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https://www.readbyqxmd.com/read/29345173/effects-of-3-day-serial-sodium-bicarbonate-loading-on-performance-and-physiological-parameters-during-a-simulated-basketball-test-in-female-university-players
#1
Anne Delextrat, Sinead MacKessy, Luis Arceo-Rendon, Aaron Scanlan, Roger Ramsbottom, Julio Calleja-González
The aim of this study was to investigate the effect of 3-day serial sodium bicarbonate ingestion on repeated sprint and jump performance. Fifteen female university basketball players (23.3±3.4 years; 173.1±5.8 cm; 65.8±6.3 kg; 23.6±4.9% body fat) ingested 0.4 g·kg-1 of body mass of sodium bicarbonate or placebo for 3 days (split in 3 equal daily doses), before completing a simulated basketball exercise. Sprint and circuit times, jump heights, performance decrements and gastrointestinal (GI) side effects were recorded during the test and blood lactate concentration was measured pre- and post-test...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29345161/caffeine-improves-triathlon-performance-a-field-study-in-males-and-females
#2
Sunita Potgieter, Hattie H Wright, Carine Smith
The ergogenic effect of caffeine on endurance exercise is commonly accepted. We aimed to elucidate realistically the effect of caffeine on triathlon event performance using a field study design, while allowing investigation into potential mechanisms at play. A double-blind, randomized, crossover, field trial was conducted. Twenty-six triathletes (14 males, 12 females) participated (age: 37.8±10.6 years, habitual caffeine intake: 413±505 mg/day, percentage body fat: 14.5±7.2%, training/week: 12.8±4.5 hours)...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29344729/sodium-bicarbonate-supplementation-improves-severe-intensity-intermittent-exercise-under-moderate-acute-hypoxic-conditions
#3
Sanjoy K Deb, Lewis A Gough, S Andy Sparks, Lars R McNaughton
Acute moderate hypoxic exposure can substantially impair exercise performance, which occurs with a concurrent exacerbated rise in hydrogen cation (H+) production. The purpose of this study was therefore, to alleviate this acidic stress through sodium bicarbonate (NaHCO3) supplementation and determine the corresponding effects on severe-intensity intermittent exercise performance. Eleven recreationally active individuals participated in this randomised, double-blind, crossover study performed under acute normobaric hypoxic conditions (FiO2% = 14...
January 17, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29343183/the-acute-angiogenic-signalling-response-to-low-load-resistance-exercise-with-blood-flow-restriction
#4
Richard A Ferguson, Julie E A Hunt, Mark P Lewis, Neil R W Martin, Darren J Player, Carolin Stangier, Conor W Taylor, Mark C Turner
This study investigated protein kinase activation and gene expression of angiogenic factors in response to low-load resistance exercise with or without blood flow restriction (BFR). In a repeated measures cross-over design, six males performed four sets of bilateral knee extension exercise at 20% 1RM (reps per set = 30:15:15:continued to fatigue) with BFR (110 mmHg) and without (CON). Muscle biopsies were obtained from the vastus lateralis before, 2 and 4 h post-exercise. mRNA expression was determined using real-time RT-PCR...
January 17, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29340006/the-impact-of-the-progressive-efficiency-test-on-a-rowing-ergometer-on-white-blood-cells-distribution-and-clinical-chemistry-changes-in-paralympic-rowers-during-the-preparatory-stage-before-the-paralympic-games-in-rio-2016-a-case-report
#5
Robert Nowak, Rafał Buryta, Krzysztof Krupecki, Tomasz Zając, Marek Zawartka, Patrizia Proia, Dorota Kostrzewa-Nowak
There is a large gap in knowledge regarding research on post-exercise blood changes in disabled athletes. There are relatively few data on adaptive mechanisms to exercise in disabled athletes, including disabled rowers. Two rowers from a Polish adaptive rowing settle TAMix2x that qualified for the Paralympic Games in Rio, 2016 took part in this study. They performed a progressive test on a rowing ergometer until exhaustion. The cardiorespiratory fitness measures, complete blood count, white blood cells' distribution and 30 clinical chemistry variables describing laboratory diagnostic profiles and general health were determined...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29338917/exercise-training-in-adults-with-repaired-tetralogy-of-fallot-a-randomized-controlled-pilot-study-of-continuous-versus-interval-training
#6
Marko Novaković, Katja Prokšelj, Uroš Rajkovič, Tjaša Vižintin Cuderman, Katja Janša Trontelj, Zlatko Fras, Borut Jug
INTRODUCTION: Adults with repaired tetralogy of Fallot (ToF) have impaired exercise capacity, vascular and cardiac autonomic function, and quality of life (QoL). Specific effects of high-intensity interval or moderate continuous exercise training on these parameters in adults with repaired ToF remain unknown. METHODS AND RESULTS: Thirty adults with repaired ToF were randomized to either high-intensity interval, moderate intensity continuous training (36 sessions, 2-3 times a week) or usual care (no supervised exercise)...
January 3, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29337384/dual-hormone-artificial-pancreas-benefits-and-limitations-compared-with-single-hormone-systems
#7
Tricia M Peters, Ahmad Haidar
Technological advances have made the artificial pancreas a reality. This has the potential to improve the lives of individuals with Type 1 diabetes by reducing the risk of hypoglycaemia, achieving better overall glucose control, and enhancing quality of life. Both single-hormone (insulin-only) and dual-hormone (insulin and glucagon) systems have been developed; however, a focused review of the relative benefits of each artificial pancreas system is needed. We reviewed studies that directly compared single- and dual-hormone systems to evaluate the efficacy of each system for preventing hypoglycaemia and maintaining glycaemic control, as well as their utility in specific situations including during exercise, overnight and during the prandial period...
January 16, 2018: Diabetic Medicine: a Journal of the British Diabetic Association
https://www.readbyqxmd.com/read/29330356/metabolic-and-molecular-changes-associated-with-the-increased-skeletal-muscle-insulin-action-24-48%C3%A2-h-after-exercise-in-young-and-old-humans
#8
REVIEW
Francis B Stephens, Kostas Tsintzas
The molecular and metabolic mechanisms underlying the increase in insulin sensitivity (i.e. increased insulin-stimulated skeletal muscle glucose uptake, phosphorylation and storage as glycogen) observed from 12 to 48 h following a single bout of exercise in humans remain unresolved. Moreover, whether these mechanisms differ with age is unclear. It is well established that a single bout of exercise increases the translocation of the glucose transporter, GLUT4, to the plasma membrane. Previous research using unilateral limb muscle contraction models in combination with hyperinsulinaemia has demonstrated that the increase in insulin sensitivity and glycogen synthesis 24 h after exercise is also associated with an increase in hexokinase II (HKII) mRNA and protein content, suggesting an increase in the capacity of the muscle to phosphorylate glucose and divert it towards glycogen synthesis...
January 12, 2018: Biochemical Society Transactions
https://www.readbyqxmd.com/read/29329910/the-effects-of-exercise-intensity-and-post-exercise-recovery-time-on-cortical-activation-as-revealed-by-eeg-alpha-peak-frequency
#9
B Gutmann, P Zimmer, T Hülsdünker, J Lefebvre, S Binnebößel, M Oberste, W Bloch, H K Strüder, A Mierau
Acute physical exercise (APE) induces an increase in the individual alpha peak frequency (iAPF), a cortical parameter associated with neural information processing speed. The aim of this study was to further scrutinize the influence of different APE intensities on post-exercise iAPF as well as its time course after exercise cessation. 95 healthy young (18-35 years) subjects participated in two randomized controlled experiments (EX1 and EX2). In EX1, all participants completed a graded exercise test (GXT) until exhaustion and were randomly allocated into different delay groups (immediately 0, 30, 60 and 90 minutes after GXT)...
January 9, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29325455/influence-of-middle-distance-running-on-muscular-micro-rnas
#10
Elisa Danese, Marco Benati, Fabian Sanchis-Gomar, Cantor Tarperi, Gian Luca Salvagno, Elisa Paviati, Martina Montagnana, Federico Schena, Giuseppe Lippi
A specific subset of micro RNAs (miRs), including miR-133 and miR-206, is specifically expressed in muscle tissue, so that they are currently defined as muscular miRs (myomiRs). To further elucidate the role of myomiRs in muscle biology, we measured miR-133a and miR-206 in plasma of 28 middle-age recreational athletes. The study population consisted of 28 middle aged, recreation athletes (11 women and 17 men; mean age, 46 years) who completed a 21.1 km, half-marathon. The plasma concentration of miR-133a and miR-206, the serum concentration of creatine kinase (CK) and high-sensitivity (HS) cardiac troponin T (cTnT), as well as capillary lactate, were measured before and immediately after the run...
January 11, 2018: Scandinavian Journal of Clinical and Laboratory Investigation
https://www.readbyqxmd.com/read/29324825/early-and-later-phases-satellite-cell-responses-and-myonuclear-content-with-resistance-training-in-young-men
#11
Felipe Damas, Cleiton A Libardi, Carlos Ugrinowitsch, Felipe C Vechin, Manoel E Lixandrão, Tim Snijders, Joshua P Nederveen, Aline V Bacurau, Patricia Brum, Valmor Tricoli, Hamilton Roschel, Gianni Parise, Stuart M Phillips
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...
2018: PloS One
https://www.readbyqxmd.com/read/29322520/muscle-cooling-too-much-of-a-good-thing
#12
C Mawhinney, R Allan
It is well documented that strenuous exercise elicits stress on the body, which may lead to physiological impairments and associated reductions in muscle function and fatigue, in the hours and days post-exercise. This article is protected by copyright. All rights reserved.
January 11, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29320878/exercise-training-for-improving-outcomes-post-burns-a-systematic-review-and-meta-analysis
#13
Orlando Flores, Zephanie Tyack, Kellie Stockton, Robert Ware, Jennifer D Paratz
OBJECTIVES: To determine the effectiveness of different modalities of exercise and to evaluate the safety of exercise-based interventions post-burns. DATA SOURCES: Six databases were searched from inception to October 2017 using "burn," "exercise" and synonyms as keywords. Relevant authors, key journals and reference lists of included studies were hand-searched. REVIEW METHODS: Articles reporting on exercise interventions in patients post-burn and considering physical, physiological or psychological outcomes were considered...
January 1, 2018: Clinical Rehabilitation
https://www.readbyqxmd.com/read/29320303/time-of-day-and-short-duration-high-intensity-exercise-influences-on-coagulation-and-fibrinolysis
#14
Emma Kate Zadow, Cecilia Marie Kitic, Sam Shi Xuan Wu, James William Fell, Murray John Adams
Exercise has been demonstrated to have considerable effects upon haemostasis, with activation dependent upon the duration and intensity of the exercise bout. In addition, markers of coagulation and fibrinolysis have been shown to possess circadian rhythms, peaking within the morning (0600-1200 h). Therefore, the time of day in which exercise is performed may influence the activation of the coagulation and fibrinolytic systems. This study aimed to examine coagulation and fibrinolytic responses to short-duration high-intensity exercise when completed at different times of the day...
January 10, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29319761/isotonic-sports-drink-promotes-rehydration-and-decreases-proteinuria-following-karate-training
#15
Simone Geraldini, Igor de Freitas Cruz, Alexandre Romero, Fernando Luiz Affonso Fonseca, Michelle Parreira de Campos
INTRODUCTION: Adequate hydration status in the sport is essential for good health, yet the relationship between hydration, proteinuria and sports is little studied. OBJECTIVE: To analyze the influence of an isotonic sports drink as rehydration strategy on the hydration status and proteinuria after karate training. METHODS: Ten athletes participated in this study. In the first session of standard training, called observation training session (STO), the athletes hydrated themselves according to their habits, and in the second session of standard training, called nutritional intervention training session (STIN), an ideal practice of hydration protocol was followed, using an isotonic sports drink as a rehydration liquid during the training...
October 2017: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
https://www.readbyqxmd.com/read/29315892/effects-of-fasted-vs-fed-state-exercise-on-performance-and-post-exercise-metabolism-a-systematic-review-meta-analysis
#16
REVIEW
Tom P Aird, Robert W Davies, Brian P Carson
The effects of nutrition on exercise metabolism and performance remains an important topic among sports scientists, clinical, and athletic populations. Recently, fasted exercise has garnered interest as a beneficial stimulus which induces superior metabolic adaptations to fed exercise in key peripheral tissues. Conversely, pre-exercise feeding augments exercise performance compared with fasting conditions. Given these seemingly divergent effects on performance and metabolism, an appraisal of the literature is warranted...
January 6, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29315576/the-metaboreflex-does-not-contribute-to-the-increase-in-muscle-sympathetic-nerve-activity-to-contracting-muscle-during-static-exercise-in-humans
#17
Daniel Boulton, Chloe E Taylor, Simon Green, Vaughan G Macefield
Both central command and metaboreflex inputs from contracting muscles increase muscle sympathetic nerve activity (MSNA) to non-contracting muscle during sustained isometric exercise. We recently showed that MSNA to contracting muscle also increases in an intensity-dependent manner, but whether this can be sustained by the metaboreflex is unknown. MSNA was recorded from the left common peroneal nerve and spikes of MSNA extracted. Eleven subjects performed a series of four-minute dorsiflexions of the left ankle at 10% of maximum voluntary contraction under three conditions: without ischaemia, with 6 min of post-exercise ischaemia and with ischaemia during and after exercise; these were repeated in the right leg...
January 8, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29315567/the-influence-of-capillarization-on-satellite-cell-pool-expansion-and-activation-following-exercise-induced-muscle-damage-in-healthy-young-men
#18
Joshua P Nederveen, Sophie Joanisse, Tim Snijders, Aaron Cq Thomas, Dinesh Kumbhare, Gianni Parise
Factors that determine the skeletal muscle satellite cell (SC) response remain incompletely understood. It is known, however, that SC activation status is closely related to the anatomical relationship between SC and muscle capillaries. We investigated the impact of muscle fibre capillarization on the expansion and activation status of SC following a muscle damaging exercise protocol in healthy young men. Twenty-nine young men (21 ± 0.5 yrs) performed 300 unilateral eccentric contractions (180 deg·s-1 ) of the knee extensors...
January 6, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29306453/a-caffeine-containing-weight-loss-supplement-augments-hemodynamic-responses-after-exercise
#19
S R Buchanan, M Karabulut
BACKGROUND: Since the effects of supplements can be potentially harmful and/or ineffective to obtain desired positive benefits, there is a need to investigate supplementation to understand the responses of physiological systems, to educate consumers, and to provide feedback for businesses creating these supplements. The purpose of the current study was to test hemodynamic responses of a weight loss supplement and determine its effects on hemodynamic variables. METHODS: 31 participants underwent a randomized, double-blind, crossover study design and received a placebo or supplement on two separate days...
February 15, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29303601/the-effect-of-adrenalectomy-on-exercise-response-of-the-renin-angiotensin-aldosterone-system-and-exercise-tolerance-in-primary-aldosteronism
#20
V Tuka, M Matoulek, J Rosa, O Petrák, O Mikeš, Z Krátká, B Štrauch, R Holaj, T Zelinka, J Widimský
Primary aldosteronism (PA) is associated with objectively measured lower physical fitness and blunted response of the renin-angiotensin-aldosterone system to exercise. The purpose of this pilot study was to objectively measure exercise response of the renin-angiotensin-aldosterone system and cardiopulmonary fitness changes after laparoscopic adrenalectomy (ADE) in patients with unilateral PA. We examined a total of 14 patients with confirmed PA before and after ADE, by means of spiroergometry and hormonal evaluation...
January 5, 2018: Physiological Research
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