Introdução: A lombalgia induz a redução das atividades físicas e, consequentemente, da aptidão física. Objetivo: Verificar o efeito, isolado e associado, da classificação clínica da dor lombar (efeito de grupo) e do nível de incapacidade sobre a capacidade funcional obtida pela distância percorrida no teste de caminhada de seis minutos (TC6), sobre a força muscular dorsal e sobre a de membros inferiores (MMII). Métodos: A amostra foi composta por 31 sujeitos divididos em três grupos: controle (GC/n=10), lombares inespecífico (GLI/n=7) e específico (GLE/n=14). Os procedimentos avaliativos foram: (a) determinação do nível de incapacidade; (b) dinamometria dorsal e de MMII; (c) TC6. Resultados: Houve efeito principal do grupo, e o GC apresentou força significativamente maior que o GLE e o GLI, para a musculatura dorsal e de MMII; porém, não houve tal efeito para o TC6. Conclusão: A força muscular dorsal e a de MMII foram influenciadas pela lombalgia crônica; entretanto, o desempenho funcional, não.

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The authors investigated the effects of chronic low back pain (LBP) and walking speed (WS) on metabolic power and cost of transport (CT). Subjects with chronic nonspecific LBP (LBP group [LG]; n = 9) and healthy (control group [CG]; n = 9) were included. The test battery was divided into 3 blocks according to WS as follows: preferred self-selected speed (PS), and lower and higher than the PS. In each block, the volunteers walked 5 min, during which oxygen consumption was measured. Although without differences between groups, the LG had CT lower in slower speeds than in faster speeds. Walking speed affected CT only in the LG, which the group had the greatest walking economy at slower speeds.

BACKGROUND AND OBJECTIVES:Low back pain is a major musculoskeletal system problem and generates high costs for the health system. Regardless of etiology, chronic low back pain patients tend to decrease their physical activities routine, thus impairing fitness and mood. So, it is necessary to establish the relationship among variables involved in the etiology of low back pain, which are noxious for patients' performance. This study aimed at comparing the distance covered during a six-minute walk test (6MWT) and the following psychosocial variables: mood perception and level of disability between chronic low back pain and healthy individuals. METHOD:This was an observational transversal study with volunteers of both genders, sedentary, aged between 30 and 58 years, who were divided in control group (CG) and low back pain group (LG). Volunteers answered a battery of questionnaires, as follows: Oswestry Disability Index and Brunel Mood Scale to determine the level of disability and mood perception, respectively. Then, volunteers made the 6MWT. RESULTS:LG (25.44 ± 14.3%) had significantly higher levels of disability as compared to CG (1.25 ± 2.1%). It was also observed that LG had significantly higher levels of stress, fatigue and mental confusion as compared to CG.

BACKGROUND AND OBJECTIVES:Walking is described as one of the abilities most affected by chronic low back pain. This study aimed to determine if chronic nonspecific low back pain and walking speed affect the spatiotemporal parameters (stride length, swing time, contact time, stride time, stride frequency and walking ratio) and the coefficients of variation of stride length and contact time. METHODS: Ten participants with chronic nonspecific low back pain (low back pain -LG) and ten healthy participants in the control group (CG) walked on the treadmill at preferred self-selected speed, slower and faster than the preferred speed. Spatiotemporal parameters and coefficients of variation were determined by kinematic analysis. Main effects (group and speed) and their interactions were tested using generalized estimating equations method. RESULTS: Our results showed that there were no significant differences between groups or significant interaction between group and speed factors. There was a speed effect. Stride frequency and length increased while contact and stride time decreased as the speed increased. The walking ratio (stride length/stride frequency) Chronic low back pain and walking speed: effects on the spatiotemporal parameters and in gait variabilityDor lombar crônica e velocidade de caminhada: efeitos nos parâmetros espaço-temporais e na variabilidade da marcha