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(A) Forest plot showing the effect of short-term exercise intervention on VO2 max in CHF patients who were 50–55 years old (i), 60–65 years old (ii), and 69–75 years old (iii). (B) Forest plot showing the effect of short-term exercise intervention on VO2 max in CHF patients: (i) aerobic exercise; (ii) resistance exercise; (iii) aerobic with resistance exercise. CHF = chronic heart failure.
