This paper describes the design, technical characteristics and first results of an adjustable instrumented chair with a sitting surface that records the forces under each thigh. The seat includes a force platform assembly suitable for measuring the magnitude, position and direction of the force applied to each thigh while sitting or rising from the chair. The natural frequency of the chair fixed to the floor was found to be 14.0 +/- 2 Hz with an estimated damping of xi = 0.20. Static tests showed that the maximal errors were 2% of the full-scale output (726 N vertically, 164 N horizontally) for both vertical and horizontal forces. The root mean square error of the center of pressure location was estimated as 5 mm. Preliminary data on the net joint moment at the hips of one healthy subject computed with and without consideration for the forces under the thighs revealed significant amplitude differences. In conclusion, the results indicate that the characteristics of the instrumented chair are acceptable and the chair can be used to assess the biomechanics of sitting and sit-to-stand and stand-to-sit tasks in various subject populations.
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http://dx.doi.org/10.1007/s11517-007-0301-z | DOI Listing |
Oxf Med Case Reports
January 2025
Anesthesiology, Intensive Care and Emergency Department, University Hospital Mohammed VI of Marrakesh, Marrakesh, Morocco.
Crush trauma of extremities, resulting from a crushing force, can be life-threatening even without involving vital organs. Crush syndrome, or traumatic rhabdomyolysis, occurs when muscle cell breakdown releases contents into the bloodstream, leading to systemic complications like acute renal failure. A 35-year-old woman trapped under rubble during11 hours during a seismic event, presenting with compartment syndrome in her left arm and thigh and crush syndrome.
View Article and Find Full Text PDFPoult Sci
January 2025
State Key Laboratory of Livestock and Poultry Breeding, Guangdong Provincial Key Laboratory of Animal Nutrition and Regulation, College of Animal Science, South China Agricultural University, Guangzhou 510000, PR China. Electronic address:
Good skin quality not only improved carcass quality but also increased consumer demand for fresh poultry meat. This study aimed to investigate the developmental changes in skin growth and quality of Pekin ducks during 1-6 weeks of age. The skin samples were collected from the breast, back, and thigh tissues of six male ducks at the end of each week.
View Article and Find Full Text PDFMed Sci Sports Exerc
November 2024
Mary MacKillop Institute for Health Research, Australian Catholic University, Melbourne, VIC, AUSTRALIA.
Purpose: To examine sex-based differences in substrate oxidation, postprandial metabolism, and performance in response to 24-hour manipulations in energy availability (EA), induced by manipulations to energy intake (EI) or exercise energy expenditure (EEE).
Methods: In a Latin Square design, 20 endurance athletes (10 females using monophasic oral contraceptives and 10 males) undertook five trials, each comprising three consecutive days. Day one was a standardized period of high EA; EA was then manipulated on day two; post-intervention testing occurred on day three.
PLoS One
January 2025
School of Kinesiology, University of British Columbia, Vancouver, British Columbia, Canada.
Our ability to balance upright provides a stable platform to perform daily activities. Balance deficits associated with various clinical conditions may affect activities of daily living, highlighting the importance of quantifying standing balance in ecological environments. Although typically performed in laboratory settings, the growing availability of low-cost inertial measurement units (IMUs) allows the assessment of balance in the real world.
View Article and Find Full Text PDFJ Exp Biol
January 2025
Department of Ecology, Evolution, and Organismal Biology, Brown University, Providence, RI, USA.
Theoretically, animals with longer hindlimbs are better jumpers, while those with shorter hindlimbs are better maneuverers. Yet experimental evidence of this relationship in mammals is lacking. We compared jump force and maneuverability in a lab population of Mongolian gerbils (Meriones unguiculatus).
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