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Chapter 15: Q15P (page 412)

Question: (I) Calculate the average metabolic rate of a 65-kg person who sleeps 8.0 h, sits at a desk 6.0 h, engages in light activity 6.0 h, watches TV 2.0 h, plays tennis 1.5 h, and runs 0.50 h daily.

Short Answer

Expert verified

The average metabolic rate of a 65-kg person is \(171.8\;{\rm{W}}\).

Step by step solution

01

Determination of power value

The power value can be obtained by dividing the work done value by the elapsed time value. Its value is altered linearly to the value of the work done.

02

Evaluation of average metabolic rate of a 65-kg person

From table 15-2:

The metabolic rate for sleeping is\(70\;{\rm{W}}\).

The metabolic rate for engaging in light activity like eating dressing is \(230\;{\rm{W}}\).

The metabolic rate for watching TV is \(115\;{\rm{W}}\).

The metabolic rate for playing tennis is \(460\;{\rm{W}}\).

The metabolic rate for sitting upright is\(115\;{\rm{W}}\).

The metabolic rate for running is\(1150\;{\rm{W}}\).

The average metabolic rate of a 65-kg person doing the above mentioned activities can be calculated as:

\(\begin{aligned}{c}AE &= \frac{{\left\{ \begin{aligned}{l}\left( {8.0\;{\rm{h}}} \right)\left( {70\;{\rm{W}}} \right) + \left( {6.0\;{\rm{h}}} \right)\left( {115\;{\rm{W}}} \right) + \left( {6.0\;{\rm{h}}} \right)\left( {230\;{\rm{W}}} \right) + \left( {2.0\;{\rm{h}}} \right)\left( {115\;{\rm{W}}} \right)\\ + \left( {1.5\;{\rm{h}}} \right)\left( {460\;{\rm{W}}} \right) + \left( {0.5\;{\rm{h}}} \right)\left( {1150\;{\rm{W}}} \right)\end{aligned} \right\}}}{{\left( {24\;{\rm{h}}} \right)}}\\AE &= 171.8\;{\rm{W}}\end{aligned}\)

Thus, the average metabolic rate of a 65-kg person is \(171.8\;{\rm{W}}\).

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(a) \[Q = 0,\;\Delta U = 0,\;W > 0\].

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