Biomechanical analysis of local and global strengthening of gluteus medius

2020

Preprint

Background The hip abductor muscles play an important role in stabilizing the pelvis during gait, its main function being performed by the gluteus medius. Gluteus medius insufficiency is associated with biomechanical alterations and musculoskeletal disorders. Due to overweight and a possible muscle mass decrease, maintaining the abductor muscular function can be a great challenge for obese. However, it is still unclear whether the musculature of obese individuals manages to compensate for these alterations. Therefore, the aim of this study was to compare the gluteus medius strength between obese and normal weight individuals using a digital hand-held dynamometer. Methods Twenty-five obese (body mass index > 35 kg / m 2 ) participated in the study, being matched in gender, age, and height with normal weight individuals. The gluteus medius strength was measured by a single examiner using a belt-stabilized hand-held digital dynamometer on the knee of individuals positioned in lateral decubitus. Three measurements were recorded with rest intervals, considering only the highest value measured for each limb for analysis. The difference between pairs was calculated and the data distribution pattern was assessed using the Shapiro-Wilk test (p < 0.05), and the matrices of the variables were standardized and analyzed using the principal component analysis (PCA). Results For the strength variables (Newtons) on both sides, no statistical differences were detected between groups (p > 0.05). However, statistical differences were detected in these variables between groups (p < 0.05) when normalizing the measurements in relation to individuals' weight (Newtons / kilograms). The PCA indicates that both strength in absolute values and normalized by weight are reduced in obese individuals. Conclusions These findings indicate that obese individuals have the same or lower strength (PCA) to move more mass, which may suggest a relative weakness that induces functional limitation.

Section: Discussionmentioning

confidence: 86%

Comparison of the gluteus medius strength between obese and eutrophic individuals: a cross-sectional study

2020

Preprint

“…The determination of the force required by abductor muscles to body balance in a standing position depends on two variables: pelvic anatomy and body weight [59]. In the present study, since there was a pairing in relation to gender, age, and height, it is considered that there was a similarity in the pelvic anatomy between the pairs.…”

Section: Discussionmentioning

confidence: 89%

Comparison of the gluteus medius strength between obese and eutrophic individuals: a cross-sectional study

2020

Preprint

Background: The hip abductor muscles play an important role in stabilizing the pelvis during gait, with its main function being performed by the gluteus medius. Gluteus medius insufficiency is associated with biomechanical alterations and musculoskeletal disorders. Due to being overweight and a possible muscle mass decrease, maintaining the abductor muscular function can be a great challenge for the obese. However, it is still unclear whether the musculature of obese individuals manages to compensate for these alterations. Therefore, the aim of this study was to compare the gluteus medius strength between obese and normal weight individuals using a digital hand-held dynamometer.Methods: Twenty-five obese (BMI > 35 kg / m2) participated in the study, being matched in gender, age, and height with normal weight individuals. The gluteus medius strength was measured by a single examiner using a belt-stabilized hand-held digital dynamometer on the knee of individuals positioned in lateral decubitus. Three measurements were recorded with rest intervals, considering only the highest value measured for each limb for analysis. The difference between pairs was calculated and the data distribution pattern was assessed using the Shapiro-Wilk test (p < 0.05), and the matrices of the variables were standardized and analyzed using the principal component analysis (PCA).Results: For the strength variables (Newtons) on both sides, no statistical differences were detected between the groups (p > 0.05). However, statistical differences were detected in these variables between the groups (p < 0.05) when normalizing the measurements in relation to individuals' weights (Newtons / kilograms). The PCA indicates that both strength in absolute values and normalized by weight are reduced in obese individuals.Conclusions: These findings indicate that obese individuals have the same or lower strength (PCA) to move more mass, which may suggest a relative weakness that induces functional limitation.Trial registration: The study was approved by the UNIOESTE Human Research Ethics Committee (#1.180.202) in July 2015.

“…The determination of the force required by the abductor muscles to balance the body in a standing position depends on two variables: pelvic anatomy and body weight [37]. In the present study, since individuals were paired in relation to sex, age, and height, it is assumed that there was a similarity in the pelvic anatomy between the pairs.…”

Section: Discussionmentioning

confidence: 98%

“…Obese individuals who were beginning ambulatory follow-ups at the Obesity and Bariatric Surgery Service in the Western Paraná University Hospital (Cascavel, Paraná, Brazil) were included in the study. These individuals were of both sexes, were aged 20 to 60 years old, had grade II and III obesity, and had a body mass index (BMI) higher than 35 kg/m 2 [37,38]. The exclusion criteria were pregnancy, an orthopaedic disease of the lower limbs, locomotor system pain or sequelae, paresthesia or weakness in the lower limbs, orthostatic or walking pain, heart disease, or other diseases with restricted functional capacity.…”

Section: Methodsmentioning

confidence: 99%

Comparison of gluteus medius strength between obese and eutrophic individuals: a cross-sectional study

2020

Preprint

Background: The hip abductor muscles, primarily the gluteus medius, play an important role in stabilizing the pelvis during gait. Gluteus medius weakness is associated with biomechanical changes and musculoskeletal disorders. Obese individuals can have great difficulty maintaining abductor muscular function due to being overweight and possibly experiencing a decrease in muscle mass. However, it is still unclear whether the musculature of obese individuals can compensate for these changes. Therefore, the aim of this study was to compare gluteus medius strength between obese and normal-weight individuals using a digital hand-held dynamometer.Methods: Twenty-five obese (BMI > 35 kg/m2) participants were matched for sex, age, and height with normal-weight individuals. Gluteus medius strength was measured by a single examiner using a belt-stabilized hand-held digital dynamometer placed on the knee of the individuals positioned in lateral decubitus. Three measurements were recorded with rest intervals, and only the highest value measured for each limb was used for analysis. The differences between pairs were calculated, and the normality of the data was assessed using the Shapiro-Wilk test (p < 0.05). The matrices of the variables were standardized and analysed using principal component analysis (PCA).Results: For the strength variables (Newtons) on both sides, no significant differences were detected between the groups (p > 0.05). However, significant differences were detected in these variables between the groups (p < 0.05) when the measurements were normalized to body weight (Newtons/kilograms). PCA indicated that both the absolute and normalized values of strength are lower in obese than in normal-weight individuals.Conclusions: These findings indicate that obese individuals have the same or less strength (PCA) to move more mass, which may suggest a relative weakness that induces functional limitations.Trial registration: The study was approved by the UNIOESTE Human Research Ethics Committee (#1.180.202) in July 2015.