Each frame is .1 seconds apart. This sequence is from Susan O'Neill's semi-final 200-m race in which she set a new meet record of 2:06.53. It should be compared to other breathing-stroke sequences of this swimmer in this section of the Swimming Science Journal. In this presentation, only general comments will be made relative to those other analyses.
Each frame is .08 seconds apart. Sarah Sjostrom recorded a time of 56.06, a new world record for the event. At this stage of the race, other swimmers are ahead of Sarah, particularly Jessica Schipper who eventually placed second, also swimming under the old world record. It was only in the last 15 m that Sarah Sjostrom swam "over the top" of Jessica Schipper to record the win. It is inferred that Sarah Sjostrom's technique displayed here is one that accompanies her well-planned appropriately paced race. It is a non-breathing stroke.