A 68-kg person walks at 5 km per hour for 1 hour a day for 1...

A 68-kg person walks at 5 km per hour for 1 hour a day for 1 year. Estimate the extra number of kilocalories of energy used because of the walking.
(a) 40,000 kcal (b) 47,000 kcal
(c) 88,000 kcal (d) 150,000 kcal

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Key Concepts

Energy Expenditure

This concept involves the calculation of the amount of energy used during physical activities. It includes understanding how factors like body mass, duration of the activity, and physical intensity interact to determine the total energy burned, typically measured in kilocalories.

Work and Power

In the context of physical activity, work is the force applied over a distance, and power is the rate at which this work is performed. These physics concepts allow us to quantify the mechanical output of activities such as walking, which is then related to energy expenditure.

Metabolic Efficiency

Humans convert chemical energy from food into mechanical energy with less than 100% efficiency, meaning that extra energy is expended above the pure mechanical work done. Understanding metabolic efficiency is crucial when estimating how much energy is actually burned during exercise.

Unit Conversion

Accurately estimating energy expenditure requires converting between various units of measurement, such as joules, watts, and kilocalories. Mastery of these conversions is essential to relate mechanical work to the dietary energy units used in nutrition and exercise science.

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