What Happens To Your Body & Blood When You Race Back-To-Back Spartan Races?

16 Feb 2015 · 19 min
19:05

Ben Greenfield describes his WellnessFX blood tests taken immediately before and ~3 days after competing in back-to-back Spartan races (Super on Saturday, Sprint on Sunday). He compares specific laboratory changes: modest decreases in total cholesterol (LDL and HDL), a rise in triglycerides (attributed to alcohol), doubling of inflammation (hs-CRP) though still low, increases in fasting glucose and insulin (likely dietary), little change in thyroid between tests but large improvement compared to his prior endurance-triathlete state, a small drop in morning cortisol, reduced IGF, rising estradiol with increasing total testosterone over time but high SHBG limiting free testosterone, elevated liver enzymes and creatinine consistent with muscle breakdown, a notable drop in iron/hemoglobin/red blood cell count after giving 16 vials of blood prior to racing, and a drop in vitamin D. He offers practical advice: don't give blood immediately before an important race, support liver recovery (glutathione/NAC/calcium D-glucarate, sulfurous foods), replenish iron/red-meat intake, consider aromatase inhibition for high estradiol, and be mindful that alcohol can raise triglycerides and post-race nutrition affects glucose/insulin.

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