Abstract
Peak expiratory flow (PEF) can be self-measured. Self-measurements of PEF on a long-term basis permit assessment of the time structure of PEF and its relation to solar activity expressed in Wolf's relative sunspot number. The results from a longitudinal record spanning 32.5 years were compared with four other shorter series. It appeared that the most prominent periodicity in the annual and infra-annual response of the spectrum was a component with a period of 11.74 years. This periodicity was comparable with the periodicity found for Wolf's relative sunspot number (10.27) during the same span of time.
Original language | English (US) |
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Pages (from-to) | 261-266 |
Number of pages | 6 |
Journal | Scripta Medica Facultatis Medicae Universitatis Brunensis Masarykianae |
Volume | 75 |
Issue number | 5 |
State | Published - Dec 1 2002 |
Keywords
- Circadecennian rhythm
- Peak expiratory flow
- Self-measurement