Optimal fat burning for a cardio day
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I am transitioning into a new workout plan starting June 1st and am thinking about how to best organize a cardio day for maximum fat burning.
It has been common knowledge for people to do a cardio workout first in the morning, in a fasted state, such that stored glycogen will be depleted and there is no in transit carbs or fat to use for energy. There have been many published studies on the approach. The principle is that muscles will use stored fat instead of stored glycogen for energy. In theory I believe this to be true, but pragmatically do not have the time to exercise in the morning because of earlier shift work.
Would the following approach produce similar results (any time of the day, but 2-3 hours after last meal): 20-30 minutes of high intensity resistance cardio (e.g body weight exercises in HIIT or Tabata protocol) followed by 20-40 minutes of steady state medium intensity cardio (HR is in fat burn zone).
The principle behind this approach is that the glycogen stores are depleted in the 1st high intensity segment. The resistance cardio should be done close to failure during each HIIT or Tabata interval within this segment. The second steady state cardio segment purely burns fat because stored glycogen has been depleted during the first segment and there will not be any in transit food as it will have been 2-3 hours since last meal.
Assume a 3-2-2 split where there are 3 lifting days, 2 cardio days and 2 rest days in a week.
Monday: lift / med intensity cardio
Tuesday: high intensity resistance cardio / med intensity cardio
Wednesday: lift / med intensity cardio
Thursday : yoga /stretching
Friday: lift / med intensity cardio
Saturday: high intensity resistance cardio / med intensity cardio
Sunday: rest
A lifting day will have 20-30 min cardio following isolated lifting segment
This is a theory of mine I have been playing around with and am wondering what others think.