Which of the following can be used to calculate heart rate?

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1. To calculate the heart rate, one common method is to use an electrocardiogram (ECG). In an ECG, the time interval between successive R waves (the R-R interval) is measured.

2. If the R-R interval is measured in seconds, the heart rate in beats per minute (bpm) can be calculated as  
   $$
   \text{Heart Rate} = \frac{60}{\text{R-R interval (in seconds)}}
   $$

3. Alternatively, if the pulse is counted over a fixed interval (for example, 10 seconds), the heart rate can be computed by multiplying the number of beats counted by 6, since  
   $$
   10 \text{ seconds} \times 6 = 60 \text{ seconds}
   $$

Thus, methods such as using an ECG or manually counting the pulse over a set time period (and then scaling up to one minute) can be used to calculate the heart rate.
To calculate heart rate, you can use an electrocardiogram (ECG) by measuring the R-R interval and then using the formula: $$ \text{Heart Rate} = \frac{60}{\text{R-R interval (in seconds)}} $$ Alternatively, count the number of heartbeats over 10 seconds and multiply by 6 to get the heart rate per minute. So, methods like ECG or manual pulse counting can be used to determine heart rate.

Which of the following can be used to calculate heart rate?

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