Department of Physical Education, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain.
PLoS One. 2010 Dec 31;5(12):e15858. doi: 10.1371/journal.pone.0015858.
To determine the volume and degree of asymmetry of the musculus rectus abdominis (RA) in professional tennis players.
The volume of the RA was determined using magnetic resonance imaging (MRI) in 8 professional male tennis players and 6 non-active male control subjects.
Tennis players had 58% greater RA volume than controls (P = 0.01), due to hypertrophy of both the dominant (34% greater volume, P = 0.02) and non-dominant (82% greater volume, P = 0.01) sides, after accounting for age, the length of the RA muscle and body mass index (BMI) as covariates. In tennis players, there was a marked asymmetry in the development of the RA, which volume was 35% greater in the non-dominant compared to the dominant side (P<0.001). In contrast, no side-to-side difference in RA volume was observed in the controls (P = 0.75). The degree of side-to-side asymmetry increased linearly from the first lumbar disc to the pubic symphysis (r = 0.97, P<0.001).
Professional tennis is associated with marked hypertrophy of the musculus rectus abdominis, which achieves a volume that is 58% greater than in non-active controls. Rectus abdominis hypertrophy is more marked in the non-dominant than in the dominant side, particularly in the more distal regions. Our study supports the concept that humans can differentially recruit both rectus abdominis but also the upper and lower regions of each muscle. It remains to be determined if this disequilibrium raises the risk of injury.
确定职业网球运动员腹直肌（RA）的体积和不对称程度。
使用磁共振成像（MRI）对 8 名职业男性网球运动员和 6 名非活跃男性对照者的 RA 体积进行了测定。
与对照组相比，网球运动员的 RA 体积大 58%（P=0.01），这是由于优势侧（体积增加 34%，P=0.02）和非优势侧（体积增加 82%，P=0.01）的肌肉肥大所致，在考虑年龄、RA 肌肉长度和体重指数（BMI）作为协变量后。在网球运动员中，RA 的发育存在明显的不对称性，非优势侧的 RA 体积比优势侧大 35%（P<0.001）。相比之下，对照组的 RA 体积没有侧到侧的差异（P=0.75）。RA 体积的侧到侧不对称程度从第一腰椎间盘到耻骨联合呈线性增加（r=0.97，P<0.001）。
职业网球运动与腹直肌明显肥大有关，其体积比非活跃对照组大 58%。非优势侧的 RA 肥大比优势侧更为明显，特别是在更远端的区域。我们的研究支持这样一种观点，即人类可以有区别地募集腹直肌，也可以募集每块肌肉的上、下部。这种不平衡是否会增加受伤的风险还有待确定。
