scholarly journals Comparison of Spatio-Temporal Parameter and Symmetry during Gait between Healthy Elderly and Young People

2021 ◽  
Vol 5 (1) ◽  
pp. 27-33
Author(s):  
Kyue-Nam Park
Keyword(s):  
Young People ◽  
Temporal Parameter ◽  
Healthy Elderly ◽  
Spatio Temporal

scholarly journals Visual Attention and Aging: an Age-Related Cognitive Model of Positive Adaptation

2014 ◽  
Vol 4 (3) ◽  
pp. 181-191
Author(s):  
José Manuel Rodríguez-Ferrer
Keyword(s):  
Young People ◽  
Visual Attention ◽  
Response Times ◽  
Age Groups ◽  
Cognitive Model ◽  
Covert Attention ◽  
Positive Adaptation ◽  
Healthy Elderly ◽  
Age Related ◽  
Healthy Young People

We have studied the effects of normal aging on visual attention. Have participated a group of 38 healthy elderly people with an average age of 67.8 years and a group of 39 healthy young people with average age of 19.2 years. In a first experiment of visual detection, response times were recorded, with and without covert attention, to the presentation of stimuli (0.5º in diameter grey circles) appearing in three eccentricities (2.15, 3.83 and 5.53° of visual field) and with three levels of contrast (6, 16 and 78%). In a second experiment of visual form discrimination circles and squares with the same features as in the previous experiment were presented, but in this case subjects only should respond to the emergence of the circles. In both age groups, the covert attention reduced response times. Compared to young people, the older group achieved better results in some aspects of attention tests and response times were reduced more in the stimuli of greater eccentricity. The data suggest that there is a mechanism of adaptation in aging, in which visual attention especially favors the perception of those stimuli more difficult to detec

scholarly journals The effects of different frequencies of rhythmic acoustic stimulation on gait kinematics and trunk sway in healthy elderly population

2020 ◽  
Author(s):  
Roberta Minino ◽  
Emahnuel Troisi Lopez ◽  
Pierpaolo Sorrentino ◽  
Rosaria Rucco ◽  
Anna Lardone ◽  
...  
Keyword(s):  
Acoustic Stimulation ◽  
Elderly Subjects ◽  
Low Frequencies ◽  
Healthy Elderly ◽  
Gait Kinematics ◽  
Trunk Sway ◽  
Spatio Temporal ◽  
The Individual ◽  
Harmful Effects ◽  
Healthy Elderly Subjects

ABSTRACTThe use of rhythmic acoustic stimulation (RAS) in improving gait and balance in healthy elderly subjects has been widely investigated. However, methodologies and results are often controversial. In this study, we hypothesize that both the kinematic features of gait and stability, depend on the frequency at which RAS is administered. Our aim was to observe, through 3D Gait Analysis, the effect of different types of RAS (at a fixed frequency or based on the average cadence of each subject) on both gait spatio-temporal parameters and stability. The latter was estimated through an innovative measure, the trunk displacement index (TDI) that we have recently implemented. We observed that the low frequencies RAS led to a general slowdown of gait, which did not provide any clear benefit and produced harmful effects on stability when the frequency became too low compared to the individual natural frequency. On the contrary, the high frequencies of RAS showed a slight acceleration of gait, accompanied by better stability (as documented by a lower TDI value), regardless of the type of RAS. Finally, the RAS equal to the individual natural cadence also produced an increase in stability.

scholarly journals Construction of the Long-Term Global Surface Water Extent Dataset Based on Water-NDVI Spatio-Temporal Parameter Set

2020 ◽  
Vol 12 (17) ◽  
pp. 2675
Author(s):  
Qianqian Han ◽  
Zhenguo Niu
Keyword(s):  
Surface Water ◽  
Water Area ◽  
Temporal Parameter ◽  
Modis Ndvi ◽  
Water Index ◽  
Normalized Difference Water Index ◽  
Spatio Temporal ◽  
Global Surface ◽  
Global Water

Inland surface water is highly dynamic, seasonally and inter-annually, limiting the representativity of the water coverage information that is usually obtained at any single date. The long-term dynamic water extent products with high spatial and temporal resolution are particularly important to analyze the surface water change but unavailable up to now. In this paper, we construct a global water Normalized Difference Vegetation Index (NDVI) spatio-temporal parameter set based on the Moderate-resolution Imaging Spectroradiometer (MODIS) NDVI. Employing the Google Earth Engine, we construct a new Global Surface Water Extent Dataset (GSWED) with coverage from 2000 to 2018, having an eight-day temporal resolution and a spatial resolution of 250 m. The results show that: (1) the MODIS NDVI-based surface water mapping has better performance compared to other water extraction methods, such as the normalized difference water index, the modified normalized difference water index, and the OTSU (maximal between-cluster variance method). In addition, the water-NDVI spatio-temporal parameter set can be used to update surface water extent datasets after 2018 as soon as the MODIS data are updated. (2) We validated the GSWED using random water samples from the Global Surface Water (GSW) dataset and achieved an overall accuracy of 96% with a kappa coefficient of 0.9. The producer’s accuracy and user’s accuracy were 97% and 90%, respectively. The validated comparisons in four regions (Qinghai Lake, Selin Co Lake, Utah Lake, and Dead Sea) show a good consistency with a correlation value of above 0.9. (3) The maximum global water area reached 2.41 million km2 between 2000 and 2018, and the global water showed a decreasing trend with a significance of P = 0.0898. (4) Analysis of different types of water area change regions (Selin Co Lake, Urmia Lake, Aral Sea, Chiquita Lake, and Dongting Lake) showed that the GSWED can not only identify the seasonal changes of the surface water area and abrupt changes of hydrological events but also reflect the long-term trend of the water changes. In addition, GSWED has better performance in wetland areas and shallow areas. The GSWED can be used for regional studies and global studies of hydrology, biogeochemistry, and climate models.

scholarly journals Gait analysis comparing Parkinson's disease with healthy elderly subjects

2010 ◽  
Vol 68 (1) ◽  
pp. 81-86 ◽  
Author(s):  
Roberta de Melo Roiz ◽  
Enio Walker Azevedo Cacho ◽  
Manoela Macedo Pazinatto ◽  
Julia Guimarães Reis ◽  
Alberto Cliquet Jr ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Gait Analysis ◽  
Elderly Subjects ◽  
Initial Contact ◽  
Kinematic Data ◽  
Healthy Elderly ◽  
Spatio Temporal ◽  
Clinical Measures ◽  
Healthy Elderly Subjects

There is a lack of studies comparing the kinematics data of idiopathic Parkinson's disease (IPD) patients with healthy elder (HE) subjects, and when there is such research, it is not correlated to clinical measures. OBJECTIVE: To compare the spatio-temporal and kinematic parameters of Parkinsonian gait with the HE subjects group and measure the relation between these parameters and clinical instruments. METHOD: Twelve patients with IPD and fifteen HE subjects were recruited and evaluated for clinical instruments and gait analysis. RESULTS: There were statistically significant differences between HE group and the IPD group, in stride velocity, in stride length (SL), and in the hip joint kinematic data: on initial contact, on maximum extension during terminal contact and on maximum flexion during mid-swing. Regarding the clinical instruments there were significant correlated with in stride velocity and SL. CONCLUSION: Clinical instruments used did not present proper psychometric parameters to measure the IPD patient's gait, while the 3D system characterized it better.

scholarly journals Visual Attention and Aging: an Age-Related Cognitive Model of Positive Adaptation

2014 ◽  
Vol 4 (3) ◽  
pp. 181-191
Author(s):  
José Manuel Rodríguez-Ferrer
Keyword(s):  
Young People ◽  
Visual Attention ◽  
Response Times ◽  
Age Groups ◽  
Cognitive Model ◽  
Covert Attention ◽  
Positive Adaptation ◽  
Healthy Elderly ◽  
Age Related ◽  
Healthy Young People

We have studied the effects of normal aging on visual attention. Have participated a group of 38 healthy elderly people with an average age of 67.8 years and a group of 39 healthy young people with average age of 19.2 years. In a first experiment of visual detection, response times were recorded, with and without covert attention, to the presentation of stimuli (0.5º in diameter grey circles) appearing in three eccentricities (2.15, 3.83 and 5.53° of visual field) and with three levels of contrast (6, 16 and 78%). In a second experiment of visual form discrimination circles and squares with the same features as in the previous experiment were presented, but in this case subjects only should respond to the emergence of the circles. In both age groups, the covert attention reduced response times. Compared to young people, the older group achieved better results in some aspects of attention tests and response times were reduced more in the stimuli of greater eccentricity. The data suggest that there is a mechanism of adaptation in aging, in which visual attention especially favors the perception of those stimuli more difficult to detec

Touch Noise Increases Vibrotactile Sensitivity in Old and Young

2005 ◽  
Vol 16 (4) ◽  
pp. 313-320 ◽  
Author(s):  
Cari Wells ◽  
Lawrence M. Ward ◽  
R. Chua ◽  
J. Timothy Inglis
Keyword(s):  
Young People ◽  
Elderly People ◽  
Stochastic Resonance ◽  
A Priori ◽  
Sensory Thresholds ◽  
Random Energy ◽  
Healthy Elderly ◽  
Vibrotactile Thresholds ◽  
Healthy Young People ◽  
Healthy Elderly People

Stochastic resonance (SR) occurs when the detection of a subthreshold signal is aided by the presence of random energy fluctuations in the signal modality, commonly called noise. SR is counterintuitive because such noise usually worsens performance. Nonetheless, SR has been demonstrated both theoretically and experimentally in human sensory systems. Using a psychophysically sophisticated paradigm, we show that SR aids the detection of vibrating touch stimuli presented to the foot soles of both healthy elderly people with elevated vibrotactile thresholds and healthy young people with normal vibrotactile thresholds. The results also suggest that it is possible to know a priori the amount of noise needed for optimal SR effects given the degree to which the signal is subthreshold. Thus, SR may be practical as a rehabilitative aid for individuals with elevated sensory thresholds.

Sign in / Sign up

Export Citation Format

Share Document