Author: ianbarrington

I appear to have opened a bit of a can of worms with my Performance Manager (PM) graph. So, for those of you (Guy in particular) who want some more info, here’s an explanation of each of the graph elements and what they signify.

The PM attempts to provide you with an indication of Form by looking at the cumulative effects of your training stress (TSS). Form (according to Andy Coggan) can be regarded as Fitness + Freshness. You need both to perform at your best. Here’s how the elements of the PM help define your Form:

ATL – Acute Training Load represents your current degree of freshness, being an exponentially weighted average of your training over a period of 5-10 days. This period is referred to as a time constant (TC). The formula for ATL looks like this:

Where = yesterdays ATL, = current Training Stress Score and = your ATL Time Constant

CTL – Chronic Training Load represents your current degree of fitness as an exponentially weighted average of you training over a 42 day period. Building your CTL is a bit like putting money in your savings account. If you don’t put much in you won’t be able to draw much out at a later date. The formula for CTL looks like this:

Where = yesterdays CTL, = current Training Stress Score and = your CTL Time Constant

TSB – Training Stress Balance. This is simply the difference between your CTL and ATL, and represents your form.

A negative TSB is indicative of a high training load, i.e. high ATL relative to CTL, such as would occur in a high load training week. Alternatively, a period of taper leading up to an event should correspond with an increasing TSB where ATL is reduced relative to the current CTL.

Where TSB is positive, there is a strong indication of good performance following a consistent period of training. To help me define instances of good performance, the black line on the graph shows my ten best 20 minute mean maximal power efforts. My best three correspond to a decreased ATL following a rest week, where TSB is recovering from -20 to +5. For the time being, as I’m still in a base/build phase, I’m looking to steadily increase my CTL in preparation for TransScotland and especially Mountain Mayhem.

More (and better) articles on this subject are available from the Cyclingpeaks website. The formulas for ATL and CTL are adapted from the LW Coaching website.

Edit (15/03/07): I’ve discovered to my suprise (and horror) that a search in Google for the the above terms brings you here before places like the Cyclingpeaks website. This short article doesn’t attempt to take anything away from the guys that designed all these clever fitness metrics, so if you’ve come to this page without having visiting Cyclingpeaks then click here. The text above gives my (abridged) interpretation to the system, and there’s no substitute for hearing it from the horses mouth 😉

Cyclingpeaks is a pretty cool piece of software. I’ve been using it to track my training progress since last November, and its taken until now for me to know where to look to see the trends in my data. Of all the graphs that show you what you’ve done, the most difficult to comprehend is the performance manager chart.

But now that I understand what I’m looking at, its certainly one of the most useful. This last week has seen me out a lot on the bike – I’ve turned out one of best Zone 3 watts/HR and hit my third best 20 minute mean maximal power this season. I was quite pleased, but by the weekend I had to admit that I was pretty tired. When I looked at the Performance Manager chart, I saw that my Chronic Training Load had gone up 13 points in the last 8 days, a 23% increase. So I don’t overcook things and get ill, I need to back off slightly to regain a bit of freshness and then look to build my CTL further through March before I start my speed work.

I’ve been inspired somewhat by the website of Dave Harris, another 24hr soloist from the US. Having just come back from injury, he finished 2nd behind Tinker at the Old Pueblo 24hr race. Besides having a wealth of really useful info on 24hr racing on his site, he’ll “be building CTL steadily until mid-spring when I’m back to the 120-140 levels where I prefer to be for ultra racing”. To some people its just numbers, but now that I’ve got my head around the PM chart, I reckon it’s pretty impressive.

Learning to ride a bike of one of those things that defines your childhood. I was very proud of the fact that I taught myself to ride, and I did it without stabilisers – a bold move at the age of 7 I thought. By freewheeling my Raleigh Tomahawk down the garden path, I measured my progress in slabs. When I’d run out of slabs (which incidentally ended at the top of a short flight of steps), I ventured out onto the road in the front of the house. As I wobbled off down the road I realised that I’d done it – I’d learnt to ride a bike.

You’d think that a set of training rollers would be straight forward enough to ride wouldn’t you?

With one hand on the bench and the other trying to control the handlebars as the bike swerved around uncontrollably beneath me, I quickly discovered there was more to it than meets the eye. After a couple of false starts, and with a little assistance from Beth I gradually got myself upright, but still with one hand firmly on the bench. Gradually as I increased my cadence I steadied myself with just my fingers until, finally, and with concentration strong enough to bend spoons, I let go of the bench, wobbled a bit and I was away. I felt 7 again – I’d learnt to ride rollers 🙂

A big part of 24 hour racing is mental strength and your capacity to tolerate the discomfort and pain that comes from riding a bike for such a long duration. Before I’d done my first 24 hour solo, a friend and soloist said to me:

“If you can do the first 20 hours you’ll be OK – it’s the last 4 hours that really hurts”

I remember being unable to comprehend what I would feel like after just 12 hours, never mind 20. But I discovered that its not so much how much your body hurts, it’s how much you think it hurts. If you can motivate yourself to stay focused on the riding you find that your body will only hurt so much.

Motivation is the key to a lot of things I guess, and maintaining it can be tricky. Last week is probably a good example with things like work, the weather, darkness and my bike all conspiring against me to some extent. But the reality is most of it could have been overcome with a little motivation. It was a bit like being in the pits at a 24hr race – you know you should be out on on the course riding your bike, because if you aren’t then you’re not making any progress.

The sun appeared as a pale disc through the fog this morning. While the rest of the country was bathed in sunshine (according to the weatherman), it looked like I was going have to wait a little while before I saw any of it. My enthusiasm to get out on the bike was growing faster than the fog was clearing, so at 10.30am, I went out anyway. Trying to dress for a ride that was going to involve freezing fog and most likely brilliant sunshine later on was a bit tricky, but a combination of thick gloves, buff, windproof jacket, neoprene overshoes and ¾ length leggings seemed to work OK, even if it looked a little odd.

Once I’d finally escaped from the valley bottom, leaving behind the bitterly cold fog, I found myself beneath acres of blue sky criss-crossed with vapour trails, and not a cloud to be seen. Its been the best day we’ve had for the last two months by far, and while this winter seems to have been a struggle to get the miles down, today I felt like I could ride all day.

For the first time this training season, I completed a 5 hour road ride. With over 2000m of climbing, and 80 miles, I found form today that had previously evaded me this winter. The sun on my back gave me the strength to stay out for that extra hour, just so I could enjoy it a bit longer.