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Approximately 48 documents matched your search.
  1. Making Your Fluids Work Harder When You Work Hard

     Water is an unassuming nutrient in the scheme of diet and fitness.  Most of us focus on nutrients that give energy, build stronger bones and muscle, or have key metabolic action in our bodies.  Water is the one that, among other roles, provides the foundation upon which all other...

  2. Drinks with alkaline negative oxidative reduction potential improve exercise performance in physically active men and women: double-blind, randomized, placebo-controlled, cross-over trial of efficacy and safety

    The results of this study suggest that NORP alkaline water provides buffering abilities in athletes. Exercise performance could be increased, especially during maximal exercise. Lower heart rate indicates less cardiovascular stress and could be a source for enhanced performance. However, blood...

  3. Fluid replacement requirements for child athletes (A review)

    Dehydration occurs when one sweats to dissipate heat and then doesn’t drink enough water to compensate. Children were once believed to not be able to regulate their body temperature as well as adults while exercising, and especially while exercising in high heat. However, more recent data...

  4. Exercise-Associated Hyponatremia: Heat-Related Illness of Sodium and Water Imbalance During Exercise

    Physical exertion and athletic competition performed in environmental extremes are challenged by the risk of premature fatigue and heat illnesses. Heat cramps, heat exhaustion, and heat stroke are recognized by the medical professions as the traditional infirmities associated with exercise in hot...

  5. Exercise-induced dehydration with and without environmental heat stress results in increased oxidative stress

    Dehydration can cause stress on the body leading to sub-optimal performance. Oxidative stress is a result of production of reactive oxygen species (ROS). Although some ROS are naturally formed during the act of exercising itself, excessive ROS production can lead to unhealthy amounts of...

  6. Effects of combined creatine and sodium bicarbonate supplementation on repeated sprint performance in trained men

    This study showed that only 2 days of supplementation with both creatine and sodium bicarbonate increased the speed at which athletes completed cycling sprints. Both of these supplements are widely used and widely available (another name for sodium bicarbonate is baking soda) and may be an easy...

  7. Effects of heat exposure and 3% dehydration achieved via hot water immersion on repeated cycle sprint performance

    It is well established that hydration status is critical to work performance. Hypohydration of only 2% has been shown to impair endurance performance, and some studies indicate that hypohydration can likewise impair anaerobic work with dehydration ? 3%. However, data are lacking on the effects of...

  8. 3/4/2011 /Effect of milk protein addition to a carbohydrate-electrolyte rehydration solution ingested after exercise in the heat

     During exercise, sweat losses exceeding fluid intake result in a hypohydrated state. Restoration of fluid balance after exercise requires ingestion of fluid volumes greater than the volume of sweat lost. However, to maintain fluid balance the composition of the ingested solution must allow...

  9. 3/4/2011 / Increased blood pH but not performance with sodium bicarbonate supplementation in elite rugby union players

    High intensity, short duration activity relies on the anaerobic, glycolytic pathway which produces lactate and hydrogen ions (H+) as by products. Bicarbonate (HCO3-) is the most abundant acid buffer in blood. The bicarbonate pool is small and, when the...

  10. 3/4/2011 /Reproducibility and validity of bioimpedance spectroscopy for tracking changes in total body water: implications for repeated measurements

    Background: Total body water measurements are necessary to assess body composition changes from diet and exercise. Dilution techniques such as 2H analysis produce the most accurate results, but are expensive, time consuming, and require fixed equipment. Bioimpedance spectroscopy (BIS) is a...

  11. Initial hydration status, fluid balance, and psychological affect during recreational exercise in adults

    The authors did not state a specific hypothesis, but stated that the two main purposes of the study were to: 1) characterize the initial hydration status of subjects prior to exercise and to describe the subjects’ subsequent exercise session and fluid balance data; 2) examine psychological...

  12. 3/4/2011 /Serum sodium concentration changes are related to fluid balance and sweat sodium loss

     Large reductions in serum sodium concentration have been observed during prolonged exercise in military personnel and athletes. Serum sodium concentration reflects the sodium concentration in extracellular fluid spaces. Therefore, reduction in sodium concentration can be attributed to either...

  13. Impact of fluid restriction and ad libitum water intake or an 8% carbohydrate-electrolyte beverage on skill performance of elite adolescent basketball players

    • The Spearman correlation coefficients were 0.56 for knowledge score vs. behavior score, 0.75 for behavior score vs. fluid intake, and 0.76 for knowledge score. However, for some behaviors, there was a large gap between knowledge and practice. For example, 75% of the athletes knew that...

  14. Estimated fluid and sodium balance and drink preferences in elite male junior players during an ice hockey game

    Athletes undergo significant losses of water during intense training and competitions. When water loss reaches 2.0%, performance often suffers. However, compared to football, soccer, and basketball, ice hockey is played in a cold environment and players experience many opportunities to rehydrate...

  15. 3/4/2010 / Effects of various sodium bicarbonate loading protocols on the time-dependent extracellular buffering profile

    Although much research has investigated the types of exercise that are enhanced with sodium bicarbonate (NaHCO3) ingestion, to date there has been limited research on the dosage and timing of ingestion that optimizes the associated ergogenic effects.

  16. 3/4/2011 / Effects of a mineral antioxidant complex on clinical safety, body water, lactate response, and aerobic performance in response to exhaustive exercise

    Silica forms unique bonds with water molecules and is thought to enhance water retention during intense exercise. Its unique chemical structure might also help buffer lactate.

  17. 3/4/2011 / The effect of L-ornithine hydrochloride ingestion on performance during incremental exhaustive ergometer bicycle exercise and ammonia metabolism during and after exercise

    During exercise, ammonia (NH4+) resulting from protein oxidation can accumulate in the muscle and, among other factors, is a potential cause muscle fatigue. Ammonia and lactic acid disrupt pH homeostasis in the muscle and ammonia can consume inosinic acid that is used to make...

  18. 3/4/2011 / Relationship between changes in upon-waking urinary indices of hydration status and body mass in adolescent Singaporean athletes

    Staying well hydrated is imperative for optimum sports performance. Is the color (Ucol) and specific gravity (Usg) of urine able to be determined by athletes in order to personally assess hydration status? Is a change in body weight reflective of hydration status?

  19. 3/4/2011 / Reproducibility and validity of bioimpedance spectroscopy for tracking changes in total body water: implications for repeated measurements

    Total body water measurements are necessary to assess body composition changes from diet and exercise. Dilution techniques such as 2H analysis produce the most accurate results, but are expensive, time consuming, and require fixed equipment. Bioimpedance spectroscopy (BIS) is a portable...

  20. 3/4/2011 / Carbohydrate oxidation from a carbohydrate gel compared to a drink during exercise

    Ingestion of solutions with glucose (GLU) and fructose (FRC) leads to 20%-50% higher carbohydrate (CHO) oxidation rates compared with GLU alone. It is hypothesized that a high GLU oxidation rate may be beneficial to delay fatigue, increase endurance, and enhance performance, especially late in...

  21. 3/4/2011 Hydration status of rugby league players during home match play throughout the 2008 Super League season

     Rugby is a physically demanding sport, with an estimate that players can expend 24 kcal/min. Sweating is a mechanism of heat dissipation during high intensity exercise and, if sweat loss is not balanced with fluid intake, performance can suffer.

  22. 3/4/2011 / Voluntary fluid intake, hydration status, and aerobic performance of adolescent athletes in the heat

     Exercising in higher temperatures can lead to dehydration if voluntary fluid intake does not adequately compensate for fluid loss. The composition, flavor, and temperature of a drink influences fluid consumption. In several studies, dehydration was prevented in highly trained and...

  23. 3/4/2011 /No exercise-associated hyponatremia found in an observational field study of male ultra marathoners participating in a 24-hour ultra-run

     Exercise-associated hyponatremia (EAH) occurs when there is excessive water intake during exercise and is defined by a serum or plasma sodium concentration below the normal range of the testing laboratory, typically < 135 mmol/L. Among marathon runners, the overall prevalence of EAH is...

  24. 3/4/2011 /Effect of hypohydration and altitude exposure on aerobic exercise performance and acute mountain sickness

     High altitude exposure greatly reduces aerobic ability, increases fluid loss, and can lead to acute mountain sickness (AMS). Increased fluid loss can result in hypohydration (greater than 4% body mass loss) and is a concern for athletes, military personnel, and even civilians participating...

  25. 3/4/2011 /Sodium bicarbonate supplementation prevents skilled tennis performance decline after a simulated match

    Tennis is a repetitive short-term high-intensity sport. As such, it could result in significant neuromuscular fatigue and decreased skill performance. Sodium bicarbonate (NaHCO3) and other alkalinizing agents have been proposed as potential performance aids for their effects on providing increased...

  26. 3/4/2011 /Water and solute absorption from carbohydrate-electrolyte solutions in the human proximal small intestine: a review and statistical analysis

    Intestinal fluid and nutrient absorption has been investigated in humans at rest and during exercise using a triple-lumen tube intubation perfusion technique beginning in the early 1960s. The triple-lumen tube intubation-perfusion technique provides a precise measurement of transport rate of water...

  27. 3/4/2011 /Three percent hypohydration does not affect the threshold frequency of electrically-induced cramps

     Dehydration during exercise may be associated with muscle cramps. Research into the mechanism of exercise-associated muscle cramping (EAMC) is often observational, and factors such as fatigue or electrolyte loss are rarely controlled. Inducing cramps with electrical stimulation, rather than...

  28. 3/4/2011 /To drink or not to drink? Explaining "contradictory findings" in fluid replacement and exercise performance evidence from a more valid model for real-life competition

    This brief editorial (1 page) discusses the current evidence for recommendations on fluid replacement during exercise. Several current and 1 older study casting doubt on the benefit of aggressive fluid replacement on competitive sports performance are presented, specifically the report by Marino...

  29. To drink or not to drink? Explaining “contradictory findings” in fluid replacement and exercise performance: evidence from a more valid model for real-life competition

    To drink or not to drink? Explaining “contradictory findings” in fluid replacement and exercise performance: evidence from a more valid model for real-life competition

  30. Effect of milk protein addition to a carbohydrate-electrolyte rehydration solution ingested after exercise in the heat

    Insulin is a hormone that stimulates body cells, including muscle, to take up glucose from the blood stream. Patients with type 1 diabetes do not produce insulin and therefore must administer it themselves in conjunction with a meal. During exercise, muscle takes up glucose at a faster rate than...

  31. Effects of hypohydration on thermoregulation during exercise before and after 5-day aerobic training in a warm environment in young men

    Training in high heat environments helps the body to adapt to temperature regulation under those conditions. The authors wished to examine how dehydration, as opposed to euhydration, affects the thermoregulatory adaptations to exercise.

  32. First reported cases of exercise-associated hyponatremia in Asia

    Exercising for long periods of time (hrs), especially in hot, humid environments, puts athletes at risk for low sodium concentrations in the blood (hyponatremia). Symptoms of hyponatremia include confusion, agitation, and other neural problems and can be life-threatening. Not intuitively,...

  33. Fluid balance of elite Brazilian youth soccer players during consecutive days of training

    Dehydration is possible during exercise when the athlete does not consume enough fluid to compensate for fluid losses, mostly due to increased sweating. Dehydration can cause a decrease in performance. Despite access to beverages, adult athletes often do not consume adequate fluid to replenish...

  34. Changes in body mass alone explain almost all of the variance in the serum sodium concentrations during prolonged exercise. Has commercial influence impeded scientific endeavour?

    Overconsumption of water or electrolyte-rich sports beverages can increase the risk for EAH and EAHE. The author claims that, although these findings have been shown in the scientific literature, companies and associations can distort or overshadow the findings in order to sell sports products...

  35. Exercise-induced trace mineral element concentration in regional vs. whole-body wash-down sweat

    The authors concluded that the patch method was not a validated surrogate for whole-body wash-down technique for the measurement of sweat calcium, magnesium, or copper. The concentrations of these electrolytes in sweat are very small and do not usually represent much of a concern relative to...

  36. Beliefs about hydration and physiology drive drinking behaviours in runners

    Exercise-induced hyponatremia (EAH) is a condition caused by overconsumption of water or other dilute beverages, especially while exercising. While the risks of dehydration are emphasized in our society, many athletes are unaware of the risk and consequences of over-hydration and EAH.

  37. Effect of a carbohydrate-electrolyte beverage, lemon tea, or water on rehydration during short-term recovery from exercise

    Consumption of CE during recovery from a 60-minute exercise produced the greatest rehydration and least diuretic effect compared with lemon tea and water. However, the differences in CHO concentration between the lemon tea and CE drinks may have affected fluid retention. In addition, the higher...

  38. Black tea is not significantly different from water in the maintenance of normal hydration in human subjects: results from a randomized controlled trial

    Normal tea consumption probably does not cause dehydration. British nutritional advisory committees recommend consuming extra water when consuming caffeinated beverages, but this practice may not be warranted.

  39. Endocrine responses during overnight recovery from exercise: Impact of nutrition and relationships with muscle protein synthesis.

    Muscle repair and hypertrophy (growth) after exercise are affected by hormone responses to exercise and are measured by rate of muscle synthesis. A large amount of recovery-based physiology occurs during sleep.

  40. Effects of acute alkalosis and acidosis on performance: A meta-analysis

    The acidity/alkalinity of the blood and intracellular muscle compartments may affect performance and can be regulated through supplementation. Bicarbonate is the natural buffer in the blood and, due to acid production during exercise, athletes attempt to increase the buffering capacity of the...

  41. Exercise–associated hyponatremia in the tropics

    The authors have written a response to comments made by Dr. Shepard (Shepard RJ. Int J Sports Med. 2011;32[10]:814) regarding their study. An objection to using incidence rate (per 10,000 participants) with such a small number of participants was acknowledged. However, the authors provided these...

  42. Trained humans can exercise safely in extreme dry heat when drinking water ad libitum

    Although evidence supports the concept that human thermoregulatory capacity is limited and may reduce exercise performance in extreme environmental conditions, there is some evidence that athletic performance can be maintained in extreme heat. Biologic control of thermoregulatory response may be...

  43. Exercise-associated hyponatremia in the tropics

    Comments were made by Dr. Shepard regarding a recent study suggesting that exercise-associated hyponatremia could be a problem, even in warm climates (Lee JKW, et al. Int J Sports Med. 2011;32:297-302). He raised an objection to using incidence rate (per 10,000 participants) with such a small...

  44. The effects of Energised Greens™ upon blood acid-base balance during resting conditions

    High intensity exercise is associated with decreased pH (increased acidity) in muscle and may affect blood pH as well. In order to attenuate the increase in acidity in the blood,ingestion of alkaline compounds and/or agents that help buffer the blood (ex. sodium bicarbonate) have been recommended....

  45. 5/3/2012 / Water temperature, voluntary drinking and fluid balance in dehydrated Taekwondo athletes

    Cold water tastes better (Boulze et al., 1983) but the volume consumed tends to be less than cool water. The temperature likely reduces hyperthermia caused by exercise (i.e. overheating). In order to balance fluid replacement and establishment of temperature regulation, "cool"...

  46. Effects of dehydration during cycling on skeletal muscle metabolism in females

    While cycling, the athletes that did not drink water (DEH) lost 2% of their body weight in 2 hrs.  Also, many physiological stressors associated with exercise were exacerbated, including increased heart rate, core body temperature, ratings of perceived exertion, and lactate concentrations in...

  47. Sex differences in fluid balance responses during prolonged exercise

    There were clearly more incidences of dehydration in men in this study than in women. This result is likely caused by differences in men and women in regard to sweat threshold and sweat rate; men tend to sweat at a lower core body temperature, tend to have a different morphology (more muscle,...

  48. Contemporary Sports Nutrition Abstracts and Articles

    On this page, you will find helpful sports nutrition articles and abstracts culled from 47 nutrition and exercise journals from July 2015.
    The articles below were selected only if they included research in humans, although exceptions were made for particularly interesting and...

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