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action potentials alveolar air amount of energy amount of oxygen arterial blood average basal basal metabolic rate bicycle ergometer blood corpuscles body weight breathing calories capillaries carbohydrate carbon dioxide cause cent changes cramps decrease depends developed diastolic diet effect of training efficiency endurance energy cost epinephrine ergometer exercise exertion experiments factors fatigue glycogen heart rate hemoglobin improvement increase intensity investigators Karpovich lactic acid liter of oxygen load lung ventilation maximum measure metabolic rate meters minute minute-volume motor muscle fibers muscular activity muscular contraction nerve normal observed obtained output oxygen consumption oxygen debt oxygen intake patients period physical activities physical education physical fitness Physiol physiological posture pounds pulse rate records reflex respiration respiratory quotient resting pulse rise runners running showed speed stimulated strenuous stroke volume sugar swimming tion tissue treadmill venous blood vital capacity vitamin warming-up weight lifting