a specialist in the structure and function of the heart
With the women strapped to tilt tables with their heads angled down at 65 degrees, a cardiologist checked their heart functions as an electrocardiogram recorded information every five minutes.
Women in Space
cardi + logy (suffix meaning "science") + ist (suffix meaning "one who does or makes")
of or pertaining to or involving the heart and blood vessels
"Physical activity, which in this age occurs typically in the form of play, promotes cardiovascular, musculoskeletal and mental health and is associated with academic achievement."
– U.S. News
cardi + vas ("vessel") + culum (suffix forming diminutives) + ar (suffix forming adjectives)