To give blood you must: 1  Be in general good health.  Be at least 17 years old. (If you are 16 you can donate with a CBC consent form signed by your parent). There is no upper age limit as long as you have no health restrictions.
Specific radiative intensity. Specific (radiative) intensity is a quantity used in physics that describes electromagnetic radiation. It is a term used in much of the older scientific literature. The present-day SI term is spectral radiance, which can be expressed in base SI units as W mâ2 srâ1 Hzâ1.
The Advisory Committee concluded that absolute moderate-intensity or vigorous-intensity physical activity is necessary for substantial health benefits, and it defined absolute aerobic intensity in terms of METs: 1  Light-intensity activities are defined as 1.1 MET to 2.9 METs.he intent of the aerobic Guidelines for adults is to ensure that people who follow them generally achieve 500 to 1,000 MET-minutes or more. For this to occur, the definition of intensity in the Guidelines needs to be in terms of METs (i.e., absolute intensity).