couple of questions regarding lactate threshold.
1. when RER=1, what does this mean, is this the aerobic threshold, where the body is using purely O2
2. what is the RER at the lactate threshold
3. what are lactate threshold values (%HR,VO2Max) for semi-elite versus elite athletes.
4. what does an RER of 1.21 at the end of exercise indicate
5. What are high post-exercise RER >1.5 values from.
6. is anyone familiar with the bruce protocol? if so, how accurate is it.
Thanks
1. RER- Respiratory Exchange Ratio VCO2/VO2. .7 is pure fat metabolism, 1.0 is pure carb metabolism, neglecting protein contributions to energy.
2. Lactate and anaerobic thresholds are very difficult to describe, but RER= 1.0 is considered anaerobic threshold in steady state exercise.
3. Lactate threshold is from about .5-.9 of VO2MAX. The values for HR are similar.
4. a RER of 1.21, simple answer is hydrogen ions were being buffered with bicarbonate and blown off as CO2.
5. High RER is from hyperventilation probably, and the hydrogen buffering.
6. What do you mean by accurate? If all gas exchange equipment is hooked up to you it is accurate, but there is the possibility that the legs would be fatigued during the long test, which could prevent maximum VO2 values from being reached.
You should also be able to find the Ventilatory Threshold in any standard Vo2max test. The ventilatory and lactate threshold have an extremely high correlation. This is likely a closer estimate of lactate threshold than RER. Or at least you'll have a couple different measurments, RER=1 and Ventilatory Threshold.
http://nsca.allenpress.com/nscaonline/?request=get-document&doi=10.1519%2F1533-4287
(1999)013%3C0067:COLAVT%3E2.0.CO%3B2
Read the enormous lactate threshold thread at the top of page 1. Many of your answers are there.
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