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Table 2 Between-group difference in cardiorespiratory responses to maximal exercise at baseline and post-program

From: Effect of high-intensity interval training on cardiorespiratory fitness, physical activity and body composition in people with schizophrenia: a randomized controlled trial

   Intervention group Comparison group  
N Mean (SD) N Mean (SD) Mean diff 95% CI P
VO2max (L·min− 1) Baseline 34 2.7 (0.7) 27 2.5 (0.9) 0.05 0.2, −0.3 0.7
Post-program 20 2.7 (0.9) 26 2.6 (0.9) 0.1 0.3, − 0.1 0.3
VO2max (mL∙kg−1∙min−1) Baseline 34 32.1 (11) 27 31.1 (11) 0.9 3.6, −5.5 0.7
Post-program 21 30.8 (11) 26 31.1 (11) −1.8 −4.4, 0.8 0.17
VO2max (mL∙kgFFM−1∙min− 1) Baseline 34 44.8 (12) 27 42.6 (12) 0.2 5.5, −4.9 0.9
Post-program 20 43.4 (12) 26 43.2 (12) 1.7 5.6, −2.1 0.3
RER (VCO2/VO2) Baseline 34 1.09 (0.05) 27 1.09 (0.06) 0.00 0.02, −0.04 0.5
Post-program 21 1.10 (0.07) 26 1.08 (0.06) 0.01 0.05, −0.02 0.3
Maximal heart rate (beats·min− 1) Baseline 34 174 (22) 27 170 (17) 0.4 8, −7 0.9
Post-program 20 173 (20) 26 169 (13) 1.8 5.4, −1.7 0.3
Ventilation (L∙min− 1) Baseline 29 94 (29) 22 84 (30) 2.0 −16, 12 0.7
Post-program 21 88 (27) 24 85 (25) 3.8 −13, 5 0.4
Oxygen pulse (mL∙beats− 1) Baseline 34 15.5 (3.9) 27 14.5 (4.7) 0.4 2.3, −1.3 0.5
Post-program 19 16.0 (4.3) 25 15.2 (5.1) 0.6 2.0, −0.7 0.3
Resting heart rate (beats∙min− 1) Baseline 34 75 (12) 27 75 (16) 0.9 8, −6 0.7
Post-program 21 75 (13) 24 72 (14) 0.4 7, −6 0.8
Heart rate reserve (beats∙min−1) Baseline 34 98 (25) 27 94 (26) 0.5 10, −11 0.9
Post-program 19 97 (21) 23 97 (23) 1.2 8.8, −6.4 0.7
  1. Presented values are the mean ± SD. VO2max, peak oxygen uptake. FFM, fat-free mass. RER, respiratory exchange ratio. CI, confidence interval