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https://www.readbyqxmd.com/read/27900173/how-accurate-are-the-wrist-based-heart-rate-monitors-during-walking-and-running-activities-are-they-accurate-enough
#1
Sarah E Stahl, Hyun-Sung An, Danae M Dinkel, John M Noble, Jung-Min Lee
BACKGROUND: Heart rate (HR) monitors are valuable devices for fitness-orientated individuals. There has been a vast influx of optical sensing blood flow monitors claiming to provide accurate HR during physical activities. These monitors are worn on the arm and wrist to detect HR with photoplethysmography (PPG) techniques. Little is known about the validity of these wearable activity trackers. AIM: Validate the Scosche Rhythm (SR), Mio Alpha (MA), Fitbit Charge HR (FH), Basis Peak (BP), Microsoft Band (MB), and TomTom Runner Cardio (TT) wireless HR monitors...
2016: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/27890491/neural-pattern-similarity-between-contra-and-ipsilateral-movements-in-high-frequency-band-of-human-electrocorticograms
#2
Yusuke Fujiwara, Riki Matsumoto, Takuro Nakae, Kiyohide Usami, Masao Matsuhashi, Takayuki Kikuchi, Kazumichi Yoshida, Takeharu Kunieda, Susumu Miyamoto, Tatsuya Mima, Akio Ikeda, Rieko Osu
The cortical motor areas are activated not only during contralateral limb movements but also during ipsilateral limb movements. Although these ipsilateral activities have been observed in several brain imaging studies, their functional role is poorly understood. Due to its high temporal resolution and low susceptibility to artifacts from body movements, the electrocorticogram (ECoG) is an advantageous measurement method for assessing the human brain function of motor behaviors. Here, we demonstrate that contra- and ipsilateral movements share a similarity in the high-frequency band of human ECoG signals...
November 23, 2016: NeuroImage
https://www.readbyqxmd.com/read/27859579/sixty-hertz-stimulation-improves-bradykinesia-and-amplifies-subthalamic-low-frequency-oscillations
#3
REVIEW
Zack Blumenfeld, Mandy Miller Koop, Thomas E Prieto, Lauren A Shreve, Anca Velisar, Emma J Quinn, Megan H Trager, Helen Brontë-Stewart
BACKGROUND: The objective of this study was to investigate the hypothesis that attenuation of subthalamic nucleus (STN) alpha-/beta-band oscillations is causal to improvement in bradykinesia. METHODS: STN local field potentials from a sensing neurostimulator (Activa(®) PC+S; Medtronic, Inc.) and kinematics from wearable sensors were recorded simultaneously during 60- and 140-Hz deep brain stimulation (DBS) in 9 freely moving PD subjects (15 STNs) performing repetitive wrist flexion-extension...
November 8, 2016: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/27795550/circadian-timing-and-alignment-in-healthy-adults-associations-with-bmi-body-fat-caloric-intake-and-physical-activity
#4
K G Baron, K J Reid, T Kim, L Van Horn, H Attarian, L Wolfe, J Siddique, G Santostasi, P C Zee
INTRODUCTION: Disruption of circadian rhythms is one of the proposed mechanisms linking late sleep timing to obesity risk but few studies have evaluated biological markers outside of the laboratory. The goal of this study was to determine the relationship between the timing and alignment of melatonin and sleep onset (phase angle) with BMI, body fat and obesity related behaviors. We hypothesized that circadian alignment (relationship of melatonin to sleep timing) rather than circadian (melatonin) timing would be associated with higher BMI, body fat, dietary intake and lower physical activity...
October 31, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/27792176/wrist-pulse-rate-monitor-using-self-injection-locked-radar-technology
#5
Fu-Kang Wang, Mu-Cyun Tang, Sheng-Chao Su, Tzyy-Sheng Horng
To achieve sensitivity, comfort, and durability in vital sign monitoring, this study explores the use of radar technologies in wearable devices. The study first detected the respiratory rates and heart rates of a subject at a one-meter distance using a self-injection-locked (SIL) radar and a conventional continuous-wave (CW) radar to compare the sensitivity versus power consumption between the two radars. Then, a pulse rate monitor was constructed based on a bistatic SIL radar architecture. This monitor uses an active antenna that is composed of a SIL oscillator (SILO) and a patch antenna...
October 26, 2016: Biosensors
https://www.readbyqxmd.com/read/27764231/regression-model-based-walking-speed-estimation-using-wrist-worn-inertial-sensor
#6
Shaghayegh Zihajehzadeh, Edward J Park
Walking speed is widely used to study human health status. Wearable inertial measurement units (IMU) are promising tools for the ambulatory measurement of walking speed. Among wearable inertial sensors, the ones worn on the wrist, such as a watch or band, have relatively higher potential to be easily incorporated into daily lifestyle. Using the arm swing motion in walking, this paper proposes a regression model-based method for longitudinal walking speed estimation using a wrist-worn IMU. A novel kinematic variable is proposed, which finds the wrist acceleration in the principal axis (i...
2016: PloS One
https://www.readbyqxmd.com/read/27725721/time-course-of-coherence-in-the-human-basal-ganglia-during-voluntary-movements
#7
Omid Talakoub, Bogdan Neagu, Kaviraja Udupa, Eric Tsang, Robert Chen, Milos R Popovic, Willy Wong
We are interested in characterizing how brain networks interact and communicate with each other during voluntary movements. We recorded electrical activities from the globus pallidus pars interna (GPi), subthalamic nucleus (STN) and the motor cortex during voluntary wrist movements. Seven patients with dystonia and six patients with Parkinson's disease underwent bilateral deep brain stimulation (DBS) electrode placement. Local field potentials from the DBS electrodes and scalp EEG from the electrodes placed over the motor cortices were recorded while the patients performed externally triggered and self-initiated movements...
October 11, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27699128/unconstrained-pulse-pressure-monitoring-for-health-management-using-hetero-core-fiber-optic-sensor
#8
Michiko Nishiyama, Masako Sonobe, Kazuhiro Watanabe
In this paper, we present a pulse pressure waveform sensor that does not constrain a wearer's daily activity; the sensor uses hetero-core fiber optics. Hetero-core fiber sensors have been found to be sensitive to moderate bending. To detect minute pulse pressure changes from the radial artery at the wrist, we devised a fiber sensor arrangement using three-point bending supports. We analyzed and evaluated the measurement validity using wavelet transformation, which is well-suited for biological signal processing...
September 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27677025/a-closed-loop-bci-system-for-rehabilitation-of-the-hemiplegic-upper-limb-a-performance-study-of-the-systems-ability-to-detect-intention-of-movement
#9
Juliette Hurtier, Leh Van Dokkum, Sami Dalhoumi, Aodhan Coffey, Stéphane Perrey, Claire Jourdan, Gérard Dray, Tomas Ward, Jerôme Froger, Isabelle Laffont
OBJECTIVE: Rehabilitation of the upper-limb by means of a brain computer interface (BCI) is based on detecting an "intention to act" in the brain and transforming this intention into actual movement by using a motorized orthesis. The visual and proprioceptive feedback that results from the systems' generated movement following the subjects' captured intention, is thought to close the sensori-motor loop. Closing the loop is a key feature of BCI-systems that is thought to induce cerebral plasticity and thereby facilitating rehabilitation...
September 2016: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27501207/effect-of-acupressure-on-nausea-vomiting-in-patients-with-acute-myeloblastic-leukemia
#10
Hatice Sevil Avc, Nimet Ovayolu, Özlem Ovayolu
The aim of this study was to assess the effect of acupressure, applied at P6 (Neiguan) acupuncture point, on chemotherapy-induced nausea and vomiting in patients with acute myeloblastic leukemia. This was a randomized controlled trial conducted on patients with myeloblastic leukemia. A total of 90 patients, who received the same chemotherapy regimen and antiemetic therapy, were included in the study as 30 patients in the control group, 30 patients in the band group, and 30 patients in the pressure group. Although acupressure was applied by placing wristbands at P6 acupuncture point of both wrists in patients of the band group for totally 4 days, acupressure was applied with the use of finger pressure in patients of the pressure group for totally 4 days...
September 2016: Holistic Nursing Practice
https://www.readbyqxmd.com/read/27468369/interosseous-membrane-of-the-forearm
#11
Robert Matthias, Thomas W Wright
BACKGROUND: Injuries of the interosseous membrane (IOM) of the forearm are frequently unrecognized, difficult to treat, and can result in a devastating sequelae for the wrist and elbow. PURPOSE: The purpose of this review article is to evaluate the dignosis, biomechanics, clinical results, and propose a treatment approach to this rare complex entity. METHODS: The biomechanical and clinical literature is reviewed. A treatment approach is described based on the known biomechanics and clinical experience of the senior author (T...
August 2016: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/27455381/effects-of-muscle-fatigue-on-the-usability-of-a-myoelectric-human-computer-interface
#12
Alexander G Barszap, Ida-Maria Skavhaug, Sanjay S Joshi
Electromyography-based human-computer interface development is an active field of research. However, knowledge on the effects of muscle fatigue for specific devices is limited. We have developed a novel myoelectric human-computer interface in which subjects continuously navigate a cursor to targets by manipulating a single surface electromyography (sEMG) signal. Two-dimensional control is achieved through simultaneous adjustments of power in two frequency bands through a series of dynamic low-level muscle contractions...
October 2016: Human Movement Science
https://www.readbyqxmd.com/read/27250460/pulse-wave-detection-method-based-on-the-bio-impedance-of-the-wrist
#13
Jianman He, Mengjun Wang, Xiaoxia Li, Gang Li, Ling Lin
The real-time monitoring of pulse rate can evaluate the heart health to some extent, and the measurement of bio-impedance has the potential in wearable health monitoring system. In this paper, an effective method, which contains self-balancing bridge, flexible electrode, and high-speed digital lock-in algorithm (DLIA) with over-sampling, was designed to detect the impedance pulse wave at the wrist. By applying the self-balancing bridge, the basic impedance can be compensated as much as possible, and the low amplitude of impedance variation related to heart pulse can be obtained more easily...
May 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27244745/a-bci-system-based-on-somatosensory-attentional-orientation
#14
Lin Yao, Xinjun Sheng, Dingguo Zhang, Ning Jiang, Dario Farina, Xiangyang Zhu
We propose and test a novel brain-computer interface (BCI) based on imagined tactile sensation. During an imagined tactile sensation, referred to as somatosensory attentional orientation (SAO), the subject shifts and maintains somatosensory attention on a body part, e.g., left or right hand. The SAO can be detected from EEG recordings for establishing a communication channel. To test for the hypothesis that SAO on different body parts can be discriminated from EEG, 14 subjects were assigned to a group who received an actual sensory stimulation (STE-Group), and 18 subjects were assigned to the SAO only group (SAO-Group)...
May 24, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/27186061/reconstruction-of-the-elbow-and-forearm-for-ewing-sarcoma-of-ulna-a-new-biological-technique
#15
Ajay Puri, Ashish Gulia, Suman Byregowda, Vishnu Ramanujan
Primary bone tumors around the elbow represent <1% of all the skeletal tumors. Surgery with or without adjuvant therapy (radiotherapy, chemotherapy) is the treatment of choice for malignant tumors. Reconstruction of the elbow and forearm in malignant tumors is challenging as it involves a complex interplay between multiple joints which need to be stabilized for the optimal functional outcome. We describe a new technique for the reconstruction of the elbow after resection of a proximal ulna tumor with articular radio-ulnar synostosis with the creation of a single bone forearm...
April 2016: International Journal of Shoulder Surgery
https://www.readbyqxmd.com/read/27103999/efficacy-of-high-frequency-ultrasound-in-postoperative-evaluation-of-carpal-tunnel-syndrome-treatment
#16
Katarzyna Kapuścińska, Andrzej Urbanik
UNLABELLED: Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy and a frequent cause of sick leave because of work-related hand overload. The main treatment is operation. AIM: The aim of the study is to assess the usefulness of high frequency ultrasound in the postoperative evaluation of CTS treatment efficacy. MATERIAL AND METHODS: Sixty-two patients (50 women and 12 men aged 28-70, mean age 55.2) underwent surgical treatment of CTS...
March 2016: Journal of Ultrasonography
https://www.readbyqxmd.com/read/27064969/frequency-specific-synchronization-in-the-bilateral-subthalamic-nuclei-depending-on-voluntary-muscle-contraction-and-relaxation-in-patients-with-parkinson-s-disease
#17
Kenji Kato, Fusako Yokochi, Hirokazu Iwamuro, Takashi Kawasaki, Kohichi Hamada, Ayako Isoo, Katsuo Kimura, Ryoichi Okiyama, Makoto Taniguchi, Junichi Ushiba
The volitional control of muscle contraction and relaxation is a fundamental component of human motor activity, but how the processing of the subcortical networks, including the subthalamic nucleus (STN), is involved in voluntary muscle contraction (VMC) and voluntary muscle relaxation (VMR) remains unclear. In this study, local field potentials (LFPs) of bilateral STNs were recorded in patients with Parkinson's disease (PD) while performing externally paced VMC and VMR tasks of the unilateral wrist extensor muscle...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27023538/estimation-of-thermal-sensation-based-on-wrist-skin-temperatures
#18
Soo Young Sim, Myung Jun Koh, Kwang Min Joo, Seungwoo Noh, Sangyun Park, Youn Ho Kim, Kwang Suk Park
Thermal comfort is an essential environmental factor related to quality of life and work effectiveness. We assessed the feasibility of wrist skin temperature monitoring for estimating subjective thermal sensation. We invented a wrist band that simultaneously monitors skin temperatures from the wrist (i.e., the radial artery and ulnar artery regions, and upper wrist) and the fingertip. Skin temperatures from eight healthy subjects were acquired while thermal sensation varied. To develop a thermal sensation estimation model, the mean skin temperature, temperature gradient, time differential of the temperatures, and average power of frequency band were calculated...
2016: Sensors
https://www.readbyqxmd.com/read/26959025/piezoresistive-soft-condensed-matter-sensor-for-body-mounted-vital-function-applications
#19
Mark Melnykowycz, Michael Tschudin, Frank Clemens
A soft condensed matter sensor (SCMS) designed to measure strains on the human body is presented. The hybrid material based on carbon black (CB) and a thermoplastic elastomer (TPE) was bonded to a textile elastic band and used as a sensor on the human wrist to measure hand motion by detecting the movement of tendons in the wrist. Additionally it was able to track the blood pulse wave of a person, allowing for the determination of pulse wave peaks corresponding to the systole and diastole blood pressures in order to calculate the heart rate...
2016: Sensors
https://www.readbyqxmd.com/read/26874751/learning-to-modulate-the-partial-powers-of-a-single-semg-power-spectrum-through-a-novel-human-computer-interface
#20
Ida-Maria Skavhaug, Kenneth R Lyons, Anna Nemchuk, Shira D Muroff, Sanjay S Joshi
New human-computer interfaces that use bioelectrical signals as input are allowing study of the flexibility of the human neuromuscular system. We have developed a myoelectric human-computer interface which enables users to navigate a cursor to targets through manipulations of partial powers within a single surface electromyography (sEMG) signal. Users obtain two-dimensional control through simultaneous adjustments of powers in two frequency bands within the sEMG spectrum, creating power profiles corresponding to cursor positions...
June 2016: Human Movement Science
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