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正

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To elucidate the adaptation of respiratory sensation to added breathingresistance

changes of ventilation

breathing pattern

and perceived magnitude（PM）of respiratory sensation were observed in 11 healthy young male subjectswith inspiratory resistive loadings for 40

30

and 20 rain at rest and in light (200kg.m.rain

-1

)

and moderate(600 kg.m.rain

-1

)physical activities respectively.Themain results are as follows:（1）With inspiratory load lasting 30 and 20 rain inlight and moderate physical activities respeetively

VI

max

VI

f

MV

Plmax.andWI increased

and TI and VTI decreased;but PETco

2

decreased apparently only atmoderate work rate due to the accompanying hyperventilation.（2）Adaptation ofrespiratory sensation occurs

if the intensity of the added inspiratory load does notexceed the“moderate”degree and for the physical load is lower than the“light”degree.