
ALT Abstract During pregnancy an increased cardiac output ( ̇Q) and blood volume (BV) occur to support fetal growth. Increased ̇Q and BV also occur during chronic endurance exercise training and benefit performance. We investigated if sprint interval training (SIT) undertaken early postpartum maintains the elevated ̇Q and BV of pregnancy and benefits performance. The participant, a competitive field hockey player and former cyclist, visited our laboratory at 2 weeks of gestation (baseline) and postpartum pre-, mid- and post-intervention (PP pre , PP mid and PP post ). Delivery was uncomplicated and she felt ready to start the SIT programme 5 weeks postpartum. Inert gas rebreathing was used to measure peak exercise ̇Q ( ̇Q peak ); ̇V O 2 peak was measured with a metabolic cart; and postpartum haematological values were measured with carbon monoxide rebreathing. The 18 SIT sessions progressed from four to eight sprints at 130% of ̇V O 2 peak peak power output. ̇Q peak increased from baseline

















