Table 1.
Means and standard deviations for all study variables
| African American |
European American |
P | |
|---|---|---|---|
| Age (years) | 33.6 ± 5.5 | 34.2 ± 6.3 | 0.61 |
| Height (cm) | 164.0 ± 7.9 | 165.0 ± 5.5 | 0.49 |
| Total body mass (kg) | 62.8 ± 7.3 | 64.2 ± 5.1 | 0.27 |
| BMI (kg/m2) | 23.3 ± 1.5 | 23.6 ± 1.1 | 0.28 |
| Body fat % | 32.2 ± 5.4 | 32.6 ± 4.3 | 0.69 |
| Knee extension strength (kg) | 36.6 ± 14.7 | 41.0 ± 12.6 | 0.12 |
| VO2max (ml/kg/min) | 29.5 ± 4.8 | 33.7 ± 5.5 | <0.01 |
| VO2 for 3 mph walk (ml/kg/min) | 11.6 ± 2.3 | 12.3 ± 1.6 | 0.08 |
| Treadmill endurance (min) | 5.82 ± 1.09 | 6.59 ± 1.37 | <0.01 |
| OxPhos rate (mmol ATP/L/s) | 0.24 ± 0.09 | 0.30 ± 0.10 | 0.07 |
| AnGly rate (mmol ATP/L/s) | 0.129 ± 0.074 | 0.173 ± 0.079 | <0.05 |
| CK rate (mmol ATP/L/s) | 0.068 ± 0.050 | 0.072 ± 0.034 | 0.67 |
| ME (N cm2 mmol ATP/L) | 22.1 ± 8.8 | 19.8 ± 0.6.9 | 0.29 |
| Max force (N/cm2) | 13.9 ± 2.4 | 14.1 ± 2.5 | 0.71 |
| End force (N/cm2) | 9.8 ± 3.0 | 10.0 ± 2.5 | 0.73 |
| Muscle fatigue (N/cm2) | 4.1 ± 2.0 | 4.1 ± 1.8 | 0.71 |
P shows independent t test probability for differences between African American (n = 49 for all variables except 31P MRS variables for which n = 21) and European American (n = 47 for all variables except 31P MRS variables for which n = 33) women