Muscle stiffening is associated with muscle mechanoreflex-mediated cardioacceleration
Muscle stiffening is associated with muscle mechanoreflex-mediated cardioacceleration
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肌肉僵硬与肌肉机械反射介导的心脏加速有关
DOI：
10.1007/s00421-022-04885-8
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发表时间：
2022
影响因子：
3
通讯作者：
Muraoka Isao
中科院分区：
文献类型：
--
作者：
Nakamura Nobuhiro;Ikeda Naoki;Heng Peng;Muraoka Isao
目的虽然肌肉机械反射是运动过程中心血管调节的重要中介，但其调节因素尚不清楚。方法将受试者分为低肌力组(n= 15)和高肌力组(n= 15)，比较两组间肌力反射的差异。在仰卧位休息15min后，分别测定安静3min和20°静态被动背屈1min时的心率(HR)、血压(BP)、每搏输出量(SV)和心输出量(CO)。结果高组HR(低组：6 ± 4%，高组：12 ± 4%)和CO(低组：8 ± 10%，高组：13 ± 9%)的峰值相对变化均大于低组(均P<； 0.05)。SPD时阻力扭矩与肌肉僵硬和HR峰值相对变化呈显著正相关(r= 0.5 1和0.6 1，P<； 0.0 5)。而SPD时肌肉伸长与HR峰值相对变化无相关性(r= −=0.23，P= 0.20)。结论肌肉僵硬可能是肌肉机械反射的调节因素。
PurposeAlthough the muscle mechanoreflex is an important mediator to cardiovascular regulation during exercise, its modulation factors remain relatively unknown. Therefore, the purpose of this study was to investigate the effect of muscle stiffness on the muscle mechanoreflex.MethodsParticipants were divided based on their median muscle stiffness (2.00 Nm/mm) into a low group (n= 15) and a high group (n= 15), and the muscle mechanoreflex was compared between the groups. After a 15-min rest in the supine position, heart rate (HR), blood pressure (BP), stroke volume (SV), and cardiac output (CO) were measured at rest for 3 min and during static passive dorsiflexion (SPD) at 20° for 1 min. Following a 15-min re-rest, muscle stiffness and passive resistive torque were evaluated in the distal end of the muscle belly of the medial gastrocnemius.ResultsPeak relative changes in HR (low group: 6 ± 4% and high group: 12 ± 4%) and CO (low group: 8 ± 10% and high group: 13 ± 9%) were greater in the high group than in the low group (both,P< 0.05). A significant positive correlation was found between resistive torque during SPD and muscle stiffness and peak relative changes in HR (r= 0.51 and 0.61, bothP< 0.05). However, there was no correlation between muscle elongation during SPD and peak relative changes in HR (r= − 0.23,P= 0.20).ConclusionThese findings suggest that muscle stiffness may be modulatory factor of muscle mechanoreflex.
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DOI：
10.1016/0034-5687(94)90075-2
发表时间：
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期刊：
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影响因子：
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DOI：
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发表时间：
2006-12-01
影响因子：
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