Quantitative assessment of growing hair counts, thickness and colour during and after treatments with a low-fluence, home-device laser: a randomized controlled trial
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Quantitative assessment of growing hair counts, thickness and colour during and after treatments with a low-fluence, home-device laser : a randomized controlled trial. / Thaysen-Petersen, D; Barbet-Pfeilsticker, M; Beerwerth, F; Nash, J F; Philipsen, P A; Staubach, P; Haedersdal, M.
I: British Journal of Dermatology, Bind 172, Nr. 1, 01.2015, s. 151-9.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Quantitative assessment of growing hair counts, thickness and colour during and after treatments with a low-fluence, home-device laser
T2 - a randomized controlled trial
AU - Thaysen-Petersen, D
AU - Barbet-Pfeilsticker, M
AU - Beerwerth, F
AU - Nash, J F
AU - Philipsen, P A
AU - Staubach, P
AU - Haedersdal, M
N1 - © 2014 British Association of Dermatologists.
PY - 2015/1
Y1 - 2015/1
N2 - BACKGROUND: At-home laser and intense pulsed-light hair removal continues to grow in popularity and availability. A relatively limited body of evidence is available on the course of hair growth during and after low-fluence laser usage.OBJECTIVES: To assess growing hair counts, thickness and colour quantitatively during and after cessation of low-fluence laser treatment.METHODS: Thirty-six women with skin phototypes I-IV and light to dark-brown axillary hairs were included. Entire axillary regions were randomized to zero or eight self-administered weekly treatments with an 810-nm home-use laser at 5·0-6·4 J cm(-2). Standardized clinical photographs were taken before each treatment and up to 3 months after the final treatment for computer-aided quantification of growing hair counts, thickness and colour.RESULTS: Thirty-two women completed the study protocol. During sustained treatment, there was a reduction in growing hair that reached a plateau of up to 59%, while remaining hairs became up to 38% thinner and 5% lighter (P < 0·001). The majority of subjects (77%) reported 'moderately' to 'much less hair' in treated than untreated axilla, and assessed remaining hairs as thinner and lighter (≥ 60%). After treatment cessation, hair growth gradually returned to baseline levels, and 3 months after the final treatment the count and thickness of actively growing hair exceeded pretreatment values by 29% and 7%, respectively (P ≤ 0·04).CONCLUSIONS: Sustained usage of low-fluence laser induced a stable reduction of growing hair counts, thickness and colour. The reduction was reversible and hairs regrew beyond baseline values after cessation of usage. Computer-aided image analysis was qualified for quantification of hair counts, thickness and colour after laser epilation.
AB - BACKGROUND: At-home laser and intense pulsed-light hair removal continues to grow in popularity and availability. A relatively limited body of evidence is available on the course of hair growth during and after low-fluence laser usage.OBJECTIVES: To assess growing hair counts, thickness and colour quantitatively during and after cessation of low-fluence laser treatment.METHODS: Thirty-six women with skin phototypes I-IV and light to dark-brown axillary hairs were included. Entire axillary regions were randomized to zero or eight self-administered weekly treatments with an 810-nm home-use laser at 5·0-6·4 J cm(-2). Standardized clinical photographs were taken before each treatment and up to 3 months after the final treatment for computer-aided quantification of growing hair counts, thickness and colour.RESULTS: Thirty-two women completed the study protocol. During sustained treatment, there was a reduction in growing hair that reached a plateau of up to 59%, while remaining hairs became up to 38% thinner and 5% lighter (P < 0·001). The majority of subjects (77%) reported 'moderately' to 'much less hair' in treated than untreated axilla, and assessed remaining hairs as thinner and lighter (≥ 60%). After treatment cessation, hair growth gradually returned to baseline levels, and 3 months after the final treatment the count and thickness of actively growing hair exceeded pretreatment values by 29% and 7%, respectively (P ≤ 0·04).CONCLUSIONS: Sustained usage of low-fluence laser induced a stable reduction of growing hair counts, thickness and colour. The reduction was reversible and hairs regrew beyond baseline values after cessation of usage. Computer-aided image analysis was qualified for quantification of hair counts, thickness and colour after laser epilation.
KW - Adolescent
KW - Adult
KW - Female
KW - Hair
KW - Hair Color
KW - Hair Removal
KW - Humans
KW - Laser Therapy
KW - Middle Aged
KW - Photography
KW - Self Care
KW - Treatment Outcome
KW - Young Adult
U2 - 10.1111/bjd.13254
DO - 10.1111/bjd.13254
M3 - Journal article
C2 - 25039260
VL - 172
SP - 151
EP - 159
JO - British Journal of Dermatology
JF - British Journal of Dermatology
SN - 0007-0963
IS - 1
ER -
ID: 162648285