Slow expiration reduces sternocleidomastoid activity and increases transversus abdominis and internal oblique muscle activity during abdominal curl-up - Yoon, T.-L.; Kim, K.-S.; Cynn, H.-S. (Journal of Electromyography and Kinesiology, 2014)
Keywords: exercise; technique; respiration; relation; activation; muscle; EMG; stability; core; USA; training science; biological and medical sciences