Hypertrophy means the enlargement or growth of a specific part of the body, usually caused by an increase in the size of individual cells. Full definition
If you're training for hypertrophy for size you could measure to see if your muscles are getting bigger with a tape measure, visual reference or even your own bodyweight. (fitnesscrest.com)
If you want to trigger the process of hypertrophy in our muscle tissue, we need to incorporate mechanical stress to those muscles, i.e. training. (fitnessandpower.com)
Makanae Y, Kawada S, Sasaki K, Nakazato K, Ishii N. Vitamin C administration attenuates overload - induced skeletal muscle hypertrophy in rats. (strengthsensei.com)