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Correlation between critical force and critical velocity and their respective stroke rates
Luiz Augusto Buoro Perandini,Nilo Massaru Okuno,Eduardo Kokubun,Fábio Yuzo Nakamura
Revista Brasileira de Cineantropometria e Desempenho Humano , 2006,
Abstract: The critical power model has been utilized to estimate the anaerobic and aerobic capacities in swimming. There are studies which evidence the applicability of swimming velocity, force during tethered swimming and stroke rate data to the critical power model. However, the relationship among these estimates derived from freestyle and tethered swimming needs to be established. Therefore, the aim of this study was to evaluate the relationship between critical force (FCRIT) obtained from tethered swimming and critical velocity (VCRIT) during freestyle swimming (VCRIT), and their respective critical stroke rates (FBrCRIT). Eleven swimmers of both sexes (16.6 ± 1.3 years, 60 ± 10 kg, 172 ± 8 cm) underwent maximal tests to exhaustion in the tethered system and to as fast as possible trials during 200 and 400 m freestyle swimming. There were estimates of: 1) FCRIT and CIAnaer fi tting the three known equations derived from the critical power model (hyperbolic forcetime F-t, linear force-1/time F-1/t, linear impulse-time I-t); 2) VCRIT and CNAnaer during the freestyle tests using the linear distance-time relationship (d-t) and; 3) FBrCRIT and CBrAnaer during both kinds of tests (tethered and freestyle). The tethered performance data presented a good fi tting to the critical power model: FCRIT (R2 of 0.98, 0.97 and 0.99) and FBrCRIT-TETHERED (R2 of 0.96, 0.90 and 0.99). There was a high correlation between VCRIT and FCRIT (r= 0.89-0.91). Nevertheless, there was no signifi cant correlation among the estimates of FBrCRIT-TETHERED and FBrCRIT-FREESTYLE, neither among the anaerobic variables. These results indicate that FCRIT can be considered a reliable aerobic capacity index. However, the FBrCRIT-TETHERED did not approach this capacity, despite the good fi tting to the critical power model. RESUMO O modelo da potência crítica tem sido utilizado para estimar a capacidade anaeróbia e aeróbia na nata o. Há estudos demonstrando que a velocidade de nado livre, for a no nado atado e freqüência de bra adas aderem ao modelo da potência crítica. Entretanto, a rela o entre essas estimativas no nado livre e atado necessita ser elucidada. Assim, o objetivo do estudo foi avaliar a rela o entre a for a crítica (FCRIT) no nado atado e a velocidade crítica (VCRIT) em nado livre e as respectivas freqüências críticas de bra ada (FBrCRIT). Onze nadadores de ambos os sexos (16,6 ± 1,3 anos, 60 ± 10 kg, 172 ± 8 cm) foram submetidos à nata o atada até a exaust o e esfor os máximos livres em 200 e 400 m. Foram estimados: 1) FCRIT e CIAnaer através três equa es do modelo de potência c
Correlation between brain injury and dysphagia in adult patients with stroke  [cached]
Nunes, Maria Cristina de Alencar,Jurkiewicz, Ari Leon,Santos, Rosane Sampaio,Furkim, Ana Maria
International Archives of Otorhinolaryngology , 2012,
Abstract: Introduction: In the literature, the incidence of oropharyngeal dysphagia in patients with cerebrovascular accident (AVE) ranges 20-90%. Some studies correlate the location of a stroke with dysphagia, while others do not. Objective: To correlate brain injury with dysphagia in patients with stroke in relation to the type and location of stroke. Method: A prospective study conducted at the Hospital de Clinicas with 30 stroke patients: 18 women and 12 men. All patients underwent clinical evaluation and swallowing nasolaryngofibroscopy (FEES ), and were divided based on the location of the injury: cerebral cortex, cerebellar cortex, subcortical areas, and type: hemorrhagic or transient ischemic. Results: Of the 30 patients, 18 had ischemic stroke, 10 had hemorrhagic stroke, and 2 had transient stroke. Regarding the location, 10 lesions were in the cerebral cortex, 3 were in the cerebral and cerebellar cortices, 3 were in the cerebral cortex and subcortical areas, and 3 were in the cerebral and cerebellar cortices and subcortical areas. Cerebral cortex and subcortical area ischemic strokes predominated in the clinical evaluation of dysphagia. In FEES , decreased laryngeal sensitivity persisted following cerebral cortex and ischemic strokes. Waste in the pharyngeal recesses associated with epiglottic valleculae predominated in the piriform cortex in all lesion areas and in ischemic stroke. A patient with damage to the cerebral and cerebellar cortices from an ischemic stroke exhibited laryngeal penetration and tracheal aspiration of liquid and honey. Conclusion: Dysphagia was prevalent when a lesion was located in the cerebral cortex and was of the ischemic type.
Erectile Dysfunction in Older Male Stroke Patients: Correlation between Side of Hemiplegia and Erectile Function
L Sikiru, H Shmaila, GS Yusuf
African Journal of Reproductive Health , 2009,
Abstract: This study was conducted to determine the effects of hemiplegia on erectile function in stroke patients. One hundred and five stroke patients grouped into left (61.78±7.79 years) and 55 right hemiplegic (62.11 ± 9.32 years) and 40 age-matched controls (64.00± 8.53 years).The International Index of Erectile Function questionnaire was used for data collection. One way analysis of variance and Spearman correlation tests were used in data analysis. Erectile function was significantly decreased in the both right (IIEF-5, 7.55 ± 4.07) and left hemiplegic groups (IIEF-5, 10.40 ± 5. 70) compared with the control group (IIEF-5, 20.50 ±4.2 7) p<0.05. Side of hemiplegia significantly correlated with erectile dysfunction at p<0.01. Conclusively, stroke mostly affects erectile function of right hemiplegia (Afr J Reprod Health 2009; 13[2]:49-54).
Correlation between Climate Factors and Vegetation Cover in Qinghai Province, China  [PDF]
Yousif Elnour Yagoub, Zhongqin Li, Omer Said Musa, Muhammad Naveed Anjum, Feiteng Wang, Yanqun Bi, Bo Zhang
Journal of Geographic Information System (JGIS) , 2017, DOI: 10.4236/jgis.2017.94025
The Qinghai Province, situated in the northwest of China, is experiencing a continuous warming which is approximately three times more than the rate of global warming. This ongoing warming has a direct connection to vegetation cover, with significant societal and economic impacts in this region. In the present study, we investigate the correlation between climate change and vegetation cover in Qinghai Province. Analysis shows that in the Qinghai Province, order of NDVI is highest in summer followed by autumn, spring and winter. By calculating the average annual and seasonal-NDVI values, it is deduced that the main type of vegetation cover in the Qinghai Province has an upward trend at the rate of 0.013/10a, 0.016/10a, 0.035/10a and 0.058/10a for annual, winter, spring and summer, respectively. While a downward trend at a rate of 0.056/10a is present in autumn-NDVI. At the 0.01% significance level, a significant positive relationship of winter-NDVI with mean winter precipitation and temperature is revealed. Mean NDVI of spring and autumn show a significant positive relationship with respective seasonal mean precipitation. However, a significant difference is present between mean summer-NDVI and mean summer precipitation. Furthermore, mean NDVI of summer and autumn has a significant negative relationship with respective seasonal mean temperature.
Correlation between urinary incontinence and localization of brain lesion and severity of neurological lesion caused by a stroke  [cached]
Mihejeva I.,Vetra A.
SHS Web of Conferences , 2012, DOI: 10.1051/shsconf/20120200020
Abstract: Urinary incontinence is one of the medical problems, which may develop as a result of a stroke, and, according to several authors, its occurrence frequency may reach up to 80%. Clinical symptoms of urinary incontinence are considered to be one of the symptoms, which, along with the severity of the stroke and the level of functional limitations, allows to develop reliable predictions and to make targeted use of resources. Aim of the study, materials and methods. The aim of the study is to explore whether post-stroke urinary incontinence correlates with localization of lesion and clinical symptoms. The study includes 180 patients after a stroke, who have received treatment at Riga Eastern Clinic University Hospital Stroke Unit. All had a comprehensive clinical and functional assessment and cerebral computed tomography (CT). The examination took place at the hospital a few days after the stroke had occurred. Results. There are 180 participants to the study. Symptoms of urinary incontinence were reported for 70.6% of study participants. In 64% of cases new incontinence problems had developed, while in 6.5% of cases the previous symptoms of urinary incontinence (prior to the stroke) had worsened. The most common types of urinary incontinence in the acute period were urge and mixed incontinence (functional and urge incontinence). Patients with low Barthel Index showed higher frequency of urinary incontinence. A comparison of patient groups with and without symptoms of urinary incontinence showed that patients older than 75 years showed more symptoms of urinary incontinence (p = 0.013), and the same can be said about patients with low indicators of Barthel (p = 0.001) and patients with cognitive disorders (p = 0.001). Severity of paresis, aphasia and sensory disorders show a reliable correlation with the type of urinary incontinence. Conclusion. Symptoms of post-stroke urinary incontinence are linked both to a person's age, and functional and cognitive disorders. Urinary incontinence develops more frequently among patients with anterior circulation of the brain and subcortical brain lesion. There is a reliable correlation between severity of neurological lesion and urinary incontinence.
Urodynamics post stroke in patients with urinary incontinence: Is there correlation between bladder type and site of lesion?
Gupta Anupam,Taly Arun,Srivastava Abhishek,Thyloth Murali
Annals of Indian Academy of Neurology , 2009,
Abstract: Objective: Assessment of bladder by urodynamic study (UDS) in patients with urinary incontinence following stroke, and correlation with site of lesion. Study Design and Setting: Retrospective cross-sectional study in the neurological rehabilitation unit of a tertiary care institute. Materials and Methods: Forty patients (22 males) with arterial or venous, ischemic or hemorrhagic stroke, with urinary incontinence in the acute phase following the event, underwent UDS. Seventeen patients had right hemiplegia, 18 had left hemiplegia, and five had posterior circulation stroke with brainstem/cerebellar features. Bladder type was correlated with age, side, and site of lesion. Results: The mean age was 46.80 ± 16.65 years (range: 18-80 years). Thirty-six patients had arterial stroke and four had cortical venous thrombosis. UDS was performed after a mean of 28.32 ± 10.27 days (range: 8-53 days) after the stroke. All but one patient had neurogenic bladder dysfunction, with 36 patients (90%) having overactive detrusor (OD) and three having underactive/areflexic detrusor. Among the 36 patients with OD, 25 patients (62.5%) had OD without detrusor-sphincter dyssynergy (DSD) and 11 (27.5%) had OD with DSD. Bladder management was advised based on the UDS findings. No significant correlation ( P > 0.05) was found between type of bladder and age or side and site of lesion. Conclusions: UDS is a useful tool to assess and manage the bladder following stroke with urinary incontinence. In this study, no significant correlation was found between UDS findings and site of lesion.
Study on the correlation between traditional Chinese medicine syndrome and short-term prognosis of ischemic stroke using logistic regression model and repeated-measures analysis of variance  [cached]
Lu Liu
Zhong Xi Yi Jie He Xue Bao , 2012,
Abstract: OBJECTIVE: To investigate the correlation between traditional Chinese medicine (TCM) syndrome and short-term prognosis of ischemic stroke. METHODS: TCM syndrome factors and the neurological deficit degree of 464 patients with ischemic stroke were assessed using the Ischemic Stroke TCM Syndrome Factor Diagnostic Scale (ISTSFDS) and National Institutes of Health Stroke Scale (NIHSS) on the 1st, 7th and 14th day from the onset of ischemic stroke. Patients were assigned to the favorable short-term prognosis group and the unfavorable short-term prognosis group, depending on the NIHSS score on the 14th day after onset of stroke. The correlation between TCM syndrome factors and the short-term prognosis of ischemic stroke was studied using the logistic regression model. Then, the receiver operating characteristic (ROC) curves were used to evaluate the predicting capacity of logistic regression mode. Lastly, according to the results of the logistic regression model, the authors investigated the correlation between blood stasis syndrome and the neurological deficit degree of stroke with application of repeated-measures analysis of variance.RESULTS: Blood stasis syndrome (odds ratio=2.924, 95% confidence interval from 1.231 to 6.946, P=0.015) on the 14th day and NISSS score (odds ratio=1.956, 95% confidence interval from 1.701 to 2.250, P=0.000) on the 1st day after onset of stroke were risk factors that could predict short-term prognosis of ischemic stroke. The area under the ROC curves of the logistic regression model was 0.95. There was a tendency for stroke patients with blood stasis syndrome to have higher NIHSS scores than patients without blood stasis syndrome, and there was a decreased NIHSS score with time points delay.CONCLUSION: Blood stasis syndrome is a risk whose diagnosis could predict short-term prognosis of ischemic stroke. Clinically, the application of treatment focusing on activating blood and resolving stasis can improve the short-term prognosis of stroke patients. This study provides an evidence base for dynamic intervention of a comprehensive integrative medical treatment program based on syndrome differentiation for ischemic stroke.
A correlation between Earth's inclinations and the times of the cold events recorded in Devils Hole climate data  [PDF]
W. Woelfli,W. Baltensperger
Physics , 2002,
Abstract: The calculated values of Earth's inclinations during the cold events in the 500 kyr climate record of Devils Hole show a correlation: they cluster in the regions around 1 and 2 degrees. The Devils Hole record has been chosen, since it was dated by absolute methods. Other climate records covering the same period also have a reduced number of cold events between the two regions. The correlation lends support to the proposal of R. A. Muller and G.J. MacDonald that the observed 100 kyr climate cycle is due to the varying inclination of Earth's orbit and to material located near the invariant plane which shields off the solar radiation.
Correlation between AVHRR NDVI and climate factors
AVHRR NDVI与气候因子的相关分析

LI Ben Gang,

生态学报 , 2000,
Abstract: Based on 10 year monthly average AVHRR NDVI data and weather records collected from 160 stations all over China,the relationship between AVHRR NDVI and the climate factors including air temperature and rainfall was analyzed.The results showed significant correlation between the NDVI and the two climate factors and temperature was more influential than rainfall on the NDVI.It was also demonstrated that for natural vegetation,the NDNI/rainfall correlation coefficients decreased in an order of grass,shrub,and forest.The correlation coefficients of cultural land depended on a number of factors including agricultural practice,type of crops,seasonal variation in precipitation,especially irrigation pattern.
Topic-based Probabilistic Document Correlation Model

JIAXi-ping,PENG Hong,ZHENG Qi-lun,SHI Shi-xu,

计算机科学 , 2008,
Abstract: Existing models on document relationship analysis have a difficulty in learning document correlation from topic level.To overcome this difficulty,a topic-based probabilistic document correlation model(TPDC)was proposed.The model learns the topic structure of a document through the latent dirichlet allocation model,infers the posterior probability of a document by computing the posterior probability of its topics and topic similarity,and then constructs the document correlation model based on the document po...
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