Search Results

You are looking at 1 - 10 of 553 items for :

  • "hydration" x
  • Refine by Access: All Content x
Clear All
Restricted access

The Analysis of Axisymmetric Viscoelasticity, Time-Dependent Recovery, and Hydration in Rat Tail Intervertebral Discs by Radial Compression Test

Leou-Chyr Lin, Thomas P. Hedman, Shyu-Jye Wang, Michael Huoh, and Shih-Youeng Chuang

The goal of this study was to develop a nondestructive radial compression technique and to investigate the viscoelastic behavior of the rat tail disc under repeated radial compression. Rat tail intervertebral disc underwent radial compression relaxation testing and creep testing using a custom-made gravitational creep machine. The axisymmetric viscoelasticity and time-dependent recovery were determined. Different levels of hydration (with or without normal saline spray) were supplied to evaluate the effect of changes in viscoelastic properties. Viscoelasticity was found to be axisymmetric in rat-tail intervertebral discs at four equidistant locations. Complete relaxation recovery was found to take 20 min, whereas creep recovery required 25 min. Hydration was required for obtaining viscoelastic axisymmetry and complete viscoelastic recovery.

Open access

Does Dehydration Affect the Adaptations of Plasma Volume, Heart Rate, Internal Body Temperature, and Sweat Rate During the Induction Phase of Heat Acclimation?

Yasuki Sekiguchi, Erica M. Filep, Courteney L. Benjamin, Douglas J. Casa, and Lindsay J. DiStefano

hydration status of the subjects exercising in the heat 4 – 8 and it is well known that hydration status impacts physiological and performance responses in the heat. 9 Some of the physiological responses that are desired to elicit heat acclimation (ie, higher heart rate and internal body temperature) are

Restricted access

Personalized Hydration Requirements of Runners

Samuel N. Cheuvront and Robert W. Kenefick

, the characterization of SL, SR, and required drinking among runners in this study indicate wide individual variability that warrants personalized hydration practices, particularly when running is prolonged and performance is important. This study may serve as a useful guidepost for sports dietitians

Restricted access

Urine Specific Gravity as a Practical Marker for Identifying Suboptimal Fluid Intake of Runners ∼12-hr Postexercise

Eric Kyle O’Neal, Samantha Louise Johnson, Brett Alan Davis, Veronika Pribyslavska, and Mary Caitlin Stevenson-Wilcoxson

There is no lack of information from the scientific community in regard to hydration advice for athletes ( Cheuvront et al., 2003 ; Cheuvront et al., 2007 ; Maughan & Shirreffs, 2008 ; Shirreffs et al., 2004 ), with significant evolutions in prominent position stands across time ( Casa et

Restricted access

Hydration Does Not Change Postexercise Hypotension and Its Mechanisms

Fernando S. Lobo, Andreia C.C. Queiroz, Natan D. Silva Junior, Fabio L. Medina, Luiz A.R. Costa, Tais Tinucci, and Claudia L.M. Forjaz

after exercise abolished PEH. Endo et al 10 showed that oral water intake during exercise also prevented PEH. Thus, these results suggest that intentional hydration may not be recommended when PEH is desirable. However, these studies have employed intravenous infusion 9 or have evaluated PEH in the

Restricted access

Calorie-Containing Recovery Drinks Increase Recreational Runners’ Voluntary Energy and Carbohydrate Intake, with Minimal Impact on Fluid Recovery

Ben Desbrow, Katelyn Barnes, Gregory R. Cox, Elizaveta Iudakhina, Danielle McCartney, Sierra Skepper, Caroline Young, and Chris Irwin

across the remainder of the day or next-morning hydration status (urine specific gravity [U SG ]). Hence, it was concluded that recovery stations served to promote positive lifestyle behaviors in recreational athletes. Food/fluid items within recovery stations are not standardized, and providing

Restricted access

Variability of Body Mass and Urine Specific Gravity in Elite Male Field Hockey Players During a Pre-Olympic Training Camp

Jason D. Vescovi and Greig Watson

hypohydration (2% body mass reduction) the previous day ( MacLeod & Sunderland, 2012 ). Thus, it is important to understand session-to-session hydration status so athletes can adequately replenish fluids and be fully rehydrated the next day ( Shirreffs, 2005 ). Field-based assessment techniques need to

Restricted access

Longitudinal Changes in Body Composition and Resting Metabolic Rate in Male Professional Flat Jockeys: Preliminary Outcomes and Implications for Future Research Directions

George Wilson, Carl Langan-Evans, Dan Martin, Andreas M. Kasper, James P. Morton, and Graeme L. Close

metabolic rate (RMR) and improved hydration status. The findings in this study are now the basis for “best” nutritional recommendations for jockeys by stakeholders within the racing industry ( Martin et al., 2017 ). While our previous findings suggest that short-term exercise and nutritional interventions

Restricted access

New Perspectives on Risk Factors for Exertional Heat Stroke

Margaret C. Morrissey, Michael R. Szymanski, Andrew J. Grundstein, and Douglas J. Casa

condition. Many EHS-prevention strategies have been adopted to enhance exercise heat tolerance, but not necessarily to decrease the incidence of EHS ( Alhadad, Tan, & Lee, 2019 ). Some examples of common strategies to enhance exercise heat tolerance include heat acclimatization (HA), hydration, work

Restricted access

Impairment of Thermoregulation and Performance via Mild Dehydration in Ice Hockey Goaltenders

Devin G. McCarthy, Kate A. Wickham, Tyler F. Vermeulen, Danielle L. Nyman, Shane Ferth, Jamie M. Pereira, Dennis J. Larson, Jamie F. Burr, and Lawrence L. Spriet

magnitude of DEH required to reduce performance was reduced when combined with heat stress. 12 In addition to maintaining hydration, consuming a carbohydrate–electrolyte solution (CES) improved performance, motor skills, and cognitive function in team sports. 13 Carbohydrate (CHO) may also improve