This field study of simulated urban combat explored the array of issues associated with the collection and use of real-time physiologic data. Six male soldiers (age = 22 +/- 4 y MEAN +/- SD; ht = 172 +/- 5 cm wt = 69.3 +/- 1.6 kg; % body fat = 13.9 +/- 6.9 load carried = 19.0 +/- 2.9 kg) were monitored in real-time during a simulated attack on the ...