Fasting and Metabolism

November 17, 2009

Made a few short comments in response to a blog post I just saw on The Fitness Spotlight. The post is here and below are my responses to some of the claims made.
—
Just a few short comments on some claims here. Sorry if this has been covered somewhere among the comments, I haven’t read through them all.
“Liver glycogen levels are depleted within 8-10 hours. Muscle glycogen falls by 50% over 24-hours, even without exercise. “
False on both accounts. Liver glycogen is completely depleted in approx 28 hrs (Cahill et al). And the second statement is also incorrect. In humans, muscle glycogen is barely affected at all after 24 hrs, assuming no strenous activity.
“After depleting glycogen, amino acids are recycled to be broken down for glycogen through gluconeogenesis. “
This is an ongoing process, but liver glycogen does not need to be depleted in order for amino acids to contribute to the […]

Original post by noreply@blogger.com (Martin Berkhan)

Be Nice and Share!

Filed under: Uncategorized

Warrior Fit Testimonials

First, I want to say thank you for convincing me to do Tabata! I was struggling to lose weight and Finally I found something that helped! I really appreciate your coaching! - Craig T.

Ever since I was convinced to do Tabata I have seen huge results, I lost 6 pounds and gained energy in the first 3 weeks. I have been working out for 3 months before I decided to do Tabata and I struggled to lose weight. At first I thought "How am I losing weight by bringing my heart rate up then cooling down then bringing it up again?" I don’t know how it works but it does! Thank you!! - Theresa F.

The first day of Tabata, I wondered WHAT AM I DOING - I AM 56 !! Five weeks later I knew that it was what I needed. I learned that I could push myself well beyond my comfort zone and feel good later. I have a marked improvement in physical as well as emotional endurance. - Lyn C.

When I was first told about Tabata I was very excited from the word go, however that excitement stemmed from the fact that I had no clue what it meant. I missed the first week of class b/c I was traveling for work so when I came in during the 2nd week I had some making it up to do. It was hard at first b/c my body wasn't used to working out at such a fast pace, but once I got into a rhythm I started to feel very good. These classes are no joke. If you stick with it you will leave there feeling stronger, healthier and overall better about yourself and what you've accomplished. I would recommend these classes to anyone. Darrin is a great trainer and he'll keep you going with his energy. - Jami L.