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	VO2 Max (Protokol Bruce)	Nisbah Pertukaran Pernafasan
Bidang	Sains Sukan	Sains Sukan
Keluarga	Hypothesis test	Hypothesis test
Tahun asal	1963	1949
Pengasas	Robert Bruce	J. B. Weir
Jenis	graded maximal exercise test	expired gas analysis
Sumber perintis	Bruce, R. A. (1963). Evaluation of functional capacity and exercise tolerance of cardiac patients. Modern Concepts of Cardiovascular Disease, 32(4), 1-4.	Weir, J. B. (1949). New methods for calculating metabolic rate with special reference to protein metabolism. Journal of Physiology, 109(1-2), 1-9.
Alias	maximal aerobic capacity, aerobic power, cardiorespiratory fitness	RER, respiratory quotient, RQ, substrate oxidation ratio
Berkaitan	5	5
Ringkasan	VO2 max represents the maximum amount of oxygen a person can utilize during intense exercise, measured in millilitres of oxygen per kilogram of body weight per minute (ml/kg/min). Developed by Robert Bruce in 1963, the Bruce Protocol is a graded maximal exercise test on a motorized treadmill that incrementally increases speed and incline until the subject reaches volitional exhaustion. This test is a gold standard in clinical and sports medicine for assessing cardiorespiratory fitness and aerobic capacity.	The respiratory exchange ratio (RER), also called the respiratory quotient (RQ), is the ratio of carbon dioxide produced to oxygen consumed during metabolism. Introduced by J. B. Weir (1949), RER is a non-invasive indirect measure of substrate utilization—indicating whether the body is primarily oxidizing carbohydrate, fat, or protein. RER values range from approximately 0.7 (pure fat oxidation) to 1.0 (pure carbohydrate oxidation) and higher under anaerobic conditions. By measuring exhaled and inhaled gases during exercise, RER reveals which fuel source predominates at different intensities, providing insights into metabolic flexibility and exercise physiology.