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Unpowered Knee Exoskeleton Reduces Quadriceps Activity during Cycling
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Unpowered Knee Exoskeleton Reduces Quadriceps Activity during Cycling
Engineering (/paperList?type=1&journalId=111442)( IF 12.834 ) Pub Date: 2018-08-01 , DOI:10.1016/j.eng.2018.07.011
Ronnapee Chaichaowarat , Jun Kinugawa , Kazuhiro Kosuge
Abstract Cycling is an eco-friendly method of transport and recreation. With the intent of reducing the energy cost of cycling without providing an ad
energy source, we have proposed the use of a torsion spring for knee-extension support. We developed an exoskeleton prototype using a crossing
mechanism as a knee joint with an embedded torsion spring. This study evaluates the passive knee exoskeleton using constant-power cycling test
by eight healthy male participants. We recorded the surface electromyography over the rectus femoris muscles of both legs, while the participants c
and 225 W on a trainer with the developed wheel-accelerating system. We then analyzed these data in time–frequency via a continuous wavelet tra
the same cycling speed and leg cadence, the median power spectral frequency of the electromyography increases with cycling load. At the same c
the median power spectral frequency decreases when cycling with the exoskeleton. Quadriceps activity can be relieved despite the exoskeleton co
electrical energy and not delivering net-positive mechanical work. This fundamental can be applied to the further development of wearable devices
assistance.
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