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Originally Posted by thestudbeast  It's true but cardio at first raises test (if your not doing it before) but as you do it reguarly it lowers it. I think the intensity will play a big factor as our body's are designed for sustained walking not running (think hunter gatherer). What I never saw is why though. Running also releases cortisol so it's a double whamy. Finnaly and I'm sure you know this running uses glycogen not fat as it's fuel source so why bother with it, just educate them if they want to do it for fat loss. If they want to do it for endurance your stuffed as that is the one thing running is good for.......... preparing you to run. |
Unless your striving to maintain quite a lot of muscle mass then running would burn more total kcals of which more total kcals would come from fat, though I would consider that running is high impact and mixing with other modes of exercise would be beneficial too. Also, BMR would stay elevated for longer after the higher intensity exercise.
Lower intensities would use a greater % of fat kcals over glycogen though burn fewer total fat kcals. Imo walking only has benefits only for i) the lesser trained individual ii) the dieting BBer low on carbs and maybe also using thyroid meds and GH which shift the fuel focus more heavily towards fat.
The main disadvantage for our man here is that he will use a little protein as fuel during the two runs (cortisol is released triggering gluconeogenisis). This is likely to come from muscle tissue.