I haven't noticed a large loss of strength (within your 10 % recommendation). (legionathletics.com)
This causes ALS patients to progressively lose muscle mass, resulting in loss of strength in the limbs and problems with speaking, swallowing, and breathing. (sciencedaily.com)
You can couple all of this with loss of strength, loss of sex drive is reported by most, and hormone levels get out of whack by both male and female competitors. (fitoverfat.com)