ABSTRACT
This chapter aims to provide an understanding of the scientific principles of energy, work and power as applied to the theory which underpins exercise and sport. After reading this chapter, you should be able to:
INTRODUCTION
Energy is a very important consideration, not only in exercise and sport, but also in daily activities. The human body relies upon a supply of energy to continue to move and to perform essential daily functions. Energy is used for growth, repair, digestion and storage of food, and of course physical activity. The continual supply of energy to the human body is through the diet, and hence the importance of nutrition for prolonged physical performance, where energy expenditure is substantial. Unlike plants, the human body cannot obtain energy directly from the sun (i.e. photosynthesis), and therefore relies upon plants, and the animals that eat those plants, for energy. When considering energy, it is important to understand the implications of the first law of thermodynamics, which states:
Energy can neither be created nor destroyed, just changed from one form to another.
