The crew also participated in the Integrated Resistance and Aerobic Training Study-Sprint, which evaluates the use of high-intensity, low-volume exercise training to minimize loss of muscle, bone and cardiovascular functions during long-duration missions. The expedition also managed a number of visits by international and commercial spacecraft, including the first contracted commercial resupply flight by SpaceX, and conducted several challenging spacewalks to sustain the productive operation of the orbiting complex.
Williams, Hoshide and Malenchenko orbited Earth 2,032 times and traveled 54,090,628 miles. Williams, who has spent 322 days in space on two missions, now ranks sixth on the all-time U.S. endurance list, and second all-time for a female. Malenchenko has spent 642 days in space on his five flights, which ranks him seventh on the all-time endurance list. During their mission, Williams and Hoshide performed three spacewalks to replace a component that relays power from the space station's solar arrays to its systems and repair an ammonia leak on a station radiator. With 50 hours and 40 minutes, Williams holds the record for total cumulative spacewalk time by a female astronaut. Hoshide holds the record for total cumulative spacewalk time by a JAXA astronaut at 21 hours and 23 minutes.
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