Page 65 - Chapter 3 - An Introduction to Laser/IPL Hair Removal

Chapter 3 – Fundamentals of Laser/IPL Hair Removal 1st Edition
sessions. As a direct consequence, the industry has adopted a rather haphazard approach to guestimating these intervals.
Many laser/IPL operators are trained to leave 4 or 6 or 8 or ‘whatever’ weeks between sessions, with virtually no explanation as to why!
So, we put together a computer model to investigate this more thoroughly, using data that we do know.
Clinical studies in the 1960s and 70s investigated the growth rates of hair across the body in youngish, healthy individuals with no underlying medical issues. Table 8 shows what they found (Richards & Merhag).
All hair goes through the standard anagen-catagen-telogen growth cycle. In most cases, the catagen phase lasts for around two weeks. So, the data above gives us a good idea of the rate at which hair grows and the percentages of hair in the anagen or telogen phase.
We constructed a model in Microsoft Excel which describes these growth patterns over a year.
Here is our blog post on this model, explaining how it works in more detail.
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