跑步相关因素对男性业余马拉松运动员大腿肌肉横截面积影响的磁共振研究

A magnetic resonance imaging study of the influence of runner-related factors on the cross-sectional area of thigh muscles in male amateur marathon runners

目的应用磁共振T1WI评估男性业余马拉松运动员大腿前、中、后群肌肉横截面积(cross sectional area,CSA),并探究肌群横截面积与年龄、体重指数(body mass index,BMI)、跑龄、配速、月跑量的相关性。材料与方法招募符合标准的男性业余马拉松运动员64名及不经常运动男性健康志愿者15名,将不经常运动男性健康志愿者设为A组,另选取15名与A组成员身高(5 cm以内)、年龄(3岁以内)、体重(3 kg以内)和BMI(1分以内)相匹配的男性业余马拉松运动员设为B组。所有受试者均行双侧大腿轴面磁共振扫描,在T1WI上勾画不同肌群横截面积。结果A组前群肌肉CSA为(63.16±7.38)cm^(2)低于B组(72.05±8.34)cm^(2),差异有统计学意义(P<0.01);A组后群及内侧群肌肉CSA分别为(31.16±4.78)cm^(2)、(46.06±7.06)cm^(2),均低于B组(33.07±4.05)cm^(2)、(49.51±6.87)cm^(2),差异不具有统计学意义(P值分别为0.248、0.186)。在男性业余马拉松运动员的年龄、BMI、跑龄、配速、月跑量各因素中,只有BMI与各肌群CSA呈正相关,且具有统计学意义。结论长期跑步运动会对增加大腿肌肉横截面积。业余马拉松运动员BMI与大腿肌肉横截面积呈正相关,与跑步相关的年龄、配速、月跑量与大腿肌肉横截面积没有明显相关性。

Objective:To evaluate cross sectional area(CSA)of male amateur marathon runners in front,middle and back legs,and explore the correlation between them and age,body mass index(BMI),running age,speed exercise,and monthly exercise.Materials and Methods:To recruit standard male amateur marathon runners,64 male 15 healthy volunteers,and often do not exercise will not exercise regularly male healthy volunteers set as group A,the other selected 15 with A height(less than 5 cm),age group(3 years),weight(3 kg)and BMI(1 points)that match the male amateur marathon runner set as group B.All subjects underwent bilateral axial mri scans of their thighs,and the cross-sectional areas of different muscle groups were delineated on T1WI images.Results:The anterior muscle CSA of group A(63.16±7.38)cm was lower than that of group B(72.05±8.34)cm,the difference was statistically significant(P<0.01).The CSA of posterior group A and medial group was(31.16±4.78)cm and(46.06±7.06)cm,respectively,lower than that of group B(33.07±4.05)cm and(49.51±6.87)cm,with no statistical significance(P values were 0.248 and 0.186,respectively).Among the factors of male amateur marathon runners’age,BMI,running age,pace and monthly running amount,only BMI was positively correlated with CSA of all muscle groups,and the correlation was statistically significant.Conclusion:Long-term running exercises can increase the cross-sectional area of the anterior thigh muscles.Long-term endurance running training may counteract the effects of age on muscles.There was no significant correlation between running-related age,pace,and monthly running amount and thigh muscle cross-sectional area.