Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 21
Filtrar
Más filtros

Bases de datos
País/Región como asunto
Tipo del documento
Intervalo de año de publicación
1.
J Int Soc Sports Nutr ; 19(1): 239-257, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35813842

RESUMEN

Background: Excessive production of free radicals caused by many types of exercise results in oxidative stress, which leads to muscle damage, fatigue, and impaired performance. Supplementation with royal jelly (RJ) or coenzyme Q10 (CoQ10) has been shown to attenuate exercise-induced oxidant stress in damaged muscle and improve various aspects of exercise performance in many but not all studies. Nevertheless, the effects of treatments based on RJ plus CoQ10 supplementation, which may be potentially beneficial for reducing oxidative stress and enhancing athletic performance, remain unexplored. This study aimed to examine whether oral RJ and CoQ10 co-supplementation could improve high-intensity interval exercise (HIIE) performance in swimmers, inhibiting exercise-induced oxidative stress and muscle damage. Methods: Twenty high-level swimmers were randomly allocated to receive either 400 mg of RJ and 60 mg of CoQ10 (RJQ) or matching placebo (PLA) once daily for 10 days. Exercise performance was evaluated at baseline, and then reassessed at day 10 of intervention, using a HIIE protocol. Diene conjugates (DC), Schiff bases (SB), and creatine kinase (CK) were also measured in blood plasma and saliva before and immediately after HIIE in both groups. Results: HIIE performance expressed as number of points according to a single assessment system developed and approved by the International Swimming Federation (FINA points) significantly improved in RJQ group (p = 0.013) compared to PLA group. Exercise-induced increase in DC, SB, and CK levels in plasma and saliva significantly diminished only in RJQ group (p < 0.05). Regression analysis showed that oral RJQ administration for 10 days was significantly associated with reductions in HIIE-induced increases in plasmatic and salivary DC, SB, and CK levels compared to PLA. Principal component analysis revealed that swimmers treated with RJQ are grouped by both plasmatic and salivary principal components (PC) into a separate cluster compared to PLA. Strong negative correlation between the number of FINA points and plasmatic and salivary PC1 values was observed in both intervention groups. Conclusion: The improvements in swimmers' HIIE performance were due in significant part to RJQ-induced reducing in lipid peroxidation and muscle damage in response to exercise. These findings suggest that RJQ supplementation for 10 days is potentially effective for enhancing HIIE performance and alleviating oxidant stress. Abbreviations: RJ, royal jelly; CoQ10, coenzyme Q10; HIIE, high-intensity interval exercise; DC, diene conjugates; SB, Schiff bases; CK, creatine kinase; RJQ, royal jelly plus coenzyme Q10; PLA, placebo; FINA points, points according to a single assessment system developed and approved by the International Swimming Federation; ROS, reactive oxygen species; 10H2DA, 10-hydroxy-2-decenoic acid; AMPK, 5'-AMP-activated protein kinase; FoxO3, forkhead box O3; MnSOD, manganese-superoxide dismutase; CAT, catalase; E, optical densities; PCA, principal component analysis; PC, principal component; MCFAs, medium-chain fatty acids; CaMKKß, Ca2+/calmodulin-dependent protein kinase ß; TBARS, thiobarbituric acid reactive substances; MDA, malondialdehyde.


Asunto(s)
Estrés Oxidativo , Bases de Schiff , Biomarcadores , Creatina Quinasa , Suplementos Dietéticos , Ácidos Grasos , Músculos , Oxidantes/farmacología , Proyectos Piloto , Plasma , Poliésteres/farmacología , Bases de Schiff/farmacología , Natación , Ubiquinona/análogos & derivados
2.
Artículo en Inglés | MEDLINE | ID: mdl-34574676

RESUMEN

Exercise generates reactive oxygen species (ROS), creating a redox imbalance towards oxidation when inadequately intense. Normobaric and hyperbaric oxygen (HBO) breathed while not exercising induces antioxidant enzymes expression, but literature is still poor. Twenty-two athletes were assigned to five groups: controls; 30%, or 50% O2; 100% O2 (HBO) at 1.5 or 2.5 atmosphere absolute (ATA). Twenty treatments were administered on non-training days. Biological samples were collected at T0 (baseline), T1 (end of treatments), and T2 (1 month after) to assess ROS, antioxidant capacity (TAC), lipid peroxidation, redox (amino-thiols) and inflammatory (IL-6, 10, TNF-α) status, renal function (i.e., neopterin), miRNA, and hemoglobin. At T1, O2 mixtures and HBO induced an increase of ROS, lipid peroxidation and decreased TAC, counterbalanced at T2. Furthermore, 50% O2 and HBO treatments determined a reduced state in T2. Neopterin concentration increased at T1 breathing 50% O2 and HBO at 2.5 ATA. The results suggest that 50% O2 treatment determined a reduced state in T2; HBO at 1.5 and 2.5 ATA similarly induced protective mechanisms against ROS, despite the latter could expose the body to higher ROS levels and neopterin concentrations. HBO resulted in increased Hb levels and contributed to immunomodulation by regulating interleukin and miRNA expression.


Asunto(s)
Oxigenoterapia Hiperbárica , MicroARNs , Humanos , Inflamación , Estrés Oxidativo , Oxígeno
3.
Nutrients ; 13(5)2021 May 06.
Artículo en Inglés | MEDLINE | ID: mdl-34066564

RESUMEN

Body contouring surgery after the massive weight loss due to bariatric surgery deals with different kinds of complications. The aim of this review is to analyze the role that some nutrients may play in tissue healing after surgery, thus helping plastic surgeons to improve the aesthetic and health outcomes in massive weight loss patients under a multidisciplinary approach. As a matter of fact, preoperative nutritional deficiencies have been shown for vitamins and minerals in a large percentage of post-bariatric patients. Preoperative deficiencies mainly concern iron, zinc, selenium, and vitamins (both fat-soluble and water-soluble), but also total protein. During the postoperative period, these problems may increase because of the patients' very low intake of vitamins and minerals after bariatric surgery (below 50% of the recommended dietary allowance) and the patients' low compliance with the suggested multivitamin supplementation (approximately 60%). In the postoperative period, more attention should be given to nutritional aspects in regard to the length of absorptive area and the percentage of weight loss.


Asunto(s)
Cirugía Bariátrica/efectos adversos , Suplementos Dietéticos , Desnutrición/terapia , Apoyo Nutricional/métodos , Complicaciones Posoperatorias , Tejido Adiposo/metabolismo , Adulto , Contorneado Corporal , Femenino , Humanos , Masculino , Desnutrición/etiología , Obesidad Mórbida/complicaciones , Obesidad Mórbida/metabolismo , Obesidad Mórbida/cirugía , Piel/metabolismo , Pérdida de Peso/fisiología
4.
Medicina (Kaunas) ; 57(6)2021 May 31.
Artículo en Inglés | MEDLINE | ID: mdl-34072641

RESUMEN

Even though scientific literature shows numerous heath complications and performance decrements associated with rapid weight loss (RWL), its prevalence remains exceedingly high across various combat sports. The aim of this study was to thoroughly search the existing literature to explore the influence of RWL on kidney function in Olympic and non-Olympic combat sport athletes. PubMed and Web of Science were searched for the relevant studies. Only original articles published from 2005 onwards, written in English, that included healthy males and females who prompted ~5% weight loss within a week or less, were included in the study. Retrieved studies showed that creatinine, blood urea nitrogen and urine specific gravity values were significantly increased after RWL in the majority of the included studies. This observation indicates that RWL caused dehydration and subsequent acute kidney damage despite various degrees of weight lost during the RWL phase, which can lead to adverse events in other body systems. Alternative methods of weight reduction that prioritize athletes' health should be considered.


Asunto(s)
Artes Marciales , Pérdida de Peso , Atletas , Peso Corporal , Femenino , Humanos , Riñón , Masculino
5.
Nutrients ; 12(6)2020 Jun 05.
Artículo en Inglés | MEDLINE | ID: mdl-32516959

RESUMEN

We aim to investigate the effect of 6 weeks of betaine supplementation on body composition and muscle performance during CrossFit© training. Twenty-nine subjects matched for training status (4.16 0.95 day/week) and body fat mass (12.66 4.08%) were randomly assigned to a betaine (BET; N = 14) or placebo group (PLA; N = 15). Body composition and cellular hydration were estimated with skinfolds measurement and bioelectrical impendence before and after 6 weeks of training. Muscle performance was assessed using three different tests: 3-RM back-squat for muscle strength, 2 km rowing test for aerobic capacity and Bergeron Beep Test for anaerobic capacity. Muscle strength assessed during back squat significantly increased in BET (p = 0.04) but not in the PLA group, however, there were no statistical differences between groups. Although not significant, fat mass was reduced in BET compared to PLA. Overall, body composition and cell hydration measurements did not change in response to training or betaine supplementation. Short-term (6 weeks) betaine supplementation supports muscle strength but was not ergogenic for trained subjects to aerobic and anaerobic performance in the CrossFit©-specific test.


Asunto(s)
Betaína/administración & dosificación , Betaína/farmacología , Suplementos Dietéticos , Fuerza Muscular/efectos de los fármacos , Músculo Esquelético/patología , Acondicionamiento Físico Humano/fisiología , Adolescente , Adulto , Composición Corporal/efectos de los fármacos , Método Doble Ciego , Femenino , Humanos , Hipertrofia , Masculino , Rendimiento Físico Funcional , Factores de Tiempo , Adulto Joven
6.
Nutrients ; 12(5)2020 Apr 26.
Artículo en Inglés | MEDLINE | ID: mdl-32357500

RESUMEN

Rapid weight loss (RWL) is commonly practiced among judo athletes. Although it helps them to gain the advantage over their lighter opponents, previous studies have shown that RWL can have a negative impact on the athlete's performance and overall well-being. This systematic review aimed to synthesize the evidence that examines the influence of rapid weight loss on physiological parameters, biomarkers, and psychological well-being in judo athletes. We followed the preferred reporting items for systematic reviews and meta-analyses guidelines. We searched for studies on Web of Science and PubMed that elaborate on the influence of ≥5% RWL achieved over ≤7-day period in judokas. Out of 52 studies initially found, 14 studies met our eligibility criteria and were included in the review. In total, we examined data from 1103 judo athletes. Retrieved studies showed conflicting data concerning physiological parameters and biomarkers, while psychological well-being parameters were more consistent than physiological and biomarkers. The feeling of tension, anger, and fatigue significantly increased while a decrease in vigor was demonstrated among athletes who lost weight rapidly. The evidence on the impact of RWL on performance remains ambiguous. More studies under standardized conditions are needed in order to provide firm evidence. Considering the harmful effects of RWL outlined in the existing literature, it is important to determine and monitor athlete's minimal competitive weight to prioritize the health and safety of the athlete, emphasize fairness, and ultimately benefit the sport.


Asunto(s)
Atletas/psicología , Rendimiento Atlético/fisiología , Rendimiento Atlético/psicología , Artes Marciales/fisiología , Artes Marciales/psicología , Pérdida de Peso , Programas de Reducción de Peso/métodos , Adulto , Ira , Fatiga , Humanos , Masculino , Estrés Psicológico , Factores de Tiempo , Adulto Joven
7.
J Transl Med ; 18(1): 142, 2020 03 30.
Artículo en Inglés | MEDLINE | ID: mdl-32228627

RESUMEN

OBJECTIVE: To observe the effect of rapid weight loss (RWL) methods over 3 days on muscle damage in judokas. METHODS: Eighteen judokas participated in this crossover study, meaning that judo athletes were subjected to exercise-only phase (4 days) and RWL phase (3 days). Subjects were tested for myoglobin, creatine kinase, aldolase, hemoglobin, and hematocrit values on seven consecutive days. These biomarkers served as indicators of acute muscle damage. RESULTS: During the exercise-only phase, no significant changes were observed. Myoglobin (Mb) (p < 0.001), creatine kinase (CK) (p < 0.001) and aldolase (ALD) (p < 0.001) significantly increased only during the RWL phase, as well as hemoglobin (Hb) (p < 0.001) and hematocrit (Hct) (p < 0.005) values. It was detected that peak values for muscle damage biomarkers were reached on the sixth day, while Hct and Hb values were the highest on the seventh day of the study. CONCLUSION: Our study showed significant muscle damage induced by RWL. The prevalence of RWL use by judokas is high but firm scientific evidence is lacking in the evaluation of the current practice of it. Therefore, further knowledge must be gained to evaluate the effectiveness of RWL on performance and its impact on judokas' wellbeing.


Asunto(s)
Artes Marciales , Pérdida de Peso , Atletas , Estudios Cruzados , Humanos , Músculo Esquelético
8.
J Funct Morphol Kinesiol ; 5(2)2020 Apr 02.
Artículo en Inglés | MEDLINE | ID: mdl-33467241

RESUMEN

We are glad to introduce the Second Journal Club of Volume Five, Second Issue. This edition is focused on relevant studies published in the last few years in the field of resistance training, chosen by our Editorial Board members and their colleagues. We hope to stimulate your curiosity in this field and to share with you the passion for the sport, seen also from the scientific point of view. The Editorial Board members wish you an inspiring lecture.

9.
Eur J Transl Myol ; 27(1): 6247, 2017 Feb 24.
Artículo en Inglés | MEDLINE | ID: mdl-28458804

RESUMEN

The purpose of this study was to report and analyze the practices adopted by bodybuilders in light of scientific evidence and to propose evidence-based alternatives. Six (four male and two female) bodybuilders and their coaches were directly interviewed. According to the reports, the quantity of anabolic steroids used by the men was 500-750 mg/week during the bulking phase and 720-1160 mg during the cutting phase. The values for women were 400 and 740 mg, respectively. The participants also used ephedrine and hydrochlorothiazide during the cutting phase. Resistance training was designed to train each muscle once per week and all participants performed aerobic exercise in the fasted state in order to reduce body fat. During the bulking phase, bodybuilders ingested ~2.5 g of protein/kg of body weight. During the cutting phase, protein ingestion increased to ~3 g/kg and carbohydrate ingestion decreased by 10-20%. During all phases, fat ingestion corresponded to ~15% of the calories ingested. The supplements used were whey protein, chromium picolinate, omega 3 fatty acids, branched chain amino acids, poly-vitamins, glutamine and caffeine. The men also used creatine in the bulking phase. In general, the participants gained large amounts of fat-free mass during the bulking phase; however, much of that fat-free mass was lost during the cutting phase along with fat mass. Based on our analysis, we recommend an evidence-based approach by people involved in bodybuilding, with the adoption of a more balanced and less artificial diet. One important alert should be given for the combined use of anabolic steroids and stimulants, since both are independently associated with serious cardiovascular events. A special focus should be given to revisiting resistance training and avoiding fasted cardio in order to decrease the reliance on drugs and thus preserve bodybuilders' health and integrity.

10.
J Enzyme Inhib Med Chem ; 32(1): 707-711, 2017 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-28385082

RESUMEN

Hyperbaric oxygen therapy (HBOT) has beneficial effects on avascular necrosis of femoral head (ANFH), but its mechanism of action is still unclear. We investigated if HBOT upregulates serum osteoprotegerin (OPG) and/or inhibits osteoclast activation. 23 patients with unilateral ANFH at stage I, II and III consented to the study: the patients received standard HBOT. Serum OPG levels were obtained at the beginning of HBOT (T0), after 15 sessions (T1), 30 sessions (T2), after a 30-day break (T3), and after 60 sessions (T4). Magnetic resonance imaging (MRI) was obtained at T0 and about one year from the end of HBO treatments. Lesion size was compared between pre- and post-HBOT. 19 patients completed the study. HBOT reduced pain symptoms in all patients. HBOT significantly reduced lesion size in all stage I and II patients and in 2 of 11 stage III patients. HBOT increased serum OPG levels but receptor activator of nuclear factor kappa-B ligand (RANKL) levels did not change.


Asunto(s)
Necrosis de la Cabeza Femoral/sangre , Necrosis de la Cabeza Femoral/terapia , Oxigenoterapia Hiperbárica , Osteoprotegerina/sangre , Ligando RANK/sangre , Femenino , Humanos , Imagen por Resonancia Magnética , Masculino , Persona de Mediana Edad , Osteoclastos/efectos de los fármacos , Osteoclastos/metabolismo , Osteoprotegerina/metabolismo
11.
J Med Food ; 19(11): 1085-1095, 2016 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-27754766

RESUMEN

The aim of this study was to analyze the effects on blood sugar concentrations through the calculation of the glycemic score (GS) of 10 different high-protein low-carbohydrates (CHOs) proprietary foods that are commonly used as meals during very low-CHO ketogenic diets or during low-CHO diets. Fourteen healthy females were tested for their glycemic response curve elicited by 1000 kJ of glucose three times within a 3-week period (one test each week) compared with one of 10 test foods once on separate days twice a week. After determining the GS of each food in each individual, the mean GS of each test food was calculated. All test foods, compared with glucose, produced a significantly lower glycemic response. The GS of all test food resulted in being lower than 25 and the difference between the mean glycemia after the intake of glucose (mean 122 ± 15 mg/dL) and after the intake of the sweet test foods (mean 89 ± 7 mg/dL) was 33 mg/dL (P < .001), whereas the difference between the mean glycemia after the intake of glucose and after the intake of savory test foods (mean 91 ± 8 mg/dL) was of 31 mg/dL (P < .001). CONCLUSIONS: The reformulation of ultraprocessed ready-to-consume foods in a low-CHO, high-protein version can produce a significantly lower glycemic response whilst maintaining the valued ready-to-use format and high palatability demanded by consumers. The low impact on postprandial glycemia and the nutritional characteristics of these proprietary foods makes them useful in both weight control management strategies and in the care management of diabetes.


Asunto(s)
Glucemia/metabolismo , Carbohidratos de la Dieta/administración & dosificación , Proteínas en la Dieta/administración & dosificación , Adulto , Dieta , Ingestión de Alimentos , Ingestión de Energía , Femenino , Índice Glucémico , Voluntarios Sanos , Humanos , Persona de Mediana Edad , Periodo Posprandial
12.
Diving Hyperb Med ; 46(3): 155-159, 2016 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-27723016

RESUMEN

INTRODUCTION: Some patients admitted to the intensive care unit (ICU) might require repetitive hyperbaric oxygen treatment (HBOT) while receiving critical care. In such cases, the presence of a hyperbaric chamber located inside or near an ICU is preferable; however, this set-up is not always possible. In Padua, the "Associazione Tecnici IPerbarici" hyperbaric centre is a stand-alone facility outside of a hospital. Despite this, selected ICU patients receive HBOT at this facility. METHODS: We retrospectively reviewed the medical records from 2003 to 2013 of 75 consecutive, critically-ill patients, 28 of whom were initially intubated and mechanically ventilated whilst undergoing HBOT. We evaluated the methods adopted in Padua to guarantee the safety and continuity of care during transfer for and during HBOT in this specially-equipped multiplace chamber. RESULTS: The 75 patients collectively received 315 HBOT sessions, 192 of which were with the patients intubated and mechanically ventilated. The diagnoses ranged from necrotizing fasciitis to post-surgical sepsis and intracranial abscess. We obtained full recovery for 73 patients. Two deaths were recorded not in close time relation to HBOT. CONCLUSIONS: With meticulous monitoring, efficient transport and well-trained personnel, the risks associated with transportation and HBOT can be acceptable for the referring physician.


Asunto(s)
Cuidados Críticos/normas , Enfermedad Crítica/terapia , Oxigenoterapia Hiperbárica , Seguridad del Paciente/normas , Transporte de Pacientes/normas , Adulto , Absceso Encefálico/terapia , Protocolos Clínicos , Cuidados Críticos/métodos , Fascitis Necrotizante/terapia , Femenino , Gangrena Gaseosa/terapia , Instituciones de Salud , Humanos , Oxigenoterapia Hiperbárica/estadística & datos numéricos , Italia , Masculino , Persona de Mediana Edad , Monitoreo Fisiológico , Complicaciones Posoperatorias/terapia , Sepsis/terapia , Transporte de Pacientes/estadística & datos numéricos
13.
Undersea Hyperb Med ; 43(4): 473-476, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-28763178

RESUMEN

A patient suffered from an envenomation that, at his hospitalization, was judged severe: Grade 3 out of 3, as defined in clinical studies for CroFab™ antidote [Crotalidae Polyvalent Immune Fab (Ovine)]. In addition to the usual antivenom treatment we applied adjunctive hyperbaric oxygen (HBO2) therapy. Our aim was to facilitate better control of the lesions, already presenting as problematic wounds and at high risk of necrotizing soft tissue infection with compartment aspects. The regimen consisted of six treatments, one daily at 2.4 atmospheres absolute at 25 minutes x3 (75 minutes) at FiO2=1, with two five-minute air breaks interposed. The therapy was well tolerated in spite of the patient's declared trait of claustrophobia. Our findings at a long-term follow up suggest that HBO2 therapy may be reasonably and effectively administered at least in the post-acute phase of such occurrences.


Asunto(s)
Antivenenos/uso terapéutico , Terapia Combinada/métodos , Crotalus , Traumatismos de la Mano/terapia , Oxigenoterapia Hiperbárica , Fragmentos Fab de Inmunoglobulinas/uso terapéutico , Mordeduras de Serpientes/terapia , Animales , Antibacterianos/uso terapéutico , Traumatismos de la Mano/etiología , Humanos , Masculino , Persona de Mediana Edad
14.
Lung ; 193(6): 939-45, 2015 12.
Artículo en Inglés | MEDLINE | ID: mdl-26410589

RESUMEN

PURPOSE: The effects of the ketogenic diet (KD) on weight loss, metabolic, and respiratory parameters were investigated in healthy subjects. METHODS: Thirty-two healthy subjects were randomized into two groups. The KD group followed a ketogenic diet for 20 days (KD t 0-t 20), then switched to a low-carbohydrate, no-ketogenic diet for 20 days (KD t 20-t 40), and finally was on a Mediterranean diet (MD) for 2 more months (KD t 40-t 2m). The MD group followed a MD for 20 days (MD t 0-t 20), then followed a MD of 1400 kcal over the next 20 days (MD t 20-t 40), and completed the study with the MD for 2 months (MD t 40-t 2m). Body weight, body fat, respiratory rate, and respiratory gas parameters (including respiratory exchange ratio (RER) and carbon dioxide end-tidal partial pressure (PETCO2), oxygen uptake (VO2), carbon dioxide production (VCO2), and resting energy expenditure (REE)) were measured at each point. RESULTS: A significant decrease (p < 0.05) in RER was observed after 20 and 40 days in the KD group, but not in the MD group. In the KD group, significant reductions were observed for both carbon dioxide output and PETCO2, however, there was no significant change in VO2, VCO2, and REE. While both diets significantly decreased body fat mass, the KD diet overall proved to have a higher percentage of fat loss versus the MD diet. CONCLUSION: The KD may significantly decrease carbon dioxide body stores, which may theoretically be beneficial for patients with increased carbon dioxide arterial partial pressure due to respiratory insufficiency or failure.


Asunto(s)
Restricción Calórica , Dióxido de Carbono/metabolismo , Dieta Baja en Carbohidratos , Dieta Cetogénica , Dieta Mediterránea , Metabolismo Energético , Consumo de Oxígeno , Intercambio Gaseoso Pulmonar , Frecuencia Respiratoria , Tejido Adiposo/efectos de los fármacos , Adulto , Peso Corporal/efectos de los fármacos , Metabolismo Energético/efectos de los fármacos , Femenino , Voluntarios Sanos , Humanos , Persona de Mediana Edad , Consumo de Oxígeno/efectos de los fármacos , Presión Parcial , Extractos Vegetales/farmacología , Intercambio Gaseoso Pulmonar/efectos de los fármacos , Frecuencia Respiratoria/efectos de los fármacos
15.
J Bodyw Mov Ther ; 19(2): 362-9, 2015 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-25892393

RESUMEN

The aim of this study was to evaluate a new method to perform the one repetition maximum (1RM) bench press test, by combining previously validated predictive and practical procedures. Eight young male and 7 females participants, with no previous experience of resistance training, performed a first set of repetitions to fatigue (RTF) with a workload corresponding to ⅓ of their body mass (BM) for a maximum of 25 repetitions. Following a 5-min recovery period, a second set of RTF was performed with a workload corresponding to ½ of participants' BM. The number of repetitions performed in this set was then used to predict the workload to be used for the 1RM bench press test using Mayhew's equation. Oxygen consumption, heart rate and blood lactate were monitored before, during and after each 1RM attempt. A significant effect of gender was found on the maximum number of repetitions achieved during the RTF set performed with ½ of participants' BM (males: 25.0 ± 6.3; females: 11.0x± 10.6; t = 6.2; p < 0.001). The 1RM attempt performed with the workload predicted by Mayhew's equation resulted in females performing 1.2 ± 0.7 repetitions, while males performed 4.8 ± 1.9 repetitions. All participants reached their 1RM performance within 3 attempts, thus resulting in a maximum of 5 sets required to successfully perform the 1RM bench press test. We conclude that, by combining previously validated predictive equations with practical procedures (i.e. using a fraction of participants' BM to determine the workload for an RTF set), the new method we tested appeared safe, accurate (particularly in females) and time-effective in the practical evaluation of 1RM performance in inexperienced individuals.


Asunto(s)
Fuerza Muscular/fisiología , Músculo Esquelético/fisiología , Modalidades de Fisioterapia , Levantamiento de Peso/fisiología , Adulto , Femenino , Frecuencia Cardíaca , Humanos , Ácido Láctico/sangre , Masculino , Consumo de Oxígeno , Resistencia Física/fisiología , Proyectos Piloto , Reproducibilidad de los Resultados , Factores Sexuales
16.
Mar Drugs ; 13(2): 996-1009, 2015 Feb 13.
Artículo en Inglés | MEDLINE | ID: mdl-25689563

RESUMEN

BACKGROUND: the ketogenic diet (KD) has become a widely used nutritional approach for weight loss. Some of the KD's positive effects on metabolism and cardiovascular risk factors are similar to those seen after n-3 polyunsaturated fatty acids (ω-3) supplementation. We hypothesized that a ketogenic Mediterranean diet with phytoextracts combined with ω-3 supplementation may have increased positive effects on cardiovascular risk factors and inflammation. METHODS: We analyzed 34 male overweight subjects; aged between 25 and 65 years who were overall healthy apart from overweight. The subjects followed a ketogenic diet protocol for four weeks; with (KDO3) or without (KD) ω-3 supplementation. RESULTS: All subjects experienced a significant loss of body weight and body fat and there was no significant differences between treatment (body weight: KD-4.7 kg, KDO3-4.03 kg, body fat KD-5.41 kg, KDO3-5.86 kg). There were also significant decreases in total cholesterol, LDL-c, and glucose levels. Triglycerides and insulin levels decreased more in KDO3 vs. KD subjects, with a significant difference. All the investigated inflammatory cytokines (IL-1ß, IL-6, TNF-α) decreased significantly in KDO3 subjects whilst only TNF-α showed a significant decrease in KD subjects over the 12 month study period. No significant changes were observed in anti-inflammatory cytokines (IL-10 and IL-1Ra), creatinine, urea and uric acid. Adiponectin increased significantly only in the KDO3 group. CONCLUSIONS: ω-3 supplementation improved the positive effects of a ketogenic Mediterranean diet with phytoextracts on some cardiovascular/metabolic risk factors and inflammatory state.


Asunto(s)
Enfermedades Cardiovasculares/prevención & control , Dieta Cetogénica , Dieta Mediterránea , Suplementos Dietéticos , Ácidos Grasos Omega-3/farmacología , Adiposidad/efectos de los fármacos , Adulto , Anciano , Glucemia/metabolismo , LDL-Colesterol/sangre , Citocinas/sangre , Humanos , Insulina/sangre , Masculino , Persona de Mediana Edad , Sobrepeso/dietoterapia , Extractos Vegetales/uso terapéutico , Factores de Riesgo , Triglicéridos/sangre , Pérdida de Peso
17.
J Med Food ; 18(1): 137-43, 2015 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-25133710

RESUMEN

Myostatin (MSTN) is a negative regulator of muscle growth even if some studies have shown a counterintuitive positive correlation between MSTN and muscle mass (MM). Our aim was to investigate the influence of 2 months of resistance training (RT) and diets with different protein contents on plasma MSTN, interleukin 1 beta (IL-1ß), interleukin 6 (IL-6), tumor necrosis factor alpha (TNF-α), and insulin-like growth factor 1 (IGF-1). Eighteen healthy volunteers were randomly divided in two groups: high protein (HP) and normal protein (NP) groups. Different protein diet contents were 1.8 and 0.85 g of protein·kg bw(-1)·day(-1) for HP and NP, respectively. Subjects underwent 8 weeks of standardized progressive RT. MSTN, IGF-1, IL-1ß, IL-6, and TNF-α were analyzed before and after the first and the last training sessions. Lean body mass, MM, upper-limb muscle area, and strength were measured. Plasma MSTN showed a significant increase (P<.001) after the last training in the HP group compared with NP group and with starting value. IGF-1 plasma concentration showed a positive correlation with MSTN in HP after the last training (r(2)=0.6456; P=.0295). No significant differences were found between NP and HP for IL-1ß, IL-6, TNF-α, and strength and MM or area. These findings suggest a "paradoxical" postexercise increase of plasma MSTN after 8 weeks of RT and HP diets. This MSTN elevation correlates positively with IGF-1 plasma level. This double increase of opposite (catabolic/anabolic) mediators could explain the substantial overlapping of MM increases in the two groups.


Asunto(s)
Composición Corporal/efectos de los fármacos , Proteínas en la Dieta/administración & dosificación , Suplementos Dietéticos , Ejercicio Físico/fisiología , Músculo Esquelético/efectos de los fármacos , Miostatina/sangre , Entrenamiento de Fuerza , Adulto , Proteínas en la Dieta/farmacología , Humanos , Factor I del Crecimiento Similar a la Insulina/metabolismo , Interleucina-1beta/sangre , Interleucina-6/sangre , Masculino , Músculo Esquelético/metabolismo , Factor de Necrosis Tumoral alfa/sangre , Adulto Joven
18.
J Med Food ; 17(6): 723-9, 2014 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-24827073

RESUMEN

Chitosan (CH) is a polymer of glucosamine that is extracted from the shells of several sea fruits. It is well recognized as a nutritional supplement that is used to reduce body weight and blood lipid levels, but its clinical efficacy has not been clearly demonstrated. The true mechanism of action and physiological processes involved in these properties of CH are not yet understood or explained. The most accepted theories assume that CH reduces dietary fat absorption by trapping the fat in the gastric lumen. The very low pH of the gastric lumen induces CH jellification and, therefore, entrapment of the fats. This article describes the most plausible mechanism by which CH interferes with fat absorption in the first part of the enteric tract while interacting with cholic acids. We emphasize the weak points of the classic CH-containing formulations, which are unable to prove this theory. We also report preliminary experimental data of a new CH salt-containing formulation that is capable of effectively interfering with bile salt emulsification processes and, as a result, reducing dietary fat absorption.


Asunto(s)
Ácidos y Sales Biliares/metabolismo , Bilis/metabolismo , Quitosano/farmacología , Grasas de la Dieta/metabolismo , Hipolipemiantes/farmacología , Absorción Intestinal/efectos de los fármacos , Composición de Medicamentos , Emulsiones , Sales (Química) , Estómago
19.
Nutrients ; 5(12): 5205-17, 2013 Dec 18.
Artículo en Inglés | MEDLINE | ID: mdl-24352095

RESUMEN

Weight loss protocols can only be considered successful if they deliver consistent results over the long term-a goal which is often elusive, so much so that the term "yo-yo" is used to describe the perennial weight loss/weight regain battle common in obesity. We hypothesized that a ketogenic Mediterranean diet with phytoextracts (KEMEPHY) combined with the acknowledged health benefits of traditional Mediterranean nutrition may favor long term weight loss. We analysed 89 male and female obese subjects, aged between 25 and 65 years who were overall healthy apart from being overweight. The subjects followed a staged diet protocol over a period of 12 months: 20 day of KEMEPHY; 20 days low carb-non ketogenic; 4 months Mediterranean normocaloric nutrition; a second 20 day ketogenic phase followed by 6 months of Mediterranean normocaloric nutrition. For the majority of subjects (88.25%) there was significant loss of weight (from 100.7 ± 16.54 to 84.59 ± 9.71 kg; BMI from 35.42 ± 4.11 to 30.27 ± 3.58) and body fat (form 43.44% ± 6.34% to 33.63% ± 7.6%) during both ketogenic phases followed by successful maintenance, without weight regain, during the 6 month stabilization phase with only 8 subjects failing to comply. There were also significant and stable decreases in total cholesterol, LDLc, triglycerides and glucose levels over the 12 month study period. HDLc showed small increases after the ketogenic phases but over the full 12 months there was no significant change. No significant changes were observed in ALT, AST, Creatinine or BUN. The combination of a biphasic KEMEPHY diet separated by longer periods of maintenance nutrition, based on the traditional Mediterranean diet, led to successful long term weight loss and improvements in health risk factors in a majority of subjects; compliance was very high which was a key determinant of the results seen.


Asunto(s)
Dieta Cetogénica , Dieta Mediterránea , Obesidad/dietoterapia , Pérdida de Peso/fisiología , Adulto , Anciano , Glucemia/metabolismo , Colesterol/sangre , Carbohidratos de la Dieta/administración & dosificación , Grasas de la Dieta/administración & dosificación , Proteínas en la Dieta/administración & dosificación , Ingestión de Energía , Femenino , Humanos , Masculino , Persona de Mediana Edad , Extractos Vegetales/administración & dosificación , Estudios Retrospectivos , Triglicéridos/sangre
20.
Phys Ther Sport ; 14(4): 240-5, 2013 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-23623301

RESUMEN

OBJECTIVES: To study the effects of passive rest (PR) and sports massage with (SMOZO) and without (SM) ozonised oil on sports performance psycho-physiological indices in competitive amateur cyclists after 3 pre-fatiguing Wingate cycle and post-recovery ramp tests. DESIGN: An intra-subjects experimental design with repeated measures. SETTING: Department of Human Anatomy and Physiology, University of Padua. PARTICIPANTS: Fifteen male competitive cyclists (age: 27 ± 3.5 years, body weight: 77.6 ± 8.3 kg, height: 178 ± 7.7 cm) were studied. MAIN OUTCOME MEASURES: Subjects' power output (P), heart rate (HR), Visual Analogue Scale (VAS) score and blood lactate (BL) clearance in response to PR, SMOZO and SM recoveries were compared. RESULTS: There were no significant differences in cyclists' heart rate patterns in the three experimental conditions (p > 0.05). After SMOZO recovery, athletes showed a higher Pmax (p < 0.05) and a lower perceived fatigue VAS score (p < 0.033) in the ramp test. Blood lactate decreased more at T2 (mid-time point of treatment) and T3 (final time point of treatment) than T1 (beginning of treatment) compared to SM and PR conditions. CONCLUSIONS: These findings suggest that use of ozonised oil during sports massage increases blood lactate removal, improves performance and reduces the perception of fatigue in cyclists from 3 Wingate tests.


Asunto(s)
Rendimiento Atlético/fisiología , Ciclismo/fisiología , Masaje/métodos , Aceites/farmacología , Resistencia Física/fisiología , Recuperación de la Función/fisiología , Adulto , Metabolismo Energético , Frecuencia Cardíaca , Humanos , Masculino , Ozono
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA