Tretriluxana, Suradej

Preferred name

Alternative Name

Tretriluxana, S.

Main Affiliation

School of Engineering

suradej.tr@kmitl.ac.th

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Feasibility investigation of the accelerated skill acquisition program (ASAP): Insights into reach-to-grasp coordination of individuals with postacute stroke
(2013-01-01)
Tretriluxana, Jarugool
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Runnarong, Nuttakarn
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Tretriluxana, Suradej
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Prayoonwiwat, Naraporn
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Vachalathiti, Roongtiwa
Background: Skill acquisition, capacity building, and motivational enhancements are the basis of the Accelerated Skill Acquisition Program (ASAP) and form the foundation for effective incorporation of the paretic upper extremity into life activities. This is the first phase I trial to deliver ASAP during the postacute interval in mildly to moderately impaired stroke survivors and to include an assessment of paretic reach-to-grasp (RTG) coordination using RTG task and cross-correlation analyses. Methods: Two baseline and posttreatment evaluations consisted of RTG actions, the Wolf Motor Function Test (WMFT), and the Stroke Impact Scale (SIS). An individualized arm therapy program using ASAP principles was administered for a total of 30 hours, 2 hours per day, for 2 to 4 days per week over 5 weeks. Dependent measures were kinematics of RTG actions, RTG coordination, total time score of WMFT, and stroke recovery score of SIS. Results: All participants tolerated ASAP well, and none reported any adverse effects during or after the protocol. When the 2 baseline evaluations were compared, there were no changes in any RTG kinematics or RTG coordination. In contrast, after 30 hours of ASAP, total movement time and deceleration time of RTG actions markedly decreased, maximum reach (transport) velocity strikingly increased, and time of maximum aperture was accomplished later. Additionally, the maximal RTG correlation coefficient increased with a shorter associated time lag. A similar pattern was observed for the clinical outcome measures of WMFT and SIS. Conclusions: The findings demonstrate the feasibility of using an ASAP protocol for patients 1 to 3 months post stroke. Under ASAP, WMFT tasks and RTG actions were performed faster with higher peak transport velocity and a more coordinated RTG pattern. The next step is to determine whether the immediate gains in the skilled RTG actions persist 6 months alter. © 2013 Thomas Land Publishers, Inc.
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A design of configurable ECG recorder module
(2011-12-01)
Punapung, Anucha
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Tretriluxana, Suradej
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Chitsakul, Kitiphol
A modular design of Electrocardiogram (ECG) acquisition system is presented. As a crucial part of the system, the Front-End module is made of a programmable, mixed-signal Application Specific Integrated Circuit (ASIC). This module is designed to satisfy the various forms of bioelectrical measurement with no hardware modification. Controlled by a 32-bit microcontroller, the prototype module recorded the simulated signal in two different standard ECG recording configurations, ten and six electrodes placements. Our study shows a good performance signal recording and the module is open to further developed. © 2011 IEEE.
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Comparison of Heart Rate statistical parameters from Photoplethysmographic signal in resting and exercise conditions
(2015-08-17)
Sengthipphany, T.
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Tretriluxana, S.
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Chitsakul, K.
The aim of this article is to investigate the possibility of computing Heart Rate Variability (HRV) indices from the finger Photoplethysmogram. To indicate that whether Pulse Rate Variability (PRV) from PPG signal can be used as an alternative to Heart Rate Variability (HRV) from ECG signal. The Photoplethsmographic (PPG) and Electrocardiographic (ECG) signals from 33 participants were recorded simultaneoussly during resting and exercise conditions. The peaks of PPG and R-waves of ECG were detected and reconstructed to the Peak-to-Peak interval (PPI) and R-to-R interval (RRI) waveforms respectively. In both conditions, the mean and standard deviation (SDNN) of the intervals over 5 minutes were computed from the two waveforms. Results from cross correlation between PPI and RRI show that the average correlation coefficients (r) are higher in resting than the 'r' in exercise. In regression analysis of the statistical parameters between RRI and PPI, the determination coefficients (R<sup>2</sup>) of the means are close to one in both conditions, whereas the R<sup>2</sup> of SDNN in exercise is lower than the one in resting. This finding suggests that the HRV indices can be evaluated from PPG with reliability during the rest.
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Brainwave spectrum analysis during paced breathing control: A pilot study
(2017-02-21)
Pakoktom, Nipawan
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Tretriluxana, Suradej
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Chitsakul, Kitiphol
Investigation of Electroencephalogram (EEG) has been made during the spontaneous breathing and paced breathing control (9 breaths/minute) conditions in eight young healthy college students (Male=4, Female=4). Their selected 5-minute EEG segments were transformed into 3 frequency bands (Delta Wave: 0.5-4Hz, Theta Wave: 4-8Hz and Alpha Wave: 8-13Hz). The power in each band were compared between two conditions. Our statistical tests show no significant differences between the two conditions in all three spectrums. This pilot study needs to be further analyzed to make a firm conclusion and a larger sample size is suggested.
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Analysis of Heart Rate Variability and Breath to Breath Interval in frequency domain
(2014-01-20)
Sengthipphany, Tick
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Tretriluxana, Suradej
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Chitsakul, Kitiphol
Respiratory is known to be a confounding factor of Heart Rate Variability (HRV) analysis. This article introduces a Breath-to-Breath Interval (BBI) spectral computation to investigate the insight between respiration and the HRV. Six males and five female volunteers (age 20-25 years) underwent the Electrocardiogram (ECG) and respiratory chest movement recordings for 5 minutes while sitting in resting condition. Auto Regressive Moving Average (ARMA) model was employed to the R-wave to R-wave interval (RRI) and BBI signals for the spectral analysis. The results from all participants demonstrate that the peak amplitude in high frequency (0.15-0.40 Hz) band are higher than the ones in low frequency (0.04-0.15 Hz) band in both RRI and BBI frequency plots. It suggests that respiratory plays a major role in HRV oscillation. Our further study is to develop a mathematical model to explain this finding.
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Differential effects of feedback in the virtual reality environment for arm rehabilitation after stroke
(2016-02-04)
Tretriluxana, Suradej
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Tretriluxana, Jarugool
Two types of augmented feedback (FB) were compared during reaching training in the Virtual Reality (VR) environment for chronic stroke patients. Six participants were assigned to receive either the Knowledge of Result (KR) or the Knowledge of Performance (KP) FB. They went through 12 training sessions, of which there were 75 Reach-to-Target trials in the VR. They were instructed to perform the actions as fast and accurate as possible. KR group were given audio feedback whereas KP group could see the hand path of their movement. To evaluate, the Wolf Motor Function Test (WMFT) were performed before (Baseline), after (Post training) and 1 week after (Post lweek) the training. Also the kinematics data, Total Movement Time (TMT), Peak Transport Velocity (VMax), and Relative timing of VMax (RP), were analyzed. Results show that only in KP group, the dexterity tasks of WMFT was improved after the training and maintained for at least 1 week. Additionally, VMax in KP group was higher and occurred later than that in KR group. These preliminary outcomes imply that different strategy of movement recovery after stroke result from different types of FB. More participants will be recruited in the future to confirm this finding.
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A development of real-Time fetal movement detector
(2016-01-01)
Norasethasopon, Pathara
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Chitsakul, Kitiphol
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Tretriluxana, Suradej
Fetal Movement (FM) is a marker for evaluating wellbeing of the unborn baby. Naturally, pregnant women can sense any movement in her abdomen. However, there are two groups of women who may have degraded this sensing ability. A primigravida, a first time pregnant woman, may not be able to recognize the fetus movement. A working pregnant woman may be too busy to aware of her fetus responses. In this paper, a development of real-Time fetus movement detector is presented. An air pressurized bag is designed to be wrapped around the abdomen of pregnant woman. It is connected to a pressure sensor in order to detect the force exerted against the uterus wall in any direction. The signal is processed before uploaded into internet cloud services for real-Time monitoring and remote access.
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Smart digital podoscope for foot deformity assessment
(2014-01-20)
Laowattanatham, Navaporn
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Chitsakul, Kittipol
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Tretriluxana, Suradej
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Hansasuta, Cherdpong
Foot deformity is a common problem among Thai people. It is resulted from various causes. The deformity may lead to pain and discomfort of feet and legs. The foot condition can be evaluated using plantar pressures and foot deformity measures, depending on the therapists. This paper presents a design of digital podoscope, a screening tool for patients with foot deformity. Built on a commercial optical scanners, our design is smaller than the camera based system. The scanned foot image is color-mapped by a software to calculate the foot index. The system was tested with twenty-five participants who have been diagnosed with foot abnormality. The data show a comparable results with the standard method. Our further study is to develop an algorithm for automatically assessing the deformity and calculating the foot index.
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The persisted effects of low-frequency repetitive transcranial magnetic stimulation to augment task-specific induced hand recovery following subacute stroke: Extended study
(2018-12-01)
Tretriluxana, Jarugool
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Thanakamchokchai, Jenjira
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Jalayondeja, Chutima
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Pakaprot, Narawut
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Tretriluxana, Suradej
Objective To examine the long-term effects of the low-frequency repetitive transcranial magnetic stimulation (LFrTMS) combined with task-specific training on paretic hand function following subacute stroke. Methods Sixteen participants were randomly selected and grouped into two: the experimental group (real LFrTMS) and the control group (sham LF-rTMS). All the 16 participants were then taken through a 1-hour taskspecific training of the paretic hand. The corticospinal excitability (motor evoke potential [MEP] amplitude) of the non-lesioned hemisphere, and the paretic hand performance (Wolf Motor Function Test total movement time [WMFT-TMT]) were evaluated at baseline, after the LF-rTMS, immediately after task-specific training, 1 and 2 weeks after the training. Results Groups comparisons showed a significant difference in the MEP after LF-rTMS and after the training. Compared to the baseline, the MEP of the experimental group significantly decreased after LF-rTMS and after the training and that effect was maintained for 2 weeks. Group comparisons showed significant difference in WMFT-TMT after the training. Only in the experimental group, the WMFT-TMT of the can lifting item significantly reduced compared to the baseline and the effect was sustained for 2 weeks. Conclusion The results of this study established that the improvement in paretic hand after task-specific training was enhanced by LF-rTMS and it persisted for at least 2 weeks.
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An insole point pressure monitoring system
(2011-12-01)
Numchaichanakij, Apisit
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Chitsakul, Kitiphol
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Tretriluxana, Suradej
Number of people who is suffering with plantar is increasing nowadays. Several causes such as diabetes mellitus, plantar fasciitis, changes in biomechanics, etc. may be diagnosed. Simple treatment, by an expert clinician, is such as inserting a custom-made insole into the patient's shoes for manipulating pressure to the right position. This work aims to develop plantar point pressure measurement, which is able to quantitatively estimate the total plantar point pressure in real-time. Based on piezoresistive sensor, pressure at the point of interest between before and after make custom insole could be determined. According to the preliminary test, the system is able to measure total plantar point pressure and give instant feedback to a user in real-time. © 2011 IEEE.

Tretriluxana, Suradej

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