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Abstract
This study explored the associations between dietary protein intake quantity and source and muscle capacity and quality controlling for physical activity and resistance training. Emerging adults (n=122; aged 18-20) were assessed for dietary intake. Muscular strength was determined via an isokinetic knee extensor assessment and muscular power was determined using a leg rig. DXA scans were conducted to estimate lean body mass and lean mass of contracting muscle. Muscle quality was calculated as strength relative to the contracting muscle (Nm/kg) and power relative to the contracting muscle (watts/kg). The results indicated higher dietary intakes of total and animal protein were associated with greater muscle capacity for strength and power. Additionally, higher relative animal protein intake was associated with greater absolute and relative power. Males and females differed in the relationships between protein intake and absolute and relative strength as well as relative animal protein intake and muscular power (all p<.05).