TY - JOUR
T1 - Acute effects of dermal suction on passive muscle and joint stiffness
AU - Enomoto, Shota
AU - Shibutani, Tomonari
AU - Akihara, Yu
AU - Nakatani, Miyuki
AU - Yamada, Kazunori
AU - Oda, Toshiaki
N1 - Funding Information:
Conflicts of Interest: This study was funded by MJ Company. K.K. and Fourleaf. K.K. Tomonari Shibutani is the President of the MJ Company. K.K. and Fourleaf. K.K.
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/11
Y1 - 2021/11
N2 - The aim of the present study was to examine the acute effects of dermal suction on the passive mechanical properties of specific muscles and joints. Dermal suction was applied to the calves of 24 subjects. Passive plantar flexion torque was measured with the right knee fully extended and the right ankle positioned at 20◦, 10◦, 0◦, and −10◦ angles, where 0◦ represents the ankle neutral position, and positive values correspond to the plantar flexion angle. The shear wave velocity (SWV) (m/s) of the medial gastrocnemius was measured in the same position using ultrasound shear wave elastography. The relationship between the joint angle and passive torque at each 10◦ angle was defined as passive joint stiffness (Nm/◦ ). Passive muscle and joint stiffness were measured immediately before and after the dermal suction protocol. When the ankle joint was positioned at 20◦ (r = 0.53, P = 0.006), 10◦ (r = 0.43, P = 0.030), and −10◦ (r = 0.60, P = 0.001), the SWV was significantly higher after dermal suction than that before dermal suction. Regarding joint stiffness, we found no significant difference between the pre-and post-dermal suction values (partial η2 = 0.093, P > 0.05). These findings suggest that dermal suction increases passive muscle stiffness and has a limited impact on passive joint stiffness.
AB - The aim of the present study was to examine the acute effects of dermal suction on the passive mechanical properties of specific muscles and joints. Dermal suction was applied to the calves of 24 subjects. Passive plantar flexion torque was measured with the right knee fully extended and the right ankle positioned at 20◦, 10◦, 0◦, and −10◦ angles, where 0◦ represents the ankle neutral position, and positive values correspond to the plantar flexion angle. The shear wave velocity (SWV) (m/s) of the medial gastrocnemius was measured in the same position using ultrasound shear wave elastography. The relationship between the joint angle and passive torque at each 10◦ angle was defined as passive joint stiffness (Nm/◦ ). Passive muscle and joint stiffness were measured immediately before and after the dermal suction protocol. When the ankle joint was positioned at 20◦ (r = 0.53, P = 0.006), 10◦ (r = 0.43, P = 0.030), and −10◦ (r = 0.60, P = 0.001), the SWV was significantly higher after dermal suction than that before dermal suction. Regarding joint stiffness, we found no significant difference between the pre-and post-dermal suction values (partial η2 = 0.093, P > 0.05). These findings suggest that dermal suction increases passive muscle stiffness and has a limited impact on passive joint stiffness.
KW - Elastography
KW - Flexibility
KW - Medial gastrocnemius
KW - Shear wave velocity
KW - Ultrasound
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U2 - 10.3390/healthcare9111483
DO - 10.3390/healthcare9111483
M3 - Article
AN - SCOPUS:85118796954
SN - 2227-9032
VL - 9
JO - Healthcare (Switzerland)
JF - Healthcare (Switzerland)
IS - 11
M1 - 1483
ER -
