Multipoint surface electromyography measurement using bull's-eye electrodes for wide-area topographic analysis.

Background: Surface electromyography (sEMG) is primarily used to analyze individual and neighboring muscle activity. However, using a broader approach can enable simultaneous measurement of multiple muscles, which is essential for understanding muscular coordination. Using the "bull's-eye electrode," which allows bipolar derivation without directional dependence, enables wide-area multipoint sEMG measurements.

[A Case of Suspected Non-Occlusive Mesenteric Ischemia following Neoadjuvant Chemotherapy for Esophageal Cancer with an Extremely Poor Prognosis].

Non-occlusive mesenteric ischemia(NOMI)is defined as intestinal ischemia or necrosis with patency of the mesenteric arteries. Here, we report a case of suspected NOMI following neoadjuvant chemotherapy for esophageal cancer with an extremely poor prognosis. A 79-year-old man complained of weight loss and vomiting.

Relationship between anxiety and monotonous task performance in response to local cooling: an experimental study in healthy young men.

There are limited studies on monotonous task performance and its relationship with anxiety and stress traits. This study aimed to determine if local cooling exerts physiological effects and positively affects task performance. Ten male participants performed monotonous work for 24 min under control and local cooling conditions.

A wearable lower extremity support for laparoscopic surgeons: A pilot study.

Surgeons have increased physical stress during laparoscopic surgery due to operative site constraints. We developed a wearable device to reduce the physical stress on surgeons' lower extremities. The device mechanically facilitates maintaining a near-upright posture.

Determining how different levels of indoor carbon dioxide affect human monotonous task performance and their effects on human activation states using a lab experiment: a tracking task.

Different individuals respond differently to carbon dioxide (CO) levels in the local atmosphere. We aimed to determine whether brain activity changes with various CO concentrations and whether this is correlated with heart rate and arterial oxygen saturation (SPO). We used electrocardiograms, SPO measurements, electroencephalograms, and task performance metrics in various CO concentrations and studied the changes in these metrics.

What is the significance of the traditional pinching mode of holding chopsticks?

Background: The purpose of this study was to clarify the influence of manipulation mode of chopsticks on the learning process, using assessment of task performance and electromyography, and to understand the significance of the traditional manipulation mode from the viewpoint of physiological anthropology. Previous studies have described two modes of manipulating chopsticks, the traditional pincers-pinching mode and the scissors-pinching mode.

Methods: We conducted experiments with two conditions of holding chopsticks: scissors mode and pincers mode.

Correction to: Effect of simultaneous exposure to extremely short pulses of blue and green light on human pupillary constriction.

Following publication of the original article [1], the authors reported that the abstract was missing from this article.

A standing posture support device that reduces laparoscopic surgeons' occupational lower limb stress.

Background: We developed a surgical knee rest (SKR) that can be used to decrease the stress placed on the lower half of the body when surgeons work in the standing position. We tested the effectiveness of this device in the context of laparoscopic surgery.

Material And Methods: Five healthy, right-handed male surgeons participated, and we recorded surface electromyography (sEMG) signals from the two heads of the left and right gastrocnemius (Gc) muscles during laparoscopic resections of colorectal cancer.

Subadditive responses to extremely short blue and green pulsed light on visual evoked potentials, pupillary constriction and electroretinograms.

Background: The simultaneous exposure to blue and green light was reported to result in less melatonin suppression than monochromatic exposure to blue or green light. Here, we conducted an experiment using extremely short blue- and green-pulsed light to examine their visual and nonvisual effects on visual evoked potentials (VEPs), pupillary constriction, electroretinograms (ERGs), and subjective evaluations.

Methods: Twelve adult male subjects were exposed to three light conditions: blue-pulsed light (2.

Human pupillary light reflex during successive irradiation with 1-ms blue- and green-pulsed light.

Background: In the human retina, the contribution of intrinsically photosensitive retinal ganglion cells (ipRGCs) to the regulation of the pupillary response remains poorly understood. The objective of the current study was to determine the response dynamics of the pupillary light reflex to short, successive pulses of light. In order to better assess the roles of ipRGCs and cones, we used pulses of blue and green light.

Effect of quantity and intensity of pulsed light on human non-visual physiological responses.

Background: Exposure to pulsed light results in non-visual physiological responses in humans. The present study aims to investigate whether such non-visual effects are influenced to a greater extent by the intensity of lighting or by the power (quantity) of lighting.

Methods: >Twelve healthy young male participants (23 ± 0.

THE INFLUENCE OF LATERALITY ON DIFFERENT PATTERNS OF ASYMMETRICAL FOOT PRESSURE AND MUSCLE ACTIVATION DURING A GAIT CYCLE IN MANUAL PUSHING.

This study investigated laterality of manual pushing during a gait cycle by measuring pushing force, muscular activation and foot pressure. Subjects were 17 healthy young adult males; (11 right-handed [RH], and 6 left-handed [LH]). They pushed a force plate while walking on a treadmill at 1.

Effects of horizontal console position on operator muscular stress during cardiac ultrasonic diagnosis.

Ultrasound examinations tend to put sonographers in unnatural postures, which may lead to musculoskeletal disorders. In order to address this issue, in this study, we focused on the horizontal position of the console of a diagnostic ultrasound system to quantitatively assess the influence of the work plane position on musculoskeletal stress cardiac ultrasonic diagnosis in the bed-sitting position. Five subjects were asked to simulate a scanning task that involved touching five points on the console, setting the work plane at different positions in the space.

Ergonomic design and evaluation of the handle for an endoscopic dissector.

The purpose of this study was to design an endoscopic dissector handle and objectively assess its usability. The handles were designed with increased contact area between the fingers and thumb and the eye rings, and the eye rings were modified to have a more perpendicular insertion angle to the finger midline. Four different handle models were compared, including a conventional product.

Ergonomic design and evaluation of new surgical scissors.

Unlabelled: The purpose of this study is to design a new surgical scissors handle and determine its effectiveness with various usability indices. A new scissors handle was designed that retains the professional grip but has the shapes of the eye rings modified to fit the thumb and ring finger and finger rests for the index and little finger. The newly designed scissors and traditional scissors were compared by electromyography, subjective evaluation and task performance in experiments using cutting and peeling tasks.

Verification of impact of morning showering and mist sauna bathing on human physiological functions and work efficiency during the day.

Recently, a growing number in Japan are switching to taking baths in the morning (morning bathing). However, the effects of the morning bathing on human physiological functions and work efficiency have not yet been revealed. Then, we hypothesized that the effect of morning bathing on physiological functions would be different from those of night bathing.

Effects of horizontal console position on operator muscular stress during abdominal ultrasonic diagnosis.

Ultrasound examinations may require sonographers to adopt unnatural postures, which can lead to musculoskeletal disorders. We previously assessed the effect of a vertical operation panel on muscular stress. In this study, we focused on the horizontal positioning of the control panel of a diagnostic ultrasound system to quantitatively assess the influence of work plane position on musculoskeletal stress during scanning.

Effects of a vertical console position on operator muscular stress during ultrasonic diagnosis.

Ultrasound examinations tend to put sonographers in unnatural postures, which may lead to musculoskeletal disorders. In this study, we focused on the height of the operation panel of the diagnostic ultrasound system to quantitatively assess the effects of panel height (work plane height) on musculoskeletal stress during scanning in a sitting position. Eight subjects were asked to perform a simulated scanning task that involved touching nine points on the operation panel at four different panel heights.

Sustaining biological welfare for our future through consistent science.

Physiological anthropology presently covers a very broad range of human knowledge and engineering technologies. This study reviews scientific inconsistencies within a variety of areas: sitting posture; negative air ions; oxygen inhalation; alpha brain waves induced by music and ultrasound; 1/f fluctuations; the evaluation of feelings using surface electroencephalography; Kansei; universal design; and anti-stress issues. We found that the inconsistencies within these areas indicate the importance of integrative thinking and the need to maintain the perspective on the biological benefit to humanity.

Physiological functions of the effects of the different bathing method on recovery from local muscle fatigue.

Background: Recently, mist saunas have been used in the home as a new bathing style in Japan. However, there are still few reports on the effects of bathing methods on recovery from muscle fatigue. Furthermore, the effect of mist sauna bathing on human physiological function has not yet been revealed.

Effects of blue pulsed light on human physiological functions and subjective evaluation.

Background: It has been assumed that light with a higher irradiance of pulsed blue light has a much greater influence than that of light with a lower irradiance of steady blue light, although they have the same multiplication value of irradiance and duration. We examined the non-visual physiological effects of blue pulsed light, and determined whether it is sensed visually as being blue.

Findings: Seven young male volunteers participated in the study.

Physiological responses at short distances from a parametric speaker.

In recent years, parametric speakers have been used in various circumstances. In our previous studies, we verified that the physiological burden of the sound of parametric speaker set at 2.6 m from the subjects was lower than that of the general speaker.

Verification of endocrinological functions at a short distance between parametric speakers and the human body.

Objective: In recent years, a new type of speaker called the parametric speaker has been used to generate highly directional sound, and these speakers are now commercially available. In our previous study, we verified that the burden of the parametric speaker was lower than that of the general speaker for endocrine functions. However, nothing has yet been demonstrated about the effects of the shorter distance than 2.