Investigación de una bebida para después de la práctica deportiva / Researching a post-exercise drink

Objetivos: Diseñar y probar una bebida para deportistas para tomar inmediatamente después del entrenamiento y competición. Para el diseño se ha recurrido a las últimas novedades de consenso en la elaboración de bebidas de reposición, especialmente la publicación del Comité Científico de Alimentación de la Unión Europea referente a los alimentos a tomar en función de la práctica deportiva", aunque con la importante novedad en comparación con otras fórmulas existentes en el mercado, de emplear zumos de frutas ricas en antioxidantes (flavonoles). Para experimentar la bebida se han realizado unas pruebas de esfuerzo en ciclistas mediante un sistema de doble ciego. Material y Métodos: Se escogió a 20 ciclistas de nivel nacional (VO2 max, de 68,6 milkg/min de media), a los cuales se sometió a un test específico para determinar el VO2 max. A continuación se diseñó un test rectangular de tina hora al 75 por ciento del VO2 max, tras el cual se le suministró al deportista un litro de bebida durante una hora, realizándose posteriormente un nuevo test rectangular también al 75 por ciento del VO2 max, hasta el agotamiento. En todos ellos se determinó la lactacidemia, glucemia e iones. A la semana siguiente, se les sometió a los deportistas a otra experiencia idéntica pero con otra bebida control. El sistema estadístico empleado fue de doble ciego aplicando un análisis de varianza correspondiente a un diseño factorial con intercambios (cross- over).Resultados: La bebida experimental produjo una hiperglucemia muy marcada (p<0.0003), aumentó la natremia (p<0.0475) y disminuyó la lactacidemia del test posterior a su ingesta (p<0.0003). Los test organolépticos demostraron una clara aceptación de la bebida. El índice de percepción del esfuerzo fue menor en los deportistas que tomaron la bebida diseñada. Conclusiones: Los resultados nos indican que la bebida diseñada restaura los electrolitos perdidos por la sudoración, aumenta la glucemia de forma muy significativa y mejora la percepción del esfuerzo en un segundo test permitiendo al deportista mantener la carga (75 por ciento del VO2 max) durante mas tiempo (AU)

A motivational interviewing intervention to increase fruit and vegetable intake through Black churches: results of the Eat for Life trial.

OBJECTIVES: This study reports on Eat for Life, a multicomponent intervention to increase fruit and vegetable consumption among African Americans that was delivered through Black churches. METHODS: Fourteen churches were randomly assigned to 3 treatment conditions: (1) comparison, (2) self-help intervention with 1 telephone cue call, and (3) self-help with 1 cue call and 3 counseling calls. The telephone counseling in group 3 was based on motivational interviewing. The primary outcome, assessed at baseline and 1-year follow-up, was fruit and vegetable intake as assessed by 3 food frequency questionnaires. RESULTS: Change in fruit and vegetable intake was significantly greater in the motivational interviewing group than in the comparison and self-help groups. The net difference between the motivational interviewing and comparison groups was 1.38, 1.03, and 1.21 servings of fruits and vegetables per day for the 2-item, 7-item, and 36-item food frequency questionnaires, respectively. The net difference between the motivational interviewing and self-help groups was 1.14, 1.10, and 0.97 servings for the 2-item, 7-item, and 36-item food frequency questionnaires, respectively. CONCLUSIONS: Motivational interviewing appears to be a promising strategy for modifying dietary behavior, and Black churches are an excellent setting to implement and evaluate health promotion programs.

Survey of UK dietetic departments: diet in secondary prevention of myocardial infarction.

AIM: To collate information on current British dietetic practice in the area of diet in secondary prevention of myocardial infarction, and to compare this with best evidence. METHODS: A questionnaire was sent to all Chief Dietitians, to be completed by the whole department, asking about current dietary advice and practice, referrals and written dietary information for people following myocardial infarction. RESULTS: Fifty-seven per cent of questionnaires were returned. Dietary fat advice was prioritized by 84% of departments, fruit and vegetables by 49%, oily fish by 45% and fibre by 28%. Most dietitians (81%) felt that this advice would protect from further cardiovascular disease. Percentages of post-myocardial infarction patients given advice by a dietitian varied (median 60%), reasons for non-referral included patients having normal lipids or weight. More were given dietary advice by another health professional (median 90%); however, most dietitians were unsure about the quality of this advice. Diet sheets were felt to reflect advice priorities, but where sheets were sent they were much less likely than departments to prioritize oily fish or fruit and vegetable advice. CONCLUSION: Dietetic practice for people following myocardial infarction is out of line with current best evidence. Almost half of departments correctly prioritize oily fish advice, but often only see patients with raised lipids or weight. This is not the most effective strategy for preventing deaths.

Comparison of antioxidant efficacy of vitamin E, vitamin C, vitamin A and fruits in coronary heart disease: a controlled trial.

OBJECTIVE: To determine the efficacy of various antioxidant vitamins and a major dietary source of antioxidants (fruits) we performed a randomized controlled trial. METHODS: 175 successive patients with coronary heart disease (CHD) presenting to our centre were recruited and using a Latin-square design divided into five groups of 35 each. The groups were matched for age, lifestyle and dietary variables, clinical diagnosis and drug treatment status. None of the patients was on lipid-lowering drugs. Supplemental vitamins were stopped for one month before study began and American Heart Association Step II dietary advice was given to all. At baseline, total cholesterol, triglycerides, HDL and LDL cholesterol and lipid peroxide measured as thiobarbaturic acid reactive substances (TBARS) were determined. Group I received placebo capsules; Group II vitamin E 400 units/day; Group III vitamin C 1,000 mg; Group IV vitamin A 25,000 IU; Group V received 400 gm of fruit daily. Lipids and lipid peroxide levels were determined at 30 days follow-up. RESULTS: Response rate in various groups varied form 86% to 91%. No significant changes in total, HDL, LDL cholesterol and triglyceride levels were seen in Groups I, II, III and IV (paired t-test p > 0.05). In Group V there was a significant decrease in total cholesterol (-7.8 +/- 11.1%), and LDL cholesterol (-11.2 +/- 25.4%) and increase in HDL cholesterol (+12.9 +/- 20.1%) (paired t-test p < 0.01). Lipid peroxide levels decreased significantly in all the treatment groups (p < 0.01). This decrease was the highest in Group II (vitamin E; -36.4 +/- 17.7%) as compared to Group III (vitamin C -19.8 -/+ 10.8%); Group IV (vitamin A -5.4 +/- 17%) and Group V (fruits -13.1 +/- 12.0%). CONCLUSIONS: All the antioxidant vitamins and fruits significantly decrease lipid peroxide levels and oxidant load in CHD patients. However, fruits are the best choice as they also favourably modify the lipid profile.

A possible emerging role of phytochemicals in improving age-related neurological dysfunctions: a multiplicity of effects.

It is rare to see a day pass in which we are not told through some popular medium that the population is becoming older. Along with this information comes the "new" revelation that as we enter the next millennium there will be increases in age-associated diseases (e.g., cancer, cardiovascular disease) including the most devastating of these, which involve the nervous system (e.g., Alzheimer's disease [AD] and Parkinson's disease [PD]). It is estimated that within the next 50 years approximately 30% of the population will be aged 65 years or older. Of those between 75 and 84 years of age, 6 million will exhibit some form of AD symptoms, and of those older than 85 years, over 12 million will have some form of dementia associated with AD. What appears more ominous is that many cognitive changes occur even in the absence of specific age-related neurodegenerative diseases. Common components thought to contribute to the manifestation of these disorders and normal age-related declines in brain performance are increased susceptibility to long-term effects of oxidative stress (OS) and inflammatory insults. Unless some means is found to reduce these age-related decrements in neuronal function, health care costs will continue to rise exponentially. Thus, it is extremely important to explore methods to retard or reverse age-related neuronal deficits as well as their subsequent, behavioral manifestations. Fortunately, the growth of knowledge in the biochemistry of cell viability has opened new avenues of research focused at identifying new therapeutic agents that could potentially disrupt the perpetual cycle of events involved in the decrements associated with these detrimental processes. In this regard, a new role in which certain dietary components may play important roles in alleviating certain disorders are beginning to receive increased attention, in particular those involving phytochemicals found in fruits and vegetables.

Role of bittergourd fruit juice in stz-induced diabetic state in vivo and in vitro.

The aqueous juice of bittergourd fruit (BF) (Momordica charantia L.) of the family Cucurbitaceae has been shown to possess hypoglycemic activity. However, the mechanism of its action is not known. Hence in vitro and in vivo experiments were carried out to study the role of BF juice on the diabetic status. The activity of BF juice was tested on STZ treated RIN cells and isolated islets in vitro. It was found that feeding with BF juice caused reduction in STZ-induced hyperglycemia in mice. It markedly reduced the STZ-induced lipid peroxidation in pancreas of mice, RIN cells and islets. Further it also reduced the STZ-induced apoptosis in RIN cells indicating the mode of protection of BF juice on RIN cells, islets and pancreatic beta-cells. Present study thus confirms hypoglycemic effect of BF juice and provides sufficient documentation to define its role and action for its potential and promising use in treating diabetes.

Vegetables, fruits, legumes and prostate cancer: a multiethnic case-control study.

The evidence for a protective effect of vegetables, fruits, and legumes against prostate cancer is weak and inconsistent. We examined the relationship of these food groups and their constituent foods to prostate cancer risk in a multicenter case-control study of African-American, white, Japanese, and Chinese men. Cases (n = 1619) with histologically confirmed prostate cancer were identified through the population-based tumor registries of Hawaii, San Francisco, and Los Angeles in the United States and British Columbia and Ontario in Canada. Controls (n = 1618) were frequency-matched to cases on ethnicity, age, and region of residence of the case, in a ratio of approximately 1:1. Dietary and other information was collected by in-person home interview; a blood sample was obtained from control subjects for prostate-specific antigen determination. Odds ratios (OR) were estimated using logistic regression, adjusting for age, geographic location, education, calories, and when indicated, ethnicity. Intake of legumes (whether total legumes, soyfoods specifically, or other legumes) was inversely related to prostate cancer (OR for highest relative to lowest quintile for total legumes = 0.62; P for trend = 0.0002); results were similar when restricted to prostate-specific antigen-normal controls or to advanced cases. Intakes of yellow-orange and cruciferous vegetables were also inversely related to prostate cancer, especially for advanced cases, among whom the highest quintile OR for yellow-orange vegetables = 0.67 (P for trend = 0.01) and the highest quintile OR for cruciferous vegetables = 0.61 (P for trend = 0.006). Intake of tomatoes and of fruits was not related to risk. Findings were generally consistent across ethnic groups. These results suggest that legumes (not limited to soy products) and certain categories of vegetables may protect against prostate cancer.

Botanical perspectives on health: of cystitis and cranberries.

With generalised increased use of antibiotics there has been the accompanying development of antibiotic resistance. It has been suggested that the therapy of uncomplicated cystitis is one area in which it is possible to reduce the usage of such compounds. Many women have long drunk cranberry juice--and it has become an 'old-wives' tale in the treatment of this infection. Perhaps it is now time for science to investigate further the benefits of the humble cranberry.

Cranberries for preventing urinary tract infections.

BACKGROUND: Cranberries (particularly in the form of cranberry juice) have been used widely for several decades for the prevention and treatment of urinary tract infections. The aim of this review is to assess the effectiveness of cranberries in preventing such infections. OBJECTIVES: To assess the effectiveness of cranberry juice and other cranberry products in preventing urinary tract infections in susceptible populations. SEARCH STRATEGY: Electronic databases and the Internet were searched using English and non English language terms; companies involved with the promotion and distribution of cranberry preparations were contacted; reference lists of review articles and relevant trials were searched. SELECTION CRITERIA: All randomised or quasi randomised controlled trials of cranberry juice/products for the prevention of urinary tract infections in susceptible populations. Trials of men, women or children were included. DATA COLLECTION AND ANALYSIS: Reviewers RJ and LM independently assessed and extracted information using specially designed data extraction forms. For each included trial, information was collected on methods of the trial, participants, interventions and outcomes. We were unable to perform statistical analysis due to the nature of the data available for review. MAIN RESULTS: Four trials met the inclusion criteria (three cross-over, one parallel group). Three compared the effectiveness of cranberry juice versus placebo juice or water and one compared the effectiveness of cranberry capsules versus placebo. Two further trials were excluded. The outcomes of interest were number of urinary tract infections in each group (symptomatic and asymptomatic), side effects and adherence to therapy. Data from three out of the four trials indicated that cranberries were effective for at least one of the outcomes of interest. The quality of the four included trials was poor, however, and thus the reliability of the results must be questionable. REVIEWER'S CONCLUSIONS: The small number of poor quality trials gives no reliable evidence of the effectiveness of cranberry juice and other cranberry products. The large number of dropouts/withdrawals from the trials indicates that cranberry juice may not be acceptable over long periods of time. Other cranberry products such as cranberry capsules may be more acceptable. On the basis of the available evidence, cranberry juice cannot be recommended for the prevention of urinary tract infections in susceptible populations. Further properly designed trials with relevant outcomes are needed.

Cranberries for treating urinary tract infections.

BACKGROUND: Cranberries (particularly in the form of cranberry juice) have been used widely for several decades for the prevention and treatment of urinary tract infections. The aim of this review is to assess the effectiveness of cranberries in treating such infections. OBJECTIVES: To assess the effectiveness of cranberries for the treatment of urinary tract infections. SEARCH STRATEGY: The search strategy developed by the Cochrane Renal Group was used. Also, companies involved with the promotion and distribution of cranberry preparations were contacted; electronic databases and the Internet were searched using English and non English language terms; reference lists of review articles and relevant trials were also searched. SELECTION CRITERIA: All randomised or quasi randomised controlled trials of cranberry juice or cranberry products for the treatment of urinary tract infections. Trials of men, women or children were included. DATA COLLECTION AND ANALYSIS: Titles and abstracts of studies that were potentially relevant to the review were screened by one reviewer, RJ, who discarded studies that were clearly ineligible but aimed to be overly inclusive rather than risk losing relevant studies. Reviewers RJ and LM independently assessed whether the studies met the inclusion criteria. Further information was sought from the authors where papers contained insufficient information to make a decision about eligibility. MAIN RESULTS: No trials were found which fulfilled all of the inclusion criteria. Two trials were excluded because they did not have any relevant outcomes. REVIEWER'S CONCLUSIONS: After a thorough search, no randomised trials which assessed the effectiveness of cranberry juice for the treatment of urinary tract infections were found. Therefore, at the present time, there is no good quality evidence to suggest that it is effective for the treatment of urinary tract infections. Well-designed parallel group, double blind trials comparing cranberry juice and other cranberry products versus placebo to assess the effectiveness of cranberry juice in treating urinary tract infections are needed. Outcomes should include reduction in symptoms, sterilisation of the urine, side effects and adherence to therapy. Dosage (amount and concentration) and duration of therapy should also be assessed. Consumers and clinicians will welcome the evidence from these trials.

The antihypertensive effects of the Jamaican Cho-Cho (Sechium edule).

The experiments reported in this study constitute a preliminary investigation into the possible hypotensive effect of the Jamaican Cho-Cho (Sechium edule). Experiments were conducted in a random and blind fashion on two sub species of Sechium edule. Both the pulp and the peel were examined for hypotensive activity. Water-soluble extracts were prepared from these components of the fruit and injected into anaesthetised rats. Various cardiovascular parameters were measured including heart rate, mean arterial pressure (MAP) and several ECG intervals. We report that all extracts tested produced a fall in blood pressure with little change in ECG intervals. Extract B produced the least change in heart rate with a fall in MAP of approximately 23 mmHg. Changes in heart rate with all extracts appeared to be minimal as an ED25 value could only be determined for extract A, and ED10 values could not be evaluated for extracts C and D. The mechanism(s) by which these extracts produce their hypotensive effects could not be determined in these preliminary experiments. However, it appears not to involve direct effects on cardiac tissue. This conclusion is based on the finding that it took a minimum of 10 to 15 seconds for the hypotensive action to manifest post bolus. Future experiments will be aimed at delineating the mechanism(s) involved in decreasing MAP.

Topical use of papaya in chronic skin ulcer therapy in Jamaica.

The objective of the study was to determine the prevalence of the use of the fruit (papaya) of Carica papaya as topical ulcer dressings by registered nurses in the Spanish Town Hospital (STH), Kingston Public Hospital (KPH) and the University Hospital of the West Indies (UHWI), Jamaica. A ten-item pretested self-administered questionnaire was distributed to 285 randomly selected registered nurses at the UHWI, KPH and STH. There was a 72% response rate. The prevalence of topical papaya use among the respondents was 75%. Comments from the users of papaya suggested that topical application of the unripe fruit promoted desloughing, granulation and healing and reduced odour in chronic skin ulcers. It was cost effective. Papaya was considered to be more effective than other topical applications in the treatment of chronic ulcers. There was some difficulty in preparation of the fruit and occasionally a sensation of burning was reported by the patients. There was concern about the use of a non-sterile, non-standardised procedure but there were no reports of wound infection from its use. Papaya is widely used by nurses as a form of dressing for chronic ulcers and there is need for standardisation of its preparation and application.

Topical use of Papaya in chronic skin ulcer therapy in Jamaica

The objective of the study was to determine the prevalence of the use of the fruit (papaya) or Carica papaya as topical ulcer dressings by registered nurses in the Spanish Town Hospital (STH), Kingston Public Hospital (KPH) and the University Hospital of the West Indies (UHWI), Jamaica. A ten-item pre-tested self-administered questionnaire was distributed to 285 randomly selected registered nurses at the UHWI, KPH and STH. There was a 72 percent response rate. The prevalence of topical papaya use among the respondents was 75 percent. Comments from the users of papaya suggested that topical application of the unripe fruit promoted desloughing, granulation and healing and reduced odour in chronic skin ulcers. It was cost effective. Papaya was considered to be more effective than other topical applications in the treatment of chronic ulcers. There was some difficulty in preparation of the fruit and occasionally a standardised procedure but there were no reports of wound infection from its use. Papaya is widely used by nurses as a form of dressing for chronic ulcers and there is need for standardisation of its preparation and application.(Au)

The antihypertensive effects of the Jamaican Cho-Cho (Sechium edule)

The experiments reported in this study constitute a preliminary investigation into the possible hypotensive effect of the Jamaican Cho-Cho (Sechium edule). Experiments were conducted in a random and blind fashion on two sub species of Sechium edule. Both the pulp and the peel were examined for hypotensive activity. Water-soluble extracts were prepared from these components of the fruit and injected into anaesthetised rats. Various cardiovascular parameters were measured including heart rate, mean arterial pressure (MAP) and several ECG intervals. We report that all extracts tested produced a fall in blood pressure with little change in ECG intervals. Extract B produced the least change in heart rate with a fall in MAP of approximately 23 mmHg. Changes in heart rate with all extracts appeared to be minimal as an ED25 value could only be determined for extract A, and ED10 values could not be evaluated for extracts C and D. The mechanism(s) by which these extracts produce their hypotensive effects could not be determined in these preliminary experiments. However, it appears not to involve direct effects on cardiac tissue. This conclusion is based on the finding that it took a minimum of 10 to 15 seconds for the hypotensive action to manifest post bolus. Future experiments will be aimed at delineating the mechanism(s) involved in decreasing MAP.(Au)

Ensayo clínico controlado con suero oral con sabor a frutas en niños deshidratados por diarrea aguda / A salty tasting solution vs flavored formula in the treatment of diarrhea-associated dehydratation. A clinical controlled trial

Introducción. El sabor salado del suero oral (SO) puede limitar su uso. Objetivo: conocer la preferencia por varios sabores de frutas del SO: manzana, limón, naranja, piña o lima-limón y evaluar su eficacia para rehidratar niños con diarrea. Material y métodos. Cincuenta madres escogieron libremente el sabor. Posteriormente se distribuyeron al azar en 2 grupos, 230 niños deshidratados por diarrea, rehidratados con SO de sabor salado (SO) o con SO con sabor a diferentes frutas (SOF).Resultados. La preferencia de sabor fue: manzana 68 por ciento, limón 14 por ciento, piña 8 por ciento, naranja 8 por ciento, sin sabor 2 por ciento y lima-limón 0 por ciento. En el grupo SO y SOF fueron semejantes: la edad de los niños (10.5 ñ 8.2 y 11.1 ñ 7.2 meses), el porcentaje de deshidratación (3.9 ñ 2.6 y 4.2 ñ 2.4) y de sexo masculino (62 y 54 por ciento), respectivamente; al igual que la evolución con el tratamiento: ingesta de 21.8 ñ 5.6 y 20.9 ñ 5.1 mL/kg/hora, tiempo de hidratación 5.1 ñ 2.7 y 4.9 ñ 2.3 horas; gasto fecal 10.5 ñ 8.2 y 9.3 ñ 8.2 g/kg/hora, proporción de pacientes con vómitos 28 y 34 por ciento, respectivamente. Con el sabor naranja se observó la mayor proporción de vómitos (53 por ciento). En el grupo SO se observaron 15 fracasos (13 por ciento), 14 por gasto fecal alto y 1 por vómito persistente; en el grupo SOF, hubieron 13 fracasos (11.3 por ciento) 12 por gasto fecal alto y 1 por vómito persistente, aunque finalmente todos se hidrataron mediante el uso de atole de arroz o de gastroclisis. Conclusión. El SOF es igualmente aceptado, efectivo y seguro que el SO, en niños deshidratados por diarrea. El sabor preferido fue el de manzana y el que se asoció con más vómitos, el de naranja.

Diet and lung cancer: a new approach.

Lung cancer is one of major public health problems facing the world today, owing to the high incidence of the disease and its poor prognosis. Although the principal cause of lung cancer is tobacco use, smokers find it extremely difficult to quit the habit. Hence, there is a need to take action targeted at other risk factors for this disease. One such factor is diet, which is known to be able to raise or lower the risk of lung cancer. This paper seeks to complement other reviews in the field and to shed more light both on the influence that dietary factors may have upon the occurrence of this neoplasm and on the causes of this possible effect.