[Variability of respiratory function variables in healthy aged men].
We studied six healthy young males (young group; mean age 30.0 +/- SD 1.8 years, FVC 4.5 +/- 80.45 l and FEV1.0/FVC 87.6 +/- 4.3%), and five aged healthy males (aged group; age 63.8 +/- 3.0 years, FVC 3.40 +/- 0.22 l and FEV1.0/FVC 75.9 +/- 3.2%) to evaluate the variability of pulmonary function. We measured flow-volume curves, closing volumes, functional residual capacities (FRC) and airway resistances (Raw) five times in different days in each person. The coefficients of variation in FVC and FEV1.0 in both groups were less than 5%, and there were no significant differences in these coefficients between the two groups. Although the coefficients in FEV1.0/FVC in both group were less than 5%, there was a significant difference between the two groups. The coefficients in flow at 50% FVC (V50), maximal midexpiratory flow (MMF) and peak expiratory flow rate (PEFR) in the aged group were significantly larger than those in the young group. The coefficients in closing volume, FRC, Raw and specific airway conductance (SGaw) using body plethysmography exceeded 10% in both groups, and the coefficients in Raw and SGaw in the aged group were significantly larger than those in the young group. These results suggest that aging worsens the variabilities of respiratory function in FEV1.0/FVC, MMF, V50, Raw and SGaw.
Dosaka
K
K
Kishi
F
F
Akiyama
Y
Y
Kamada
A
A
Inaba
S
S
Suzuki
A
A
Tashiro
N
N
Nishimura
M
M
Kawakami
Y
Y
D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012119:Respiration; D012129:Respiratory Function Tests