Impact of resistance exercise program on functional capacity and muscular strength of knee extensor in pre-frail community-dwelling older women: a randomized crossover trialEfeito de um programa de resistência muscular na capacidade funcional e na força muscular dos extensores do joelho em idosas pré-frágeis da comunidade: ensaio clínico aleatorizado do tipo crossover AbstractBackground: Frailty syndrome in elderly people is characterized by a reduction of energy reserves and also by a decreased of resistance to stressors, resulting in an increase of vulnerability. Objective: The aim of this study was to verify the effect of a muscle-strengthening program with load in pre-frail elder women with regards to the functional capacity, knee extensor muscle strength and their correlation.Methods: Thrity-two pre-frail community-dwelling women participated in this study. Potential participants with cognitive impairment (MEEM), lower extremities orthopedic surgery, fractures, inability to walk unaided, neurological diseases, acute inflammatory disease, tumor growth, regular physical activity and current use of immunomodulators were excluded. All partcipants were evaluated by a
RESUMO: O objetivo deste estudo foi avaliar o efeito de seis diferentes tarefas duplas no desempenho funcional de idosos da comunidade. Em 35 idosos com idade média de 69,6±7,1 anos foi aplicado o teste de levantar e caminhar cronometrado (TLCC, Timed up and go ou TUG) simples (TLCCS) e associado a duas tarefas motoras -carregar um copo com água (TLCCM1) e transferir moedas de um bolso para o outro (TLCCM2) -e duas cognitivas, repetir uma frase (TLCCC1) e falar os dias da semana em ordem inversa (TLCCC2), sendo aferidos os acertos e erros nessas tarefas. Houve piora significativa da média do tempo em segundos no TLCC nas tarefas duplas, independente da tarefa, e correlação significativa, de moderada (r=0,676) a quase perfeita (r=0,953), entre os tempos de cada tipo de TLCC. O número de moedas transferidas no TLCCM2 e o número de dias na semana dito em ordem inversa no TLCCC2 apresentaram correlação com o tempo gasto para realizar todas as outras tarefas. Essas duas tarefas foram as que mais afetaram o tempo do TLCC (p<0,001). Os idosos estudados apresentaram pois pior desempenho no TLCC associado à realização de tarefas duplas. As tarefas com pior desempenho funcional verificados foram os de passar moedas de um bolso para outro e falar os dias da semana em ordem inversa. A complexidade da tarefa foi mais importante que sua natureza motora ou cognitiva. DESCRITORES: Análise e desempenho de tarefas; Atividade motora; Idoso; Manifestações neurocomportamentais ABSTRACT:The purpose was to assess the effect of six different dual tasks in community dwelling elderly. Thirty-five volunteers (aged 69.6±7.1 years) were submitted to the Timed Up and Go test (TUG) and to further five tasks wherein TUG was associated to two motor tasks -carrying a glass of water (TUGM1) and transferring coins from one pocket to another (TUGM2); to two cognitive tasks -repeating a sentence (TUGC1) and saying weekdays backwards (TUGC2); and to a motor-cognitive task, of carrying a glass of water while repeating a sentence (TUGMC). Time spent, failure and success in each task were counted. Results showed a significant decrease in average time (in seconds) spent in TUG when associated with all tasks; and a significant correlation from moderate (r=0.676) to almost perfect (r=0.953) between the times of each association with TUG. The number of transferred coins in TUGM2 and the number of days of the week correctly said in TUGC2 showed a correlation with the time spent in all the other tasks. These two tasks most affected the time spent to accomplish TUG (p<0.001). Hence, dwelling community elderly showed a decrease in performance at all dual tasks associated to TUG. The worst functional performances were transferring coins from one pocket to another and saying weekdays backwards, showing that task complexity, rather than task nature, had greater impact on the time spent to perform TUG.
RESUMO: Programas de treino funcional podem colaborar na redução de incapacidades, quedas, problemas emocionais e sociais em idosos. O objetivo do estudo foi verificar o efeito de um programa de oito semanas de exercícios funcionais em idosas da comunidade, avaliando o impacto nas atividades instrumentais de vida diária (AIVD) e no equilíbrio unipodálico. Deste estudo quasi-experimental participaram sete idosas da comunidade (71±8,1 anos), sem distinção de raça e/ ou condição social, excluindo-se aquelas com alterações cognitivas, doenças agudizadas ou neurológicas, quadro álgico na coluna ou articulações, labirintite, distúrbios visuais não-compensados, fratura prévia no último ano e utilização de apoio para a marcha. Todas responderam ao questionário de Lawton e se submeteram ao teste de apoio unipodálico antes e depois do programa, administrado três vezes por semana. O programa consistia em exercícios de marcha em flexão plantar, dorsiflexão, permanência em alternância de apoio unipodálico, marcha lateral com flexão de quadril aumentada e marcha tandem. Os resultados indicam melhora (p=0,042) no nível funcional (índice de Lawton) após o programa e uma tendência à melhora no equilíbrio unipodálico, embora não-significante (p>0,105). O programa de exercícios proposto produziu pois melhora no desempenho das AIVD e uma tendência à melhora do equilíbrio estático, sugerindo ser relevante para aprimorar a autonomia das idosas. DESCRITORES: Atividades cotidianas; Idoso; Equilíbrio postural; Mulheres; Terapia por exercício ABSTRACT: Functional training programs may help reduce elderly disabilities, falls, and emotional and social problems. The aim of this study was to assess the impact of an eight-week functional exercise program on aged women's instrumental activities of daily living (IADL) and one-foot stance balance. Irrespective of race and/or social condition, 7 community-dwelling elderly women (aged 71±8.1) were selected, being excluded those with cognitive impairment, acute or neurological diseases, spine or joint pain, labyrinth inflammatory disease, visual impairment, fractures in the previous year, and use of gait aid. All subjects were assessed by the Lawton IADL scale and the one-foot stance balance test, before and after the program. Exercises were performed three times a week and consisted of gait exercises in plantar flexion, dorsiflexion, alternation of sustained one-foot stance, sideways gait, gait with increased hip flexion, and tandem gait. Results show a functional improvement in IADL (p=0.042) as measured by the Lawton scale, and a trend towards better static one-foot stance balance, though not significant (p>0.105). The proposed program of functional exercises may thus be said to bring about improvement in older women's functional performance and a trend towards improvement on static balance, suggesting its relevance to increase elderly women's autonomy.
BackgroundWith the increase in the elderly population, a growing number of chronic degenerative diseases and a greater dependency on caregivers have been observed. Elderly persons in states of frailty remain more susceptible to significant health complications. There is evidence of an inverse relationship between plasma levels of inflammatory mediators and levels of functionality and muscle strength, suggesting that muscle-strengthening measures can aid in inflammatory conditions. The purpose of this study will be verified the effect of a muscle-strengthening program with load during a ten-week period in pre-frail elderly women with attention to the following outcomes: (1) plasma levels of interleukin-6 (IL-6) and tumor necrosis factor alpha (TNF-α), (2) functional capacity and (3) knee extensor muscle strength.Methods/DesignThe study design is a randomized crossover clinical trial evaluating 26 elderly women (regardless of their race and/or social condition) who are community residents, older than 65, and classified as pre-frail according to the criteria previously described by Fried et al. (2004). All subjects will be assessed using the Timed up and go and 10-Meter Walk Test functional tests. The plasma levels of IL-6 and TNF-α will be assessed by ELISA (enzyme-linked immunosorbent assay) with high sensitivity kits (Quantikine®HS, R&D Systems Minneapolis, MN, U.S.). Knee extensor muscle strength will be assessed using the Byodex System 3 Pro® isokinetic dynamometer at angular speeds of 60 and 180°/s. The intervention will consist of strengthening exercises of the lower extremities at 50 to 70% of 1RM (maximal resistance) three times per week for ten weeks. The volunteers will be randomized into two groups: group E, the intervention group, and group C, the control group that did not initiate any new activities during the initial study period (ten weeks). After the initial period, group C will begin the intervention and group E will maintain everyday activities without exercising. At the end of the total study period, all volunteers will be reassessed.DiscussionTo demonstrate and discuss possible influences of load-bearing exercises on the modification of plasma levels of IL-6 and TNF-α and in the functional performance of pre-frail elderly women.Trial RegistrationISRCTN62824599
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