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Table 1 Effetcs of a 16-week exercise program on physical capacity in a 7-year-old patient with juvenile dermatomyositis (JDM) patient and in her unaffected monozygotic twin sister.

From: Responsiveness to exercise training in juvenile dermatomyositis: a twin case study

  Healthy twin JDM twin
Variable Pre Post Δ (%) Pre Post Δ (%)
1RM bench press (Kg) 13.0 17.0 30.8 13.0 17.0 30.8
1RM leg press (Kg) 25.0 30.0 20.0 13.0 15.0 15.4
Handgrip (Kg) 7.0 9.0 28.6 4.0 5.5 37.5
Low-back strength (Kg) 40.0 47.0 17.5 35.0 40 12.5
Timed-stands test (rep) 18.0 19.0 5.5 15.0 18.0 12.0
Timed-up-and-go test (s) 6.6 6.1 -7.6 8.8 6.2 -29.5
VO2peak (mL/Kg/min) 42.2 44.7 6.0 41.3 43.6 5.6
Exercise time at VAT (min) 6.0 10.3 71.7 3.0 8.0 166.7
VAT (% VO2peak) 80.1 80.5 0.5 57.5 67.8 17.9
VAT (mph) 3.5 3.5 0.0 2.5 3.5 40.0
Time-to-exhaustion (min) 13.3 15.3 15.0 12.3 14.3 16.3
  1. Abbreviations: RM = maximum repetition; VO2peak = peak oxygen consumption; VAT = ventilatory anaerobic threshold; Δ = Delta.