Determination of Anaerobic Threshold by the Ventilation Equivalent in Normal Individuals

Abstract

In 131 untrained healthy volunteers, unsteady-state upright bicycle ergometry was carried out by means of computer-assisted on-line ergospirometry. In 11 males and 4 females capillary lactate and blood gas analyses sampled simultaneously at 1-min intervals revealed that it is possible to determine the ‘anaerobic threshold’ (AT) and a ‘threshold of decompen-sated metabolic acidosis’ (TDMA) from the respiratory gas exchange by controlling the ventilation equivalent for oxygen (VE_O2 = V_E/V_O2) and carbon dioxide (VE_CO2 = V_E/V_CO2). There is no necessity of invasive measurements. Solely ergospirometrical tests in 66 males and 50 females, aged 20–65 years, showed the expected higher work load levels and V_O2 at AT and TDMA in males. There was a significant negative correlation to age. In contrast, there are no differences with regard to sex in AT and TDMA for weight-corrected work rates. In the age group 20–39 years, AT is at about 1 W/kg body weight, TDMA at about 2 W/kg body weight. The larger maximum exercise capacity weight corrected for males (3 W/kg) in comparison to females (2.6 W/kg) was dependent on a greater capability in the range of maximum exertion and not on a different level of AT and TDMA.

Influence of the ten sessionsof the whole body cryostimulationon aerobic and anaerobic capacity

“…To determine AT, the maximum value of FEO 2 , significant increase in VE and the minimum value of VE . VO 2 -1 were used, while maximum value of FECO 2 , significant increase in VE, and the minimum value of VE×VCO 2 -1 were used for the determination of AnT [28]. The Wingate test was preformed to assess anaerobic power and capacity of all participants [29].…”

Correlação entre qualidade de vida e capacidade funcional na insuficiência cardíaca

“…Encouragement phrases were said during the walk. Before the beginning of each test, the respiratory frequency, the cardiac rate measured by frequency meter POLAR -model FS1 and the blood pressure measured by sfigmomanometer Tyco™ and stetoscope Littmann™ were obtained, as well as the effort perception by means of the Borg scale (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). At the end of each test, the same parameters were recorded again.…”

Iron supplementation maintains ventilatory threshold and improves energetic efficiency in iron-deficient nonanemic athletes

“…The highest VO 2 obtained was considered the subject's VO 2 peak. VT was determined using the ventilatory equivalent method (VEQ method), defined as 'that intensity of activity which causes the first rise in the ventilatory equivalent of oxygen (VE/O 2 ) without a concurrent rise in the ventilatory equivalent of carbon dioxide (VE/CO 2 )' (Reinhard et al, 1979;Powers et al, 1984). VT was evaluated independently by both investigators and the final determination was made by consensus.…”