Purpose Examine for injury risk factors and establish clinical cut-off values related to size and function of trunk muscles.Methods A prospective study of 28 professional Rugby League players was conducted.Cross-secti...Purpose Examine for injury risk factors and establish clinical cut-off values related to size and function of trunk muscles.Methods A prospective study of 28 professional Rugby League players was conducted.Cross-sectional areas(CSAs)of the multifidus(MF),quadratus lumborum(QL)and ability to contract the abdominal and MF muscles were measured from pre-season ultrasound images.Playing season injuries resulting in games missed were recorded by club personnel.Logistic regression models were used to determine the adjusted odds ratios for trunk muscle measures as risk factors for playing season injuries.Results The adjusted odds ratio(OR)values indicated that if a player had a small MF muscle(<9.98 cm^(2)at L5;P=0.032)or a small QL(<10.8 cm^(2);P=0.045),their odds of more games missed due to season injuries was increased(OR MF=9.4;95%CI=1.21-72.9;OR QL=7.3;95%CI=1.1-51.6).For players with increased contraction of the MF(contraction>7.2%;P=0.028)and abdominal muscles(>49.9%;P=0.08),the odds of sustaining a concussion were increased(OR MF 14.5;95%CI 1.3-159;OR transversus abdominis 6.2;95%CI=0.8-48.6).Conclusion As size and ability to contract trunk muscles are modifiable factors,further intervention studies targeting motor control of these muscles may be warranted.展开更多
[Purpose] Capacitive and resistive electric transfer (CRET) is becoming prevalent in sports settings. CRET is effective for improving pain and healing injured tissue;however, its influence on muscle function and morph...[Purpose] Capacitive and resistive electric transfer (CRET) is becoming prevalent in sports settings. CRET is effective for improving pain and healing injured tissue;however, its influence on muscle function and morphology is still unclear. This study confirmed the immediate effects of CRET on the duration of muscular stiffness and range of motion (ROM). [Method] This study describes the protocol for a single-arm trial with the non-blinding of participants and researchers. Twenty-four healthy men participated in the study. They received CRET therapy for their low back areas. The muscular stiffness of the multifidus muscle (superficial and deep) and the ROM using the active straight leg raise (ASLR) test were measured pre-intervention, post-intervention (immediately), and 15 and 30 min post-intervention. We compared these parameters using a one-way analysis of variance and Dunnett’s test (multiple comparison tests for subtests). [Results] The muscular stiffness of the superficial and deep multifidus muscles was significantly decreased, and the ASLR test showed a significant increase compared with the test performed pre-intervention. In addition, these effects persisted for 30 min. [Conclusion] Warm-up is vital for improving muscular stiffness and increasing the ROM. CRET is a useful device for achieving these aims, particularly as a passive warm-up method in sports settings.展开更多
文摘Purpose Examine for injury risk factors and establish clinical cut-off values related to size and function of trunk muscles.Methods A prospective study of 28 professional Rugby League players was conducted.Cross-sectional areas(CSAs)of the multifidus(MF),quadratus lumborum(QL)and ability to contract the abdominal and MF muscles were measured from pre-season ultrasound images.Playing season injuries resulting in games missed were recorded by club personnel.Logistic regression models were used to determine the adjusted odds ratios for trunk muscle measures as risk factors for playing season injuries.Results The adjusted odds ratio(OR)values indicated that if a player had a small MF muscle(<9.98 cm^(2)at L5;P=0.032)or a small QL(<10.8 cm^(2);P=0.045),their odds of more games missed due to season injuries was increased(OR MF=9.4;95%CI=1.21-72.9;OR QL=7.3;95%CI=1.1-51.6).For players with increased contraction of the MF(contraction>7.2%;P=0.028)and abdominal muscles(>49.9%;P=0.08),the odds of sustaining a concussion were increased(OR MF 14.5;95%CI 1.3-159;OR transversus abdominis 6.2;95%CI=0.8-48.6).Conclusion As size and ability to contract trunk muscles are modifiable factors,further intervention studies targeting motor control of these muscles may be warranted.
文摘[Purpose] Capacitive and resistive electric transfer (CRET) is becoming prevalent in sports settings. CRET is effective for improving pain and healing injured tissue;however, its influence on muscle function and morphology is still unclear. This study confirmed the immediate effects of CRET on the duration of muscular stiffness and range of motion (ROM). [Method] This study describes the protocol for a single-arm trial with the non-blinding of participants and researchers. Twenty-four healthy men participated in the study. They received CRET therapy for their low back areas. The muscular stiffness of the multifidus muscle (superficial and deep) and the ROM using the active straight leg raise (ASLR) test were measured pre-intervention, post-intervention (immediately), and 15 and 30 min post-intervention. We compared these parameters using a one-way analysis of variance and Dunnett’s test (multiple comparison tests for subtests). [Results] The muscular stiffness of the superficial and deep multifidus muscles was significantly decreased, and the ASLR test showed a significant increase compared with the test performed pre-intervention. In addition, these effects persisted for 30 min. [Conclusion] Warm-up is vital for improving muscular stiffness and increasing the ROM. CRET is a useful device for achieving these aims, particularly as a passive warm-up method in sports settings.
