
Originally Posted by
MoneyAddyct
1. Is cardio for only 20-30 minutes really effective in weight loss? I see people on the boards saying you should do cardio for 45 min - 1hr. Do they have it wrong? Or is there an unstated relationship between frequency and duration that those people are operating under (that is, does a greater frequency allow for a shorter duration)?
Yes if you're glycogen depleted, say first thing in the AM, although 30-40mins would be more effective since it takes a given amount of time for your body to release fat into the bloodstream.
2. Why is it then when "thinking" about cardio, one should think in terms of heart rate and percentages of maximum heart rate instead of calories burned? What does achieving a certain heart rate do in terms of fat loss that burning calories does not? (Feel free to point me to an article or something for that one)
If your heart rate raises too high then your body will simply burn muscle glycogen rather than trigger fat to be released and burned as energy. Calories burned can be important as well if you're using cardio to become in a calorie deficient state. Ideal heartrate would be 65-75% of MHR (max heart rate), Formula to figure this out would be 220-age x .65 or .75 = THR (target heart rate)
3. Lastly, and this is perhaps a little unrelating to the above....My arms have always been lagging in proportion to my other muscle groups. Where my chest and shoulders grow steadily and without much difficulty, I have to work VERY hard for every mm that my arms grow. Right now, I seem to be satisfied with their size, however, but would like more definition. Through the process of cardio and fatloss (ie, the process of acquiring definition) will the size/circumference of my arms get smaller at all? Yes as you lose fat you will lose a bit of size overall on your body, but since fat has not shape and muscle does, you should be satisfied with results.. A lot depends on genetics and where you hold your fat/retain water and also how much muscle is underneath the fat once it comes off And, if yes, is that not to say that they couldn't LOOK bigger? It's an illusion, again it depends on many factors. When I diet down my arms normally lose around an inch but they look 10 times better than off season. Varies from person to person.
Thanks again bros!
MoneyAddyct