Kinematic aspects of trunk motion and gender effect in normal adults.
BACKGROUND
The purpose of this study was to analyze kinematic trunk motion data in normal adults and to investigate gender effect.


METHODS
Kinematic trunk motion data were obtained for 20 healthy subjects (11 men and 9 women; age from 21 to 40 years) during walking a 9 m long lane at a self selected speed, namely, motions in the sagittal (tilt), coronal (obliquity), and transverse (rotation) planes, which were all expressed as motions in global (relative to the ground) and those in pelvic reference frame (relative to pelvis), i.e., tilt (G), obliquity (G), rotation (G), tilt (P), obliquity (P), rotation (P).


RESULTS
Range of tilt (G), obliquity (G) and rotation (G) showed smaller motion than that of tilt (P), obliquity (P) and rotation (P), respectively. When genders were compared, female trunks showed a 5 degree more extended posture during gait than male trunks (p = 0.002), which appeared to be caused by different lumbar lordosis. Ranges of coronal and transverse plane motion appeared to be correlated. In gait cycle, the trunk motion appeared to counterbalance the lower extremity during swing phase in sagittal plane, and to reduce the angular velocity toward the contralateral side immediate before the contralateral heel strike in the coronal plane.


CONCLUSIONS
Men and women showed different lumbar lordosis during normal gait, which might be partly responsible for the different prevalence of lumbar diseases between genders. However, this needs further investigation.
Department of Orthopedic Surgery, Seoul National University Bundang Hospital, 300 Gumi-Dong, Bundang-Gu, Sungnam, Kyungki 463-707, Korea.
Chin Youb
CY
Chung
Moon Seok
MS
Park
Sang Hyeong
SH
Lee
Se Jin
SJ
Kong
Kyoung Min
KM
Lee
D000328:Adult; D001696:Biomechanical Phenomena / Q000502:physiology*; D005260:Female; D005684:Gait / Q000502:physiology; D006801:Humans; D008141:Lordosis / Q000503:physiopathology; D008297:Male; D009068:Movement / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D012399:Rotation; D012727:Sex Characteristics; D055815:Young Adult