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Biomedical Sciences - Human Physiology | Energy Balance in Motion

Energy Balance in Motion

Westerterp, Klaas R.

2013, XIII, 111 p. 54 illus.

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  • An original work focused on the energy balance, especially on the limits of energy expenditure and athletic performance and is therefore different from other books dedicated to the topic of obesity  
  • Physical activity energy expenditure of modern man matches expenditures in wild mammals
  • Energetics of man and animals under one denominator
Energy balance can be maintained by adapting energy intake to changes in energy expenditure and vice versa, where short-term changes in energy expenditure are mainly caused by physical activity. Questions are whether physical activity is affected by over and under-eating, is intake affected by an increase or a decrease in physical activity, and does overweight affect physical activity? Presented evidence is largely based on studies where physical activity is quantified with doubly labeled water. Overeating does not affect physical activity while under-eating decreases habitual or voluntary physical activity. Thus, it is easier to gain weight than to lose weight. An exercise induced increase in energy requirement is compensated by intake while a change to a more sedentary routine does not induce an equivalent reduction of intake and generally results in weight gain. Overweight and obese subjects have similar activity energy expenditures than lean people despite they move less. There are two options to reverse the general population trend for an increasing body weight, reducing intake or increasing physical activity. Based on the results presented, eating less is most effective for preventing weight gain, despite a potential negative effect on physical activity when reaching a negative energy balance.​

Content Level » Graduate

Keywords » Body composition - Energy Intake - Energy expenditure - Engery balance - Excercise - Nutrition

Related subjects » Biomedical Sciences - Food Science & Nutrition - Human Physiology - Medicine

Table of contents 

Introduction, energy balance in animals.- Energy balance.- Limits in energy expenditure.- Energy expenditure, physical activity, body weight and body composition.- Extremes in energy intake.- Body weight.- Growth, growth efficiency and ageing.- Modern man in line with wild mammals.- Appendix: Simple and valid energy requirement calculation.

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