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From Fellrnr.com, Running tips
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* The changes in heart rate between each segment may be quite small.
* In many instances the HR<sub>d</sub> is difficult to identify or completely absent.
* Some studies have observed the when the HR<sub>d</sub> is discernible it can occur well above anaerobic threshold, creating a risk of overtraining[[Overtraining]].
* Other studies have shown a disassociation between HR<sub>d</sub> and the anaerobic threshold.
These concerns and issues make the usefulness of the Conconi test unclear. Personally I would suggest that it is better to either use training paces based on race performance ([[Jack Daniels Running Formula]]), or actually measure blood lactate directly.
