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https://www.readbyqxmd.com/read/28651256/the-cardiovascular-and-perceptual-response-to-very-low-load-blood-flow-restricted-exercise
#1
Matthew B Jessee, Scott J Dankel, Samuel L Buckner, J Grant Mouser, Kevin T Mattocks, Jeremy P Loenneke
This study sought to compare cardiovascular and perceptual responses to blood flow restriction (BFR) exercise using various pressure and load combinations. Fourteen participants completed four sets of BFR elbow flexion using 10, 15 and 20% 1RM with 40 and 80% arterial occlusion pressure (AOP). AOP was measured before and after exercise. Perceived exertion (RPE) and discomfort were assessed before exercise and after each set. Data presented as mean (95% CI), except for RPE and discomfort: 25(th), 50(th), 75(th) percentiles...
June 26, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28650277/attenuated-post-exercise-heart-rate-recovery-in-patients-with-systemic-lupus-erythematosus-the-role-of-disease-severity-and-beta-blocker-treatment
#2
P Bienias, M Ciurzyński, A Chrzanowska, I Dudzik-Niewiadomska, K Irzyk, K Oleszek, A Kalińska-Bienias, B Kisiel, W Tłustochowicz, P Pruszczyk
Objective Sinus tachycardia is frequently reported in systemic lupus erythematosus (SLE), while there are limited data on post-exercise ability to slow heart rate (i.e. heart rate recovery, HRR) in this group of patients. Methods We studied consecutive 70 patients with SLE and 30 healthy controls. All examined individuals underwent detailed clinical examination, echocardiography, Holter monitoring with heart rate variability and treadmill stress test using Bruce's protocol. HRR values were calculated as the difference between maximum HR during exercise and HR at the first (HRR1) and third (HRR3) minute of rest...
January 1, 2017: Lupus
https://www.readbyqxmd.com/read/28649714/exercise-during-short-term-exposure-to-hypoxia-or-hyperoxia-novel-treatment-strategies-for-type-2-diabetic-patients
#3
REVIEW
C Brinkmann, W Bloch, K Brixius
Both hypoxia (decreased oxygen availability) and hyperoxia (increased oxygen availability) have been shown to alter exercise adaptations in healthy subjects. This review aims to clarify the possible benefits of exercise during short-term exposure to hypoxia or hyperoxia for patients with type 2 diabetes mellitus (T2DM). There is evidence that exercise during short-term exposure to hypoxia can acutely increase skeletal muscle glucose uptake more than exercise in normoxia, and that post-exercise insulin sensitivity in T2DM patients is more increased when exercise is performed under hypoxic conditions...
June 26, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28648356/effects-of-high-intensity-interval-versus-continuous-exercise-training-on-post-exercise-heart-rate-recovery-in-coronary-heart-disease-patients
#4
Koldobika Villelabeitia-Jaureguizar, Davinia Vicente-Campos, Alejandro Berenguel Senen, Verónica Hernández Jiménez, María Elvira Barrios Garrido-Lestache, Jose López Chicharro
BACKGROUND: Heart rate recovery (HRR) has been considered a prognostic and mortality indicator in both healthy and coronary patients. Physical exercise prescription has shown improvements in VO2peak and HRR, but most of the studies have been carried out applying continuous training at a moderate intensity, being very limited the use of protocols of high intensity interval training in coronary patients. We aimed to compare the effects of a moderate continuous training (MCT) versus a high intensity interval training (HIIT) programme on VO2peak and HRR...
June 17, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28643221/post-exercise-blood-flow-restriction-attenuates-hyperemia-similarly-in-males-and-females
#5
Scott J Dankel, J Grant Mouser, Matthew B Jessee, Kevin T Mattocks, Samuel L Buckner, Jeremy P Loenneke
PURPOSE: Our laboratory recently demonstrated that post-exercise blood flow restriction attenuated muscle hypertrophy only in females, which we hypothesized may be due to alterations in post-exercise blood flow. The aim of this study is to test our previous hypothesis that sex differences in blood flow would exist when employing the same protocol. METHODS: Twenty-two untrained individuals (12 females; 10 males) performed two exercise sessions, each involving one set of elbow flexion exercise to volitional failure on the right arm...
June 22, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28642676/international-society-of-sports-nutrition-position-stand-protein-and-exercise
#6
REVIEW
Ralf Jäger, Chad M Kerksick, Bill I Campbell, Paul J Cribb, Shawn D Wells, Tim M Skwiat, Martin Purpura, Tim N Ziegenfuss, Arny A Ferrando, Shawn M Arent, Abbie E Smith-Ryan, Jeffrey R Stout, Paul J Arciero, Michael J Ormsbee, Lem W Taylor, Colin D Wilborn, Doug S Kalman, Richard B Kreider, Darryn S Willoughby, Jay R Hoffman, Jamie L Krzykowski, Jose Antonio
The International Society of Sports Nutrition (ISSN) provides an objective and critical review related to the intake of protein for healthy, exercising individuals. Based on the current available literature, the position of the Society is as follows:An acute exercise stimulus, particularly resistance exercise, and protein ingestion both stimulate muscle protein synthesis (MPS) and are synergistic when protein consumption occurs before or after resistance exercise.For building muscle mass and for maintaining muscle mass through a positive muscle protein balance, an overall daily protein intake in the range of 1...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28638919/-analyses-of-exercise-induced-muscle-damage-specific-microrna-expression-and-molecular-target-of-sarcolemmal-damage-in-rats
#7
Yu-Ming Xu, Jian-Min Cao, Jun-Ping Li, Qiao-Ting Huang, Ping Wang
In the present study, we were to screen the specific microRNA (miRNA) of exercise-induced muscle damage (EIMD) and assess the EIMD-specific miRNAs-regulated target of sarcolemmal damage in rats. Twenty-four male Sprague-Dawley (SD) rats were randomly divided into 3 groups, which included sedentary (C), 24 h post-exercise (E24) and 48 h post-exercise (E48) groups. Rat EIMD model was established by an acute eccentric exercise, i.e., a downhill running treatment at -16º gradient. EIMD characteristics were verified by Evans blue dye staining, differentially expressed miRNAs were detected by microarray assay, EIMD-specific miRNAs expressions were further validated by real-time quantitative RT-PCR (RT-qPCR), and targets of the miRNAs were predicted based on mRNA expressions of associated proteins and related pathway core molecules of sarcolemmal damage...
June 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/28638350/branched-chain-amino-acid-ingestion-stimulates-muscle-myofibrillar-protein-synthesis-following-resistance-exercise-in-humans
#8
Sarah R Jackman, Oliver C Witard, Andrew Philp, Gareth A Wallis, Keith Baar, Kevin D Tipton
The ingestion of intact protein or essential amino acids (EAA) stimulates mechanistic target of rapamycin complex-1 (mTORC1) signaling and muscle protein synthesis (MPS) following resistance exercise. The purpose of this study was to investigate the response of myofibrillar-MPS to ingestion of branched-chain amino acids (BCAAs) only (i.e., without concurrent ingestion of other EAA, intact protein, or other macronutrients) following resistance exercise in humans. Ten young (20.1 ± 1.3 years), resistance-trained men completed two trials, ingesting either 5...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28630704/the-effects-of-a-post-exercise-carbohydrate-and-protein-supplement-on-repeat-performance-serum-chemistry-insulin-and-glucagon-in-competitive-weight-pulling-dogs
#9
Christopher W Frye, Gretchen M VanDeventer, Gina K Dinallo, Jennifer A Poplarski, Sabine Mann, Ella Pittman, Brian M Zanghi, Joseph J Wakshlag
The physiological demands of weight-pulling dogs have yet to be investigated. Two groups of competitive weight-pulling dogs both underwent two identical pull series 3 h apart. The control group (n 8) was compared with a group fed a rapidly digestible carbohydrate and protein supplement after the first pull series (n 9). Blood was drawn before and after each pull series as well as at 15 and 30 min after the first pull series finished. Biochemistry values remained unremarkable throughout the study in both groups regardless of supplementation or exercise over time...
2017: Journal of Nutritional Science
https://www.readbyqxmd.com/read/28630581/5000-meter-run-performance-is-not-enhanced-24-hrs-after-an-intense-exercise-bout-and-cold-water-immersion
#10
Mary C Stenson, Matthew R Stenson, Tracey D Matthews, Vincent J Paolone
Cold water immersion (CWI) is used by endurance athletes to speed recovery between exercise bouts, but little evidence is available on the effects of CWI on subsequent endurance performance. The purpose of this study was to investigate the effects of CWI following an acute bout of interval training on 5000 m run performance 24 hrs after interval training, perceived muscle soreness (PMS), range of motion (ROM), thigh circumference (TC), and perceived exertion (RPE). Nine endurance-trained males completed 2 trials, each consisting of an interval training session of 8 repetitions of 1200 m at a running pace equal to 75% of VO2peak, either a control or CWI treatment, and a timed 5000 m run 24 hrs post interval training session...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28630576/no-effect-of-a-whey-growth-factor-extract-during-resistance-training-on-strength-body-composition-or-hypertrophic-gene-expression-in-resistance-trained-young-men
#11
Michael J Dale, Alison M Coates, Peter R C Howe, Grant R Tomkinson, Matthew T Haren, Andrew Brown, Marissa Caldow, David Cameron-Smith, Jonathan D Buckley
Growth factors can be isolated from bovine milk to form a whey growth factor extract (WGFE). This study examined whether WGFE promoted activation of the AKT/mTOR pathway enabling increased lean tissue mass and strength in resistance trained men. Forty six men with >6 months of resistance training (RT) experience performed 12 weeks of RT. Participants consumed 20 g/day of whey protein and were randomised to receive either 1.6 g WGFE/day (WGFE; n = 22) or 1.6 g cellulose/day (control, CONT; n = 24). The primary outcome was leg press one-repetition maximum (LP1-RM) which was assessed at baseline, 6 and 12 weeks...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28630575/acute-and-post-exercise-physiological-responses-to-high-intensity-interval-training-in-endurance-and-sprint-athletes
#12
Lukas Cipryan, Gerhard Tschakert, Peter Hofmann
The purpose of the presented study was to compare acute and post-exercise differences in cardiorespiratory, metabolic, cardiac autonomic, inflammatory and muscle damage responses to high-intensity interval exercise (HIIT) between endurance and sprint athletes. The study group consisted of sixteen highly-trained males (age 22.1 ± 2.5 years) participating in endurance (n = 8) or sprint (n = 8) sporting events. All the participants underwent three exercise sessions: short HIIT (work interval duration 30s), long HIIT (3min) and constant load exercise (CE)...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28626082/significant-role-of-the-cardio-postural-interaction-in-blood-pressure-regulation-during-standing
#13
Da Xu, Ajay Verma, Amanmeet Garg, Michelle Bruner, Reza Fazel-Rezai, Andrew P Blaber, Kouhyar Tavakolian
Cardiovascular and postural control systems have been studied independently despite the increasing evidence showing the importance of cardio-postural interaction in blood pressure regulation. In this study, we aimed to assess the role of cardio-postural interaction in relation to cardiac baroreflex in blood pressure regulation under orthostatic stress before and after mild exercise. Physiological variables representing cardiovascular control (heart rate and systolic blood pressure), lower limb muscle activation (electromyography), and postural sway (center of pressure derived from force and moment data during sway) were measured from 17 healthy participants (25±2 years; 8 females) during a sit-to-stand test before and after sub-maximal exercise...
June 16, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28615996/international-society-of-sports-nutrition-position-stand-safety-and-efficacy-of-creatine-supplementation-in-exercise-sport-and-medicine
#14
REVIEW
Richard B Kreider, Douglas S Kalman, Jose Antonio, Tim N Ziegenfuss, Robert Wildman, Rick Collins, Darren G Candow, Susan M Kleiner, Anthony L Almada, Hector L Lopez
Creatine is one of the most popular nutritional ergogenic aids for athletes. Studies have consistently shown that creatine supplementation increases intramuscular creatine concentrations which may help explain the observed improvements in high intensity exercise performance leading to greater training adaptations. In addition to athletic and exercise improvement, research has shown that creatine supplementation may enhance post-exercise recovery, injury prevention, thermoregulation, rehabilitation, and concussion and/or spinal cord neuroprotection...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28615090/prior-exercise-alters-the-difference-between-arterialised-and-venous-glycaemia-implications-for-blood-sampling-procedures
#15
Robert M Edinburgh, Aaron Hengist, Harry A Smith, James A Betts, Dylan Thompson, Jean-Philippe Walhin, Javier T Gonzalez
Oral glucose tolerance and insulin sensitivity are common measures, but are determined using various blood sampling methods, employed under many different experimental conditions. This study established whether measures of oral glucose tolerance and oral glucose-derived insulin sensitivity (insulin sensitivity indices; ISI) differ when calculated from venous v. arterialised blood. Critically, we also established whether any differences between sampling methods are consistent across distinct metabolic conditions (after rest v...
June 15, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28614163/effect-of-low-volume-high-intensity-interval-exercise-and-continuous-exercise-on-delayed-onset-muscle-soreness-in-untrained-healthy-males
#16
Luiz F Farias Junior, Rodrigo A V Browne, Danniel T Frazão, Teresa C B Dantas, Paulo H M Silva, Rodrigo P A Freitas, Marcelo S Aoki, Eduardo C Costa
The aim of this study was to compare the effect of a single session of a low-volume high-intensity interval exercise (HIIE) and a continuous exercise (CE) on the magnitude of delayed onset-muscle soreness (DOMS) in untrained healthy males. Fifteen participants (25.1±4.4 years) completed 2 experimental sessions in a randomized order: (a) low-volume HIIE: 10 x 60 s at 90% of maximal velocity (MV) interspersed with 60s of active recovery at 30% of MV; and (b) CE: 20 min at 60% of MV. Pressure-pain threshold (PPT), pressure-pain tolerance (PPTol) and perceived pain intensity (PPI) were assessed in the rectus femoris, biceps femoris and gastrocnemius before and 24 hours post-exercise...
June 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28611681/dose-response-of-high-intensity-training-hit-on-atheroprotective-mirna-126-levels
#17
Boris Schmitz, Katrin Schelleckes, Johanna Nedele, Lothar Thorwesten, Andreas Klose, Malte Lenders, Michael Krüger, Eva Brand, Stefan-Martin Brand
Aim: MicroRNA-126 (miR-126) exerts beneficial effects on vascular integrity, angiogenesis, and atherosclerotic plaque stability. The purpose of this investigation was to analyze the dose-response relationship of high-intensity interval training (HIIT) on miR-126-3p and -5p levels. Methods: Sixty-one moderately trained individuals (females = 31 [50.8%]; 22.0 ± 1.84 years) were consecutively recruited and allocated into three matched groups using exercise capacity. During a 4-week intervention a HIIT group performed three exercise sessions/week of 4 × 30 s at maximum speed (all-out), a progressive HIIT (proHIIT) group performed three exercise sessions/week of 4 × 30 s at maximum speed (all-out) with one extra session every week (up to 7 × 30 s) and a low-intensity training (LIT) control group performed three exercise sessions/week for 25 min <75% of maximum heart rate...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28611675/cardiac-autonomic-responses-during-exercise-and-post-exercise-recovery-using-heart-rate-variability-and-systolic-time-intervals-a-review
#18
REVIEW
Scott Michael, Kenneth S Graham, Glen M Davis
Cardiac parasympathetic activity may be non-invasively investigated using heart rate variability (HRV), although HRV is not widely accepted to reflect sympathetic activity. Instead, cardiac sympathetic activity may be investigated using systolic time intervals (STI), such as the pre-ejection period. Although these autonomic indices are typically measured during rest, the "reactivity hypothesis" suggests that investigating responses to a stressor (e.g., exercise) may be a valuable monitoring approach in clinical and high-performance settings...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28605609/effects-of-macro-and-micro-nutrients-on-exercise-induced-hepcidin-response-in-highly-trained-endurance-athletes
#19
Dylan Timothy Dahlquist, Trent Stellingwerff, Brad Pendleton Dieter, Donald C McKenzie, Michael S Koehle
Iron deficiency (ID) has ergolytic effects on athletic performance. Exercise induced inflammation impedes iron absorption in the digestive tract by up-regulating the expression of the iron regulatory protein, hepcidin. Limited research indicates the potential of specific macro- and micro- nutrients on blunting exercise induced hepcidin. Therefore, we investigated the effects of post-exercise supplementation with protein and carbohydrate (CHO) and vitamins D3 and K2 on the post-exercise hepcidin response. Ten highly-trained male cyclists (age: 26...
June 12, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28603468/minimal-dose-of-milk-protein-concentrate-to-enhance-the-anabolic-signalling-response-to-a-single-bout-of-resistance-exercise-a-randomised-controlled-trial
#20
Cameron J Mitchell, Nina Zeng, Randall F D'Souza, Sarah M Mitchell, Kirsten Aasen, Aaron C Fanning, Sally D Poppitt, David Cameron-Smith
BACKGROUND: Resistance training is a potent stimulus to induce muscle hypertrophy. Supplemental protein intake is known to enhance gains in muscle mass through activation of the mammalian target of rapamycin complex 1 (mTORC1) pathway, which initiates protein translation. While the optimal dose of high quality protein to promote post exercise anabolism in young or older men has been investigated, little is known about the minimum doses of protein required to potentiate the resistance exercise activation of anabolic signalling in middle aged men...
2017: Journal of the International Society of Sports Nutrition
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