Results 241 to 250 of about 7,284,729 (277)

Intra-Individual Variation and Estimates of Usual Physical Activity

Annals of Epidemiology, 1999
The magnitude of intra-individual variation, as determined by three methods of physical activity (PA) assessment, was estimated to determine the optimal number of repeated measures needed to reliably measure an individual's usual PA habits.Data were obtained from 77 healthy adults enrolled in the Survey of Activity, Fitness, and Exercise (SAFE). PA was
S, Levin, D R, Jacobs, B E, Ainsworth, M T, Richardson, A S, Leon   +4 more
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Intra‐individual variations of salivary microbial levels in young adults

European Journal of Oral Sciences, 1998
The variations of salivary levels of total viable flora, oral streptococci, Streptococcus mutans, Lactobacillus and Candida in twenty-three subjects, over a 6-month period, trying to control many potential sources of variability, were investigated. Most subjects showed log count variations of the microbial parameters larger than 1.
PETTI, Stefano, TARSITANI, Gianfranco
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Intra-individual variation and evolution of modular structure in Draba plants

Biosystems, 2014
We studied the evolution of quantitative traits related to shoot system architecture in a large genus Draba (Brassicaceae) making emphasis on the dynamics of relationship between individual and intra-individual variation. The results suggest that selection leading to origin of different life forms arises mainly from a necessity of moderation of the non-
Olga V. Grigorieva, Vladimir G. Cherdantsev   +1 more
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Intra- and Inter-Individual Variation of the Human Lipidome [PDF]

TrAC - Trends in Analytical Chemistry
Lipids play essential roles in cellular functions such as membrane structure, signaling, and energy storage. Lipidomics—global study of lipids in cells and tissues—seeks to identify biomarkers and uncover underlying metabolic pathways.
Matej Orešič, Yuqin Wang, William J Griffiths   +2 more
exaly   +4 more sources

Intra-individual variation of plasma lipids and lipoproteins in prepubescent children

European Journal of Applied Physiology, 1999
Estimates of the average intra-individual biological variability for plasma lipids and lipoproteins differs substantially among published studies. Moreover, this topic does not appear to have received consideration in exercise and health literature with normal, healthy children as subjects.
K, Tolfrey, I G, Campbell, A M, Jones
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Estimation of Subject-Specific Heritabilities From Intra-Individual Variation: iFACE

Twin Research and Human Genetics, 2012
A new genetic factor model for multivariate phenotypic time series, iFACE, is presented which allows for the estimation of subject-specific model parameters of genetic and environmental factors. The iFACE was applied to multivariate EEG registrations obtained with single dizygotic twin pairs.
Molenaar, Peter C.M., Smit, Dirk J.A., Boomsma, Dorret I., Nesselroade, John R.   +3 more
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Inter- and intra-individual sources of variation in levels of urinary styrene metabolites

International Archives of Occupational and Environmental Health, 2001
Given the paucity of studies that have examined variability in biological measures of exposure to workplace contaminants, we quantified the intra- and inter-individual sources of variation in urinary levels of mandelic acid (MA) and phenylglyoxylic acid (PGA) among workers exposed to styrene. A secondary objective was to examine effects of job task and
SYMANSKI E, BERGAMASCHI, Enrico, MUTTI, Antonio   +2 more
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Intra‐individual variations in acute and cumulative skin irritation responses

Contact Dermatitis, 2001
It is well‐known that humans show a wide range of variation in skin reactivity to irritant chemicals. This has been established through population studies, through the examination of inter‐subject variability, and (to a limited extent) through studies of skin site variation in response within subjects.
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Inter- and Intra-Individual Variations during the Progress of Motor Learning

Research Quarterly. American Association for Health, Physical Education and Recreation, 1968
Abstract The effects of practice and the passage of time on individual differences (true-score variance) and intra-individual variation were investigated. One hundred and twenty male university students were tested on a Koerth type pursuit rotor. One group was tested on six days spaced over a three-week period.
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Peroxidase activity in human granulocytes, inter- and intra-individual variations

Scandinavian Journal of Clinical and Laboratory Investigation, 1977
A kinetic method for quantitation of peroxidase activity ('myeloperoxidase', E.C. 1.11.1.7.) in human granulocytes has been evaluated. The enzymic activity was determined at 37 degrees C, PH = 7.0. Substrates: 2-methyxo-phenol (1.25 mmol/l) and H2O2 (0.1 mmol/l). When applied on granulocytes from solitary blood samples from healthy, normal subjects the
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