Which option lists factors affecting fatigue as given in the material?

• A. VO2 max, anaerobic threshold, specificity, FITT
• B. Fuel, time, electrolytes, fluid, DOMS, OBLA
• C. Fatigue only depends on psychological factors
• D. The weather and temperature only

Answer: (B)

Fatigue during exercise comes from several interacting factors, not just one cause. The factors listed—fuel, time, electrolytes, fluid, DOMS, and OBLA—cover the main ways fatigue can develop: fuel refers to energy availability and stores in the body; time reflects the duration of activity; electrolytes and fluids relate to hydration and chemical balance important for nerve and muscle function; DOMS represents muscle soreness from prior or intense activity that can reduce force production; and OBLA marks the point where lactate buildup accelerates, leading to acidosis and a drop in performance. The other options either focus on training principles or on factors that don’t broadly describe fatigue per the material (for example, psychology alone or weather alone).