Ran some 4km on the usual "Vicom Route" before work today. Ran strapped with Nike HRM (Heart Rate Monitor) and TraxC5 plus Sting's Desert Rose streaming into my consciousness via the iPod Nano.
Using the formula, HRmax = 217 − (0.85 * age), mine would be 181.3 (Maximum Heart Rate). Am aware that there are variations to this formula but decided on this one because, well, it is there.
As a beginner (rather old and late beginner) , ran mostly 70% of my HRM and felt comfortable. Last few hundred metres upped the beat to 90% of the HRM and pushed 10% above HRM for the last 200m. It hurts but only for a while and quite surprisingly, I took shorter time to recover. Yay! Am not sure what all these means but may consider taking a stress test to check out the exact HRmax.
More on heart rate here -> http://en.wikipedia.org/wiki/Heart_rate
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