Ultrasound assessment of trunk muscles and back flexibility, strength and endurance in off-road cyclists with and without low back pain.
To compare the thickness of lateral abdominal muscles and Cross Sectional Area (CSA) of lumbar Multifidus Spinae (LM) muscles of competitive off-road cyclists with and without Low Back Pain (LBP). We also aimed to compare the maximum isometric back strength and endurance, as well as flexibility of lower back in cyclists with LBP and in the controls.



The thickness of Transversus Abdominis (TrA), Internal Oblique (IO) and External Oblique (EO) along with the CSA of LM muscles of 14 professional competitive off-road cyclists with LBP and 24 controls were measured by ultrasound (US) in hook-lying position on the examination table, and mounted on the bicycle. In addition, the back strength and endurance of the subjects and the flexibility of the participants were measured.



Data showed a significantly lower thickness of Transversus Abdominis (TrA) and CSA of LM muscles in cyclists with LBP comparing to controls in all positions. No significant result regarding the flexibility of the subjects in case group comparing with the controls was found (p= 0.674). In addition, it was found that there is no significant difference in isometric back strength of the subjects between the groups (p= 0.105). However, we found that subjects with LBP have a lower endurance in back dynamometry with 50% of their maximum isometric back strength (p= 0.016).



In this study, useful information regarding possible factors associated with low back pain in off- road cyclists was found (lower thickness of TrA and LM muscles and decreased back endurance).
Sports Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran.|Spine Division, Noorafshar Rehabilitation & Sports Medicine Hospital, Tehran, Iran.
Mohsen
M
Rostami
Sports Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran.
Majid
M
Ansari
Sports Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran.
Pardis
P
Noormohammadpour
Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Science, Tehran, Iran.
Mohammad Ali
MA
Mansournia
Sports Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran.|Spine Division, Noorafshar Rehabilitation & Sports Medicine Hospital, Tehran, Iran.
Ramin
R
Kordi
D000009:Abdominal Muscles / Q000000981:diagnostic imaging* / Q000502:physiology; D000328:Adult; D001642:Bicycling / Q000502:physiology*; D006801:Humans; D017116:Low Back Pain / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008297:Male; D053580:Muscle Strength / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology; D060726:Torso / Q000000981:diagnostic imaging* / Q000503:physiopathology; D014463:Ultrasonography; D055815:Young Adult
Ultrasound; cycling; flexibility; lateral abdominal muscle; lumbar multifidus spinae; strength