Ventilatory threshold

In kinesiology, ventilatory threshold refers to the point during exercise at which ventilation starts to increase at a faster rate than VO2 (V - volume, O2 - oxygen). One’s threshold is said to reflect levels anaerobiosis and lactate accumulation. As the intensity level of the activity being performed increases, breathing becomes faster; more steadily first and then more rapid as the intensity increases. When breathing surpasses normal ventilation rate, one has reached ventilatory threshold. For most people this threshold lies at exercise intensities between 50% and 75% of VO2 max. A major factor effecting one’s ventilatory threshold is their maximal ventilation (amount of air entering and exiting lungs). This is dependent on their personal experience with the activity and how physically fit the person is. Comparison studies of more athletic people have shown that your ventilatory threshold occurs at a higher intensity if you are more active or have been training for that exercise; although, in some cases shorter continuous tests can be used because of rapid alterations in ventilation.

Methods

Sample values

Frangolias DD, Rhodes EC School of Human Kinetics, University of British Columbia, Vancouver, Canada. Medicine and Science in Sports and Exercise [1995, 27(7):1007-1013] :

A government experiment to test ventilatory threshold was held between November and December of 2004. Subjects included 32 physically active males (age: 22.3; TV: 180.5; TM: 75.5 kg; VO2max: 57.1 mL/kg/min) encountered a continuous test of increasing loads on a treadmill, cardiorespiratory and other variables were observed using ECG (recording of the electrical activity of the heart) and gas analyzer. During the test, subjects were asked to point at a scale from 6 to 20 reflecting their feeling of discomfort. The RPE threshold was recorded as constant value of 12-13. Averages of ventilatory and RPE threshold were conveyed by parameters that were monitored and then compared by using t-test for dependent samples. No significant difference was found between mean values of ventilatory and RPE threshold, when they were expressed by parameters such as: speed, load, heart rate, absolute and relative oxygen consumption. The conclusion of this experiment was: the fixed value (12-13) of RPE scale may be used to detect the exercise intensity that corresponds to ventilatory threshold.

VO2 max levels

Maximum oxygen intake, VO₂, is one of the best measures of cardiovascular fitness and maximal aerobic power. Vo₂ max averages around 35- 40 mL/ (kg∙ min) in a healthy male and 27-31 mL/ (kg∙ min) in a healthy female. These scores can improve with training. Factors that affect your VO₂ max is age, sex, fitness, training, and change in attitudes. Cycling, rowing, swimming and running are some of the main sports that push VO₂ levels to the max. Once they have reached their VO₂ max they go into their ventilatory threshold. Once athletes learn their limits, they can then push their thresholds farther and increase performance.

See also

References

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