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. 2021 Sep 30;10(19):4527. doi: 10.3390/jcm10194527

Table 2.

Exercise-related outcomes.

ME/CFS Group
(n = 20)
Healthy Group
(n = 20)
Between-Group Comparison
(p-Value)
HR, bpm
Theoretical target HR peak *
Actual achieved HR peak
Mean HR

134 (7)
140 (9)
114 (10)

140 (12)
142 (10)
119 (10)

0.149
0.453
0.092
Cycling time, min 3.86 (1.00) 4.15 (1.15) 0.401
Peak Workload 109 (25) 118 (25) 0.327
VO2 peak, mL/min/kg 16.98 (4.25) 19.96 (6.80) 0.112
VE peak, L/min 31.81 (9.67) 31.61 (11.30) 0.758
RER peak 0.76 (0.89) 72 (0.08) 0.101
RPE 16 (0.3) 12 (2) <0.001

Abbreviations: HR: heart rate, VO2 peak: peak oxygen uptake, VE peak: peak ventilation, RER peak: respiratory exchange ratio, RPE: rate of perceived exertion, * corresponds with 75% of the age-predicted target HR.