Background
As humans age, there is a measurable loss of muscle mass that occurs. Termed sarcopenia, this condition not only results in a loss of muscle mass, but also results in a loss of muscular strength and endurance (Bales, 2002). Research has shown that resistance training decreases this loss of muscle mass and muscular strength (Doherty, 2003). However, in older populations, little evidence exists in regards to the addition of whey or casein protein and the effects of each when combined with resistance training. Therefore, the purpose of this study was to examine the effects of whey versus casein protein supplementationcombined with resistance training on muscular strength, muscular endurance and body composition in older females.