Thread by @Gareth_Sandford

Great question.

When to use Anaerobic Speed Reserve (ASR), Critical speed (CS) or both?

I’ll tackle this from 2 aspects:

• Training model selection

• Performance estimation

A thread ⬇️

https://twitter.com/SeanSeale/status/1427576828366053382

Some sports require athlete strengths along the full speed/power duration relationship (middle distance)

Both CS and ASR model stimulus apply

See training zone example⬇️

https://twitter.com/Gareth_Sandford/status/1400538667085488129?s=20

Other sports (e.g teams) have more focus on the top part of the speed-duration curve

ASR model stimulus applies more regularly

https://twitter.com/Gareth_Sandford/status/1387483909303144451?s=20

Long distance events have more focus on stimulus at

• Critical Speed (or threshold stimulus zone)

• Speeds lower than this pace

https://twitter.com/Gareth_Sandford/status/1384240860380819459?s=20

Importantly!

Focus on one end does not mean absence of the other

Just like a slider:

• Move the dial, but remember the range

Example:

Podium demands in Men’s Olympic 10km:

• ~12:50 shape

• ~2:25 last km

• ~52s last 400m

A 5 zone model⬇️(only) that does not use ASR

Is likely to limit meeting the 10km podium demand

https://twitter.com/Gareth_Sandford/status/1369741053138399232?s=20

For performances below CS (e.g marathon or slower),

There are other models better suited to performance estimation and exercise prescription⬇️

https://twitter.com/Gareth_Sandford/status/1278001375872335873?s=20

ASR/APR – strongest estimation for 1–5-min events

https://twitter.com/Dr_Weyand/status/1277942238325223425?s=20

ASR/APR model important for HIIT prescription in the context of workloads beyond MAS…

but that’s a story for another day!

https://twitter.com/mart1buch/status/1428088451270860802?s=20

If you enjoyed the content in this thread, here is the first tweet so you can share with others 👇

https://twitter.com/Gareth_Sandford/status/1430244514258558979?s=20