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Age and sex differences in ranges of motion and motion patterns

Hwang J., Jung M.- C.

International Journal of Occupational Safety and Ergonomics

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2015

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Vol. 21, No. 2

173--186

EN

This study investigated the effects of age and sex on joint ranges of motion (ROMs) and motion patterns. Forty participants performed 18 motions using eight body segments at self-selected speeds. Older subjects showed smaller ROMs than younger subjects for 11 motions; the greatest difference in ROM was 44.9% for eversion/inversion of the foot. Older subjects also required more time than younger subjects to approach the peak angular velocity for six motions. In contrast, sex significantly affected ROMs but not motion patterns. Male subjects exhibited smaller ROMs than female subjects for four motions; the greatest sex-dependent difference in ROM was 29.7% for ulnar/radial deviation of the hand. The age and sex effects depended on the specific segments used and motions performed, possibly because of differences in anatomical structures and frequencies of use of the joints in habitual physical activities between the groups.

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Experimental Study on Gender Differences in Hands and Sequence of Force Application on Grip and Hand-Grip Control

Liao K. - H.

International Journal of Occupational Safety and Ergonomics

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2014

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Vol. 20, No. 1

77--90

EN

The purpose of this study was to examine how gender of young adults in Taiwan affected the ability of their hands to apply force regarding the use of the left or right hand and the varying sequences of force application. Maximal voluntary contraction of grip (MVC g) and hand-grip control (HGC 50%) of 200 participants was measured. The study discovered that gender showed significant differences in the scale of MVC g, whereas there were no significant differences in HGC 50%. Left hand versus right hand resulted in significant differences in the scale of MVC g, whereas there were no significant differences in the scale of HGC 50%. The 5 levels of the sequence of force application showed no significant differences in either MVC g or HGC 50%. The interactive effects of the 3 factors (gender, hand, and sequence of force application) showed no significant differences. The results of the study can serve as a reference in designing tools.

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Injuries Among Slovenian Physical Education Teachers: A Cross-Sectional Study

Kovac M., Leskosek B., Hadzic V., Jurak G.

International Journal of Occupational Safety and Ergonomics

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2013

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Vol. 19, No. 1

87--95

EN

A cross-sectional study was carried out to examine the frequency and types of serious injuries in physical educators throughout their professional career, in relation to their gender, age and teaching level, certain factors causing the injuries and the consequences of those injuries on their working ability. The subjects (n = 468) answered a self-administered questionnaire. In men, one group's higher frequency of injuries was 1.8 (95% CI [1.26, 2.57]) times higher than in women. Every year in age increased the odds for moving into a group with a higher frequency of injuries by 7.6% (95% CI [1.06, 1.10]). The most common injuries for both genders were lower limb injuries. The most common cause of injury was the teacher's own mistake. Over 60% of teachers had to modify their teaching after an injury. It is necessary to further explore preventive strategies to reduce injuries in these workers.