I'd like to see a follow-up to see how it's correlated to nutrition strategies pre and post race. The only info we have is that the subjects (n=4) were male and "well trained"[1], nothing I could find about their weight or body composition, or even how hard they ran their marathons!

[1] in the studies I've seen "well trained" usually means a VO2 max >= 70 ml/kg/min but that would be quite a feat for the oldest participant at 75!