The phrase "fatigue factor" refers to the feeling of being extremely tired or exhausted. It represents the impact or influence that fatigue has on a person's physical or mental abilities. Full definition
Investigated different design options of engine 1V CEM Package for track type tractor four structures on cylinder head to keep the slip, bolt stresses, fatigue factor under the limits. (jobhero.com)
It is not just the players missing either, as a long injury list forces the manager to play the fit players until the fatigue factor starts to kick in and that has appeared to be an issue over the last week, so will Arsenal see yet another title challenge falter because of the maddeningly ever present injury crisis? (justarsenal.com)