The impact of body mass index on the active range of motion of the lower extremity in sedentary young adults
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Basic Science Department, Faculty of Physical Therapy, Cairo University, Giza, Egypt
Department of Physical Therapy, College of Applied Medical Sciences, University of Hail, Ha’il, Saudi Arabia
Submission date: 2020-05-16
Acceptance date: 2020-09-14
Publication date: 2022-09-26
Physiother Quart. 2022;30(3):64-71
The study aimed to investigate the impact of body mass index (BMI) on the active range of motion (AROM) of the lower extremity joints in healthy sedentary young adults.

Overall, 300 subjects of both genders (aged 18–30 years) were recruited in a way ensuring that the 4 BMI categories (underweight, normal, overweight, and obese) were well represented within the study sample. AROM of hip (flexion, extension, abduction, adduction, external and internal rotation), knee (flexion and extension), and ankle (dorsiflexion and plantar flexion) were measured by using standard manual goniometry. The average of 3 repetitions for each joint movement was recorded.

Hip and knee sagittal movement and ankle dorsiflexion were significantly different between the BMI categories. The underweight and normal participants had statistically significantly highest AROM measures when compared with the overweight and obese individuals. Sagittal hip (flexion: r = –0.344, p < 0.001; extension: r = –0.291, p < 0.001) and knee (r = –0.544, p < 0.001), as well as hip abduction (r = –0.127, p = 0.027) movements exhibited a significant negative correlation with BMI. Rotational hip and ankle joint movements were not correlated with BMI.

Increasing BMI limits the sagittal AROM of the hip and knee joints in sedentary healthy young adults. Obesity and overweight could be listed among the factors affecting sagittal hip and knee AROM.

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