Impact of phase difference between cardiac systole and skeletal muscle contraction on hemodynamic response during electrically-induced muscle contractions

Kimura, Tetsuya; Kameda, Naoko; Moritani, Toshio

doi:10.1016/j.jelekin.2010.03.004

Cited by 13 publications

(9 citation statements)

References 21 publications

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“…However, B-SES to the lower limbs may increase the heart’s pumping workload in some instances as reported in the application of conventional EMS [ 22 ]. To resolve the problems, we tried to develop a C-B-SES system by combining our specially modified B-SES equipment with a commercial electrocardiogram monitor.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, we simultaneously measured a real-time stroke volume and cardiac output using a percutaneous analyzer (AESCULON mini ® , Osypka Medical, Berlin, Germany). The instantaneous peripheral vascular resistance was calculated as the ratio of mean blood pressure to stroke volume [ 22 ].…”

Section: Methodsmentioning

confidence: 99%

“…The simplicity and passivity of the training method may allow outpatients to continue the training for a long time. However, there has been an unfavorable report that EMS to the lower limbs increases blood pressure and peripheral vascular resistance [ 22 ]. EMS-induced muscle contraction may increase the intramuscular pressure and elevate the peripheral vascular resistance.…”

Section: Introductionmentioning

confidence: 99%

“…However, there has been an interesting report that EMS to the lower limbs decreases the vascular resistance when the muscle contraction is generated in a cardiac recovery phase [ 22 ]. If we are able to control EMS to the lower limbs to reduce the heart’s pumping workload based on cardiac cycle information, the EMS therapy may be safe for subjects and desirable for patients with heart failure.…”

Section: Introductionmentioning

confidence: 99%

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Cardiac cycle-synchronized electrical muscle stimulator for lower limb training with the potential to reduce the heart's pumping workload

Sasaki

Matsuse

Akimoto³

et al. 2017

PLoS ONE

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BackgroundThe lower limb muscle may play an important role in decreasing the heart’s pumping workload. Aging and inactivity cause atrophy and weakness of the muscle, leading to a loss of the heart-assisting role. An electrical lower limb muscle stimulator can prevent atrophy and weakness more effectively than conventional resistance training; however, it has been reported to increase the heart’s pumping workload in some situations. Therefore, more effective tools should be developed.MethodsWe newly developed a cardiac cycle-synchronized electrical lower limb muscle stimulator by combining a commercially available electrocardiogram monitor and belt electrode skeletal muscle electrical stimulator, making it possible to achieve strong and wide but not painful muscle contractions. Then, we tested the stimulator in 11 healthy volunteers to determine whether the special equipment enabled lower limb muscle training without harming the hemodynamics using plethysmography and a percutaneous cardiac output analyzer.ResultsIn 9 of 11 subjects, the stimulator generated diastolic augmentation waves on the dicrotic notches and end-diastolic pressure reduction waves on the plethysmogram waveforms of the brachial artery, showing analogous waveforms in the intra-aortic balloon pumping heart-assisting therapy. The heart rate, stroke volume, and cardiac output significantly increased during the stimulation. There was no change in the systolic or diastolic blood pressure during the stimulation.ConclusionCardiac cycle-synchronized electrical muscle stimulation for the lower limbs may enable muscle training without harmfully influencing the hemodynamics and with a potential to reduce the heart’s pumping workload, suggesting a promising tool for effectively treating both locomotor and cardiovascular disorders.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cardiac cycle-synchronized electrical muscle stimulator for lower limb training with the potential to reduce the heart's pumping workload

Sasaki

Matsuse

Akimoto³

et al. 2017

PLoS ONE

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“…Alternating cuff occlusion at HR resulted in phase synchronization, and individual heart beats were unlikely to overlap with elevated cuff pressure. In addition, Kimura et al suggested that CLS with an appropriate phase difference attenuates peripheral vascular resistance and systolic blood pressure while increasing stroke volume 9 ) . It is possible that there is a specific phase difference between cardiac systole and muscle contraction that confers peak leg arterial pressure during the lowest muscle capillary resistance.…”

Section: Discussionmentioning

confidence: 99%

Evidence of an association between cardiac-locomotor synchronization and lower leg muscle blood perfusion during walking

2015

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[Purpose] The purpose of this study was to investigate whether the occurrence of cardiac-locomotor synchronization (CLS) improves lower leg muscle blood perfusion during walking. [Subjects and Methods] Eleven healthy men were studied while performing two treadmill protocols. The CLS protocol involved subjects walking at the frequency of their heart rate (HR) to induce CLS. The free protocol (reference) involved subjects walking at a self-selected cadence. The treadmill load was identical in the two protocols. Electrocardiographic signals for HR, foot switch signals for step rate and near-infrared spectroscopy (NIRS) signals for total haemoglobin (total Hb) in the lower leg muscles were measured continuously for 10 min after HR reached a steady state. [Results] The mean HR and mean step rate did not differ between the CLS and free protocols. However, total Hb was significantly higher in the CLS protocol than in the free protocol. The rate of increase in total Hb positively correlated with the strength of CLS. [Conclusion] These results suggest that the occurrence of CLS enhances lower leg muscle blood perfusion by increasing the strength of CLS during walking.

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A Wearable All‐Gel Multimodal Cutaneous Sensor Enabling Simultaneous Single‐Site Monitoring of Cardiac‐Related Biophysical Signals

2022

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can have many applications, such as improving the sense of human motion, recognizing the surface of an object, and monitoring biosignals. [2a-c,3] Recently, with the growing interest in health monitoring, many drawbacks pertaining to conventional sensor systems for acquiring biosignals have been identified; these include material limitations, complex manufacturing processes, portability difficulties, patient discomfort, and the hassle of multiple measurements. To overcome these shortcomings, wearable sensors that are easy to attach, portable, biocompatible, and multimeasurable are required. Wearable skin sensors can sequentially collect data without discomfort or interrupting daily activities, thereby enhancing user compliance with selfmonitoring and improving the quality of patient care. [4] For example, several studies involving the monitoring of single physical parameters, such as electrocardiogram (ECG) [4d,e] and blood pressure (BP), [4f-h] using non-invasive wearable sensors have been reported. Given such remarkable findings, sensor integration has been shifting toward a combination of different sensor modalities. [5] Recently, heart-health screening technology using the correlation of two or more biophysical signals has been attempted to prevent heart diseases and help maintain healthy human lives. In particular, the research on cardiac indicators involving the correlation between BP and ECG has attracted significant attention, with studies concerning the cardiovascular system being frequently reported. [6] In addition, heart health has also been predicted using the correlation between muscle contractionrelated electromyogram (EMG)/mechanomyogram (MMG) and heart rate-related BP/ECG, which are biosignals related to muscle movements. [7] When muscle contractions occur under different environments, the fluctuations in the blood flow cause variations in the pulse, BP, and ECG; consequently, the measured data may be inaccurate, resulting in an inaccurate diagnosis. Therefore, diagnosing heart disease based on the strong correlation between biophysical signals can serve as a highly effective and reliable method. In addition, measuring these biophysical signals at a single part of the body using a multimodal sensor is desirable for ensuring stable and accurate readings.Interestingly, BP and ECG exhibit slow adapting (SA) response characteristics, whereas EMG and MMG show rapid The human cutaneous sensory organ is a highly evolved biosensor that is efficient, sensitive, selective, and adaptable. Recently, with the development of various materials and structures inspired by sensory organs, artificial cutaneous sensors have been widely studied. In this study, the acquisition of biophysical signals is demonstrated at one point on the body using a wearable all-gel-integrated multimodal sensor composed of four element sensors, inspired by the slow/rapid adapting functions of the skin sensory receptors. The gel-type sensors ensure flexibility, compactness, portability, adherence, and integrity. The wearable all...

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Impact of phase difference between cardiac systole and skeletal muscle contraction on hemodynamic response during electrically-induced muscle contractions

Cited by 13 publications

References 21 publications

Cardiac cycle-synchronized electrical muscle stimulator for lower limb training with the potential to reduce the heart's pumping workload

Cardiac cycle-synchronized electrical muscle stimulator for lower limb training with the potential to reduce the heart's pumping workload

Evidence of an association between cardiac-locomotor synchronization and lower leg muscle blood perfusion during walking

A Wearable All‐Gel Multimodal Cutaneous Sensor Enabling Simultaneous Single‐Site Monitoring of Cardiac‐Related Biophysical Signals

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