title: Influence of cut-points on patterns of accelerometry-measured free-living physical activity in rural and urban black South African women.
abstract: BACKGROUND
  We describe the effect of 2 different accelerometer cut-points on physical activity (PA) patterns in rural and urban black South African women.
  
  
  METHODS
  Hip-mounted uni-axial accelerometers were worn for 6 to 7 days by rural (n = 272) and urban (n = 16) participants. Twenty-hour (4 AM to 12 AM) PA counts (cts) and volumes (min·day⁻¹) were extracted: sedentary (SED, <100 cts·min⁻¹), light (100-759 cts·min⁻¹), moderate-1 (MOD1, 760-1951 cts·min⁻¹), moderate-2 to vigorous (MOD2VG, ≥1952 cts·min⁻¹), and bouts ≥10 min for ≥760 cts·min⁻¹ (MOD1VGbt) and ≥1952 cts·min⁻¹ (MOD2VGbt).
  
  
  RESULTS
  Valid data were obtained from 263 rural women and 16 urban women. Total counts and average counts were higher (+80,399 cts·day⁻¹, +98 cts·min⁻¹.day⁻¹) (P < .01), SED lower (-61 min·day⁻¹, P = .0042), MOD1 higher (+65 min·day⁻¹, P < .0001), and MOD1VGbt higher (+19 min·day⁻¹, P = .0179) in rural women compared with urban women. Estimated adherence (≥30 min·day⁻¹ for 5 days·wk⁻¹) was 1.4-fold higher in rural women than urban women for MOD-1VGbt, but 3.3-fold higher in urban women than rural women for MOD2VGbt.
  
  
  CONCLUSIONS
  Rural women accumulate greater amounts of PA than urban women within a particular count band. Depending on which moderate PA cut-point was used to estimate PA public health adherence, rural women could be classified as less physically active than urban women.
authors.affiliation: Physical Activity Epidemiology Laboratory, University of Limpopo, Polokwane, South Africa.
authors.forename: Ian
authors.initials: I
authors.lastname: Cook
authors.forename: Marianne
authors.initials: M
authors.lastname: Alberts
authors.forename: Estelle V
authors.initials: EV
authors.lastname: Lambert
mesh_terms: D000054:Acceleration; D056044:Actigraphy / Q000295:instrumentation*; D000328:Adult; D005080:Exercise Test / Q000295:instrumentation*; D005260:Female; D006293:Health Promotion; D006801:Humans; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D012424:Rural Population; D013019:South Africa; D014505:Urban Population; D016387:Women's Health; D055815:Young Adult