| Summary: | Background
Good pulmonary function (PF) is associated with preservation of cognitive performance, primarily of executive functions, in aging (Albert et al., 1995; Chyou et al., 1996; Emery, Finkel, & Pedersen, 2012; Yohannes & Gindo, 2013). The contribution of PF to older adults’ language abilities, however, has never been explored, to our knowledge. We addressed this gap by examining the effects of PF on older adults’ language functions, as measured by naming and sentence processing accuracy. We predicted similar effects as found for executive functions, given the positive associations between executive functions and sentence processing in aging (e.g., Goral et al., 2011).
Methods
Data were collected from 190 healthy adults aged 55 to 84 years (M = 71.1, SD = 8.1), with no history of neurological or psychiatric disorders.
Procedure
PF was measured prior to language testing. Measures included forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC). Language functions were assessed through performance on computer-administered lexical retrieval and sentence processing tasks. Sentence processing was measured using two auditory comprehension tasks: one, of embedded sentences (ES), the other, of sentences with multiple negatives (MN). Lexical retrieval was measured using the Boston Naming Test (BNT) and Action Naming Test (ANT). Performance was scored for percent accuracy. Additionally, lexical retrieval was evaluated with a phonemic fluency task (FAS), which also taps executive function abilities.
Statistical Analyses
Multiple regression was used to examine the association between pulmonary and language functions, adjusting for age, education, gender, history of respiratory illness, current level of physical activities, and current and past smoking.
Results
Better PF was associated with better sentence processing and lexical retrieval on naming tasks, but not with phonemic fluency, after adjusting for covariates. Higher FVC was associated with better ES performance (B = 6.64, SE = 2.43, p = .01). Higher FVC and FEV1 were related to better MN performance, but this did not reach statistical significance (FVC: B = 3.68, SE = 2.16, p = .09; FEV1: B = 4.92, SE = 2.64, p = .06). Higher FVC (B = 3.98, SE = 1.44, p = .01) and FEV1 (B = 4.79, SE = 1.75, p = .01) were associated with better ANT performance. The positive association between PF and BNT performance was marginally significant (FVC: B = 4.19, SE = 2.18, p = .06; FEV1: B = 3.51, SE = 2.66, p = .10).
Discussion and Conclusion
Better PF was associated with higher accuracy on sentence processing and naming-based lexical retrieval tasks, consistent with the conclusion that pulmonary function affects older adults’ language performance. Our findings support the emerging thesis that language changes in aging are influenced by health-related physiological and neural mechanisms (e.g., Albert et al., 2009; Cahana-Amitay et al., 2013). From a clinical perspective, these findings highlight the promise of targeting PF as an intervention for improving language abilities among the elderly.
|
|---|
