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Bat Jj

Could it be the lack of carbs? Personally, when I was training with low carbs, I never could match my climb times on my benchmark climb, despite being significantly (~10kg) lighter.




Joe, you recently posted about changing your diet to a lower-carb diet. Do you think that could have negatively impacted your performance this season (or been a contributing factor?)

Joe Friel

Erin--Thanks for your comment. Everything is openn to scrutiny. However, I made the dietary change in October 2012 and in March 2013 my FTP was where it normally is in the spring--within 10w of where it usually comes to rest by season's end.

Joe Friel

Bat--Anything is possible.But I made the dietary change in Oct 2012 and by March 2013 my power is where it normally is--within 10w of the usual season high of the past several year. Thanks for your comment.

Stuart Lynne

I'm finding as I get close to 60 that I can still get to the same FTP every year IFF I put the time in. But that it seems to get harder to put the time in and recover as you get older. More painful legs and aching back problems etc. Harder to do the hard training blocks.


The low carb diet has caught up to you and probably cannibalized some muscle which is why you are feeling weaker. That seems too big a loss in too short of a time to blame it on age alone.

Joe Friel

Ferde357-Everything is open to scrutiny. However, I made the dietary change in October 2012 and in March 2013 my FTP was where it normally is in the spring--within 10w of where it usually comes to rest by season's end.

Nicola Di Nisio

to answer the question from Ferde357, I guess you could refer to the muscle mass trend as reported by your impedentiometric scale. If you take away a couple of Kg of glycogen+water, you should be at least in line with the muscle mass you had before the switch (this is my experience at least).

Anyway, muscle mass does not account for everything, during my Keto-adaptation period (I am in the middle of it, having started in mid Aug), I am loosing about 15% of power, in the face of unchanged muscle mass.
No loss on basic endurance though. Probably I can fix it with some supplementation of SuperStarch while my liver and kidneys catch up with the new Gluconeogenesis rate required to sustain sub-threshold workouts. Time will tell.

I am not sure you can refer to your levels in March 2013, some dietary-related changes in your body, might have taken a longer time to happen.

Martin Zetterström

Interesting to understand how much we slow down with age. The graphs are a bit difficult to read, but in the text you say that performance declined with 3-4% per year between 50-85, but at a greater rate after 75. 3-4% per year sounds like a lot, or do you mean 3-4% per 5-year age bracket?

By the way, just the other day (actually before reading this post) I looked up the Swedish National Records for both 100m and 10,000m (running) for different age categories and they both(!) slowed with on average 3,7% per 5 year age bracket up to 70 years old, where the "slowing down" accelerated somewhat.



I use InsideTracker now to track my critical serum values such as hemoglobin, ferritin, and 18 others. Since you have so many other data values about yourself, longterm, I wonder if this additional information could shed any light on your questions about ageing and athletic performance. Fascinating post.

Joe Friel

Hi Mdrangsholt--Good point. Thanks. In Italy for 2 months on vacation, however, so it isn't going to happen any time soon. Should check that when back home in November.

Willem Martins

Joe, I had to do a bit of research to confirm the data in your graphs and they are accurate provided we consider record times.

The fact that a 60 year old can still do a 40km road time trial in the early 50 minutes, means there is still hope for us. :-)

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