The "Ironman" is a version of the triathlon, a race that includes three events: swimming, bicycling, and running. In an Ironman, an athlete must swim 2.4 miles, bike 112 miles, and run 26.2 miles, in that order, without a break. The annual Ironman World Championship is held in Hawaii every year. The men's course record was set in 2011 by Australia's Craig Alexander with a time of 8 hours, 18 minutes, and 37 seconds, and the women's course record was set in 2009 by England's Chrissie Wellington with a time of 8 hours, 54 minutes, and 2 seconds.
-What type of energy would the leg muscles of athletes that enter this race use during the final 26.2-mile foot race?
A) stored ATP and PCr
B) aerobic respiration
C) stored ATP and PCr plus lactic acid fermentation
D) lactic acid fermentation

Question

Quizplus · Accepted Answer

The leg muscles of athletes that enter this race would primarily utilize aerobic respiration during the final 26.2-mile foot race. This is because aerobic respiration is the most efficient way to generate ATP for prolonged exercise, and the foot race is the longest part of the Ironman race.

The "Ironman" Is a Version of the Triathlon, a Race