# KB0015: Changing Respiratory Band Settings within the HRV Application

### How to change respiratory band settings within the HRV application:

Step 1: Open the HRV application and select the HRV Calibration Settings tab.

Step 2: Within the HRV Calibration Settings tab change the HF/RSA Band (Hz) to to coincide with the relevant band settings for the population you are studying. Next, change the high end of your LF band (Hz) to match the low end on your HF/RSA Band (Hz).

### Deciding when to change band-pass:

The following table shows the ranges of respiration rates covering 90% of people, as a function of age. It will help you decide at what age to change band-pass. But, always ensure that your subject sample falls within the respiration bands that are set.

Respiration Rates as a function of Age1
Age Resp Rate
< 6 Mo. 35-60
6-12 Mo. 30-50
2 Yr. 25-40
3 Yr. 22-34
4 Yr. 20-28
6 Yr. 18-25
9 Yr. 17-23
12 Yr. 16-22
15 Yr. 16-22
18 Yr. 12-18

Deriving respiration frequency bands:

Frequency bands can be derived from the respiration frequencies included in the chart above by dividing the rate by 60 to get the frequency.

For example:

A participant that is < 6 months of age typically has a respiration rate of (35-60). So, the range for respiration rate is (35/60 – 60/60), or nominally (0.58 – 1.0 Hz) for the HF/RSA band, but with a “safety” band that could be (0.5 – 1.1 Hz) for the HF/RSA band.

A participant that is < 6 -12 months of age typically has a respiration rate of (30-50). So the range is (30/60 to 50/60), or nominally (0.5 – 0.83 Hz) for the HF/RSA band, but again with a safety band maybe (0.4 – 1.0 Hz) for the HF/RSA band.

Steve Porges2 recommends:

For neonates, using a band-pass range of (0.3 – 1.3 Hz) for the HF/RSA band.

For children,  using a band-pass range of (0.24 – 1.04 Hz) for the HF/RSA band.

To be conservative, Porges has a somewhat wider band than that derived from expected respiration frequency, and there is no problem with opening up the band a bit. But, it is important to use the same band for all subjects, so the 0.3 (or 0.24) to 1.3 would be a good choice for a wide range of young ages.

#### References

1. Sanddal, N.D., et al. (1997). Critical Trauma Care by the Basic EMT, 4th ed.
2. Porges, S. W. (1986). Respiratory sinus arrhythmia: Physiological basis, quantitative methods, and clinical implications. In Cardiorespiratory and cardiosomatic psychophysiology (pp. 101-115). Springer US.