  Spatially distributed limited-cycle oscillators are seen in various physical
and biological systems.
  In internal organs, mechanical motions are induced by the stimuli of
spatially distributed limit-cycle oscillators. We study several mechanical
motions by limit-cycle oscillators using simple model equations. One problem is
deformation waves of radius oscillation induced by desynchronized limit-cycle
oscillators, which is motivated by peristaltic motion of the small intestine. A
resonance-like phenomenon is found in the deformation waves, and particles can
be transported by the deformation waves. Another is the beating motion of the
heart. The expansion and contraction motion is realized by a spatially
synchronized limit-cycle oscillation; however, the strong beating disappears by
spiral chaos, which is closely related to serious arrhythmia in the heart.
