| （1.Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education，East China Normal University，Shanghai 200241，China；2.School of Physical Education & Health Care，East China Normal University，Shanghai 200241，China；3.School of Physical Education，Zunyi Medical College，Zunyi 563000，China) Abstract: By utilizing surface myoelectricity contribution rate, the authors compared the universality of sit-ups in 3 different postures (both arms crossing over the chest, both hands on thighs, both arms at both sides) in fitness testing in terms of age and gender factors, so as to provide a theoretical criterion for screening out sit-ups in the optimal posture in a scientific and accurate way. Basing the test objects on 270 students aged 6-14, the authors tested the myoelectricity values of 14 muscles in the whole body of every student during completing the said strength quality testing, and then standardized them into surface myoelectricity contribution rates, carried out an age and gender factors analysis of variance and a comparison of differences between indexes on the surface myoelectricity contri-bution rates of all the muscles involved in sit-ups in 3 different postures, and revealed the following findings: the numbers of the age, gender and their interaction significant muscles involved in sit-ups with both arms crossing over the chest are respectively 1, 7 and 2 pieces, the number of pairs in the age effect difference significant age groups are totally 45 pairs of male and female students, the number of gender effect difference significant muscles is 9 pieces, there are 5 age groups; the numbers of the age, gender and their interaction significant muscles involved in sit-ups with both hands on thighs are respectively 5, 6 and 5 pieces, the number of pairs in the age effect difference significant age groups are totally 101 pairs of male and female students, the number of gender effect difference significant muscles is 11 pieces, there are 13 age groups; the numbers of the age, gender and their interaction significant muscles involved in sit-ups with both arms at both sides are respectively 2, 10 and 3 pieces, the number of pairs in the age effect difference significant age groups are totally 82 pairs of male and female students, the number of gender effect difference signifi-cant muscles is 13 pieces, there are 11 age groups. The said findings indicate that among sit-ups in 3 different postures (both arms crossing over the chest, both hands on thighs, both arms at both sides) done by students aged 6-14, sit-ups with both arms crossing over the chest has the highest age and gender universality.
Key words: sports physiology；surface myoelectricity；trunk strength；sit-up；age；gender |
