Variability in coefficient of restitution in human facial skin

K R Anderson; J J Oleson; T R Anthony

doi:10.1111/srt.12126

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Variability in coefficient of restitution in human facial skin

Journal article

Open access

Peer reviewed

Variability in coefficient of restitution in human facial skin

K R Anderson, J J Oleson and T R Anthony

Skin research and technology, Vol.20(3), pp.355-362

08/2014

DOI: 10.1111/srt.12126

PMCID: PMC4753564

PMID: 24628680

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http://doi.org/10.1111/srt.12126View

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Abstract

If particles rebound on human facial skin, they can be re-entrained into the airflow and subsequently inhaled, increasing aspiration efficiency estimates. A realistic estimate of facial skin coefficient of restitution (CoR) is necessary to accurately model particle bounce. This study investigated the effects of sampling location, temperature, humidity levels, age, gender, and BMI on facial skin CoR. A torsional ballistometer was used to measure facial CoR for 30 participants divided into three age groups (18-30, 31-40, and 41-65 years), at three temperatures and three humidity levels. The study was repeated twice: once in the late winter and once in the early summer to capture the seasonal variability. The CoR significantly varied across five facial locations, with values ranging from 0.55 to 0.75. Gender, sampling season and the interaction between sampling location and age were found to be significant, but changes in values were relatively small (0.05 at most) and are not considered practically significant. CoR was non-uniform across the face. The use of uniform CoR value as modeling input parameters or for mannequin facial surfaces in experimental wind tunnel studies may not be accurate due to the high variability in CoR between facial sampling locations.

Viscosity

Motion

Reproducibility of Results

Humans

Middle Aged

Male

Face - physiology

Sex Characteristics

Skin Physiological Phenomena

Young Adult

Energy Transfer - physiology

Aging - physiology

Sensitivity and Specificity

Adolescent

Humidity

Adult

Elastic Modulus - physiology

Female

Aged

Seasons

Details

Title: Subtitle: Variability in coefficient of restitution in human facial skin
Creators: K R Anderson - Department of Occupational and Environmental Health, University of Iowa, Iowa City, IA, USA
J J Oleson
T R Anthony
Resource Type: Journal article
Publication Details: Skin research and technology, Vol.20(3), pp.355-362
DOI: 10.1111/srt.12126
PMID: 24628680
PMCID: PMC4753564
NLM abbreviation: Skin Res Technol
ISSN: 0909-752X
eISSN: 1600-0846
Publisher: England
Grant note: R01OH009290-01 / NIOSH CDC HHS R01 OH009290 / NIOSH CDC HHS T42OH00849 / NIOSH CDC HHS
Language: English
Date published: 08/2014
Academic Unit: Occupational and Environmental Health; Biostatistics
Record Identifier: 9983997343802771

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