My son has been struggling with unusual race fatigue here and there for almost a year now.
He is currently 16 and a sophomore. At age 12 and 13 he won the National AAU 1500 races in both Michigan and Iowa with times of 4:46 and 4:32. He also finished in the top 10 of a few of the XC races at that time.
In junior high he finished out his 8th grade year by winning the State JR. High XC race with a time of 10:24 (2 mile) In track he ran the fast recorded times in the mile in our state for that year in junior high at 4:30 and he ran a 2:04 in the 800.
Then all of a sudden during the first half of his XC season his freshman year if he went very hard at all he would blow up and barely be able to finish it seemed like. We checked for anemia (family doc only checked hemoglobin and said he was fine) and we took him off some oral acne medicine he was using. About a month later he had a race that he really improved on running mid 16:30's and then 2 weeks from the end of the season he ran 16:17 on a fast course but had other sub par efforts along the way.
He followed that up with an off track season. His first race he ran a 4:30 but tweaked a hamstring and took time off for precautionary reasons and only made it back to the 4:31-2 range by the end of the season sometimes feeling overly fatigued during races but I attributed that to his breaks in training.
One morning during his freshman year he went to workout and the workout was simple 800's at a pace he could run while asleep and he couldn't move. He said he felt like he was running in sand. We took him to an athletic nutritionist. She found him to be low in iron (feritan) was 29. Low in Vit D and borderline off on his TSH levels.
She prescribed a better diet and some supplements. As this fall approached he looks very athletic and in shape. He felt like his training was going ok but when it comes to racing he already has had 2 good performance finishing first on his team in whatever they were doing and 2 times where he finishes last out of his top 5 and he looked like he could barely get to the line to finish. He complains of having no energy on those days.
His feritan is up to a 40 and his Vit D is now normal but his TSH remains 2.3. I have read where 1.0 is preferable for distance running but the 2 endo's I spoke with say his 2.3 is dead smack in the middle of the .5 - 6.0 range they use and won't discuss it further.
It has been tough on a 2 time national champion with legit times to feel like he is running in a sand pit and finish middle of the pack. We are at a loss at this point and could use any advise anyone may have found helpful for themselves.
An extra tidbit. We asked and pursued burnout but he claims that isn't it at all. He keeps a detailed running log, used his own money to update his garmin watch just last week and always runs on his own without anyone telling him he has to go run.