Talbot's Rule

26/4/2020

The elevation profile of the Malvern Hills Trail Race

During the Covid-19 pandemic virtual running races have become popular. Such races give participants the opportunity to plan and run their own course from their home, running a set horizontal distance (for example 10km). As such each participant would be running a different route with varying amounts of height gain, over the same horizontal distance, whilst adhering to the social distancing guidelines.

In April 2020 Dave Talbot, an adventure specialist from Bristol, devised a simple method to help calculate fair results so that they reflected each respective height gain by subtracting 1 minute for every 25m of height gain. On a bigger scale: subtract 4 minutes for every 100m of height gain.

Dave shared his initial tests with myself, I then derived this formula based on Dave's initial predictions and testing:

TT = CT - (2.4 x HG) / 60

where:

TT = Talbot Time (minutes)
CT = Clock Time (minutes)
HG = Height Gain (metres)

As in walking (Naismith's Rule) there are variables such as terrain and amount of kit carried.

We are now testing this formula on a number of virtual races during the Covid-19 pandemic, initially we are looking at distances of 10km to 21.1km. These virtual races provide focus, motivation and fun to runners all over the world.

22 Comments

Maeve

30/8/2020 11:38:16

Hi, both myself and husband completed half mara yesterday to take part in virtual Cadair. We happened to do it on a munro here in Scot so ascent was fairly descent! We had a good look at Talbot rule last night and can’t for the life of us figure out why we bothered with ascent at all - 1min/25m reduction could never bring your time near a flat course. Eg hubby did 21.1km in 3:27 with ascent of 951m, with Talbot rule he got 38 min reduction which left final time of 2:49 - he’s ran flat half’s in 1:40. Are we missing something? Perhaps 1min every m below 500m and bigger bonus for higher elevation? ??

We’re loving your virtual races this year and want to thank you for your efforts, above are just thoughts from munro weary peeps not fit for anything else!

Can’t wait to get back to Cadair next year - keep up the great work :)
Maeve

Mike

30/11/2020 16:54:33

Hi Maeve,

Thanks for taking part.

If you take the winner of Cadair X 2019 (2hr 11min, height gain 1150m ish). This gives a Talbot Time of 1hr 25min. Given Cadair X is actually closer to 14 miles than 13 miles(!) it's not beyond the realms of possibility for a tactical application of Talbot's Rule to favour height gain... but it is very hard to achieve!

Dave has also been holding similar events and at his most recent virtual 10K the person with the most height gain won, so it is possible! Results here

https://docs.google.com/spreadsheets/d/1zK0yvEm9-tLYRZIPKnoDARMa5B7HtZW6U6vLLfafrzA/edit#gid=0

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