Background
Methods
Study design
Measures
Statistical analyses
Results
Participant characteristics
n | % | |
---|---|---|
Sex | ||
Male | 40 | 14.9 |
Female | 229 | 85.1 |
Ethnicity | ||
Hispanic | 2 | 0.7 |
Non-Hispanic | 267 | 99.3 |
Race | ||
African American | 254 | 94.4 |
White | 14 | 5.2 |
American Indian/Alaska Native | 1 | 0.4 |
Marital Status | ||
Married | 113 | 42.0 |
Widowed | 12 | 4.5 |
Divorced | 47 | 17.5 |
Separated | 8 | 3.0 |
Never married | 89 | 33.1 |
Education | ||
Less than high school | 12 | 4.5 |
High school graduate/GED | 41 | 15.2 |
Trade or vocational school | 13 | 4.8 |
Some college | 61 | 22.7 |
College degree | 76 | 28.3 |
Some graduate/professional | 19 | 7.1 |
Graduate/professional degree | 47 | 17.5 |
Household income | ||
<$10,000 | 40 | 14.9 |
$10,000-$19,999 | 36 | 13.4 |
$20,000-$29,999 | 54 | 20.1 |
$30,000-$39,999 | 37 | 13.8 |
$40,000-$49,999 | 30 | 11.2 |
>$50,000 | 71 | 26.4 |
Current smoker | 23 | 8.6 |
Diagnosed high blood pressure | 112 | 41.6 |
Diagnosed high blood sugar | 42 | 15.6 |
Diagnosed high cholesterol | 52 | 19.3 |
Mean | SD | |
Age (years) | 44 | 12.2 |
Waist circumference (cm) | 102 | 17.6 |
Body mass index (kg/m2) | 34.7 | 8.13 |
Body fat (%) | 42.4 | 10.20 |
Fat mass (kg) | 42.3 | 18.79 |
Lean body mass (kg) | 52.4 | 12.75 |
Systolic blood pressure (mm Hg) | 126 | 19.2 |
Diastolic blood pressure (mm Hg) | 83 | 12.3 |
Total cholesterol (mg/dL) | 177 | 39.1 |
High density lipoprotein (mg/dL) | 52 | 15.0 |
Low density lipoprotein (mg/dL) | 100 | 35.4 |
Triglycerides (mg/dL) | 131 | 79.8 |
Glucose (mg/dL) | 104 | 37.4 |
6-minute walk test (distance = m) | 440 | 68.7 |
SD, standard deviation |
Pedometer-determined steps/day
Mean | Median | SD | Min | Max | |
---|---|---|---|---|---|
Full dataset (n=27,903 individual steps/day)
| |||||
Mean steps/day | 7268 | 6918 | 3984 | 511 | 30628 |
Met 7,500 steps/daya
| 40.1 | 39.0 | 29.5 | 0.0 | 98.5 |
Met 10,000 steps/daya
| 26.3 | 16.9 | 27.2 | 0.0 | 97.0 |
6-category SD-PA (n, %) | |||||
Basal (<2,500 steps) | 11 | 4.6 | |||
Limited (2,500-4,999 steps) | 61 | 25.5 | |||
Low active (5,000-7,499 steps) | 69 | 28.9 | |||
Somewhat active (7,500-9,999 steps) | 54 | 22.6 | |||
Active (10,000-12,499 steps) | 29 | 12.1 | |||
Highly active (≥12,500 steps) | 15 | 6.3 | |||
Change in mean steps/dayb
| 2013 | 1205 | 3257 | −7640 | 17819 |
Change in median steps/dayb
| 2102 | 1386 | 3668 | −8656 | 23730 |
Change in 6-category SD-PAb
| 0.7 | 0.0 | 1.10 | −3 | 4 |
Change in 4-category SD-PAb
| 0.5 | 0.0 | 0.96 | −3 | 3 |
Truncated dataset (n=27,903 individual steps/day)
| |||||
Mean steps/day | 7221 | 6914 | 3721 | 743 | 24575 |
Met 7,500 steps/daya
| 40.1 | 39.0 | 29.5 | 0.0 | 98.5 |
Met 10,000 steps/daya
| 26.3 | 16.9 | 27.2 | 0.0 | 97.0 |
Change in mean steps/dayb
| 1950 | 1205 | 3001 | −7427 | 13481 |
Change in median steps/dayb
| 2093 | 1386 | 3596 | −8464 | 21422 |
Change in 6-category SD-PAb
| 0.7 | 0.0 | 1.09 | −3 | 4 |
Change in 4-category SD-PAb
| 0.5 | 0.0 | 0.95 | −3 | 3 |
Excluded dataset (n=27,132 individual steps/day)
| |||||
Mean steps/day | 7279 | 6972 | 3417 | 1276 | 20637 |
Met 7,500 steps/daya
| 40.8 | 40.1 | 29.5 | 0.0 | 98.5 |
Met 10,000 steps/daya
| 26.6 | 17.3 | 27.3 | 0.0 | 97.0 |
Change in mean steps/dayb
| 1855 | 1257 | 2710 | −5931 | 13237 |
Change in median steps/dayb
| 1954 | 1344 | 3084 | −5040 | 15906 |
Change in 6-category SD-PAb
| 0.7 | 1.0 | 1.02 | −2 | 4 |
Change in 4-category SD-PAb
| 0.6 | 0.0 | 0.92 | −2 | 3 |
Anthropometric and clinical parameter associations
n | r | P | r | P | ||
---|---|---|---|---|---|---|
Mean steps/day
|
Median steps/day
| |||||
Waist Circumference | 178 | −0.08 | NS | Waist Circumference | −0.10 | NS |
Body mass index | 179 | −0.12 | NS | Body mass index | −0.12 | NS |
% Body fat | 177 | −0.15 | 0.0469 | % Body fat | −0.15 | 0.0473 |
Fat mass | 177 | −0.08 | NS | Fat mass | −0.08 | NS |
Lean body mass | 177 | −0.05 | NS | Lean body mass | −0.05 | NS |
Total cholesterol | 179 | −0.13 | 0.0825 | Total cholesterol | −0.15 | 0.0472 |
HDL | 177 | 0.01 | NS | HDL | 0.02 | NS |
LDL | 153 | −0.09 | NS | LDL | −0.09 | NS |
Triglycerides | 179 | −0.12 | NS | Triglycerides | −0.11 | NS |
Glucose | 179 | −0.11 | NS | Glucose | −0.11 | NS |
SBP | 179 | 0.00 | NS | SBP | 0.01 | NS |
DBP | 179 | 0.00 | NS | DBP | 0.00 | NS |
Met 7,500 steps/day
b
|
Met 10,000 steps/day
b
| |||||
Waist Circumference | 178 | −0.06 | NS | Waist Circumference | −0.05 | NS |
Body mass index | 179 | −0.05 | NS | Body mass index | −0.13 | 0.0940 |
% Body fat | 177 | −0.10 | NS | % Body fat | −0.15 | 0.0433 |
Fat mass | 177 | −0.03 | NS | Fat mass | −0.11 | NS |
Lean body mass | 177 | −0.03 | NS | Lean body mass | −0.04 | NS |
Total cholesterol | 179 | −0.16 | 0.0317 | Total cholesterol | −0.14 | 0.0638 |
HDL | 177 | −0.01 | NS | HDL | −0.01 | NS |
LDL | 153 | −0.04 | NS | LDL | 0.00 | NS |
Triglycerides | 179 | −0.15 | 0.0472 | Triglycerides | −0.13 | 0.0741 |
Glucose | 179 | −0.13 | 0.0862 | Glucose | −0.09 | NS |
SBP | 179 | 0.01 | NS | SBP | 0.03 | NS |
DBP | 179 | −0.02 | NS | DBP | −0.01 | NS |
Change in mean steps/day
c
|
Change in median steps/day
c
| |||||
Waist Circumference | 165 | −0.14 | 0.0812 | Waist Circumference | −0.16 | 0.0395 |
Body mass index | 166 | −0.28 | 0.0003 | Body mass index | −0.27 | 0.0005 |
% Body fat | 164 | −0.26 | 0.0008 | % Body fat | −0.24 | 0.0020 |
Fat mass | 164 | −0.23 | 0.0027 | Fat mass | −0.21 | 0.0068 |
Lean body mass | 164 | −0.05 | NS | Lean body mass | −0.06 | NS |
Total cholesterol | 166 | −0.10 | NS | Total cholesterol | −0.13 | NS |
HDL | 164 | 0.05 | NS | HDL | 0.08 | NS |
LDL | 141 | −0.10 | NS | LDL | −0.12 | NS |
Triglycerides | 166 | −0.04 | NS | Triglycerides | −0.07 | NS |
Glucose | 166 | −0.08 | NS | Glucose | −0.07 | NS |
SBP | 166 | 0.03 | NS | SBP | 0.03 | NS |
DBP | 166 | −0.01 | NS | DBP | 0.01 | NS |
Change in 6-category SD-PA
c
|
Change in 4-category SD-PA
c
| |||||
Waist Circumference | 165 | −0.10 | NS | Waist Circumference | −0.11 | NS |
Body mass index | 166 | −0.22 | 0.0044 | Body mass index | −0.20 | 0.0101 |
% Body fat | 164 | −0.26 | 0.0008 | % Body fat | −0.22 | 0.0052 |
Fat mass | 164 | −0.26 | 0.0006 | Fat mass | −0.23 | 0.0032 |
Lean body mass | 164 | 0.06 | NS | Lean body mass | 0.05 | NS |
Total cholesterol | 166 | −0.10 | NS | Total cholesterol | −0.08 | NS |
HDL | 164 | 0.05 | NS | HDL | 0.07 | NS |
LDL | 141 | −0.07 | NS | LDL | −0.02 | NS |
Triglycerides | 166 | −0.03 | NS | Triglycerides | −0.06 | NS |
Glucose | 166 | −0.06 | NS | Glucose | −0.05 | NS |
SBP | 166 | 0.08 | NS | SBP | 0.05 | NS |
DBP | 166 | 0.03 | NS | DBP | 0.01 | NS |
Multivariate linear regression models
Datasetb
| ||||||||
---|---|---|---|---|---|---|---|---|
Full | Truncated | Excluded | ||||||
Outcome | Steps/Day Indicator | βc
|
P
| βc
|
P
| βc
|
P
| Covariatesd,e
|
Waist circumference | Change in mean steps/dayf
| −0.33 | 0.0476 | −0.38 | 0.0419 | −0.45 | 0.0296 | BMI, BV |
Change in median steps/dayf
| −0.33 | 0.0269 | −0.33 | 0.0283 | −0.45 | 0.0123 | BMI, BV | |
Body mass index | Met 10,000 steps/dayg
| −1.05 | 0.0017 | −1.05 | 0.0017 | −1.04 | 0.0017 | Age, BV |
Change in mean steps/dayf
| −0.11 | <0.0001 | −0.12 | <0.0001 | −0.13 | <0.0001 | Age, BV | |
Change in median steps/dayf
| −0.10 | <0.0001 | −0.10 | <0.0001 | −0.12 | <0.0001 | Age, BV | |
Change in 6-category SD-PAf
| −0.27 | 0.0009 | −0.28 | 0.0006 | −0.34 | 0.0001 | Age, BV | |
Change in 4-category SD-PAf
| −0.29 | 0.0020 | −0.29 | 0.0018 | −0.34 | 0.0005 | Age, BV | |
% Body fat | Mean steps/day | −0.15 | 0.0004 | −0.16 | 0.0006 | −0.17 | 0.0078 | Age, sex, BV |
Median steps/day | −0.14 | 0.0006 | −0.14 | 0.0007 | −0.15 | 0.0084 | Age, sex, BV | |
Met 10,000 steps/dayg
| −2.23 | 0.0007 | −2.23 | 0.0007 | −2.25 | 0.0006 | Age, sex, BV | |
Change in mean steps/dayf
| −0.21 | 0.0001 | −0.22 | 0.0002 | −0.23 | 0.0004 | Age, sex, fitness, BV | |
Change in median steps/dayf
| −0.15 | 0.0016 | −0.17 | 0.0005 | −0.20 | 0.0006 | Age, sex, fitness, BV | |
Change in 6-category SD-PAf
| −0.56 | 0.0005 | −0.57 | 0.0004 | −0.64 | 0.0002 | Age, sex, fitness, BV | |
Change in 4-category SD-PAf
| −0.53 | 0.0036 | −0.55 | 0.0029 | −0.70 | 0.0007 | Age, sex, income, fitness, BV | |
Fat mass | Change in mean steps/dayf
| −0.29 | <0.0001 | −0.32 | <0.0001 | −0.35 | <0.0001 | Age, sex, BV |
Change in median steps/dayf
| −0.25 | <0.0001 | −0.25 | 0.0001 | −0.30 | <0.0001 | Age, sex, BV | |
Change in 6-category SD-PAf
| −0.88 | <0.0001 | −0.90 | <0.0001 | −1.02 | <0.0001 | Age, sex, BV | |
Change in 4-category SD-PAf
| −0.90 | 0.0002 | −0.91 | 0.0001 | −1.05 | <0.0001 | Age, sex, BV | |
Total cholesterol | Mean steps/day | NS | NS | NS | BV | |||
Median steps/day | NS | NS | NS | BV | ||||
Met 7,500 steps/dayg
| NS | NS | NS | BV | ||||
Met 10,000 steps/dayg
| NS | NS | NS | BV | ||||
Triglycerides | Met 7,500 steps/dayg
| NS | NS | NS | Fitness, BV | |||
Met 10,000 steps/dayg
| NS | NS | NS | Fitness, BV | ||||
Glucose | Met 7,500 steps/dayg
| NS | NS | NS | DX, fitness, BV |