ventilatory threshold

ven·til·a·to·ry thresh·old

(ven'til-ă-tōr-ē thresh'ōld)
Point during exercise training at which pulmonary ventilation becomes disproportionately high with respect to oxygen consumption; believed to reflect onset of anaerobiosis and lactate accumulation.

metabolic and related thresholds

intensities of exercise (expressed as power output or as percentages of aerobic capacity, O2 max) at which specific metabolic and related changes are considered to take place. A plethora of thresholds has been proposed historically. These included many giving the same label to different criteria, or different labels to the same criterion; a number also embodied assumptions about bodily processes, at best unproven and sometimes now known to be false. The table lists six which appear unambiguous, the first five exactly as first described and the sixth slightly modified; however the two that are not related to observable phenomena (anaerobic and aerobic thresholds) are not recommended for further use. The [Lac]b (blood lactate concentration) values cited are representative approximations for a healthy but untrained young adult; they are used in some laboratories as working indices, but should not be taken as definitions of the term concerned. Other usages in the literature include: (1) OBLA as equivalent to LT or AT - confusions possible only if the reference to continuous rise is omitted from the OBLA definition; (2) the 4 mmol.L- criterion being designated as any one of 'anaerobic', 'aerobic' or 'aerobic/anaerobic' thresholds. See table overleaf .
References in periodicals archive ?
Iron supplementation maintains ventilatory threshold and improves energetic efficiency in iron-deficient non-anaemic athletes.
Ventilatory threshold (Vt) was determined using the criteria of an increase in the ventilatory equivalent for oxygen (VE V[O.
University of New Hampshire associate professor of kinesiology Timothy Quinn and his former graduate student Benjamin Coons set out to learn just how good this test, gaining in popularity over the past decade, is, and how it compared to two other laboratory-tested measures of intensity, the lactate threshold and the ventilatory threshold.
A study by Ahmaidi et al (31) investigating the effects of interval training on ventilatory threshold and cardiorespiratory responses in elderly healthy individuals showed significant improvement of both maximal aerobic capacity and submaximal exercise tolerance, with a significant decrease in heart rate after a 3-month program.
Peak oxygen intake increased significantly in the TCC group after training and at the ventilatory threshold, there was a significant increase in heart rate, VO2, pulse and ventilation.
This upper-limb interval-training program was adapted from the Square Wave Endurance Exercise Test (SWEET), which is specific and individualized at the ventilatory threshold [3,7,12].
More recent research has demonstrated that exercise prescription should be based on percent of ventilatory threshold (Bixby et al.
BMD increased at intensities above 110% of ventilatory threshold and decreased at intensities below 110%.
Holland LJ, Bhambhani YN, Ferrara MS, Steadward RD: Reliability of the maximal aerobic power and ventilatory threshold in adults with cerebral palsy.
The July, 2010 issue of Road Bike Action magazine featured results from cyclists who participated in a three-month ASEA trial, which resulted in an average of 10% more ventilatory threshold endurance, with some cyclists experiencing an increase of more than 30%.
This approach suggests that ventilatory threshold (VT) can be identified by an increase in breathing frequency and that respiratory compensation threshold (RCT) can be identified by a large increase in the perceived sound intensity.
2011) Validity of the modified conconi test for determining ventilatory threshold during on-water rowing.