Effect of order on the performance of maximal inspiratory and expiratory pressures

We studied the effect of order in the performance of maximal respiratory pressures (PImax and PEmax). For this purpose 20 healthy subjects (male/female: 1/1) were studied. PImax and PEmax were obtained on 2 different days at the same hours (9 and 12 a.m.). The test order was random. On the first day, the entire manoeuvre was performed twice, changing the order in the second determination. On the second day, we repeated the same exercises with reversed order. There were no differences between values for PImax and PEmax when we altered the order of manoeuvres on various days.