Researchers have developed a minimally invasive, fiber optic technique to accurately measure the passive stretch and twitch contraction of living muscle tissue. Termed as resonant reflection spectroscopy (RSS), this technique could someday be an alternative to the painful muscle biopsies used to diagnose and treat a wide range of movement disorders including stroke, traumatic brain injury, spinal cord injury, Parkinson’s disease, and cerebral palsy. Here’s how the RSS works: a laser source continuously sweeps across and illuminates muscle through a very thin (1/4 millimeter) fiber optic probe, which is inserted directly into the muscle belly and positioned parallel to sarcomeres (the contractile units of muscle tissue). The same optical probe collects reflected light from the muscle, and these data are then used to calculate sarcomere length. Read more about this news or go back to the original post here.

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