Muscle stiffness estimation using a system identification technique applied to evoked mechanomyogram during cycling exercise

Uchiyama, Takanori; Saito, Kazuhisa; Shinjo, Katsuya

doi:10.1016/j.jelekin.2015.09.005

Cited by 8 publications

(14 citation statements)

References 28 publications

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“…The estimation method of stiffness and viscous coefcients was similar to our previous study [4]. The signals were divided into two sequences: stimulated and non-stimulated.…”

Section: Discussionmentioning

confidence: 99%

“…We have shown previously that muscle stiffness increases as the workload increases in cycling exercise, and also increases with increasing power output, which is a product of workload and pedaling rate [4]. However, in that study the increase in muscle stiffness was examined at various combinations of workload and pedaling rate, and thus the power output varied.…”

Section: Introductionmentioning

confidence: 92%

“…1). The setup was similar to that we reported previously [4], but with slight modi cations of stimulation timing, and electrode position and distance, to obtain high amplitude-evoked MMGs.…”

Section: Measurementmentioning

confidence: 99%

“…Stiffness can store kinetic energy as an elastic energy and release it to achieve ef cient and smooth motion. Stiffness can be estimated by providing an input, such as a mechanical impulse [1] or electrical stimulation [2][3][4][5], and measuring the response [1][2][3][4][5]. For example, Orizio et al [2] used amplitude modulation of electrical stimulation pulses, and identi ed the transfer function from the stimulation to the torque [or mechanomyogram (MMG)] as the second-order model with time lag.…”

Section: Introductionmentioning

confidence: 99%

“…Yamaguchi et al [3] also proposed a method using an electrical stimulation pulse and measuring an MMG, termed an impulse response. This method was modi ed and applied to estimate muscle stiffness in cycling exercise [4] and walking [5]. Cycling exercise can be measured using a cycle ergometer, as it is easy to set the desired workload and pedaling rate.…”

Section: Introductionmentioning

confidence: 99%

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Stiffness and Viscosity of the Vastus Lateralis Muscle in Cycling Exercises at Low Constant Power Output

Uchiyama

Saito

2018

ABE

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We examined muscle stiffness at various pedaling rates under conditions of constant power output. Eight healthy young participants pedaled a cycle ergometer at a power output of 47 W. The combinations of pedaling rate and workload were 40 revolutions per min (rpm) and 11.7 N, 60 rpm and 7.8 N, and 80 rpm and 5.9 N, respectively. One electrical stimulus per two pedal rotations was applied to the vastus lateralis muscle at a crank angle of 30 in the down phase. Mechanomyograms (MMGs) were measured using a capacitor microphone, and the evoked MMG was extracted. An evoked MMG system was identi ed, and the coef cients of the denominator of the transfer function were used to estimate stiffness and viscous coef cient of the muscle. Muscle stiffness was 236-705 Nm −1 , and was proportional to the pedaling rate when power output was held constant, while the viscous coef cient did not change from approximately 15 Nm −1 s. In conclusion, our ndings demonstrate that stiffness of the vastus lateralis muscle increases with increasing pedaling rate under conditions of constant power output, while the viscous coef cient does not change.

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“…The estimation method of stiffness and viscous coefcients was similar to our previous study [4]. The signals were divided into two sequences: stimulated and non-stimulated.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Measurementmentioning

confidence: 99%