Changes in hair growth (4)

Changes in hair growth (4)
Compilation of experimental data

Length measurements

Following operational procedures experimental follicle positions were
examined at regular intervals, normally not exceeding 7 days. Both growing and
club hairs were measured as previously described and parallel observations were
made on control follicles. Examination commenced 1 to 2 weeks after the initial
intervention, was continued throughout the growing phase of the hair cycle, and
frequently extended to a second or third postoperative whisker. The first hair
produced was termed the first generation or Gl hair, and the second G2 and so
on. Results were tabulated and displayed graphically as a basis for further
analysis. The absence of vibrissae from follicular positions was always noted, as
were irregularities such as multiple hairs, or abnormalities in fibre thickness or shape.

Growth rates
Growth rate estimates (mm/day) were obtained by dividing the increase in
length (mm) between two points on the length measurement graphs, by the
period of time in days between the two measurements. In general the first
observation after fibre emergence was taken as the lower point, and high-point
measurements were obtained from positions as similar as possible on the respective
growth curves. Growth rates were only calculated where over half the total
club length was available.