title: A Relationship between Physical Activities and Hand Dermatitis: An Epidemiology Study of the USA Population.
abstract: BACKGROUND
  Hand dermatitis is a common, chronic relapsing skin disease, resulting from a variety of causes including endogenous predisposition and environmental exposures to irritants and allergens. Physical activities have been reported to be beneficial for patients with hand dermatitis.
  
  
  OBJECTIVE
  We aim to evaluate the association between self-reported physical activities and hand dermatitis using the 2003-2004 National Health and Nutrition Examination Survey (NHANES) database.
  
  
  METHODS
  Information regarding 2,688 participants aged 20 to 59 years from the 2003-2004 NHANES cycle were retrieved and analyzed. Diagnosis of hand dermatitis was based on standardized photographs of the hands read by two dermatologists. Physical activity during leisure time for the prior 30 days was assessed using standardized questionnaire. Based on the suggested MET scores provided for each response in the questionnaire section of the NHANES methodology, the MET scores for average level of physical activities, walking/bicycling, and performing tasks around home/yard for the past 30 days was calculated.
  
  
  RESULTS
  There were 42 (1.56%) diagnosed cases of active hand dermatitis among the 2,688 participants. Those who reported recent vigorous or moderate physical activities were less likely to have a diagnosis of active hand dermatitis (OR: 0.436, 95% CI: 0.200 to 0.947, P = 0.036 and OR: 0.489, 95% CI: 0.261 to 0.916, P = 0.025, respectively). This negative association remained statistically significant even after adjusting for age, gender, ethnic groups and atopic diathesis.
  
  
  CONCLUSIONS
  Moderate and vigorous levels of physical activities appeared to be beneficial for hand dermatitis. Therefore, it is important to advise patients with active hand dermatitis to remain physically active. However, clinicians should also be cognizant of the fact that the heat and sweat generated from physical activities might also exacerbate the condition.
authors.affiliation: Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, United States.
authors.forename: Yi Chun
authors.initials: YC
authors.lastname: Lai
authors.affiliation: Department of Dermatology, National Skin Centre, Singapore 308205.
authors.forename: Yik Weng
authors.initials: YW
authors.lastname: Yew
keywords: Epidemiology; hand dermatitis; physical activities