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Background

Age-related balance impairments, particularly in mediolateral direction ML may cause falls. Sufficiently sensitive and reliable ML balance tests are, however, lacking. This study is aimed to determine 1 the effect of age on and 2 the reliability of ML balance performance using Center of Mass CoM tracking.

Methods

Balance performance of 19 young 26±3 years and 19 older 72±5 years adults on ML-CoM tracking tasks was compared. Subjects tracked predictable and unpredictable target displacements at increasing frequencies with their CoM by shifting their weight sideward. Phase-shift response delay and gain amplitude difference between the CoM and target in the frequency domain were used to quantify performance. Thirteen older and all young adults were reassessed to determine reliability of balance performance measures. In addition, all older adults performed a series of clinical balance tests and conventional posturography was done in a sub-sample.

Results

Phase-shift and gain dropped below pre-determined thresholds −90 degrees and 0.5 at lower frequencies in the older adults and were even lower below these frequencies than in young adults. Performance measures showed good to excellent reliability in both groups. All clinical scores were close to the maximum and no age effect was found using posturography. ML balance performance measures exhibited small but systematic between-session differences indicative of learning.

Conclusions

The ability to accurately perform ML-CoM tracking deteriorates with age. ML-CoM tracking tasks form a reliable tool to assess ML balance in young and older adults and are more sensitive to age-related impairment than posturography and clinical tests.



Autor: L. Eduardo Cofré Lizama, Mirjam Pijnappels, Gert H. Faber, Peter N. Reeves, Sabine M. Verschueren, Jaap H. van Dieën

Fuente: http://plos.srce.hr/



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