Lactate threshold predicting time-trial performance: impact of heat and acclimation
Why the study?
Does blood-based or ventilation-based lactate threshold testing better predict time-trial performance in cyclists under varying environmental conditions?
Population
20 subjects (12 cyclists undergoing heat acclimation and 8 control subjects)
Comparison
Lactate threshold test, maximal O2 uptake test… vs Control subjects completing the same tests…
Design
Other
Follow-up
10 days
Authors
Discussion
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Member takes
Implication
Should not yet change lactate threshold testing in practice; Level 5 evidence leaves prospective validation open.
Structured PICO
Does blood-based or ventilation-based lactate threshold testing better predict time-trial performance in cyclists under varying environmental conditions?
P
Population
20 subjects (12 cyclists undergoing heat acclimation and 8 control subjects)
I
Intervention
Lactate threshold test, maximal O2 uptake test, and 1-h time trial in hot (38°C) and cool (13°C) conditions, before and after 10 days of heat acclimation
C
Comparator
Control subjects completing the same tests before and after 10 days of identical exercise in a cool environment
O
Outcome
Correlation and bias between six lactate threshold methods (blood- and ventilation-based) and mean power during a 1-h time trialsurrogate
Blood-based lactate threshold methods are superior to ventilation-based methods for predicting cycling time-trial performance across different temperatures and acclimation states.
Cite This Study
Lorenzo et al. (2011) studied this question.