Category: Geriatric Rehabilitation; Clinical Practice (assessment, diagnosis, treatment, knowledge translation/EBP, implementation science, program development); Measurement
Objective : To compare the trunk muscle activity during one-legged balance task between younger and older adults with and without chronic low back pain (CLBP).
Design : A case control study.
Setting : Biomechanics laboratory at the University
Participants (or Animals, Specimens, Cadavers) :
Twenty (20) with, and 20 subjects without nonspecific CLBP participated in the study. Each group was comprised of 10 younger (50% males; mean age: 31 years) and 10 older adults (50% males; mean age: 71 years).
Main Outcome Measure(s) :
Subjects performed 3×30-second trials of one-legged stance, with eyes open, on a force platform, while surface electromyography (EMG) measurements were obtained bilaterally on the multifidus at L5, iliocostalis lumborum at L3, rectus abdominis and biceps femoris muscles.EMG amplitude analysis was processed by the Root Mean Square (250 ms window epochs) and normalized by the peak of activation during the balance tasks, to determine the muscular activity of each muscle.
Participants with CLBP presented 15% lower lumbar muscle activation (p < 0.05), and 23% higher coactivation (ratio between rectus adominis by multifidus) than participants without CLBP, regardless of age. Significant differences (p < 0.05) between older and young groups were observed only for lower lumbar muscles (mean 24% lower in older than younger adults) and rectus adominis muscles (mean 17% lower in older
than younger adults).
CLBP individuals have different trunk muscle activity than those without CLBP, and older adults exhibit lower trunk activation during one-legged stance balance task. The use of the EMG in evaluation of trunk neuromuscular function during one-legged stance may thus be a valuable tool when assessing balance in CLBP
and older people.
Rubens da Silva– Professor, Université du Québec à Chicoutimi (UQAC), Saguenay, Quebec
Edgar Vieira– Associate Professor, Florida International University, Miami, Florida
Guillaume Léonard– Professor, Université de Sherbooke, Sherbooke, Quebec
Louis-David Beaulieu– Assistant Professor, University of Quebec in Chicoutimi, Saguenay, Quebec
Suzy Ngomo– Professor and Director, University of Quebec in Chicoutimi, Saguenay, Quebec
Alexandre Nowotny– Doctoral student, UNOPAR, Londrina, Parana
César Amorim– Professor, UNICID, Sao Paulo, Sao Paulo