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Aug 17, 2018 - 04:28 AM  

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  • Moderated by:
  • eblues
Pete Riegel's Prediction Formula
  • Posted: 20.02.2006, 05:22
     November 2004
    last visit:
    Pete's Formula: T2=T1*(D2/D1)^1.06

    Sheer simplicity. There are quite a few websites that use this formula to present online race time predictors. The final exponential element is the key. I've seen some references to this as basically a percentage of slow down (i.e. 1.06 = 6% slow down). However, the value is acutally derived from the slope of a trend line drawn though plots of velocity at different distances.

    One unique and interesting aspect of Riegel's formula is it's adaptability. One can plot world record times, projected times from any of the other popular prediction tables, or even plot a trend of their own personal times. These custom trend plots result in a "best match" exponent that very closely models the input data. Anyone interested in seeing a few trend charts first hand, and/or running a trend on your own times can download the RiegelPredictor.xls Excel 2002 workbook available in the Downloads section.

    I recently encorporated Pete's formula into RunPro, breathing new life and credibility into a 20 year old program. The flexibllity of the formula allowed me to closely approximate 4 different coaches' training guidelines. RunPro also allows users to set a custom value for Riegel's exponent (referred to by that program as Rx). So if you run a trend on your times using the RiegelPredictor.xls file I mention above, you can set the value you obtain in RunPro, giving you your very own personalized racing and training calculator. (Actually, the RiegelPredictor.xls workbook has a built in racing/training calculator worksheet as well).

    Riegel's formula does best with distances between 5k and marathon. It deviates from other models at shorter distances. I've added a fudge factor in RunPro to compensate for this, so if you happen to compare RunPro to other predictors based on the Riegel formula, the numbers won't match up for distances below 5k.

  • Posted: 25.01.2012, 01:53
     January 2012
    last visit:
    The race time predictions are estimates of what a runner might achieve, if they train appropriately for the distance. It does not mean, for example, that if you train for a 5km and achieve a good time, then you will automatically achieve the corresponding time at the marathon distance.
  • Posted: 11.06.2012, 20:01
     June 2012
    last visit:
    Reading and learning both targets meet more
  • Posted: 10.04.2017, 07:05
     April 2017
    last visit:
    Insanity like this sounds for research writers , which the best strategy was made this year after work, exchange and encouragement.

    edited by: ronaldthomas, Apr 10, 2017 - 07:07 AM



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What is your favorite interval(speed) session?

  • Short repeats - 30s-2min, with a break/jog between
  • Long repeats - 3-10min, with a break/jog between
  • Pyramid - start short, build long end short
  • Staircase - either short to long or long to short
  • Fartlek - I vary times I run fast on how I feel
  • Intervals!? - running fast is for races
  • What are intervals?
  • I have trouble running much less going fast!
  • Other type of speed session

[ Results | Polls ]

Votes: 47


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