The world population is aging rapidly. This growth of the aging population is accompanied by an increased number of frail elderly people who are at risk of adverse health outcomes such as disability, co-morbidity and mortality.
Sarcopenia, the age related loss of muscle mass, strength and performance, is an important feature of frailty. To prevent or treat sarcopenia, resistance-type exercise training and dietary protein intake might be important. In the present thesis, we show that dietary protein intake in frail elderly people was especially low at breakfast and lunch. Increasing protein intake at breakfast and lunch for 24 weeks did not increase muscle mass but improved physical performance in frail elderly people. Resistance-type exercise training improved muscle strength and physical performance after 24 weeks, but dietary protein supplementation was required to augment muscle mass in frail elderly people.