Automatic and quantitative assessment of regional muscle volume by multi-atlas segmentation using whole-body water-fat MRI

2014 ◽  
Vol 41 (6) ◽  
pp. 1558-1569 ◽  
Author(s):  
Anette Karlsson ◽  
Johannes Rosander ◽  
Thobias Romu ◽  
Joakim Tallberg ◽  
Anders Grönqvist ◽  
...  
Keyword(s):  
Quantitative Assessment ◽  
Body Water ◽  
Muscle Volume ◽  
Whole Body ◽  
Atlas Segmentation ◽  
Regional Muscle

scholarly journals Computed tomography-derived assessments of regional muscle volume: Validating their use as predictors of whole body muscle volume in cancer patients

2018 ◽  
Vol 91 (1092) ◽  
pp. 20180451 ◽  
Author(s):  
Darragh F Halpenny ◽  
Marcus Goncalves ◽  
Emily Schwitzer ◽  
Jennifer Golia Pernicka ◽  
Jasmyne Jackson ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cancer Patients ◽  
Muscle Volume ◽  
Whole Body ◽  
Body Muscle ◽  
Regional Muscle

scholarly journals BIOLOGICAL AGE AS A METHOD FOR ESTIMATING HEALTH LEVEL UNDER ENVIRONMENTAL RISKS (LITERATURE REVIEW)

2019 ◽  
Vol 98 (7) ◽  
pp. 761-765 ◽  
Author(s):  
N. I. Prokhorov ◽  
V. I. Dontsov ◽  
Vyacheslav N. Krutko ◽  
T. M. Khodykina
Keyword(s):  
Human Body ◽  
Quantitative Assessment ◽  
Modern Human ◽  
The Body ◽  
Biological Age ◽  
Whole Body ◽  
New Methods ◽  
Biomarkers Of Aging ◽  
Age Related ◽  
Definition Of

The widespread formation of unfavorable environmental, the swiftness of modern life with large information and psycho-emotional loads and extremely natural and climatic cataclysms, as well as harmful addictions and wrong way of life of modern human, lead to the development of stress and disruption of the mechanisms of adaptation of the human body and its accelerated wear. This stimulates the development of research on the creation of new methods of integrated assessment of health and quantitative assessment of the aging processes of the body systems and the whole body, as well as the possibilities of new methods of risk assessment of climatic and environmentally related pathological and age-related diseases. The aim of the work was to consider the methodology of quantitative assessment of individual health and the rate of aging of the human body on the basis of the system index of Biological age (BA); description of its essence and structure, requirements for tests - biomarkers of aging used as the index of BA, definition of possibilities and scope of application of the BA method in modern practice of Biomedicine. The use of modern methods of scientific analysis - a systematic approach to the analysis of the processes of human aging and determine its quantitative side - the value of BA, allows a reasonable approach to the choice of the number of BM, to take into account their information content and precision, and the cost of diagnostics and availability for different users, to take into account the specific objectives of the researcher. The use of the index-partial BA allows individual approaching the choice of biomarkers and create personalized panels for the definition of BA programs for the prevention of aging in personalized preventive medicine. The complexity of the content and calculation of indices of BA requires automation and the use of methods of modern computer science and computer calculations and programs. For this purpose, we have created special computer software for diagnosing aging by calculating the BA indices with the possibility of choosing BM and automatic calculation of indicators and conclusions.

scholarly journals Video-based quantification of human movement frequency using pose estimation

2021 ◽  
Author(s):  
Hannah L. Cornman ◽  
Jan Stenum ◽  
Ryan T. Roemmich
Keyword(s):  
Pose Estimation ◽  
Repeated Measures ◽  
Quantitative Assessment ◽  
Human Movement ◽  
Whole Body ◽  
Finger Tapping ◽  
Manual Measurement ◽  
Significant Difference ◽  
Repetitive Movements ◽  
Movement Frequency

ABSTRACTAssessment of repetitive movements (e.g., finger tapping) is a hallmark of motor examinations in several neurologic populations. These assessments are traditionally performed by a human rater via visual inspection; however, advances in computer vision offer potential for remote, quantitative assessment using simple video recordings. Here, we evaluated a pose estimation approach for measurement of human movement frequency from smartphone videos. Ten healthy young participants provided videos of themselves performing five repetitive movement tasks (finger tapping, hand open/close, hand pronation/supination, toe tapping, leg agility) at four target frequencies (1-4 Hz). We assessed the ability of a workflow that incorporated OpenPose (a freely available whole-body pose estimation algorithm) to estimate movement frequencies by comparing against manual frame-by-frame (i.e., ground-truth) measurements for all tasks and target frequencies using repeated measures ANOVA, Pearson’s correlations, and intraclass correlations. Our workflow produced largely accurate estimates of movement frequencies; only the hand open/close task showed a significant difference in the frequencies estimated by pose estimation and manual measurement (while statistically significant, these differences were small in magnitude). All other tasks and frequencies showed no significant differences between pose estimation and manual measurement. Pose estimation-based detections of individual events (e.g., finger taps, hand closures) showed strong correlations with manual detections for all tasks and frequencies. In summary, our pose estimation-based workflow accurately tracked repetitive movements in healthy adults across a range of tasks and movement frequencies. Future work will test this approach as a fast, low-cost, accessible approach to quantitative assessment of repetitive movements in clinical populations.

scholarly journals Quantitative Assessment of Whole-Body Tumor Burden in Adult Patients with Neurofibromatosis

PLoS ONE ◽  
2012 ◽  
Vol 7 (4) ◽  
pp. e35711 ◽  
Author(s):  
Scott R. Plotkin ◽  
Miriam A. Bredella ◽  
Wenli Cai ◽  
Ara Kassarjian ◽  
Gordon J. Harris ◽  
...  
Keyword(s):  
Quantitative Assessment ◽  
Tumor Burden ◽  
Adult Patients ◽  
Whole Body

Hyperhydration and Glycerol: Thermoregulatory Effects During Exercise in Hot Climates

2000 ◽  
Vol 25 (6) ◽  
pp. 536-545 ◽  
Author(s):  
William A. Latzka ◽  
Michael N. Sawka
Keyword(s):  
Heat Stress ◽  
Core Temperature ◽  
Body Water ◽  
Fluid Replacement ◽  
Whole Body ◽  
Threshold Temperature ◽  
Sweating Rate ◽  
Design Problems ◽  
Fluid Ingestion ◽  
Water Exercise

Hyperhydration or increasing body water content above normal (euhydration) level was thought to have some benefit during exercise heat-stress; however, attempts to overdrink have been minimized by a rapid diuretic response. The perception that hyperhydration might be beneficial for exercise performance and for thermoregulation arose from the adverse consequences of hypohydration. Many studies had examined the effects of hyperhydration on thermoregulation in the heat; however, most of them suffer from design problems that confound their results. The design problems included control conditions not representing euhydration but hypohydration, control conditions not adequately described, cold fluid ingestion that reduced core temperature, and/or changing heat acclimation status. Several investigators reported lower core temperatures during exercise after hyperhydration, while other studies do not. Some investigators reported higher sweating rates with hyperhydration, while other studies do not. Recent research that controlled for these confounding variables reported that hyperhydration (water or glycerol) did not alter core temperature, skin temperature, whole body sweating rate, local sweating rate, sweating threshold temperature, sweating sensitivity, or heart rate responces compared to euhydration trail. If euhydration is maintained during exercise-heat stress then hyperhydration appears to have no meaningful advantage. Key words: Hydration, fluid replacement, exercise heat-stress, total body water exercise

scholarly journals Automated assessment of regional muscle volume and hypertrophy using MRI

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mirko Mandić ◽  
Eric Rullman ◽  
Per Widholm ◽  
Mats Lilja ◽  
Olof Dahlqvist Leinhard ◽  
...  
Keyword(s):  
Knee Extensor ◽  
Quadriceps Muscle ◽  
Muscle Volume ◽  
Manual Segmentation ◽  
Automated Method ◽  
Fully Automatic ◽  
Automated Technique ◽  
Exercise Induced ◽  
Clinical Conditions ◽  
Regional Muscle

AbstractThis study aimed to validate a fully automatic method to quantify knee-extensor muscle volume and exercise-induced hypertrophy. By using a magnetic resonance imaging-based fat-water separated two-point Dixon sequence, the agreement between automated and manual segmentation of a specific ~15-cm region (partial volume) of the quadriceps muscle was assessed. We then explored the sensitivity of the automated technique to detect changes in both complete and partial quadriceps volume in response to 8 weeks of resistance training in 26 healthy men and women. There was a very strong correlation (r = 0.98, P < 0.0001) between the manual and automated method for assessing partial quadriceps volume, yet the volume was 9.6% greater with automated compared with manual analysis (P < 0.0001, 95% limits of agreement −93.3 ± 137.8 cm3). Partial muscle volume showed a 6.0 ± 5.0% (manual) and 4.8 ± 8.3% (automated) increase with training (P < 0.0001). Similarly, the complete quadriceps increased 5.1 ± 5.5% with training (P < 0.0001). The intramuscular fat proportion decreased (P < 0.001) from 4.1% to 3.9% after training. In conclusion, the automated method showed excellent correlation with manual segmentation and could detect clinically relevant magnitudes of exercise-induced muscle hypertrophy. This method could have broad application to accurately measure muscle mass in sports or to monitor clinical conditions associated with muscle wasting and fat infiltration.

scholarly journals Effect of exercise intervention on thigh muscle volume and anatomical cross-sectional areas-Quantitative assessment using MRI

2010 ◽  
Vol 64 (6) ◽  
pp. 1713-1720 ◽  
Author(s):  
Martin Hudelmaier ◽  
Wolfgang Wirth ◽  
Maria Himmer ◽  
Susanne Ring-Dimitriou ◽  
Alexandra Sänger ◽  
...  
Keyword(s):  
Quantitative Assessment ◽  
Exercise Intervention ◽  
Muscle Volume ◽  
Thigh Muscle ◽  
Cross Sectional

scholarly journals The method of calculating whole body water in hemodialysis patients

2007 ◽  
Vol 40 (5) ◽  
pp. 409-415
Author(s):  
Hideyo Ninomiya ◽  
Michihiro Takada ◽  
Nukio Toyoda ◽  
Yoshimasa Suetomo ◽  
Ryuichiro Mukai
Keyword(s):  
Hemodialysis Patients ◽  
Body Water ◽  
Whole Body

scholarly journals An improved method for estimating changes in whole-body fat and protein mass in man

1989 ◽  
Vol 62 (2) ◽  
pp. 311-314 ◽  
Author(s):  
P. R. Murgatroyd ◽  
W. A. Coward
Keyword(s):  
Total Body Water ◽  
Compartment Model ◽  
Body Water ◽  
Whole Body ◽  
Water Yield ◽  
Protein Mass ◽  
Body Composition Change ◽  
Three Compartment Model ◽  
Total Body ◽  
Mass Volume

Sequential measurements of body density or total body water yield inaccurate estimates of body composition change unless the proportions of protein, water and mineral in lean tissue remain constant. Since rates of change of bone mass in adults are likely to be small compared with those of fat or protein mass, volume and total body water measurements can be combined in a three-compartment model to estimate fat and protein changes assuming constant mineral mass. This new model minimizes the bias inherent in estimates of fat or protein changes made from separate density or total body water measurements.

Compensatory growth in immature sheep: I. The effects of weight loss and realimentation on the whole body composition

1975 ◽  
Vol 85 (2) ◽  
pp. 193-204 ◽  
Author(s):  
K. R. Drew ◽  
J. T. Reid
Keyword(s):  
Body Composition ◽  
Body Weight ◽  
Body Fat ◽  
Good Predictor ◽  
Dry Matter ◽  
Body Water ◽  
The Body ◽  
Whole Body ◽  
Body Protein ◽  
Ad Libitum

SUMMARYForty-eight cross-bred wether lambs were used to measure the effects of severe feed restriction and realimentation on the body and carcass composition of immature sheep. Ten of the total number of sheep were used as an initial slaughter group, 12 were continuously fed (six at the ad libitum level of intake and six at 70% ad libitum), 26 were progressively underfed and 18 of them were realimented after a mean loss of about 25% empty body weight (EBW).Shrunk body weight (SBW = weight after an 18-h fast with access to water) was a good predictor of empty body weight (EBW = SBW minus gastro-intestinal contents) and the EBW of continuously growing sheep was a good predictor of body water, protein, fat, energy and ash, but it was not precise after realimentation, particularly in the early stages of refeeding. Restricted continuous supermaintenance feeding did not alter the body composition of the sheep from that of the sheep on the ad libitum intake at any given EBW except slightly to increase the carcass protein content.Although underfeeding to produce an EBW loss of 25% generally produced changes in the chemical body components which were similar to a reversal of normal growth, body fat did not decrease during the first half of the submaintenance feeding and did not increase during the first 2 weeks of realimentation. Under all circumstances percentage body fat was very closely related to percentage body water.Sheep realimented at 26 kg (after losing 25% EBW) contained, at 45 kg EBW, more bodywater and protein and less fat and energy than continuously-fed animals of the same EBW. The treatment effects were greater in the carcass and had little effect on the non-carcass EBW, with th e result that the refed sheep had 1800 g more water × protein in a carcass that weighed 700 g more than one from a normally grown sheep of the same EBW. The regression of calorific value of th e ash-free dry matter on body fat as a percentage of ash-free dry matter gave calorific values of body protein and fat as 5·652 and 9·342 kcal/g of ash-free dry matter, respectively.

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