Association Between Greater Cerebellar Network Connectivity and Improved Phonemic Fluency Performance After Exercise Training in Older Adults

Abstract

Little is known about the effects of exercise training (ET) on lexical characteristics during fluency task and its association with cerebellum functional connectivity. The purposes of this study were (1) to investigate whether ET alters response patterns during phonemic and semantic fluency tasks and (2) to assess the association between ET-related changes in cerebellum functional connectivity (FC) and lexical characteristics during fluency tasks. Thirty-five older adults (78.0 ± 7.1 years; 17 mild cognitive impairment (MCI) and 18 healthy cognition (HC)) underwent a 12-week treadmill ET. Before and after ET, cardiorespiratory fitness tests, phonemic and semantic fluency tests, and resting-state fMRI scans were administered. We utilized a seed-based correlation analysis to measure cerebellum FC and linear regression to assess the association of residualized ET-induced Δcerebellum FC with Δtask performance. Improved mean switches and frequency during the phonemic fluency task were observed following ET in all participants. There were significant associations between ET-induced increases in cerebellum FC and greater phonemic fluency task log frequency, increases in mean switches, and a reduction in the number of syllables in HC. Lastly, there was a significant interaction between group and cerebellar connectivity on phonemic fluency mean log frequency and number of syllables. A 12-week walking ET is related to enhanced phonemic fluency lexical characteristics in older adults with MCI and HC. The association between ET-induced increases in cerebellum FC and enhanced response patterns after ET suggests that the cerebellum may play an important role in ET-related improvement in phonemic fluency performance in cognitively healthy older adults.

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Acknowledgments

We thank the participants for their dedication while participating in this study and Drs. Nathan Hantke and Alissa Butts for their assistance with participant assessment. This study was supported by the University of Wisconsin-Milwaukee Graduate School Research Growth Initiative and the National Center for Advancing Translational Sciences, NIH grant numbers 8UL1TR000055 and 8KL2TR000056. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH.

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J.W. and J.C.S. developed the study idea. J.C.S. and K.N. developed overall study protocol and collected data. J.W. processed and analyzed imaging data. A.W., A.A., D.C., and Y.F-S. analyzed phonemic and semantic fluency data. J.W., J.C.S, K.N., and Y.F-S. interpreted the data. J.W. and J.C.S. collectively developed the analytic strategy. J.W. drafted the paper and J.W., J.C.S, K.N., Y.F-S., A.W., and D.C. edited the paper. J.W. created the figures. All authors reviewed, revised, and approved the final manuscript.

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Correspondence to J. Carson Smith.

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Won, J., Faroqi-Shah, Y., Callow, D.D. et al. Association Between Greater Cerebellar Network Connectivity and Improved Phonemic Fluency Performance After Exercise Training in Older Adults. Cerebellum (2021). https://doi.org/10.1007/s12311-020-01218-3

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Keywords

  • Aging
  • Exercise training
  • Functional connectivity
  • Cerebellum
  • MCI
  • Phonemic fluency