Transversus abdominis is part of a global not local muscle synergy during arm movement.

@article{Morris2013TransversusAI,
  title={Transversus abdominis is part of a global not local muscle synergy during arm movement.},
  author={Susan Morris and Brendan S Lay and Garry T Allison},
  journal={Human movement science},
  year={2013},
  volume={32 5},
  pages={1176-85}
}
The trunk muscle transversus abdominis (TrA) is thought to be controlled independently of the global trunk muscles. Methodological issues in the 1990s research such as unilateral electromyography and a limited range of arm movements justify a re-examination of this theory. The hypothesis tested is that TrA bilateral co-contraction is a typical muscle… CONTINUE READING