Vol. 6, No 2, 2008 pp. 115 - 123
UDC 796.42
Scientific Paper
PROBLEMS IN DETERMINATION OF THE VENTILATORY
THRESHOLD BASED
ON THE RESPIRATORY EXCHANGE RATIO IN HIGH-LEVEL ATHLETES
Stanislav Tzvetkov1, Peter Bonov2,
Daniela Dasheva2
1Department of Sports Medicine, National
Sports Academy, St. grad, 1710 Sofia, Bulgaria,
2National Sports Academy, St. grad,
1710 Sofia, Bulgaria,
E-mail: st.tzvetkov@gmail.com,
bonov@nsa.bg, dani_dash@yahoo.com
Abstract. As an alternative to the invasive lactate anaerobic threshold
determination, a number of methods for detection of the ventilatory threshold
(VT) are applied – using the respiratory exchange ratio (VTRER=1.0),
the breakpoint of the nonlinear increase of the ventilatory equivalent
for oxygen (VTEqO2) and the Vco2 versus Vo2 curve (VTV-slope). Some researchers
identify a respiratory compensation point (RCP); others question the accuracy
of the VTRER method. We aimed to compare the results for VTRER=1.0, VTEqO2,
VTV-slope and RCP in 18 high-level male athletes who are involved in aerobic
sports. In the One-Way ANOVA test a significant difference was demonstrated
between the corresponding values of VO2 and WC (F = 7.95 and F = 14.53;
p < 0.05) in the pairs VTV-slope - VTRER=1.0, VTV-slope - RCP, VTEqO2
- VTRER=1.0 and VTEqO2 - RCP. The multiple pair-wise comparison analysis
for VO2 and WC revealed a lack of statistically acceptable interchangeability
of VTRER=1.0 with VTV-slope and VTEqO2.
Key words: respiratory exchange gases, ventilatory threshold,
comparative analysis
PROBLEM ODREĐIVANJA VENTILATORNOG PRAGA
BAZIRANOM NA
RASPONU RESPIRATORNE RAZMENE KOD VRHUNSKIH SPORTISTA
Kao alternativu invazivniom određivanju laktatnog anaerobnog praga, brojne
metode detekcije ventilatornog praga (VT) su korišćene – upotrebom
raspona respiratorne razmene (VTRER=1.0), tačka prekida nelinearnog povećanja
ventilatornog ekvivalenta za kiseonik (VTEqO2) i kriva Vco2 u odnosu na
Vco2 (VTV-slope). Neki autori identifikuju tačku respiratorne kompenzacije
(RCP), drugi postavljaju pitanje tačnosti VTRER metode. Cilj je bio da
se uporede rezultati za VTRER=1.0, VTEqO2, VTV-slope i RCP kod 18 muškaraca,
visoko kvalitetnih sportista iz aerobnih sportova. U One-Way ANOVA testu
značajnosti razlika je pokazano da postoje uzajamne vrednosti VO2 i radnog
kapaciteta (F = 7,95 and F = 14,53; p < 0,05) u paru VTV-slope - VTRER=1.0,
VTV-slope - RCP, VTEqO2 - VTRER=1.0 i VTEqO2 - RCP. Višestruka parovna
komparativna analiza za VO2 i radni kapacitet otkrila je nedostatak prihvatljive
statističke uzajamnosti VTRER=1.0 sa VTV-slope i VTEqO2.
Ključne reči: respiratorna razmena gasova, ventilatorni prag,
comparativna analiza
