List of the time for the last 50m of world records
List of the time for the last 50m of world records:
Time of last 50m for Man / Woman
100m free 24.74 / 26.61
200m free 25.70 / 28.60
400m free 25.77 / 29.36
800m free 25.99 / 29.66
1500m free 25.94 / 29.27
200m IM 27.49 / 29.84 <---
400m IM 27.85 / 28.93 <--- Ye Shiwen
So Shiwen Ye's time for the last 50m of 400m IM is normal.
And it is Lochte's time of the last 50m (29.10sec) that is too slow,
but of course, Lochte didn't break Phelps's record.