I’ve been training almost exclusively indoors for the last year, and just raced last week. I felt fine during the race but after 90min both of my hamstrings cramped at the same time, and I had to stop for almost 5 minutes to get them to relax. I finished the race solo, but couldn’t push it much after the cramping as my hamstrings felt like they were getting ready to lock up again.
I think I cramped due to a bike fit issue, but want to get some advice in case I need to think about this differently. My FTP is 275, which puts me at about 4 w/kg, and my NP was about 225 after 90min when I cramped, so I don’t think it’s a fitness issue. I preloaded with salt the night before and prior to the race, and had two bottles of electrolyte mix I was drinking, so I don’t think it’s nutrition. The saddle on my race bike was a full inch rearward compared to the saddle on my trainer, so I think that resulted in me recruiting more hamstrings, which overloaded that muscle group causing the cramps. My hamstrings are also sore 2 days after the race (the DOMS kind of soreness) which makes me think I used my hamstrings much more during the race than on the trainer. I need to get a different seatpost on my race bike to adjust the saddle more forward, so I plan to do that which I’m hoping resolves the hamstring cramping issue. Does it seem logical the bike fit led to the cramping in my case?