α-Tocopherol Supplementation in Racing Cyclists during Extreme Endurance Training

Rokitzki, L; Logemann, Enno; Huber, G. Carl; Keck, E.; Keul, J.

doi:10.1123/ijsn.4.3.253

Cited by 112 publications

(89 citation statements)

References 11 publications

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“…However, no study has demonstrated improvement in performance after supplementation in non-deficient individuals (34)(35) . Due to α-tocoferol efficiency in reacting with peroxyl radicals, many studies have been conducted with the purpose to evaluate the effect of α-tocoferol supplementation in the LP, caused by oxidative stress induced by physical exercise.…”

Section: Vitamin Ementioning

confidence: 99%

“…Rokitzki et al (34) have observed that the supplementation promoted lower plasma concentration of CK in response to endurance exhaustive exercise practiced by athletes. Sachek et al (37) verified this effect up to 24 hours after running exercise at 75% VO 2máx in young males, supplemented with 1000 UI/day of vitamin E during 12 weeks.…”

Section: Vitamin Ementioning

confidence: 99%

“…Metin et al (36) also verified reduction in the TBARS concentration in rats supplemented with α-tocoferol (30 mg/kg/day) and training in swimming. Rokitzki et al (34) have reported that cyclists taking 300 mg of α-tocoferol/day during 20 weeks presented lower concentration of malonaldehyde (MDA), a product from the LP, after exhausting exercise, when compared with the control group.…”

Section: Vitamin Ementioning

confidence: 99%

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Aspectos atuais sobre estresse oxidativo, exercícios físicos e suplementação

Cruzat

Rogero

Borges

et al. 2007

Rev Bras Med Esporte

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Oxygen reactive species (ORE) are usually produced by the body metabolism. However, ORE present the ability to remove electrons from other cellular composites, being able to cause oxidative injuries in several molecules. Such fact leads to a total loss of cellular function. Physical exercise practice increases ORE synthesis, besides promoting muscular injury and inflammation. After a physical exercise set, the recovery phase begins, where several effects positive to health are observed, including increase in resistance to new injuries induced or not by exercise, a fact which is considered an 'adaptation' process. Many studies though, have reported that this recovery is not reached by individuals who are submitted to intense and extended exercises, or even, who have high training frequency. Nutritional alternatives have been widely studied, in order to reduce the effects promoted by extenuating exercise, among which vitamin E, vitamin C, creatine and glutamine supplementation is included. This review has the aim to approach the current aspects concerning the ORE formation, the cellular injury and inflammation processes, the adaptation to the kinds of aerobic and anaerobic exercise, besides possible nutritional interventions.

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Section: Vitamin Ementioning

confidence: 99%

Section: Vitamin Ementioning

confidence: 99%

Section: Vitamin Ementioning

confidence: 99%

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Aspectos atuais sobre estresse oxidativo, exercícios físicos e suplementação

Cruzat

Rogero

Borges

et al. 2007

Rev Bras Med Esporte

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show abstract

“…There are, however, occasional reports of marginal vitamin B 6 and E intake in male athletes 54 . Vitamin intakes in female athletes are typically above the recommendations, but not very much higher than in untrained females 28,30,33,53,[57][58][59][60][61] . Several studies have found low iron 28,30,53,[57][58][59][60][61] , zinc 30,59,62 and copper 28 intakes in both female athletes and controls.…”

Section: Dietary Intake -A Balancing Factor?mentioning

confidence: 99%

Micronutrients: interaction between physical activity, intakes and requirements

Fogelholm

1999

Public Health Nutr.

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The present literature review examines the following questions: (a) What is the evidence that micronutrient requirements are increased in physically active people? (b) Is there an association between physical activity and micronutrient intake? (c) Are there any significant differences between indices of micronutrient status between physically active and inactive people? The available data suggest that micronutrient requirements are increased in physically active people because of increased losses through sweat, urine and faeces, and an increased need for defence against free radicals. However the evidence is controversial, and it is not possible to make any quantitative estimations. Micronutrient requirements in moderately active people are not likely to be very much above the levels recommended for the general population. The intake of micronutrients increases with increasing energy intake. Therefore, physically highly active people (athletes) have higher micronutrient intakes than untrained subjects. However, moderate physical activity does not necessarily affect daily micronutrient intake. The available indices of micronutrient status do not support the belief that micronutrient status is compromised in highly trained athletes, even without use of dietary supplements. Hence, there are no reasons to believe that the situation would be different in people who are only moderately active. The results suggest that micronutrient status is adequate for health and functional performance in physically active people who follow a normal, mixed Western diet.

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“…Plasma LOOHs levels were determined using the FOX 2 method [29] with minor modifications [34]. The FOX 2 test system is based on the oxidation of ferrous ion to ferric ion by various types of peroxides contained within the plasma samples, to produce a colored ferricxylenol orange complex whose absorbance can be measured.…”

Section: Measurement Of Plasma Loohs Levelsmentioning

confidence: 99%