Yesterday was the big day; my first ever MAP test! I’d done no cycling on Sunday, and nothing on Monday morning either, so my legs should have recovered from Saturday’s ride. The test was scheduled for 14:30, so I was determined to take things easy, get hydrated and to eat accordingly. The last thing you want on any max. effort test is to feel lunch sitting in your gut!
After driving over to Alex’s house he explained the mechanics of the test. It was to be done on his indoor trainer which is fitted with SRM cranks to measure the power being generated. The general idea was that I would be told to cycle at a particular power output which would increase every minute until I could do no more.
I really had no idea what to expect, or what sort of power output I’d be capable of. I’d made a vague effort to work out how much power bad been required for my Calga TT a few months back and had come up with 153W, so I figured anything over 200W would be good. Alex left me to do a 20 minute warm-up and get used to the SRM readout. It’s surprisingly sensitive, so maintaining a steady power output is very hard for an inexperienced user. I was fluctuating all over the place, often 20W over or under the level I was aiming for. I tried a couple of short efforts and managed to top 300W easily enough, so things were looking up.
Once I’d warmed up thoroughly, Alex decided to start me off at 125W and I’d be required to increase by 25W every minute. 125W is super easy, and I was soon past 200W and heading for 250W without feeling too stressed. I was concentrating on trying to minimise the yo-yoing around the target wattage and dealing with the gearing on the test bike. With only 7 gears there’s a large jump between each one, and when I chose to shift into my final gear around 300W it took ages to engage which was a bit off-putting.
By this time I was breathing hard and I knew the end would be coming up soon, though I desperately wanted to reach 400W. Every minute the pressure piled on and on and I could feel the lactate starting to burn in my quads. For some reason, my right quad was burning more than my left, so I obviously favour it to a large degree. By 375W I was consciously trying to work my left leg harder, reasoning that since it wasn’t burning as much it could clearly do more work, then, finally, I was there: 400W. Having reached that goal, the next target became to finish the full minute at 400, though that proved to be too much to ask. After just short of 30 seconds my power started dropping consistently below 400 and I was cooked. That’s it - show’s over, I could spin the legs over and try to get some breath back.
Alex disappeared to download and analyse the power data and returned shortly afterwards to announce that my mean maximal aerobic power (MAP) is 406W. I was pretty happy with that.
Emil, my boss in Canada, who’s a pretty decent track rider, reckons he’s never managed 400W in any of his MAP tests, but he’s 20kg lighter than me and it’s easier for heavier guys to put out bigger numbers. Anyway, that’s the baseline established and Alex is designing my training plan to take me through to La Marmotte in July. I’ve also got a shiny, rented power meter fitted to my bike for the duration of the plan: another gadget to play with!
Update: here’s the graph of my MAP test. The green line is cadence, so you can see I changed gear twice during the test. The yellow line is power, which, although it oscillates wildly, increases steadily until I can’t hack the pace any more, and you can see the line tailing off on the right-hand side.
