In a 10 km race, the effort becomes progressively and inexorably more difficult as the race continues, without the benefit of a miraculous "second wind" to alleviate the strain.

noli's read

Running Addict's analysis of the perception of effort is consistent with high-intensity exercise physiology. Research in exercise physiology, notably work on the "psychobiological model" (Marcora et al., literature review), confirms that perceived exertion increases linearly with duration and intensity, especially as one approaches the limit of tolerance. Contrary to popular belief, the "second wind" phenomenon is not a physiological mechanism that cancels out fatigue, but rather a temporary adaptation of respiration and circulation following the first few minutes of effort (cardiorespiratory adjustment). The mid-race segment (km 4-6) is indeed described in observational studies as a critical zone of "psychological doubt" where the brain evaluates the remaining distance relative to the discomfort experienced. The creator correctly points out that the difficulty is as much mental as it is physical, because maintaining the target pace requires increasing muscle recruitment to compensate for neuromuscular fatigue. There is no exaggeration here, but rather a realistic description of managing sustained maximal effort.

the sources

No named source held this one up — that absence is part of the verdict.