Pediatrics published a study reporting that 126 children (mean age 10 years old) with a preterm birth history (born at 27-34 weeks) displayed a significant impairment in exercise capacity as compared to full term peers in control group.

Reference:  Smith, Lucia Jane, van Asperen, Peter Paul, McKay, Karen Olwyn, Selvadurai, Hiran, Fitzgerald, Dominic Adam

Reduced Exercise Capacity in Children Born Very Preterm

Pediatrics 2008 122: e287-e293