Monitoring perceived rate of exertion
The Perceived Rate of Exertion Scale (PRE) is based on a mother’s ability to rate (according to a number scale) her body’s response to exercise. Each number on the scale represents a description of the mother’s perceived rate of exercise intensity.
In a class of 10 pregnant women, the PRE scale may vary from 7–19 depending on age, fitness and stage of pregnancy.
No one knows your body better than you do – you are the best judge of how you are feeling. This form of exercise monitoring can be used in conjunction with pulse taking and the “talk test”.
| How does exercise feel? | Rating |
| Very, very light | 6 / 7 / 8 |
| Very light | 9 / 10 |
| Fairly light | 11 / 12 |
| Somewhat hard | 13 / 14 |
| Hard | 15 / 16 |
| Very hard | 17 / 18 |
| Very, very hard | 19 / 20 |
You should be working at a rate of 13–15 on the PRE scale, at a pace that you would describe as “moderately challenging”.
Resting pulse
Your resting pulse rate, which should be taken before rising in the morning, will increase slightly as your pregnancy advances, and may drop as you become fitter.
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