Mack, P B Study of nitrogen balance and creatine and creatinine excretion during recumbency and ambulation of five young adult human males. [electronic resource] - Aerospace medicine Jul 1973 - 739-46 p. digital Publication Type: Journal Article ISSN: 0001-9402 Subjects--Topical Terms: AdultCalcium IsotopesCreatine--urineCreatinine--urineFeces--analysisHumansImmobilizationMaleMuscle TonusMuscles--physiologyNitrogen--metabolismPhysical ExertionRest