In a parallel group design , @ men ( @ @ y ) completed unilateral knee-extensor resistance exercise before the ingestion of @ g whey protein ( W@ ) ( @ g leucine ) , @ g whey protein ( W@ ) ( @ g leucine ) , @ g whey protein supplemented with leucine to @ g total leucine ( W@ + Low-Leu ) , @ g whey protein supplemented with leucine to @ g total leucine ( W@ + High-Leu ) , or @ g whey protein supplemented with leucine , isoleucine , and valine to @ g total leucine .