Table 3.

The number of keywords and the top five in the world.

Year	The number of keywords	The top five
2001	280	Aging, sarcopenia, skeletal-muscle, young, physical- activity
2004	553	Sarcopenia, aging, skeletal-muscle, exercise, body-composition
2008	1,081	Sarcopenia, aging, skeletal-muscle, body composition, strength
2012	1,712	Sarcopenia, aging, skeletal-muscle, strength, body-composition,
2016	3,650	Sarcopenia, body-composition, skeletal-muscle, mortality, older-adults
2020	7,057	Sarcopenia, mortality, prevalence, skeletal-muscle, body-composition