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Dynamic visual acuity (DVA) during locomotion for targets at near and far distances: effects of aging, walking speed and head-trunk coupling.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Deshpande, Nandini Tourtillott, Brandon Michael Peters, Brian T. Bloomberg, Jacob J. |
| Copyright Year | 2013 |
| Abstract | This study examined effects of aging, head-trunk coupling (HTcoupling) and walking speed on dynamic visual acuity (DVA) at near and far viewing distances. Ten healthy participants were recruited in 3 groups; young: 20-33 years, Older1: 65-74 years, Older2: 75-85 years. The binocular DVA was measured while walking on a treadmill at 0.75 and 1.5 m/s speeds. The optotype display was placed at 0.5 m for NearDVA and at 3.0 m for FarDVA. On randomly selected trials, HTcoupling was achieved by using a collar. A mix-factor ANOVA (age-group x HTcoupling x speed) was performed separately for the Near and FarDVA. NearDVA declined with HTcoupling (p=0.021). Additionally, NearDVA worsened at the faster speed (p< 0.001). At 1.5 m/s speed the differences between Young and Older2 groups were significant (p=0.012) and those between Older1 and Older2 were marginal (p=0.085). FarDVA declined at the faster speed (p< 0.001) with no effect of HTcoupling or age-group. NearDVA is more sensitive to normal aging process. These age-related deficits become more apparent at higher walking speeds. Effect of HTcoupling on NearDVA suggests a possible additive effect of insufficient dampening of the vertical movement of the overall head-trunk complex and inability of the linear vestibulo-ocular reflex to compensate for the consequent high discrepancy. |
| Starting Page | 195 |
| Ending Page | 201 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.3233/VES-130500 |
| PubMed reference number | 24284599 |
| Journal | Medline |
| Volume Number | 23 |
| Issue Number | 4-5 |
| Alternate Webpage(s) | http://www.jvr-web.org/images/JVR23-4-5Deshpande.pdf |
| Alternate Webpage(s) | https://doi.org/10.3233/VES-130500 |
| Journal | Journal of vestibular research : equilibrium & orientation |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
