I've been reading old copies of Runner's World Magazine and the October 2012 edition described the anaerobic threshold (AT). Apparently this is the point at which the body produces lactic acid faster than it can be removed; ideally the AT should occur as close to the maximum heartrate as possible.
"The average human will have an AT located at roughly 55-60 per cent of their maximum heartrate. Elite athletes will reach as high as 85-90 percent".
Across all my training runs my average heartrate has been 90% of theoretical maximum: the Watford Half Marathon was run at 92% of max; last summer I ran 5 miles at an average 99% of max. The possibility that there is any measure which defines me as "elite" amuses me - and I'm in need of smiles at the moment!
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