Exercise as it relates to Disease/The effects of aerobic and strength exercise programs for patients with Dementia

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This resource is a critique of a research paper that investigated the effects that aerobic and strength exercise programs had for patients with dementia. This resource has been written as an assessment for Health, Disease and Exercise, a unit at the University of Canberra.

The paper that has been critiqued is:

Bossers, W. J., Van Der Woude, L. H., Boersma, F., Hortobagyi, T., Scherder, E. J., & Van Heuvelen, M. J. (2016). Comparison of Effect of Two Exercise Programs on Activities of Daily Living in Individuals with Dementia: A 9-Week Randomized, Controlled Trial. The American Geriatrics Society , 64, 1258-1266.

What is the background to this research?[edit | edit source]

The cognitive and motor impairments associated with dementia can cause activity of daily living (ADL) disability[1]. ADL's are activities that individuals partake in as a part of their daily living routine that are necessary for self-care. There are 6 ADL's; walking, feeding, dressing and grooming, going to the bathroom, bathing and transferring [2]

A reduction in ADL leads to a loss of independence, poor quality of life, burden on carers and increased costs [3] [4]. Physical activity has been suggested as an intervention to combat these problems for dementia patients. Physical inactivity can accelerate ADL disability, and can increase an individual’s risk of motor and cognitive function decline [5][6][7]. Therefore, increasing physical activity levels could slow the decline in physical and cognitive function and ADL in dementia patients [8]. Previous research has provided evidence that multicomponent exercise programs can increase ADL in dementia patients[9]. Individuals in nursing homes living with dementia who participated in an aerobic and strength exercise program experienced more motor and cognitive improvements than the individuals who participated in a single-exercise program[10].

The hypothesis that exercise programs are beneficial for ADL's in patients with dementia is not a widely researched topic. Only 6 studies[9][11] [12][13][14][15]have investigated the topic, all having inconsistent results or data that lacked validity.

Researchers propose that combining strength and aerobic exercise can have a positive effect on levels of insulin like growth factor-1 and brain-derived neurotropic factors[10]. The authors aim of this study was to investigate their hypothesis that combining aerobic and strength exercise programs is more effective in increasing ADL levels in individuals with dementia than single-component programs, thus looking to improve exercise recommendations in this population.

Where is the research from?[edit | edit source]

This study was conducted in the Netherlands by researchers from the Centre for Human Movement Sciences, Centre for Rehabilitation, Department of General Practice, University Medical Centre Groningen, University of Groningen, and Department of Clinics Neuropsychology. All authors have conducted research in this field prior to the current study. The research was published in the American Geriatrics Society, a reputable peer-reviewed journal. There was no conflict of interest from any authors of this study.

What kind of research was this?[edit | edit source]

This study was a parallel, three-group, single blind, randomised, controlled trial. This research design was appropriate for the study. 105 individuals from the Netherlands participated in the study. All participants had dementia and were 65 years or older. This study had quite a small sample group, making it difficult to draw valid conclusions that can be applicable to a wider population, such as individuals with dementia.

What did the research involve?[edit | edit source]

The study involved a combined aerobic and strength exercise group, an aerobic-only group and a social visit group. Participants ADL’s were measured and assessed before and after the intervention. This is an important element that must be included in an intervention study so that accurate conclusions can be drawn.

Each intervention lasted 9 weeks, consisting of thirty-six half an hour session. The combined group participated in two walking sessions and two strength sessions per week, the aerobic group engaged in four walking sessions per week and the social control group participated in four social visits a week.

The Katz index, 7-item physical performance test and the Erlangen-ADL test were used to assess ADL’s before and after the 9-week interventions. The Katz index was measured from the nurse's perspective which may have been biased due to a lack of blinding, as the nurse administering the questionnaire is likely to have been familiar with the individual, their level of activity and daily routine. This may have impacted the results of the study.

What were the basic results?[edit | edit source]

The combined aerobic and strength intervention and the aerobic-only intervention resulted in improved ADL’s in a similar way, however the results were small. Therefore, the data in this research did not support the hypothesis that a combined exercise program would be more beneficial on ADL levels of individuals with dementia. Nonetheless, the results still showed the positive benefits of exercise programs independent of exercise type, on ADL levels for individuals with dementia.

The combined aerobic and strength group’s ADL measures improved significantly compared to the social group, although the aerobic group only saw significant improvements on some ADL measures in comparison to the social group.

This study revealed the benefits that exercise can have on the quality of life of patients living with dementia. However, there was no clear distinction in which form of exercise (aerobic or strength) is more beneficial for these individuals. Future studies are needed to investigate this further.

What conclusions can we take from this research?[edit | edit source]

Although the improvements are slight and are independent of the type of exercise physical exercise can improve ADL levels in individuals with dementia. However, additional examination from the researchers of this study suggest that a combined aerobic and strength program can be more effective than an aerobic-only program in terms of targeting ADL levels in patients with dementia.

In the current study, the combined exercise group experienced greater motor and cognitive function improvements than other groups. Further research needs to focus on confirming this exercise-specific finding. Future studies should also include more participants to enhance the certainty of the results in relation to others with dementia.

Practical Advice[edit | edit source]

  • Individuals who are physically inactive are at a higher risk of experiencing cognitive, motor and physical functional decline. It is recommended that individuals increase their level of physical activity by implementing an exercise program to slow this decline and therefore, allow individuals to maintain their quality of life longer.
  • This research has shown that aerobic and strength programs (exclusively and combined) have the same effect on ADL levels in individuals with dementia. Therefore, it can be suggested that any exercise, either strength or aerobic, will be beneficial for individuals with ADL disability.
  • It is important that prescribed exercise programs are suitable for the individual, and meet the individual's requirements.

Further Information/Resources[edit | edit source]

The following resources can be used to obtain further information regarding physical activity and dementia:

References[edit | edit source]

  1. Kang HS, Myung W, Na DL et al. Factors associated with caregiver burden in patients with Alzheimer’s disease. Psychiatry Investig 2014;11:152– 159.
  2. Kernisan, L. (2018). What are Activities of Daily Living (ADLs) & Instrumental Activities of Daily Living (IADLs)? Retrieved September 16th, 2018, from Better Health While Aging : https://betterhealthwhileaging.net/what-are-adls-and-iadls/
  3. Andersen CK, Wittrup-Jensen KU, Lolk A et al. Ability to perform activities of daily living is the main factor affecting quality of life in patients with dementia. Health Qual Life Outcomes 2004;2:52.
  4. World Health Organization. Dementia: A Public Health Priority. Geneva, Switzerland: WHO Press, World Health Organization, 2012.
  5. Sakurai T, Limuro S, Sakamaki K et al. Risk factors for a 6-year decline in physical disability and functional limitations among elderly people with type 2 diabetes in the Japanese elderly diabetes intervention trial. Geriatr Gerontol Int 2012;12:117–126.
  6. Lovden M, Xu W, Wang HX. Lifestyle change and the prevention of cognitive decline and dementia: What is the evidence? Curr Opin Psychiatry 2013;26:239–243.
  7. Nyberg J, Aberg MA, Schioler L et al. Cardiovascular and cognitive fitness at age 18 and risk of early-onset dementia. Brain 2014; 137:1514–1523.
  8. Blankevoort CG, van Heuvelen MJ, Boersma F et al. Review of effects of physical activity on strength, balance, mobility and ADL performance in elderly subjects with dementia. Dement Geriatr Cogn Disord 2010; 30:392–402.
  9. a b Rolland Y, Pillard F, Klapouszczak A et al. Exercise program for nursing home residents with Alzheimer’s disease: A 1-year randomized, controlled trial. J Am Geriatr Soc 2007; 55:158–165.
  10. a b Bossers WJ, van der Woude LH, Boersma F et al. A 9-week aerobic and strength training program improves cognitive and motor function in patients with dementia: A randomized, controlled trial. Am J Geriatr Phychitr 2015; 23:1106–1116.
  11. Santana-Sosa E, Barriopedro MI, Lopez-Mojares LM et al. Exercise training is beneficial for Alzheimer’s patients. Int J Sports Med 2008;29:845–850.
  12. Kwak YS, Um SY, Son TG et al. Effect of regular exercise on senile dementia patients. Int J Sports Med 2008;29:471–474.
  13. Venturelli M, Scarsini R, Schena F. Six-month walking program changes cognitive and ADL performance in patients with Alzheimer. Am J Alzheimers Dis Other Demen 2011;26:381–388.
  14. Aman E, Thomas DR. Supervised exercise to reduce agitation in severely cognitively impaired persons. J Am Med Dir Assoc 2009;10:271–276.
  15. Vreugdenhil A, Cannell J, Davies A et al. A community-based exercise programme to improve functional ability in people with Alzheimer’s disease: A randomized controlled trial. Scand J Caring Sci 2012;26:12–19.