Table 1.
Participant characteristics.
| Participant Characteristics (n = 30) | |
|---|---|
| Age (years) | 62.5 ± 9.2 |
| Racial/ethnic group | |
| African American | 24 (80.0%) |
| Caucasian | 6 (20.0%) |
| Body mass index | 26.3 ± 3.8 |
| Echogenicity (GSL) a | 31.67 ± 9.41 |
| Body composition b | |
| aLM/ht2 (kg/m2) | 8.57 ± 1.12 |
| Body fat (%) | 27.8 ± 7.4 |
| Muscle tissue composition (mid-thigh CSA) c | |
| Lean mass (%) | 53.1 ± 12.1 |
| Subcutaneous fat (%) | 28.6 ± 8.3 |
| IMAT (%) | 17.1 (14.18, 22.56) |
| Muscle strength d | |
| Grip strength 0°/s (kg) | 39.5 ± 9.2 |
| Grip strength 0°/s (Adj.) | 0.49 ± 0.98 |
| Knee extensors 60°/s (Nm) | 194.8 ± 65.7 |
| Knee extensors 60°/s (Adj.) | 0.58 ± 0.16 |
| Knee extensors 180°/s (Nm) | 126.2 ± 50.7 |
| Knee extensors 180°/s (Adj.) | 0.37 ± 0.12 |
| Mobility | |
| Customary gait speed (m/s) | 1.23 ± 0.34 |
| Fast gait speed (m/s) | 1.62 ± 0.41 |
| Metabolic parameters | |
| OGTT (mg/dL) e | 105.00 (77.75, 123.50) |
| Insulin (mg/dL) | 3.74 (2.72, 6.78) |
| Glucose (uM/mL) | 92.00 (88.00, 99.25) |
| QUICKI | 0.39 (.36, 0.41) |
| TC (mg/dL) | 185.15 ± 37.79 |
| LDL (mg/dL) | 114.50 ± 36.80 |
| HDL (mg/dL) | 54.45 ± 13.48 |
| TG (mg/dL) | 81.92 ± 32.99 |
Parametric data are expressed as mean values ± SD, and non-parametric data are expressed as median values and interquartile range. GSL, grayscale levels (unitless); aLM, appendicular lean mass; CSA, cross-sectional area; IMAT, intra- and intermuscular adipose tissue; Adj., adjusted; OGTT, oral glucose tolerance test; QUICKI, quantitative insulin sensitivity check index; TC, total cholesterol; HDL, high-density lipoproteins, LDL, low-density lipoproteins; TG, triglycerides. a Echogenicity obtained from the rectus femoris of the dominant limb. b Body composition estimated using dual-energy X-ray absorptiometry (DXA). c IMAT and subcutaneous fat values derived from computed tomography attenuation at the mid-thigh of the dominant limb. d All strength values reported for the dominant limb with the adjusted values scaled for body weight. e OGTT two-hour postprandial glucose values.