Med Biol Eng Comput - Feasibility of monitoring muscle health in microgravity environments using Myoton technology.


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Physical exercise is important for people living under extreme environmental conditions to stay healthy. Particularly in space, exercise can partially counteract the loss of muscle mass and muscle strength caused by microgravity. Monitoring the adaptation of the musculoskeletal system to assess muscle quality and devise individual training programmes is highly desirable but is restricted by practical, technical and time constraints on board the International Space Station. This study aimed to test the feasibility of using myometric measurements to monitor the mechanical properties of skeletal muscles and tendons in weightlessness during parabolic flights. The mechanical properties (frequency, decrement, stiffness relaxation time and creep) of the m. gastrocnemius, m. erector spinae and Achilles tendon were assessed using the hand-held MyotonPRO device in 11 healthy participants (aged 47 ? 9 years) in normal gravity as well as in microgravity during two parabolic flight campaigns. Results showed significant (p < .05-.001) changes in all mechanical properties of both muscles and the Achilles tendon, indicating a more relaxed tissue state in microgravity. Recordings from a phantom rubber material with the device in a test rig confirmed that the device itself was not affected by gravity, as changes between gravity conditions that were too small (<1 %) to explain the changes observed in the tissues. It is concluded that myometric measurements are a feasible, easy-to-use and non-invasive approach to monitor muscle health in extreme conditions that prohibit many other methods. Real-time assessment of the quality of a muscle being exposed to the negative effect of microgravity and also the positive effects of muscular training could be achieved using Myoton technology.

Resumo Limpo

physic exercis import peopl live extrem environment condit stay healthi particular space exercis can partial counteract loss muscl mass muscl strength caus micrograv monitor adapt musculoskelet system assess muscl qualiti devis individu train programm high desir restrict practic technic time constraint board intern space station studi aim test feasibl use myometr measur monitor mechan properti skelet muscl tendon weightless parabol flight mechan properti frequenc decrement stiff relax time creep m gastrocnemius m erector spina achill tendon assess use handheld myotonpro devic healthi particip age year normal graviti well micrograv two parabol flight campaign result show signific p chang mechan properti muscl achill tendon indic relax tissu state micrograv record phantom rubber materi devic test rig confirm devic affect graviti chang graviti condit small explain chang observ tissu conclud myometr measur feasibl easytous noninvas approach monitor muscl health extrem condit prohibit mani method realtim assess qualiti muscl expos negat effect micrograv also posit effect muscular train achiev use myoton technolog

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