- Thread:
- Coconut water and sports drinks on hydration and physical performance
- Post:
- Coconut water and sports drinks on hydration and physical performance
- Author:
Elizabeth Trevino
- Posted Date:
- October 27, 2013 11:10 PM
- Status:
- Published
Coconut water and sports drinks on hydration and physical performance
Kalman, D. S., Feldman, S., Krieger, D. R., & Bloomer, R. J. (2012). Comparison of coconut water and a carbohydrate-electrolyte sport drink on measures of hydration and physical performance in exercise-trained men. Journal of the International Society of Sports Nutrition, 9(1), 1-10.
In keeping with current trends, many athletes are continually looking for organic/natural alternatives to consuming mass produced sport drinks. One such alternative is coconut water. Coconut water has been reported to provide hydrating effects similar to those of carbohydrate-electrolyte sport drinks. The purpose of this study is to compare coconut water and a carbohydrate-electrolyte sport drink on measures of hydration and physical performance.
12 physically active men (age 26.6 ± 5.7 years) participated or this study. This study, a single blind, cross-over design, tested the same group of men on four occasions, separated by at least five days in between each study. Following a 60 minute bout of endurance exercise, the test participants were randomly assigned to a fluid type for consumption of a post-exercise fluid recovery beverage. The four beverages being researched were: bottled water (BW), pure coconut water (VitaCoco; CW), coconut water from concentrate (CWC), and a carbohydrate-electrolyte sport drink (SD).
The dehydrating exercise protocol (for each of the four trials) reportedly induced a 2-3% reduction in body weight, the threshold amount for performance reductions on endurance exercises. Immediately following conclusion of the dehydrating exercise, participants received their assigned condition (beverage). The amount of each beverage was determined based on the total amount of body mass lost during the dehydrating exercise protocol (1300 mL · kg-1 x kg loss = amount of beverage consumed (mL)). Participants were allowed 60 min to consume the entire volume of assigned condition (beverage). Finally, three hours after the completion of the dehydrating exercise test, and 2 hours after participants consumed their assigned condition, a test of physical performance was conducted, a treadmill test until volitional exhaustion.
In regard to performance data, no significant difference was noted in total exercise time between BW, CW, CWC, and SD. Both the CW and the CWC and BW provide similar rehydrating effects as compared to SD. Overall, the findings indicate that all tested beverages were capable of promoting rehydration after one hour of dehydrating exercise.
Maintaining hydration status is vital for athletes and can directly impact exercise performance. While water intake is an adequate rehydration approach, many athletes involved in vigorous training benefit from the intake of water-carbohydrate or carbohydrate-electrolyte mixtures. This practice is reported to be superior to consuming water alone and is recommended for individuals that engage in long duration, strenuous bouts of acute exercise.
https://manowar.tamucc.edu/login?url=http://search.ebscohost.com/login.aspx?direct=true&db=s3h AN=74136352&site=eds-live&scope=site
- Thread:
- Effects of Fed- Versus Fast-State Aerobic Training
- Post:
- Effects of Fed- Versus Fast-State Aerobic Training
- Author:
- Michael Terencio
- Posted Date:
- October 27, 2013 7:23 PM
- Status:
- Published
Michael Terencio
KINE 5306 – Advanced Nutrition
Dr. Kelly Brooks
Sunday October 27, 2013
Research Review #1:
Trabelsi, Khaled, Kais el Abed, Stannard, Stephen R., Jammoussi, Kamel, Zeghal, Khaled M., and Hakim, Ahmed. (2012). Effects of Fed- Versus Fasted-State Aerobic Training During Ramadan on Body Composition and Some Metabolic Parameters in Physically Active Men. International Journal of Sport Nutrition and Exercise Metabolism, 2012, 22, 11-18.
Purpose of Study
The purpose of this investigation was to evaluate the effects of aerobic training paired with Ramadan fasting and its effects on body composition and metabolic parameters of physically active men. Another aim was to ascertain whether there are differences between the effects of aerobic training during the day (in a fasted state) and aerobic training at night (in a fed state) regarding body composition and selected metabolic parameters.
Methods and Materials
Nineteen active men were chosen to participate and were randomly allocated into two groups (9 subjects in the FED state and 10 subjects in the FAST state). All individuals were similar in weekly activity. Each subject performed at least 3 training sessions per week. Each session lasted 40-60 minutes and consisted of either cycling, running, or rowing on a cycle ergometer equipped with a heart-rate monitor. All participants kept record of their workouts, and for lab sessions, the same time was taken for each lab day, respective to each group. Each group performed each lab test day with the same duration. Participant observations were used for this study. Several areas of interest (body weight and composition, urine specific gravity, serum biochemistry) were sought out and analyzed.
Quantitative data was strictly statistical. All statistics were performed via Statistica Software (a well-accepted program originating from France). A 4 (periods) x 2 (FED or FAST) repeated-measures analysis of variance (ANOVA) was applied. FAST and FED differences were analyzed via t test. Statistical significance was set at p < .05, and all data were expressed as M ± SD.
Summary of Results/Conclusion
For body weight and composition reasons, lean body mass between FED and FAST did not change for either group during this study’s duration and there were no significant differences in lean body mass between the groups at any time period. Body fat percentage (BF%) in the FAST group dropped from pre-Ramadan (4 days before the fast) to end-Ramadan (30 days after beginning the fast) by 6.2%, and BF% in the FED group remained unchanged. With this said, this investigation showed that the FAST group (the 10 subjects that trained during their 15-hour daily fasting period) lowered both body weight and body fat, whereas the FED group (the 9 subjects that trained in a fed state after their 15-hour daily fasting period) lowered only their body weight.
In conclusion, Ramadan fasting paired with aerobic exercise bouts of 40-60 continuous minutes performed three or more days a week can effectively reduce body weight and body fat, and also help improve lipid profiles. As a safety measure, (concluded from the increases in renal function markers) those combining Ramadan with aerobic exercise should drink plenty of fluids during the nighttime to compensate for dehydration during daylight hours.
Critique of the Study
All reported results were unbiased and strictly based on the outcome of the study. There is no evidence to show unsupported findings by this study. Performance and biochemistry samples were all analyzed and later used to provide useful and accurate statistics. Knowing that (for some areas of this study) similar studies such as this have had the same outcome as this study did, it seems this study’s results make clear sense. The authors’ interpretation of their provided data appeared to reflect the overall situation and results in a reasonable way. All mechanisms seemed to have an explanation and all the data fully supported the authors’ discussion. Overall, I like this investigation and look forward to learning from more studies like this.
Practical Applications of the Study
As a personal trainer, I can see myself trying the FAST methods used here combined with resistance training on myself to see how it would affect my body composition during a 4 week trial.
- T
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