Abstract

Dual-tasking can lead to falls, as does a deterioration of obstacle avoidance (OA) skills. Hence, it is expected that a combination of both would be even more detrimental, especially when OA is time-critical. Previous studies confirmed this expectation, however, due to several limitations in their design it is yet too early to draw any definitive conclusions on the allocation of attentional resources in OA under dual-task conditions. Therefore, attentionally demanding primary and secondary tasks were used with the instruction to perform as well as possible on both tasks. Nineteen healthy senior individuals (60±4.7 years, 8 females) performed an OA task on a treadmill while walking at 3 km/h as a single task and combined with an auditory Stroop task. Biceps femoris (BF) muscle response times, OA failure rates and composite scores were used to evaluate the data. Increased OA failure rates (3%, p=0.03) and delayed BF response times (21 ms, p<0.001) were found under dual-task conditions. Composite scores were reduced during (p<0.001) and just after obstacle crossing (p=0.003). In conclusion, dual-tasking during time-critical OA affects the motor as well as the cognitive task when subjects are instructed to keep up performance on both tasks. This adds to the evidence indicating an increased risk of tripping or falling when attention is divided during walking in the presence of unexpected obstacles.

Links

Publisher Full Text

Authors

Hegeman J, Weerdesteyn V, van den Bemt B, Nienhuis B, van Limbeek J, Duysens J

Institution

Department of Research, Development & Education, Sint Maartenskliniek, Nijmegen, The Netherlands. judith.hegeman@gmail.com

Source

Gait & posture 36:2 2012 Jun pg 236-40

MeSH

Accidental Falls
Acoustic Stimulation
Attention
Electromyography
Female
Humans
Lower Extremity
Male
Middle Aged
Muscle, Skeletal
Psychomotor Performance
Stroop Test
Walking

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22565318