title: Physical activity improves protein utilization in young men.
abstract: Protein utilization in young men under circumstances of one or two periods of work and both adequate and surfeit energy intake was determined by nitrogen balance; protein intake was constant at the FAO/WHO (1973) safe level (0.57 g/kg body-weight). Physical activity affected protein utilization negatively by increasing sweat and faecal N losses, and positively by supporting increased energy intake. Efficiency with which surfeit energy improved N utilization (mg N retained/added kJ) was greater under circumstances of increased activity. Changes in body composition as determined by total body potassium and hydrostatic weighing supported the N retention values.
mesh_terms: D000328:Adult; D001823:Body Composition; D001835:Body Weight; D004044:Dietary Proteins / Q000378:metabolism*; D002149:Energy Intake; D004734:Energy Metabolism; D005243:Feces / Q000032:analysis; D006801:Humans; D008297:Male; D009584:Nitrogen / Q000378:metabolism; D005082:Physical Exertion; D011188:Potassium / Q000032:analysis; D013542:Sweat / Q000378:metabolism
chemical_list: D004044:Dietary Proteins; D009584:Nitrogen; D011188:Potassium