“…Estimated VO 2 max was measured in four studies [ 18 , 19 , 28 , 29 ], VO 2 peak in three studies [ 17 , 22 , 32 ] and VO 2 AT in one study [ 30 ]. Of those that did not measure VO 2 , two studies used a Balke treadmill test [ 26 , 28 ], one used a cycle ergometer test (pulse-rate-controlled submaximal 6 min exercise test with target heart rate ≥ 140 bpm) [ 31 ], and three used a walk or run test (6 min walk test, 4-m walk test, 2-mile walk or run test) [ 23 , 24 , 25 ]. CRF was examined before [ 18 , 27 ], during [ 19 , 23 , 24 , 28 , 29 , 30 , 31 ], and after [ 17 , 22 , 23 , 25 , 26 , 32 ] pregnancy in two, seven, and six studies, respectively (one study examined CRF both during pregnancy and postpartum [ 23 ]).…”