key words
Duathlon · cardiorespiratory variables · run-cycle
transition
References
galy.o@wanadoo.fr
