Yep, thats what they said when i took Physical therapy and collapsed into a chair with my entire body shaking after 100 paces lol(i was trying for 150 so i could get to my apartment from the car, didn't work .I can say that I've experienced all of those definitions at different points in the past 23 yrs.
Rapid Loss of Stamina perhaps RLOS could replace the term "fatigue" on this forum?