Background: An impact of regular physical activity(RPA) on the abdominal muscles may be significant when comparing various symptomatic groups. However, there is lack comprehensive information in this field. The object...Background: An impact of regular physical activity(RPA) on the abdominal muscles may be significant when comparing various symptomatic groups. However, there is lack comprehensive information in this field. The objective of this study was to assess the lateral abdominal wall at rest and during abdominal drawing-in manoeuvre in adolescent physically active girls in different body positions.Methods: One hundred and forty-four female students, 13–17 years of age, participated in the study. Participants were divided into 2 groups based on a physical activity(PA) statement. Measurements of the thickness of the abdominal muscles at rest and during abdominal drawing-in manoeuvre were made in the supine and standing positions by ultrasound imaging.Results: Compared to the control group, activities of the obliquus internus and transversus abdominis muscles were higher in the regular PA group by 8.9%(95%CI: 3.1–14.7) and 36%(95%CI: 19.1–47.5), respectively. In the RPA group, the transversus abdominis preferential activation ratio was greater by 0.03(95%CI: 0.01–0.04), and the contraction ratio was greater by a mean value of 0.35(95%CI: 0.18–0.46).Conclusion: RPA does not have any effect on the resting thickness of the abdominal muscles in the supine and standing positions. Girls performing RPA have a greater ability to perform an independent activation and greater contractions of the transversus abdominis.展开更多
Background:Most papers examining the lateral abdominal muscles(LAMs)and low back pain(LBP)are cross-sectional,with groups of participants being divided into a control and an LBP group.We hypothesized that morphologica...Background:Most papers examining the lateral abdominal muscles(LAMs)and low back pain(LBP)are cross-sectional,with groups of participants being divided into a control and an LBP group.We hypothesized that morphological measurements of the LAMs in adolescent soccer players may predict future LBP incidence.The aim of this study was to examine the associations between the morphology of LAMs and LBP incidence rate among adolescent soccer players.Methods:Ninety-seven adolescent male soccer players with no LBP at baseline were recruited into the prospective cohort study.The thickness of the LAMs was measured at baseline by ultrasound imaging in a supine rest position.Nine cases of LBP occurred during the follow-up 6-month observation.Results:An obliquus internus(OI)asymmetry was related to increasing LBP risk(odds ratio=19.99;95%CI:2.4-167.9).Spearman correlation also showed a linear relationship between OI asymmetry value and duration of LBP(R=0.75,p=0.02).An OI side-to-side difference greater than 1.25 mm suggests possible LBP incidence in the 6-month observation among adolescent soccer players.Conclusion:The morphological changes of the OI may be related to LBP’s incidence in adolescent soccer players.The presence of OI asymmetry increases the odds of LBP by at least 2.4 times.Hypertrophy of the OI on one side of the body may contribute to trunk muscle imbalance.展开更多
文摘Background: An impact of regular physical activity(RPA) on the abdominal muscles may be significant when comparing various symptomatic groups. However, there is lack comprehensive information in this field. The objective of this study was to assess the lateral abdominal wall at rest and during abdominal drawing-in manoeuvre in adolescent physically active girls in different body positions.Methods: One hundred and forty-four female students, 13–17 years of age, participated in the study. Participants were divided into 2 groups based on a physical activity(PA) statement. Measurements of the thickness of the abdominal muscles at rest and during abdominal drawing-in manoeuvre were made in the supine and standing positions by ultrasound imaging.Results: Compared to the control group, activities of the obliquus internus and transversus abdominis muscles were higher in the regular PA group by 8.9%(95%CI: 3.1–14.7) and 36%(95%CI: 19.1–47.5), respectively. In the RPA group, the transversus abdominis preferential activation ratio was greater by 0.03(95%CI: 0.01–0.04), and the contraction ratio was greater by a mean value of 0.35(95%CI: 0.18–0.46).Conclusion: RPA does not have any effect on the resting thickness of the abdominal muscles in the supine and standing positions. Girls performing RPA have a greater ability to perform an independent activation and greater contractions of the transversus abdominis.
文摘Background:Most papers examining the lateral abdominal muscles(LAMs)and low back pain(LBP)are cross-sectional,with groups of participants being divided into a control and an LBP group.We hypothesized that morphological measurements of the LAMs in adolescent soccer players may predict future LBP incidence.The aim of this study was to examine the associations between the morphology of LAMs and LBP incidence rate among adolescent soccer players.Methods:Ninety-seven adolescent male soccer players with no LBP at baseline were recruited into the prospective cohort study.The thickness of the LAMs was measured at baseline by ultrasound imaging in a supine rest position.Nine cases of LBP occurred during the follow-up 6-month observation.Results:An obliquus internus(OI)asymmetry was related to increasing LBP risk(odds ratio=19.99;95%CI:2.4-167.9).Spearman correlation also showed a linear relationship between OI asymmetry value and duration of LBP(R=0.75,p=0.02).An OI side-to-side difference greater than 1.25 mm suggests possible LBP incidence in the 6-month observation among adolescent soccer players.Conclusion:The morphological changes of the OI may be related to LBP’s incidence in adolescent soccer players.The presence of OI asymmetry increases the odds of LBP by at least 2.4 times.Hypertrophy of the OI on one side of the body may contribute to trunk muscle imbalance.
