The Hounsfield unit (HU) scale is a linear transformation of the original linear attenuation coefficient measurement into one in which the radiodensity of distilled water at standard pressure and temperature (STP) is defined as zero Hounsfield units (HU), while the radiodensity of air at STP is defined as -1000 HU.he Hounsfield scale /ËhaÊnzËfiËld/ or CT numbers, named after Sir Godfrey Newbold Hounsfield, is a quantitative scale for describing radiodensity.
Redefine Cardio â Make traditional strength training your bread and butter and end with cardio. Close out a 40-minute workout session with 5 to 10 minutes of post-workout anaerobic conditioning. For example, consider 30-second sprints on the bike followed by a minute of rest. Repeat three times and youâre done.
The guidelines published by the American College of Sports Medicine suggest 30 minutes of moderate intensity exercise 5 days a week, or vigorous cardio 20 minutes a day, 3 days a week. 1  For weight loss, you might need even more (up to 60-90 minutes) depending on your diet and other activities. It's tough keeping all these rules straight but, the good news is that you don't have to. Sometimes it's best to forget the rules and get back to basics: Cardio isn't just for weight loss.