title: Infrared-emitting diode and optic fibers for underwater force measurement in heart muscle.
mesh_terms: D004560:Electricity; D004566:Electrodes; D007101:Immersion; D007259:Infrared Rays; D009119:Muscle Contraction; D010210:Papillary Muscles / Q000502:physiology*; D010781:Photography; D014159:Transducers / Q000295:instrumentation*