Reddit reviews Exercise Physiology: Nutrition, Energy, and Human Performance (Point (Lippincott Williams & Wilkins))
We found 3 Reddit comments about Exercise Physiology: Nutrition, Energy, and Human Performance (Point (Lippincott Williams & Wilkins)). Here are the top ones, ranked by their Reddit score.
Used Book in Good Condition
220-Age is a gross estimation of Heart Rate max (HRmax). It is used in a sense that BMI is used to quickly evaluates body composition. I think there is a disconnection between HRmax and Exercise Intentisty that needs to be made. HRmax % is only a part of the equation of VO2 (volume of oxygen consumption in the human body). HRmax is used in exercise prescription because, without laboratory equipment you can't measure the other parts of VO2. Is HRmax the true absolute beats per minute a heart can achieve? Most likely no, but prolonged activity at the rate will lead to MVO2 (heart oxygen consumption) not being able to keep up with demand (ischemia).
The second part and edit of your question has to deal with what your targeting to exercise. Exercise intensity can come from volume, time, mode, and strain of activity (aka intensity). I would argue if you can go for 30mins at 90% of HRmax that is not your true maximum. Your ie. training question deals with which energy system you want to target.
A more accurate measure in calculating your HRmax/VO2max would be a Bruce Protocol along with a measure of HR and blood pressure at each stage.
Paraphrased Sources:
Therapeutic Exercise: Moving Towards Function
Exercise Physiology: Nutrition, Energy, and Human Performance
Cardiovascular and Pulmonary Physical Therapy: Evidence to Practice
Essentials of Strength Training and Conditioning - 3rd Edition
This is the textbook I read it in... http://www.amazon.com/Exercise-Physiology-Nutrition-Performance-Lippincott/dp/0781797810
Unfortunately I sold it back after I completed the class. I've wished multiple times that I hadn't, because it was a great textbook. I'll look around and try to find a source, though.
All TDEE/BMR calculators are just an estimate. In the case of Katch-McArdle it's a more conservative estimate - it will almost always err on the side of a lower figure.
I'd be interested in Katch and McArdle's explanation of the formula but I don't own nor have I read their 1,104 page book. And honestly, I'm not sure how well I'd be able to follow it.