1 Technische Universität Berlin, Chair of Biopsychology and Neuroergonomics, Berlin, Germany. anna.wunderlich@tu-berlin.de.
2 Faculty of Psychology and Human Movement Science, Institute for Human Movement Science, Universität Hamburg, Hamburg, Germany.
3 Neuroscience Research Australia (NeuRA) Falls, Balance and Injury Research Centre, Sydney, NSW, Australia.
4 Population Health, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia.
5 Department of Psychology, Concordia University, Montreal, Canada.

Background: Hearing impairments are a rising burden in our aging society. Hearing loss is associated with reduced cognitive performance as well as decrements in balance and gait. Therefore, impaired hearing affects also dual tasking (DT). The aim of this review is to summarize the evidence for DT performance decrements of older adults with hearing impairments during maintaining balance or walking.

Methods: The systematic literature research according to PRISMA guidelines was conducted using MEDLINE, APA Psych-Info, and Web of Science. Inclusion criteria were: Independent living older people = 60 years with hearing impairments, use of a DT paradigm to test hearing impaired older adults within a balance or walking condition.

Results: N = 57 studies were found within the databases. Eight studies were included (N = 456 participants (58% women), including n = 200 older hearing-impaired persons with different levels of hearing loss). Most of the included studies oriented their inclusion criteria for hearing-impairments at thresholds for mild hearing loss with Pure Tone Average (0.5-4 kHz) = 25 and < 40 dB. Three of the studies focused on DT balance performance and five used DT walking comparing participants with and without hearing loss. For DT balance and gait performance, higher decrements for the hearing-impaired group were observed compared to healthy older adults. Performance decrements were accompanied by reduced compensatory strategies in balance performance.

Conclusion: More pronounced decrements in DT performance were observed for participants with hearing impairments compared to those without. This implies that hearing-impaired older adults might need specific interventions to reduce the cognitive-motor interference (CMI) to maintain balance control or walking stability in daily situations that require managing of cognitive and motor tasks simultaneously. However, taking all results into account the underlying mechanisms of CMI for this target group needs to be further examined.

Trial registration: This review was registered at Prospero with the ID CRD42022340232.