(a) The mean rate of ATP (mmol min−1) production from NEFA oxidation (ATPNEFA) during 6 h of rest following administration of Gx or P at 0 h. The upper inset panel shows the mean (−s.d.) within-subject difference due to treatment at each of the time points. Half-hourly values have been omitted for reasons of clarity. (b) Mean total ATPNEFA (mol) produced by the end of each hour. The mean difference (−s.d.) between treatments in total ATPNEFA is shown in the lower inset panel. Half-hourly values are again not shown, although half-hourly rates were used when calculating the total produced by the end of each hour.