Why Measure Power
I have been interested in monitoring performance metrics for a long time. That’s why I started HeartRateMonitor.co.uk in 1999 since rebranded to CardioCritic.com. Measuring your speed/pace, distance. time and heart rate are all very useful metrics. They can be used to monitor progression with regard to competitive status, fitness level and recovery state. However, with all these metrics, there are external factors that can affect and influence the results. e.g wind, elevation, altitude, personal well-being etc.
Power is Absolute
That’s where POWER is different. Power is an absolute measurement that is the same whether you’re riding uphill, downhill, in to a headwind or pushed along by a tailwind. It is not affected by your physical well-being. 200 Watts is 200 Watts which is why POWER is a brilliant metric for monitoring progression ….
Monitor Progression & Improvement
Monitoring your power output is a quantitative and repeatable way to measure how hard you are training. Power can be the benchmark figure that all other metrics are measured against. Cycling the same route at a given average power is a convenient way of monitoring progression. If the average power from successive rides is similar (+/- a few watts) and your average heart rate is dropping … you are getting fitter, irrespective of the finishing time (which can be affected by weather etc). Your body is producing the same levels of power with less effort on your cardiovascular system – conclusion being an increase in fitness levels and cycling efficiency.