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Ugrinowitsch, Carlos
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[PMID]:29324825
[Au] Autor:Damas F; Libardi CA; Ugrinowitsch C; Vechin FC; Lixandrão ME; Snijders T; Nederveen JP; Bacurau AV; Brum P; Tricoli V; Roschel H; Parise G; Phillips SM
[Ad] Endereço:School of Physical Education and Sport, University of São Paulo, São Paulo, São Paulo, Brazil.
[Ti] Título:Early- and later-phases satellite cell responses and myonuclear content with resistance training in young men.
[So] Source:PLoS One;13(1):e0191039, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Satellite cells (SC) are associated with skeletal muscle remodelling after muscle damage and/or extensive hypertrophy resulting from resistance training (RT). We recently reported that early increases in muscle protein synthesis (MPS) during RT appear to be directed toward muscle damage repair, but MPS contributes to hypertrophy with progressive muscle damage attenuation. However, modulations in acute-chronic SC content with RT during the initial (1st-wk: high damage), early (3rd-wk: attenuated damage), and later (10th-wk: no damage) stages is not well characterized. Ten young men (27 ± 1 y, 23.6 ± 1.0 kg·m-2) underwent 10-wks of RT and muscle biopsies (vastus-lateralis) were taken before (Pre) and post (48h) the 1st (T1), 5th (T2) and final (T3) RT sessions to evaluate fibre type specific SC content, cross-sectional area (fCSA) and myonuclear number by immunohistochemistry. We observed RT-induced hypertrophy after 10-wks of RT (fCSA increased ~16% in type II, P < 0.04; ~8% in type I [ns]). SC content increased 48h post-exercise at T1 (~69% in type I [P = 0.014]; ~42% in type II [ns]), and this increase was sustained throughout RT (pre T2: ~65%, ~92%; pre T3: ~30% [ns], ~87%, for the increase in type I and II, respectively, vs. pre T1 [P < 0.05]). Increased SC content was not coupled with changes in myonuclear number. SC have a more pronounced role in muscle repair during the initial phase of RT than muscle hypertrophy resulted from 10-wks RT in young men. Chronic elevated SC pool size with RT is important providing proper environment for future stresses or larger fCSA increases.
[Mh] Termos MeSH primário: Núcleo Celular/metabolismo
Proteínas Musculares/metabolismo
Células Satélites de Músculo Esquelético/fisiologia
Levantamento de Peso
[Mh] Termos MeSH secundário: Adulto
Seres Humanos
Masculino
Células Satélites de Músculo Esquelético/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Muscle Proteins)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180112
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191039


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[PMID]:29200983
[Au] Autor:Roberts J; Zinchenko A; Suckling C; Smith L; Johnstone J; Henselmans M
[Ad] Endereço:Cambridge Centre for Sport and Exercise Sciences, Anglia Ruskin University, East Road, Cambridge, UK.
[Ti] Título:The short-term effect of high versus moderate protein intake on recovery after strength training in resistance-trained individuals.
[So] Source:J Int Soc Sports Nutr;14:44, 2017.
[Is] ISSN:1550-2783
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Background: Dietary protein intakes up to 2.9 g.kg .d and protein consumption before and after resistance training may enhance recovery, resulting in hypertrophy and strength gains. However, it remains unclear whether protein quantity or nutrient timing is central to positive adaptations. This study investigated the effect of total dietary protein content, whilst controlling for protein timing, on recovery in resistance trainees. Methods: Fourteen resistance-trained individuals underwent two 10-day isocaloric dietary regimes with a protein content of 1.8 g.kg .d (PRO ) or 2.9 g.kg .d (PRO ) in a randomised, counterbalanced, crossover design. On days 8-10 (T1-T3), participants undertook resistance exercise under controlled conditions, performing 3 sets of squat, bench press and bent-over rows at 80% 1 repetition maximum until volitional exhaustion. Additionally, participants consumed a 0.4 g.kg whey protein concentrate/isolate mix 30 min before and after exercise sessions to standardise protein timing specific to training. Recovery was assessed via daily repetition performance, muscle soreness, bioelectrical impedance phase angle, plasma creatine kinase (CK) and tumor necrosis factor-α (TNF-α). Results: No significant differences were reported between conditions for any of the performance repetition count variables ( > 0.05). However, within PRO only, squat performance total repetition count was significantly lower at T3 (19.7 ± 6.8) compared to T1 (23.0 ± 7.5; = 0.006). Pre and post-exercise CK concentrations significantly increased across test days ( ≤ 0.003), although no differences were reported between conditions. No differences for TNF-α or muscle soreness were reported between dietary conditions. Phase angle was significantly greater at T3 for PRO (8.26 ± 0.82°) compared with PRO (8.08 ± 0.80°; = 0.012). Conclusions: When energy intake and peri-exercise protein intake was controlled for, a short term PRO diet did not improve markers of muscle damage or soreness in comparison to a PRO approach following repeated days of intensive training. Whilst it is therefore likely that moderate protein intakes (1.8 g.kg .d ) may be sufficient for resistance-trained individuals, it is noteworthy that both lower body exercise performance and bioelectrical phase angle were maintained with PRO . Longer term interventions are warranted to determine whether PRO intakes are sufficient during prolonged training periods or when extensive exercise (e.g. training twice daily) is undertaken.
[Mh] Termos MeSH primário: Proteínas na Dieta/administração & dosagem
Proteínas na Dieta/farmacologia
Suplementos Nutricionais
Músculo Esquelético/efeitos dos fármacos
Músculo Esquelético/fisiologia
Treinamento de Resistência
Levantamento de Peso
[Mh] Termos MeSH secundário: Adulto
Estudos Cross-Over
Feminino
Seres Humanos
Masculino
Contração Muscular
Músculo Esquelético/metabolismo
Resistência Física
Fenômenos Fisiológicos da Nutrição Esportiva
Levantamento de Peso/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Nm] Nome de substância:
0 (Dietary Proteins)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171205
[St] Status:MEDLINE
[do] DOI:10.1186/s12970-017-0201-z


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[PMID]:28097928
[Au] Autor:Balsalobre-Fernández C; Marchante D; Muñoz-López M; Jiménez SL
[Ad] Endereço:a Department of Sport Sciences , Universidad Europea de Madrid , Madrid , Spain.
[Ti] Título:Validity and reliability of a novel iPhone app for the measurement of barbell velocity and 1RM on the bench-press exercise.
[So] Source:J Sports Sci;36(1):64-70, 2018 Jan.
[Is] ISSN:1466-447X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The purpose of this study was to analyse the validity and reliability of a novel iPhone app (named: PowerLift) for the measurement of mean velocity on the bench-press exercise. Additionally, the accuracy of the estimation of the 1-Repetition maximum (1RM) using the load-velocity relationship was tested. To do this, 10 powerlifters (Mean (SD): age = 26.5 ± 6.5 years; bench press 1RM · kg = 1.34 ± 0.25) completed an incremental test on the bench-press exercise with 5 different loads (75-100% 1RM), while the mean velocity of the barbell was registered using a linear transducer (LT) and Powerlift. Results showed a very high correlation between the LT and the app (r = 0.94, SEE = 0.028 m · s ) for the measurement of mean velocity. Bland-Altman plots (R = 0.011) and intraclass correlation coefficient (ICC = 0.965) revealed a very high agreement between both devices. A systematic bias by which the app registered slightly higher values than the LT (P < 0.05; mean difference (SD) between instruments = 0.008 ± 0.03 m · s ). Finally, actual and estimated 1RM using the app were highly correlated (r = 0.98, mean difference (SD) = 5.5 ± 9.6 kg, P < 0.05). The app was found to be highly valid and reliable in comparison with a LT. These findings could have valuable practical applications for strength and conditioning coaches who wish to measure barbell velocity in the bench-press exercise.
[Mh] Termos MeSH primário: Aplicativos Móveis
Smartphone
Levantamento de Peso/fisiologia
[Mh] Termos MeSH secundário: Adulto
Fenômenos Biomecânicos
Seres Humanos
Masculino
Força Muscular/fisiologia
Variações Dependentes do Observador
Reprodutibilidade dos Testes
Treinamento de Resistência/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180220
[Lr] Data última revisão:
180220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170119
[St] Status:MEDLINE
[do] DOI:10.1080/02640414.2017.1280610


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Registro de Ensaios Clínicos
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[PMID]:29216285
[Au] Autor:Scharf M; Oezdemir D; Schmid A; Kemmler W; von Stengel S; May MS; Uder M; Lell MM
[Ad] Endereço:Department of Radiology, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Bavaria, Germany.
[Ti] Título:Myocardial adaption to HI(R)T in previously untrained men with a randomized, longitudinal cardiac MR imaging study (Physical adaptions in Untrained on Strength and Heart trial, PUSH-trial).
[So] Source:PLoS One;12(12):e0189204, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:OBJECTIVE: Although musculoskeletal effects in resistance training are well described, little is known about structural and functional cardiac adaption in formerly untrained subjects. We prospectively evaluated whether short term high intensity (resistance) training (HI(R)T) induces detectable morphologic cardiac changes in previously untrained men in a randomized controlled magnetic resonance imaging (MRI) study. MATERIALS AND METHODS: 80 untrained middle-aged men were randomly assigned to a HI(R)T-group (n = 40; 43.5±5.9 years) or an inactive control group (n = 40; 42.0±6.3 years). HI(R)T comprised 22 weeks of training focusing on a single-set to failure protocol in 2-3 sessions/week, each with 10-13 exercises addressing main muscle groups. Repetitions were decreased from 8-10 to 3-5 during study period. Before and after HI(R)T all subjects underwent physiologic examination and cardiac MRI (cine imaging, tagging). RESULTS: Indexed left (LV) and right ventricular (RV) volume (LV: 76.8±15.6 to 78.7±14.8 ml/m2; RV: 77.0±15.5 to 78.7±15.1 ml/m2) and mass (LV: 55.5±9.7 to 57.0±8.8 g/m2; RV: 14.6±3.0 to 15.0±2.9 g/m2) significantly increased with HI(R)T (all p<0.001). Mean LV and RV remodeling indices of HI(R)T-group did not alter with training (0.73g/mL and 0.19g/mL, respectively [p = 0.96 and p = 0.87]), indicating balanced cardiac adaption. Indexed LV (48.4±11.1 to 50.8±11.0 ml/m2) and RV (48.5±11.0 to 50.6±10.7 ml/m2) stroke volume significantly increased with HI(R)T (p<0.001). Myocardial strain and strain rates did not change following resistance exercise. Left atrial volume at end systole slightly increased after HI(R)T (36.2±7.9 to 37.0±8.4 ml/m2, p = 0.411), the ratio to end-diastolic LV volume at baseline and post-training was unchanged (0.47 vs. 0.47, p = 0.79). CONCLUSION: 22 weeks of HI(R)T lead to measurable, physiological changes in cardiac atrial and ventricular morphologic characteristics and function in previously untrained men. TRIAL REGRISTRATION: The PUSH-trial is registered at the US National Institutes of Health (ClinicalTrials.gov), NCT01766791.
[Mh] Termos MeSH primário: Coração/fisiologia
Levantamento de Peso
[Mh] Termos MeSH secundário: Adulto
Estudos de Casos e Controles
Seres Humanos
Estudos Longitudinais
Masculino
Meia-Idade
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Em] Mês de entrada:1712
[Cu] Atualização por classe:180207
[Lr] Data última revisão:
180207
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171208
[Cl] Clinical Trial:ClinicalTrial
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189204


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[PMID]:28467340
[Au] Autor:Pedrazzini A; Banchi M; Bertoni N; Pedrabissi B; Simo HCY; Medina V; Bonassi P; Tocco S; Pogliacomi F
[Ad] Endereço:UO Clinica Ortopedica e Traumatologica di Parma. alessiopedrazzini@hotmail.com.
[Ti] Título:Pectoralis major tendon rupture in a weight lifter: a rare case.
[So] Source:Acta Biomed;88(1):86-90, 2017 Apr 28.
[Is] ISSN:0392-4203
[Cp] País de publicação:Italy
[La] Idioma:eng
[Ab] Resumo:Pectoralis major tendon (PMT) rupture is a rare event, and it was originally described by Patisser in 1822. The PMT is a thick lamina, which has two origins, one from the clavicle and the other from the ribcage sternum. PMT lesions are classified according to 3 levels of severity: Type 1 is contusions and strains, Type 2 is a partial tear and Type 3 is a complete tear. Diagnosis is made through a clinical examination which comprises a positive response to pain upon pressure over the axilla recess, the presence of bruising and limited motion, and is completed with an MRI. Type 3 injuries are treated exclusively through surgery, while Type 1 and 2 lesions are treated conservatively. In this article, we describe a rare case of PMT rupture in a 39-year-old weight lifter, the surgical treatment that was carried out through an open access at the Pectoralis and Deltoid junction and anchor suture, the post-surgical rehabilitation program and a 1-year follow-up assessment at which point return to sport was achieved.
[Mh] Termos MeSH primário: Músculos Peitorais/lesões
Traumatismos dos Tendões/etiologia
Levantamento de Peso/lesões
[Mh] Termos MeSH secundário: Adulto
Seres Humanos
Imagem por Ressonância Magnética
Masculino
Músculos Peitorais/diagnóstico por imagem
Músculos Peitorais/cirurgia
Ruptura/diagnóstico por imagem
Ruptura/etiologia
Ruptura/cirurgia
Traumatismos dos Tendões/diagnóstico por imagem
Traumatismos dos Tendões/cirurgia
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180125
[Lr] Data última revisão:
180125
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170504
[St] Status:MEDLINE
[do] DOI:10.23750/abm.v88i1.6177


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[PMID]:28463902
[Au] Autor:Mattocks KT; Buckner SL; Jessee MB; Dankel SJ; Mouser JG; Loenneke JP
[Ad] Endereço:Department of Health, Exercise Science, and Recreation Management, Kevser Ermin Applied Physiology Laboratory, The University of Mississippi, University, MS.
[Ti] Título:Practicing the Test Produces Strength Equivalent to Higher Volume Training.
[So] Source:Med Sci Sports Exerc;49(9):1945-1954, 2017 Sep.
[Is] ISSN:1530-0315
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PURPOSE: To determine if muscle growth is important for increasing muscle strength or if changes in strength can be entirely explained from practicing the strength test. METHODS: Thirty-eight untrained individuals performed knee extension and chest press exercise for 8 wk. Individuals were randomly assigned to either a high-volume training group (HYPER) or a group just performing the one repetition maximum (1RM) strength test (TEST). The HYPER group performed four sets to volitional failure (~8RM-12RM), whereas the TEST group performed up to five attempts to lift as much weight as possible one time each visit. RESULTS: Data are presented as mean (90% confidence interval). The change in muscle size was greater in the HYPER group for both the upper and lower bodies at most but not all sites. The change in 1RM strength for both the upper body (difference of -1.1 [-4.8, 2.4] kg) and lower body (difference of 1.0 [-0.7, 2.8] kg for dominant leg) was not different between groups (similar for nondominant). Changes in isometric and isokinetic torque were not different between groups. The HYPER group observed a greater change in muscular endurance (difference of 2 [1,4] repetitions) only in the dominant leg. There were no differences in the change between groups in upper body endurance. There were between-group differences for exercise volume (mean [95% confidence interval]) of the dominant (difference of 11,049.3 [9254.6-12,844.0] kg) leg (similar for nondominant) and chest press with the HYPER group completing significantly more total volume (difference of 13259.9 [9632.0-16,887.8] kg). CONCLUSIONS: These findings suggest that neither exercise volume nor the change in muscle size from training contributed to greater strength gains compared with just practicing the test.
[Mh] Termos MeSH primário: Teste de Esforço
Força Muscular/fisiologia
Músculo Esquelético/anatomia & histologia
Condicionamento Físico Humano/métodos
Levantamento de Peso/fisiologia
[Mh] Termos MeSH secundário: Adaptação Fisiológica
Adolescente
Adulto
Eletromiografia
Feminino
Seres Humanos
Masculino
Músculo Esquelético/fisiologia
Resistência Física/fisiologia
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180108
[Lr] Data última revisão:
180108
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170503
[St] Status:MEDLINE
[do] DOI:10.1249/MSS.0000000000001300


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[PMID]:28984784
[Au] Autor:Lee TW; Bae E; Hwang K; Chang HN; Park HJ; Jeon DH; Cho HS; Chang SH; Park DJ
[Ad] Endereço:aDepartment of Internal Medicine, Changwon Gyeongsang National University Hospital, Changwon-si bDepartment of Internal Medicine, Gyeongsang National University Hospital cDepartment of Internal Medicine, College of Medicine, Gyeongsang National University dInstitute of Health Science, Gyeongsang National University, Jinju-si, Gyeongsangnam-do, South Korea.
[Ti] Título:Severe hypokalemic paralysis and rhabdomyolysis occurring after binge eating in a young bodybuilder: Case report.
[So] Source:Medicine (Baltimore);96(40):e8251, 2017 Oct.
[Is] ISSN:1536-5964
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:RATIONALE: Severe hypokalemia can be a potentially life-threatening disorder and is associated with variable degrees of skeletal muscle weakness. PATIENT CONCERNS: We report a case of severe hypokalemic paralysis and rhabdomyolysis in a 28-year-old bodybuilder. He was admitted to the emergency room due to progressive paralysis in both lower extremities, which had begun 12 hours earlier. He was a bodybuilder trainer and had participated in a regional competition 5 days earlier. He went on a binge, consuming large amounts of carbohydrates over 4 days, resulting in a gain of 10 kg in weight. DIAGNOSES: He had no family history of paralysis and this was his first attack. He strongly denied drug abuse, such as anabolic steroids, thyroid and growth hormone, and diuretics. Neurological examinations revealed symmetrical flaccid paralysis in his lower extremities, but the patient was alert and his sensory system was intact. His initial serum potassium and phosphate level was 1.8 mmol/L and 1.4 mg/dL, respectively. The calculated transtubular potassium gradient (TTKG) was 2.02. His thyroid function was normal. INTERVENTIONS AND OUTCOMES: Serum potassium levels increased to 3.8 mmol/L with intravenous infusion of about 50 mmol of potassium chloride over 20 hours. OUTCOMES: His muscular symptoms improved progressively and he was discharged from the hospital 7 days after admission on foot. He was followed in our outpatient clinic, without recurrence. LESSONS: Physicians should keep in mind that large intakes of food during short periods can provoke hypokalemic paralysis and rhabdomyolysis, especially in bodybuilders.
[Mh] Termos MeSH primário: Bulimia/complicações
Paralisia Periódica Hiperpotassêmica/etiologia
Rabdomiólise/etiologia
Levantamento de Peso
[Mh] Termos MeSH secundário: Adulto
Seres Humanos
Masculino
[Pt] Tipo de publicação:CASE REPORTS; JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171012
[Lr] Data última revisão:
171012
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171007
[St] Status:MEDLINE
[do] DOI:10.1097/MD.0000000000008251


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[PMID]:28841667
[Au] Autor:Melville GW; Siegler JC; Marshall PWM
[Ad] Endereço:School of Science and Health, Western Sydney University, Sydney, Australia.
[Ti] Título:The effects of d-aspartic acid supplementation in resistance-trained men over a three month training period: A randomised controlled trial.
[So] Source:PLoS One;12(8):e0182630, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:CONTEXT: Research on d-aspartic acid (DAA) has demonstrated increases in total testosterone levels in untrained men, however research in resistance-trained men demonstrated no changes, and reductions in testosterone levels. The long-term consequences of DAA in a resistance trained population are currently unknown. OBJECTIVE: To evaluate the effectiveness of DAA to alter basal testosterone levels over 3 months of resistance training in resistance-trained men. DESIGN: Randomised, double-blind, placebo controlled trial in healthy resistance-trained men, aged 18-36, had been performing regular resistance training exercise for at least 3 d.w-1 for the previous 2 years. Randomised participants were 22 men (d-aspartic acid n = 11; placebo n = 11) (age, 23.8±4.9 y, training age, 3.2±1.5 y). INTERVENTION: D-aspartic acid (6 g.d-1, DAA) versus equal-weight, visually-matched placebo (PLA). All participants performed 12 weeks of supervised, periodised resistance training (4 d.w-1), with a program focusing on all muscle groups. MEASURES: Basal hormones, total testosterone (TT), free testosterone (FT), estradiol (E2), sex-hormone-binding globulin (SHBG) and albumin (ALB); isometric strength; calf muscle cross-sectional area (CSA); calf muscle thickness; quadriceps muscle CSA; quadriceps muscle thickness; evoked V-wave and H-reflexes, were assessed at weeks zero (T1), after six weeks (T2) and after 12 weeks (T3). RESULTS: No change in basal TT or FT were observed after the intervention. DAA supplementation (n = 10) led to a 16%, 95% CI [-27%, -5%] reduction in E2 from T1-T3 (p<0.01). The placebo group (n = 9) demonstrated improvements in spinal responsiveness (gastrocnemius) at the level of the alpha motoneuron. Both groups exhibited increases in isometric strength of the plantar flexors by 17%, 95% CI [7%, 28%] (p<0.05) as well as similar increases in hypertrophy in the quadriceps and calf muscles. CONCLUSIONS: The results of this paper indicate that DAA supplementation is ineffective at changing testosterone levels, or positively affecting training outcomes. Reductions in estradiol and the blunting of peripheral excitability appear unrelated to improvements from resistance training. TRIAL REGISTRATION: Australian New Zealand Clinical Trials Registry ACTRN12617000041358.
[Mh] Termos MeSH primário: Ácido D-Aspártico/administração & dosagem
Suplementos Nutricionais
Levantamento de Peso
[Mh] Termos MeSH secundário: Adulto
Método Duplo-Cego
Eletromiografia
Seres Humanos
Masculino
Placebos
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Nm] Nome de substância:
0 (Placebos); 4SR0Q8YD1X (D-Aspartic Acid)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170826
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0182630


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[PMID]:28792857
[Au] Autor:Marriner CR; Cronin JB; Macadam P; Storey A
[Ad] Endereço:a Sports Performance Research Institute New Zealand (SPRINZ) at AUT Millennium , Auckland University of Technology , Auckland , New Zealand.
[Ti] Título:Redistributing load using wearable resistance during power clean training improves athletic performance.
[So] Source:Eur J Sport Sci;17(9):1101-1109, 2017 Oct.
[Is] ISSN:1536-7290
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A popular method to improve athletic performance and lower body power is to train with wearable resistance (WR), for example, weighted vests. However, it is currently unknown what training effect this loading method has on full-body explosive movements such as the power clean. The purpose of this study was to determine what effects WR equivalent to 12% body mass (BM) had on the power clean and countermovement jump (CMJ) performance. Sixteen male subjects (age: 23.2 ± 2.7 years; BM: 90.5 ± 10.3 kg) were randomly assigned to five weeks of traditional (TR) power clean training or training with 12% BM redistributed from the bar to the body using WR. Variables of interest included pre and post CMJ height, power clean one repetition maximum (1RM), peak ground reaction force, power output (PO), and several bar path kinematic variables across loads at 50%, 70%, and 90% of 1RM. The main findings were that WR training: (1) increased CMJ height (8.7%; ES = 0.53) and 1RM power clean (4.2%; ES = 0.2) as compared to the TR group (CMJ height = -1.4%; 1RM power clean = 1.8%); (2) increased PO across all 1RM loads (ES = 0.33-0.62); (3) increased barbell velocity at 90% 1RM (3.5%; ES = 0.74) as compared to the TR group (-4.3%); and (4) several bar path kinematic variables improved at 70% and 90% 1RM loads. WR power clean training with 12% BM can positively influence power clean ability and CMJ performance, as well as improve technique factors.
[Mh] Termos MeSH primário: Desempenho Atlético
Vestuário
Treinamento de Resistência/instrumentação
Levantamento de Peso/fisiologia
[Mh] Termos MeSH secundário: Adulto
Fenômenos Biomecânicos
Seres Humanos
Masculino
Força Muscular/fisiologia
Treinamento de Resistência/métodos
Suporte de Carga
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171002
[Lr] Data última revisão:
171002
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170810
[St] Status:MEDLINE
[do] DOI:10.1080/17461391.2017.1360396


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[PMID]:28753624
[Au] Autor:Maté-Muñoz JL; Lougedo JH; Barba M; García-Fernández P; Garnacho-Castaño MV; Domínguez R
[Ad] Endereço:Department of Physical Activity and Sport Sciences, Alfonso X el Sabio University, Madrid, Spain.
[Ti] Título:Muscular fatigue in response to different modalities of CrossFit sessions.
[So] Source:PLoS One;12(7):e0181855, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: CrossFit is a new strength and conditioning regimen involving short intense daily workouts called workouts of the day (WOD). This study assesses muscular fatigue levels induced by the three modalities of CrossFit WOD; gymnastics (G), metabolic conditioning (M) and weightlifting (W). MATERIAL AND METHODS: 34 healthy subjects undertook three WOD (one per week): a G WOD consisting of completing the highest number of sets of 5 pull-ups, 10 push-ups and 15 air squats in 20 min; an M WOD, in which the maximum number of double skipping rope jumps was executed in 8 sets (20 s), resting (10 s) between sets; and finally, a W WOD in which the maximum number of power cleans was executed in 5 min, lifting a load equivalent to 40% of the individual's 1RM. Before and after each WOD, blood lactate concentrations were measured. Also, before, during, and after each WOD, muscular fatigue was assessed in a countermovement jump test (CMJ). RESULTS: Significant reductions were produced in the mechanical variables jump height, average power and maximum velocity in response to G; and in jump height, mean and peak power, maximum velocity and maximum force in response to W (P<0.01). However, in M, significant reductions in mechanical variables were observed between pre- and mid session (after sets 2, 4, 6 and 8), but not between pre- and post session. CONCLUSIONS: Muscular fatigue, reflected by reduced CMJ variables, was produced following the G and W sessions, while recovery of this fatigue was observed at the end of M, likely attributable to rest intervals allowing for the recovery of phosphocreatine stores. Our findings also suggest that the high intensity and volume of exercise in G and W WODs could lead to reduced muscular-tendon stiffness causing a loss of jump ability, related here to a longer isometric phase during the CMJ.
[Mh] Termos MeSH primário: Fadiga Muscular/fisiologia
Treinamento de Resistência
[Mh] Termos MeSH secundário: Antropometria
Capilares/metabolismo
Ginástica
Seres Humanos
Lactatos/sangue
Locomoção
Masculino
Levantamento de Peso
Adulto Jovem
[Pt] Tipo de publicação:CLINICAL TRIAL; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lactates)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170929
[Lr] Data última revisão:
170929
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170729
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0181855



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