Table 2.
Descriptive Statistics (Mean [95% CI]) for Body Composition and Cardiorespiratory Fitness by Sex and Race
| Measure | Boys (n = 9) | Girls (n = 11) | White (n = 11) | African American (n = 9) |
|---|---|---|---|---|
| FFM, kg | 48.4 (42.4–54.4) | 43.5 (37.1–49.9) | 45.7 (38.9–52.5) | 45.7 (39.9–51.5) |
| Fat mass index, kg/m2 | 10.6 (8.0–13.2) | 12.2 (10.4–14.0) | 11.7 (10.5–12.9) | 11.1 (8.1–14.1) |
| %BF | 36.2 (32.0–40.4) | 41.2 (37.6–44.8) | 40.2 (36.8–43.6) | 37.4 (32.2–42.6) |
| VAT, kga | 0.95 (0.61–1.29) | 0.82 (0.62–1.02) | 1.04** (0.86–1.22) | 0.64 (0.34–0.94) |
| SAT, kga | 7.51 (4.87–10.15) | 9.50 (7.64–11.36) | 8.49 (6.89–10.09) | 8.81 (5.43–12.19) |
| VO2peak, mL/kg BW/min | 28.7* (24.7–32.7) | 21.8 (19.0–24.6) | 25.6 (21.2–30.0) | 24.1 (20.5–27.7) |
| VO2peak, mL/kg FFM/min | 47.1* (42.1–52.1) | 39.3 (34.3–44.3) | 44.7 (39.1–50.3) | 40.5 (35.7–45.3) |
| Delta efficiency, % | 27.8 (25.8–29.8) | 30.4 (28.6–32.2) | 29.2 (26.8–31.6) | 29.3 (28.1–30.5) |
Abbreviations: BW, body weight; CI, confidence interval; FFM, fat-free mass; SAT, subcutaneous adipose tissue; VAT, visceral adipose tissue; VO2peak, peak aerobic capacity; %BF, percentage body fat.
a
n = 18 due to poor quality MRI data in 2 participants.
*
P < .05 in independent samples t tests of boys versus girls.
**
P < .05 in independent samples t tests of white versus African American.