Procedures
Participants in all 5 study arms completed group-training sessions 3 times per week for 20 weeks. Each session lasted 90 minutes and included 30 minutes of cognitive training (active or sham), followed by 60 minutes of aerobic-resistance or the control exercise (balance and toning). All participants received a capsule of vitamin D (a 10 000 IU dose) or matching placebo 3 times per week for 20 weeks.Participants performed cognitive training (Neuropeak; detailed description in eMethods in The supervised progressive exercise program combined aerobic and resistance training based on exercise prescription for older adults (eMethods in 