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(1lb) of fat. This might come as a running and weight loss surprise to those of you using the calorie counters on exercise machines to monitor energy expenditure during a workout. Unfortunately, these digital readouts are not always accurate. The most reliable way to assess energy expenditure during exercise is to measure oxygen consumption. Each litre of oxygen that you consume generates approximately five calories of energy. For example, if you were to exercise for 30 running and weight loss minutes and consume 30 litres of oxygen, running and weight loss you 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 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.
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