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Comparative Study
. 2015 Apr;70(4):487-94.
doi: 10.1093/gerona/glu146. Epub 2014 Sep 4.

Walking energetics, fatigability, and fatigue in older adults: the study of energy and aging pilot

Catherine A Richardson  1 , Nancy W Glynn  2 , Luigi G Ferrucci  3 , Dawn C Mackey  4
Affiliations
Comparative Study

Walking energetics, fatigability, and fatigue in older adults: the study of energy and aging pilot

Catherine A Richardson et al. J Gerontol A Biol Sci Med Sci. 2015 Apr.

Abstract

Background: Slow gait speed increases morbidity and mortality in older adults. We examined how preferred gait speed is associated with energetic requirements of walking, fatigability, and fatigue.

Methods: Older adults (n = 36, 70-89 years) were categorized as slow or fast walkers based on median 400-m gait speed. We measured VO2peak by graded treadmill exercise test and VO2 during 5-minute treadmill walking tests at standard (0.72 m/s) and preferred gait speeds. Fatigability was assessed with the Situational Fatigue Scale and the Borg rating of perceived exertion at the end of walking tests. Fatigue was assessed by questionnaire.

Results: Preferred gait speed over 400 m (range: 0.75-1.58 m/s) averaged 1.34 m/s for fast walkers versus 1.05 m/s for slow walkers (p < .001). VO2peak was 26% lower (18.5 vs 25.1ml/kg/min, p = .001) in slow walkers than fast walkers. To walk at 0.72 m/s, slow walkers used a larger percentage of VO2peak (59% vs 42%, p < .001). To walk at preferred gait speed, slow walkers used more energy per unit distance (0.211 vs 0.186ml/kg/m, p = .047). Slow walkers reported higher rating of perceived exertion during walking and greater overall fatigability on the Situational Fatigue Scale, but no differences in fatigue.

Conclusions: Slow walking was associated with reduced aerobic capacity, greater energetic cost of walking, and greater fatigability. Interventions to improve aerobic capacity or decrease energetic cost of walking may prevent slowing of gait speed and promote mobility in older adults.

Keywords: Energetics.; Epidemiology; Fatigue; Gait speed; Mobility.

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Figures

Figure 1.
Figure 1.
Associations between preferred 400-m gait speed, walking energetics, and fatigability. Regression lines are shown as dashed lines.
See this image and copyright information in PMC

References

    1. Fuller-Thomson E, Yu B, Nuru-Jeter A, Guralnik JM, Minkler M. Basic ADL disability and functional limitation rates among older AMERICANS from 2000-2005: the end of the decline? J Gerontol A Biol Sci Med Sci. 2009;64:1333–1336. - PMC - PubMed
    1. Shumway-Cook A, Ciol MA, Yorkston KM, Hoffman JM, Chan L. Mobility limitations in the Medicare population: prevalence and sociodemographic and clinical correlates. J Am Geriatr Soc. 2005;53:1217–1221. - PubMed
    1. Simonsick EM, Newman AB, Visser M, et al. ; Health, Aging and Body Composition Study. Mobility limitation in self-described well-functioning older adults: importance of endurance walk testing. J Gerontol A Biol Sci Med Sci. 2008;63:841–847. - PMC - PubMed
    1. Colley RC, Garriguet D, Janssen I, Craig CL, Clarke J, Tremblay MS. Physical activity of Canadian adults: accelerometer results from the 2007 to 2009 Canadian Health Measures Survey. Health Rep. 2011;22:7–14. - PubMed
    1. Guralnik JM, Ferrucci L, Simonsick EM, Salive ME, Wallace RB. Lower-extremity function in persons over the age of 70 years as a predictor of subsequent disability. N Engl J Med. 1995;332:556–561. - PMC - PubMed

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