Table 1.
Baseline Characteristics of the Participants (N = 554)
| Characteristic | Median (IQR) or n (%) |
|---|---|
| Age (y) | 70.0 (60.0, 80.0) |
| Sex, male | 241 (43.5%) |
| Race, white | 367 (66.2%) |
| Lean mass (kg) | 43.5 (37.9, 53.8) |
| Fat mass (kg) | 24.7 (18.9, 31.8) |
| Chronic conditions | 1.0 (0.0, 2.0) |
| Cardiovascular diseasea | 44 (7.9%) |
| Hypertensionb | 219 (39.5%) |
| Diabetesc | 87 (15.7%) |
| Cancerd | 151 (27.3%) |
| Strokee | 22 (4.0%) |
| Perceived fatigability (RPE) | 7.0 (7.0, 9.0) |
| kPCr (/100 s) | 2.0 (1.7, 2.4) |
| RER change rate (/min)f | 0.01 (0.00, 0.02) |
| VeT (L/min)g | 57.3 (45.1, 76.4) |
Notes: IQR = interquartile range; RPE = rating of perceived exertion.
aIncluding myocardial infarction, congestive heart failure, angina pectoris, bypass surgery or (balloon) angioplasty, or peripheral arterial disease. bIncluding diagnosis of hypertension and taking antihypertensive medications. cIncluding diagnosis of diabetes and current medication for diabetes. dNon-skin (squamous or basal cell) cancer. eStroke or transient ischemic attack. fRER change rate = slope of respiratory exchange ratio from second to fifth minute during slow 5-min treadmill walk. gVeT = ventilatory threshold during maximal treadmill test.