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For example, if you low carb were to exercise for 30 minutes and consume 30 litres of oxygen, you low carb would have expended approximately 150 calories (five calories x 30 litres). Without directly measuring oxygen consumption, it's difficult to establish an accurate estimate of energy expenditure during a workout. A second factor affecting the reliability of calorie counters is low carb the difference between net and gross energy expenditure. Gross energy expenditure refers to the energy cost of exercise plus the metabolic rate. Net energy expenditure refers to just the energy cost of exercise. Calorie counters often display gross energy expenditure - so they don't accurately represent the additional energy that is used during exercise. In fact, during a 45 minute workout, net and gross energy expenditure can differ by almost 30% (Utter et al., 1998). The moral?
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