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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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THE DIFFERENCE IN RESPIRATORY AND BLOOD GAS VALUES DURING RECOVERY AFTER EXERCISE WITH SPONTANEOUS VERSUS REDUCED BREATHING FREQUENCY |
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Jernej Kapus  ,
Anton Ušaj, Venceslav Kapus and Boro Štrumbelj |
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University of Ljubljana, Faculty of Sport, Laboratory of Biodynamics, Slovenia. |
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© Journal of Sports Science and Medicine (2009) 8, 452 - 457 |
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| ABSTRACT | |||
| Extrapolation from post-exercise measurements has been used to
estimate respiratory and blood gas parameters during exercise. This may
not be accurate in exercise with reduced breathing frequency (RBF), since
spontaneous breathing usually follows exercise. This study was performed
to ascertain whether measurement of oxygen saturation and blood gases immediately
after exercise accurately reflected their values during exercise with RBF.
Eight healthy male subjects performed an incremental cycling test with RBF
at 10 breaths per minute. A constant load test with RBF (B10) was then performed
to exhaustion at the peak power output obtained during the incremental test.
Finally, the subjects repeated the constant load test with spontaneous breathing
(SB) using the same protocol as B10. Pulmonary ventilation (VE), end-tidal
oxygen (PETO2), and carbon dioxide pressures (PETCO2)
and oxygen saturation (SaO2) were measured during both constant
load tests. The partial pressures of oxygen (PO2) and carbon
dioxide (PCO2) in capillary blood were measured during the last
minute of exercise, immediately following exercise and during the third
minute of recovery. At the end of exercise RBF resulted in lower PETO2,
SaO2 and PO2, and higher PETCO2 and PCO2
when compared to spontaneous breathing during exercise. Lower SaO2
and PETO2 were detected only for the first 16s and 20s of recovery
after B10 compared to the corresponding period in SB. There were no significant
differences in PO2 between SB and B10 measured immediately after
the exercise. During recovery from exercise, PETCO2 remained
elevated for the first 120s in the B10 trial. There were also significant
differences between SB and B10 in PCO2 immediately after exercise.
We conclude that RBF during high intensity exercise results in hypoxia;
however, due to post-exercise hyperpnoea, measurements of blood gas parameters
taken 15s after cessation of exercise did not reflect the changes in PO2
and SaO2 seen during exercise. Key words: Constant load test, reduced breathing frequency, recovery, respiratory parameters, oxygen saturation, blood gas. |
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