scholarly journals Effect of smoking on visual evoked potential (VEP) and visual reaction time (VRT)

2020 ◽  
Vol 11 (2) ◽  
pp. 9-13
Author(s):  
Karishma Rajbhandari Pandey ◽  
Dipesh Raj Panday ◽  
Nirmala Limbu ◽  
Bhupendra Shah ◽  
Kopila Agarwal
Keyword(s):  
Reaction Time ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Smoking Status ◽  
Statistical Significance ◽  
Visual Reaction Time ◽  
Significant Difference ◽  
Visual Reaction ◽  
Pattern Vep ◽  
Visual Evoked

Background: Nicotine in tobacco smoke causes demyelination. Again, hypoxia in long-term smokers is linked to neuropathy. Visual receptors are early sufferer of neuropathy. Visual-Acuity & other ocular tests often fail to detect subtle changes of neuropathy which, however, can be detected by VEP test. Literature review shows that changes in VEP come earlier than PFT changes in smokers. Ironically, smokers claim that smoking improves their reaction time, which can be assessed by VRT. Aims and Objective: To relate smoking status with VEP and VRT. Materials and Methods: Fifty-six subjects (smoker group = 28 & non-smoker group = 28), whose age & sex were matched, were included in the study. Their PFT, pattern VEP of both eyes & VRT were recorded. The data were compared between the two groups using unpaired t-test, considering statistical significance at p<0.05. Results: The FVC (4.35±0.83 vs. 5.32+1.18 l, p=0.022), FEF 25% (7.40+2.38 vs. 8.74+3.90 l/s, p=0.019) & FEF 50% (6.11+1.52 vs. 7.74+2.57, p= 0.010) were significantly lower in smokers compared to nonsmokers. There was no significant difference in P100 wave latency of VEP. But, VRT of smokers were significantly shorter (431.69+60.29 vs. 441.14+123.54 ms, p=0.010). Conclusion: Smokers have shorter visual reaction time and similar visual evoked potential as compared to non-smokers.

scholarly journals The Effect of Different Learning Method on the Visual Reaction Time of Hand and Leg in High School Level Tennis Trainees

2020 ◽  
Vol 6 (2) ◽  
pp. 414
Author(s):  
Yahya Yıldırım ◽  
Ali Kızılet
Keyword(s):  
High School ◽  
Reaction Time ◽  
Statistical Significance ◽  
T Test ◽  
School Level ◽  
Visual Reaction Time ◽  
High School Level ◽  
Significant Difference ◽  
Visual Reaction ◽  
Post Test

The aim of this study is; to investigate the effects of differential training method on hand and leg visual reaction time in high school tennis trainees. 24 trainees (12 girls, 12 boys) attending a tennis course in a high school participated in the study voluntarily. It was determined that the mean age of the participants was 15.00±0.00 years, their body weight was 63.46±10.64 kg, their height was 1.65±0.06 m, and their body mass index was 23.26±2.91. According to the results of the pre-tests, 2 homogeneous groups of 12 people were created. One group formed the Differential Group (DG), the other the Traditional Group (TG), and each group included 6 girls and 6 boys. The training sessions were held 3 days a week (90 minutes each) and lasted 10 weeks in total. In the study, the visual reaction time (separately for hand and leg) was performed as a pre-test and a post-test using the Fitlight TrainerTM device. Paired Sample t test was used to examine the difference between pre-test and post-test of the same group. Independent Sample t test was used to measure the intergroup interaction between pre-tests and post-tests. To interpret the statistical significance level, p < 0.05 was accepted. As a conclusion; it was observed that both training methods shorten the visual reaction time, but there was no significant difference between the groups in pre-test and post-tests.

scholarly journals Pattern Visual Evoked Potential Changes in Diabetic Patients without Retinopathy

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Ozgur Balta ◽  
Gulten Sungur ◽  
Mehmet Yakin ◽  
Nurten Unlu ◽  
Oyku Bezen Balta ◽  
...  
Keyword(s):  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Diabetes Duration ◽  
Diabetic Patients ◽  
Check Size ◽  
P100 Latency ◽  
Pattern Visual Evoked Potential ◽  
Significant Difference ◽  
Hba1c Levels ◽  
Visual Evoked

Purpose.To assess the different check sizes of pattern visual evoked potential (PVEP) in diabetic patients without retinopathy according to HbA1c levels and diabetes duration.Methods.Fifty-eight eligible patients with type 2 diabetes mellitus and 26 age- and sex-matched healthy controls were included in the study. Only the right eye of each patient was analyzed. All of the patients underwent a comprehensive ophthalmic examination, and the PVEPs were recorded.Results.There was a statistically significant difference in P100 latency in 1-degree check size and in N135 latency in 2-degree check size between controls and patient groups which have different HbA1c levels. There were statistically significant, positive, and weak correlations with diabetes duration and P100 latency in 7-minute and 15-minute check sizes and N135 latency in 15-minute check size.Conclusions.It was showed that there were prolongations in P100 latency only in 1-degree check size and in N135 only in 2-degree check size in diabetic patients without retinopathy. There was statistically significant correlation between diabetes duration and P100 and N135 latencies in different check sizes.

scholarly journals Evaluation of Retinal Nerve Fiber Layer Thickness, Electroretinogram and Visual Evoked Potential in Patients with Alzheimer’s Disease

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Qi Zhe Ngoo ◽  
Wan Hazabbah Wan Hitam ◽  
Asrenee Ab Razak
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Pattern Electroretinogram ◽  
Mean Amplitude ◽  
Rnfl Thickness ◽  
Significant Difference ◽  
The Mean ◽  
Visual Evoked

Objective. To study the retinal nerve fibre layer (RNFL) thickness and visual electrophysiology testing in patients with Alzheimer’s disease (AD). Methods. A cross-sectional, hospital-based study: 25 AD subjects and 25 controls were recruited. Candidates who fulfil the criteria with normal ocular examinations were made to proceed with scanning laser polarimetry, pattern electroretinogram (PERG), and pattern visual evoked potential (PVEP) examinations of the right eye. RNFL thickness, PERG, and PVEP readings were evaluated. Results. In AD, the mean of average RNFL thickness was 45.28 μm, SD = 3.61, P<0.001 (P<0.05), while the superior RNFL thickness was 54.44 μm, SD = 2.85, P<0.001 (P<0.05) and inferior RNFL thickness was 47.11 μm, SD = 4.52, P<0.001 (P<0.05). For PERG, the mean P50 latency was 63.88 ms, SD = 7.94, P<0.001 (P<0.05) and the mean amplitudes of P50 waves were 1.79 μV, SD = 0.64, P<0.001 (P<0.05) and N95 waves were 2.43 μV, SD = 0.90, P<0.001 (P<0.05). For PVEP, the mean latency of P100 was 119.00 ms, SD = 9.07, P<0.001 (P<0.05), while the mean latency of N135 was 145.20 ms, SD = 8.53, P<0.001 (P<0.05). The mean amplitude of P100 waves was 3.71 μV, SD = 1.60, P<0.001 (P<0.05), whereas the mean amplitude of N135 waves was 3.67 μV, SD = 2.02, P<0.001 (P<0.05). RNFL thickness strongly correlates with PERG readings, with P50 latency R = 0.582, R2 = 0.339, P=0.002 (P<0.05), amplitude of P50 wave at R = 0.749, R2 = 0.561, P≤0.001 (P<0.05), and amplitude of N95 wave at R = 0.500, R2 = 0.250, P=0.011 (P<0.05). No significant difference and correlation were observed on PVEP readings. Conclusion. The mean of the average, superior and inferior RNFL thickness were significantly lower in the AD group compared with control. There is also significant difference of PERG and PVEP parameters between AD and controls. Regression analysis showed average RNFL thickness having significantly linear relationship with the PERG parameters.

scholarly journals Pattern Reversal Visual Evoked Potential and Cognitive Functions in Subclinical Hypothyroid Subjects

2016 ◽  
Vol 07 (S 01) ◽  
pp. S046-S051
Author(s):  
Pooja Jaiswal ◽  
Yogesh Saxena ◽  
Rani Gupta ◽  
Rajeev Mohan Kaushik
Keyword(s):  
Cognitive Functions ◽  
Visual Evoked Potential ◽  
Evoked Potential ◽  
Electrophysiological Study ◽  
Thyroid Stimulating Hormone ◽  
Pattern Reversal ◽  
Cross Sectional ◽  
Mean Values ◽  
Significant Difference ◽  
Visual Evoked

ABSTRACT Background: Central nervous system (CNS) involvement is insidious and may occur early in subclinical hypothyroid (SCH) state which can be picked up by electrophysiological study. This study aims to record visual evoked potential (VEP), event-related latency and cognitive functions, and find their association with the levels of serum thyroid-stimulating hormone (TSH) in patients with SCH. Materials and Methods: In this cross-sectional study, 36 adult SCH patients and an equal number of age- and sex-matched euthyroid controls were included. Pattern reversal VEP, visual reaction time (RT), digit spanning test, and AB clock test (ABCT) were done in both SCH cases and euthyroid controls. The observed values were analyzed for comparison of mean values between the groups and correlation of recorded variables with the levels of serum TSH. Results: SCH cases showed a higher P100 (VEP) latency in both the right (103.2 ± 12.3 vs. 102.7 ± 6.8 ms) and left eye (101.1 ± 9.1 vs. 96.2 ± 10.7 ms) as compared to controls, but the difference was statistically insignificant. A significant delay in RT was observed on visible spectra of light in SCH cases (P < 0.001). Digit spanning score (forward and backward) in SCH cases was significantly lower than controls (P < 0.001), and a lower standardized score (<124 or <95th percentile) was significantly associated with SCH state (P = 0.027). No significant difference was observed in visuospatial domain by ABCT between both the groups although the median score was lower in SCH cases. Only digit spanning score showed a significant negative correlation with TSH levels (r = −0.4; P = 0.001). Conclusion: Decline in working memory and RT to visual stimuli is an evidence of the involvement of CNS in SCH. Prolonged latency in VEP may depend on the duration of SCH.

scholarly journals DIFFERENCES IN VISUAL REACTION CHARACTERISTICS IN NATIONAL LEVEL CADET AND JUNIOR FEMALE HANDBALL PLAYERS

2019 ◽  
pp. 069 ◽  
Author(s):  
Stefan Marković ◽  
Zoran Valdevit ◽  
Marta Bon ◽  
Ljubomir Pavlović ◽  
Jelena Ivanović ◽  
...  
Keyword(s):  
Reaction Time ◽  
National Level ◽  
General Level ◽  
Data Sampling ◽  
Visual Reaction Time ◽  
Team Members ◽  
Factorial Anova ◽  
Significant Difference ◽  
Visual Reaction ◽  
Post Hoc

This paper aims to define differences in Simple Visual Reaction Time (SVRT) and Reaction Time Variation (RTV), related to age and player position in Serbian female cadet and junior national handball team members. The method used in this research was laboratory testing. All data sampling was performed using specially designed testing software that recorded visual reaction time with 1 ms precision. SVRT was expressed in ms, and RTV was expressed as a coefficient of variation percentage value. The overall sample consisted of 34 players - 19 cadets and 15 juniors. Mean SVRT of 194.28±16.55 and 184.73±16.68 ms was determined in the subsamples of cadet and junior players, respectively. It was found that cadets have a mean RTV of 4.74±2.41% while juniors have a mean RTV of 7.90±3.70%. Results of the Factorial ANOVA have shown that there are no general, statistically significant, differences in SVRT in relation to age, player position, and interaction of these factors (p>0.05). Statistically significant difference in RTV on a general level was found in relation to age (F=9.752, p=0.005), while differences in relation to player position or combination of these factors were not statistically significant (p>0.05). Post hoc tests have shown partial differences in relation to player position. The method of mathematical modelling was used to define the statistical model of performance in relation to the given variables. The final form of the model explained 100% of the measured variance (AdjR2 = 1.000), which implies its absolute predictive potential considering the characteristics of the sample.

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