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Table 2 Baseline characteristics

From: Whole-body vibration training versus conventional balance training in patients with severe COPD—a randomized, controlled trial

  WBV balance training group conventional balance training group p-values
General
 n 24 24
 Age, ys 65 ± 7 66 ± 8 0.415
 BMI, kg/m2 25.3 ± 5.1 26.0 ± 5.2 0.398
 LTOT, n [%] 11 (46%) 8 (33%) 0.376
 FEV1, %predicted# 36.2 ± 8.4 38.0 ± 6.3 0.466
 RV, %predicted# 218.6 ± 40.4 233.4 ± 37.1 0.301
 pO2 at rest and ambient air, mmHg 61.5 ± 5.5 63.8 ± 4.1 0.155
 Comorbidities, n 2.5 [0–5] 2.4 [0–6] 0.756
 Falls during the previous year, n (%) 2 (8%) 5 (21%) 0.389
Static balance tests
 Romberg stance/eyes closed, APL [mm] 352 ± 197 387 ± 225 0.578
 Semi tandem stance/eyes closed, APL [mm] 800 ± 268 887 ± 417 0.750
 One-leg stance/eyes open, APL [mm] 786 ± 356 731 ± 276 0.844
Exercise performance tests
 6MWD, m 349 ± 68 360 ± 73 0.621
 6MWD, %predicted 53 ± 10 57 ± 10 0.155
 Knee extension, peak force [N] 267 ± 74 282 ± 99 0.733
 Knee extension, peak force [%predicted] 79 ± 17 87 ± 19 0.249
 Countermovement jump [W/kg] 23.9 ± 5.1 23.3 ± 6.0 0.517
 5-repetition sit-to-stand test [sec.] 13.4 ± 3.9 12.3 ± 4.8 0.091
 1 min sit-to-stand test [rep] 18.3 ± 4.9 19.8 ± 6.5 0.109
 4 m gait speed test [m/s2] 0.90 ± 0.15 0.97 ± 0.15 0.152
  1. Data are presented as mean ± SD or [min/max]
  2. 6MWD 6-min walk distance, APL absolute path length, BMI Body-Mass-Index, FEV1 forced expiratory volume in 1 s, LTOT long-term oxygen therapy, pO2 partial oxygen pressure, WBV whole-body vibration training
  3. #lung function was measured by bodyplethysmography (Master Screen Body, Jaeger, Germany) using reference equations from the Global Lung Function Initiative [26]