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https://www.readbyqxmd.com/read/28222393/caffeine-prevents-changes-in-muscle-caused-by-high-intensity-interval-training
#1
Juliano M Vieira, Jessié M Gutierres, Fabiano B Carvalho, Luciane B Pereira, Liziele S Oliveira, Vera Maria Morsch, Maria Rosa C Schetinger, Marília V Rodrigues, Jossiele Leitemperger, Vânia Loro, Cristina C Krewer, Marina S Vencato, Roselia M Spanevello
The use of ergogenic substances such as caffeine has become a strategy to enhance sports performance. In the present study we evaluated the effects of high-intensity interval training (HIIT) associated with caffeine intake on acetylcholinesterase (AChE) and Ca(2+)ATPase activity and glycogen levels in the muscles of rats were evaluated. The animals were divided in groups: control, caffeine 4 or 8mg/kg, HIIT, HIIT plus caffeine 4 or caffeine 8mg/kg. Our results showed a decrease in glycogen levels in muscle in all trained groups after acute session exercise, while that an increase in glycogen levels was observed in all groups in relation to control in chronic exercise protocol...
February 17, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28182503/do-glucose-and-caffeine-nasal-sprays-influence-exercise-and-or-cognitive-performance
#2
Kevin De Pauw, Bart Roelands, Jeroen Van Cutsem, Lieselot Decroix, Angelica Valente, Kim Taehee, Robert B LettanII, Andres E Carrillo, Romain Meeusen
INTRODUCTION/PURPOSE: Since nasal sprays (NAS) containing caffeine (CAF) or glucose (GLUC) activate sensory(motor) cortices, the aim of this study was to investigate the influence of CAF or GLUC-NAS on exercise and cognitive performance. METHODS: Eleven male subjects (Age: 22±2 yrs) performed a maximal cycle test, two familiarization and three experimental trials. Each trial included a 30 s Wingate test and a 30 min time-trial (TT) performance test interspersed by 15 min of rest...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28182502/effect-of-dietary-nitrate-supplementation-on-swimming-performance-in-trained-swimmers
#3
Sam Lowings, Oliver Michael Shannon, Kevin Deighton, Jamie Matu, Matthew John Barlow
Nitrate supplementation appears to be most ergogenic when oxygen availability is restricted and subsequently may be particularly beneficial for swimming performance due to the breath-hold element of this sport. This represents the first investigation of nitrate supplementation and swimming time-trial (TT) performance. In a randomised double-blind repeated-measures crossover study, ten (5male, 5female) trained swimmers ingested 140ml nitrate-rich (~12.5mmol nitrate) or nitrate-depleted (~0.01mmol nitrate) beetroot juice...
February 9, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28177747/short-term-heat-acclimation-improves-the-determinants-of-endurance-performance-and-5-000-m-running-performance-in-the-heat
#4
Carl Alexander James, Alan J Richardson, Peter W Watt, Ashley G B Willmott, Oliver R Gibson, Neil S Maxwell
This study investigated the effect of 5 days controlled hyperthermia heat acclimation (STHA) on the determinants of endurance performance and 5 km performance in runners, relative to the impairment afforded by moderate heat stress. A control group (CON), matched for total work and power output (2.7 W.kg-1), differentiated thermal and exercise contributions of STHA on exercise performance. Seventeen participants (10 STHA, 7 CON) completed graded exercise tests (GXT) in cool (13°C, 50% RH, pre training) and hot conditions (32°C, 60% RH, pre and post training), as well as 5 km time trials (TT) in the heat, pre and post training...
November 18, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28165424/changbai-mountain-ginseng-panax-ginseng-c-a-mey-extract-supplementation-improves-exercise-performance-and-energy-utilization-and-decreases-fatigue-associated-parameters-in-mice
#5
Guo-Dong Ma, Chun-Hui Chiu, Yi-Ju Hsu, Chien-Wen Hou, Yi-Ming Chen, Chi-Chang Huang
Changbai Mountain Ginseng (CMG, Panax ginseng C.A. Mey) is a traditional medicine commonly found in Northeast China and grows at elevations of 2000 m or higher in the Changbai Mountain Range. CMG, considered to be a "buried treasure medicine", is priced higher than other types of ginseng. However, few studies have demonstrated the effects of CMG supplementation on exercise performance, physical fatigue, and the biochemical profile. The major compound of CMG extract was characterized by electrospray ionization tandem mass spectrometry (HPLC-ESI-MS/MS)...
February 5, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28159654/physiological-basis-behind-ergogenic-effects-of-anabolic-androgens
#6
Ada S Cheung, Mathis Grossmann
Anabolic androgenic steroids (AAS) are widely abused by the sporting community. Demonstrating performance enhancing effects of AAS in rigorous scientific studies is fraught with difficulty. In controlled studies, AAS have consistently been reported to increase muscle mass and strength. The clinical evidence that these anabolic effects are independent of, and additive to exercise are supported by preclinical studies suggesting that AAS and exercise affect muscle by overlapping, yet distinct mechanisms. AAS may also improve performance by their actions on other organ systems, such as the vasculature, and the erythropoietic and central nervous system, although this evidence is less strong...
January 31, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28150477/red-ginseng-as-an-ergogenic-aid-a-systematic-review-of-clinical-trials
#7
REVIEW
Nan Hee Lee, Hyun Chul Jung, Sukho Lee
Purpose: This systematic review was performed to summarize clinical trials assessing the effect of Red Ginseng (RG) supplementation on exercise performance and fatigue recovery. Methods: Two English databases (PUBMED, MEDLINE) and two Korean databases (KISS, RISS) were used as systematic searching engines. We included only articles written in the English and Korean languages. Clinical trials, which evaluated exercise performance and recovery variables with RG supplementation, were included in this review...
31, 2016: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/28143855/-nutraceuticals-in-relation-to-human-skeletal-muscle-and-exercise
#8
Colleen Siobhan Deane, Daniel J Wilkinson, Bethan E Phillips, Kenneth Smith, Timothy Etheridge, Philip J Atherton
Skeletal muscles have a fundamental role in locomotion and whole body metabolism, with muscle mass and quality being linked to improved health and even lifespan. Optimising nutrition in combination with exercise is considered an established, effective ergogenic practice for athletic performance. Importantly, exercise and nutritional approaches also remain arguably the most effective countermeasure for muscle dysfunction associated with ageing and numerous clinical conditions e.g. cancer cachexia, COPD and organ failure, via engendering favourable adaptations such as increased muscle mass and oxidative capacity...
January 31, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28135216/effects-of-hyperventilation-on-repeated-pedaling-sprint-performance-short-vs-long-intervention-duration
#9
Akihiro Sakamoto, Hisashi Naito, Chin-Moi Chow
Previously, hyperventilation (HV) induced respiratory alkalosis, implemented during the last 30-s of each 60-s recovery that separated repeated pedaling sprints, has been shown to attenuate performance decrement. The present study investigated whether the ergogenic effects of HV would hold if the HV duration was shortened or extended. Seventeen power-trained athletes performed 10-s × 10 sets of standing pedaling sprints on a cycle ergometer, with 60-s inter-set recovery and the load (kp) set at 0.075 × body mass, under three breathing conditions: control, HV of 15-s (HVshort), and HV of 45-s (HVlong)...
January 20, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28134840/a2-milk-enhances-dynamic-muscle-function-following-repeated-sprint-exercise-a-possible-ergogenic-aid-for-a1-protein-intolerant-athletes
#10
Ben Kirk, Jade Mitchell, Matthew Jackson, Farzad Amirabdollahian, Omid Alizadehkhaiyat, Tom Clifford
Hyperaminoacidemia following ingestion of cows-milk may stimulate muscle anabolism and attenuate exercise-induced muscle damage (EIMD). However, as dairy-intolerant athletes do not obtain the reported benefits from milk-based products, A2 milk may offer a suitable alternative as it lacks the A1-protein. This study aimed to determine the effect of A2 milk on recovery from a sports-specific muscle damage model. Twenty-one male team sport players were allocated to three independent groups: A2 milk (n = 7), regular milk (n = 7), and placebo (PLA) (n = 7)...
January 28, 2017: Nutrients
https://www.readbyqxmd.com/read/28095077/running-performance-with-nutritive-and-non-nutritive-sweetened-mouth-rinses
#11
Keely H Hawkins, Sridevi Krishnan, Lara Ringos, Vanessa Garcia, Jamie A Cooper
: Mouth rinsing (MR) with carbohydrate during exercise has been shown to act as an ergogenic aid. PURPOSE: To investigate if nutritive or nonnutritive sweetened MR affect exercise performance, and to assess the influence of sweetness intensity on endurance performance during a time-trial (TT). METHODS: This randomized, single blinded study had 4 treatment conditions. 16 subjects (9 men, 7 women) completed a 12.8km TT four different times. During each TT, subjects MR and expectorated a different solution at time 0 and every 12...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28073123/effects-of-precooling-on-30-km-cycling-performance-and-pacing-in-hot-and-temperate-environments
#12
André Maia-Lima, Guilherme Passos Ramos, Michele Macedo Moraes, Diogo Antônio Soares Pacheco, Gustavo Guimarães Aguiar de Oliveira, Cristiano Lino Monteiro de Barros, Luciano Sales Prado, Emerson Silami Garcia
This study examined the effects of precooling on performance and pacing during 30-km cycling exercise in hot and temperate environments. 8 trained male cyclists performed 4 trials involving either cooling (PRECTEMP and PRECHOT) or no-cooling interventions (TEMP and HOT) prior to a 30-km self-paced cycling exercise in either a hot (35°C, 68% relative humidity) or temperate environment (24°C, 68% relative humidity). Exercise time was longer in HOT (60.62±3.47 min) than in TEMP (58.28±3.30 min; P<0...
January 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28067808/effects-of-beetroot-juice-supplementation-on-cardiorespiratory-endurance-in-athletes-a-systematic-review
#13
REVIEW
Raúl Domínguez, Eduardo Cuenca, José Luis Maté-Muñoz, Pablo García-Fernández, Noemí Serra-Paya, María Carmen Lozano Estevan, Pablo Veiga Herreros, Manuel Vicente Garnacho-Castaño
Athletes use nutritional supplementation to enhance the effects of training and achieve improvements in their athletic performance. Beetroot juice increases levels of nitric oxide (NO), which serves multiple functions related to increased blood flow, gas exchange, mitochondrial biogenesis and efficiency, and strengthening of muscle contraction. These biomarker improvements indicate that supplementation with beetroot juice could have ergogenic effects on cardiorespiratory endurance that would benefit athletic performance...
January 6, 2017: Nutrients
https://www.readbyqxmd.com/read/28050921/influence-of-dietary-acid-load-on-exercise-performance
#14
Catherine Applegate, Mackenzie Mueller, Krystle E Zuniga
Diet composition can affect systemic pH and acid-base regulation, which may in turn influence exercise performance. An acidic environment in the muscle impairs performance and contributes to fatigue; therefore, current trends in sports nutrition place importance on maximizing the alkalinity of the body with ergogenic aids and dietary strategies. This review examines the evidence on the effects of dietary manipulations on acid load and exercise performance. Ten studies that investigated the effect of high versus low dietary acid loads on athletic performance generally identified that low dietary acid loads increased plasma pH, but did not consistently improve exercise performance at maximal or submaximal exercise intensities...
January 4, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28019093/creatine-and-creatine-forms-intended-for-sports-nutrition
#15
REVIEW
Susanne Andres, Rainer Ziegenhagen, Iris Trefflich, Sophie Pevny, Katharina Schultrich, Hans Braun, Wilhelm Schänzer, Karen Ildico Hirsch-Ernst, Bernd Schäfer, Alfonso Lampen
Creatine is a popular ergogenic supplement in sports nutrition. Yet, supplementation of creatine occasionally caused adverse effects such as gastrointestinal complaints, muscle cramps and an increase in body weight. Creatine monohydrate has already been evaluated by different competent authorities and several have come to the conclusion that a daily intake of 3 g creatine per person is unlikely to pose safety concerns, focusing on healthy adults with exclusion of pregnant and breastfeeding women. Possible vulnerable subgroups were also discussed in relation to the safety of creatine...
December 25, 2016: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/27990227/effects-of-a-pre-workout-energy-drink-supplement-on-upper-body-muscular-endurance-performance
#16
Mitchel A Magrini, Ryan J Colquhoun, J Jay Dawes, Doug B Smith
The use of pre-workout beverages is becoming an increasingly common method of improving performance during exercise in athletic and recreationally active populations. Therefore, the purpose of this study was to investigate the effects of a commercially available energy drink on exercise performance. Thirty-one healthy males (n=23) and females (n=8) participated in this study and were separated into two groups: supplement (SU; n=16) or placebo (PL; n=15). Subjects visited the laboratory on 2 occasions separated by no more than 7 days...
2016: International Journal of Exercise Science
https://www.readbyqxmd.com/read/27938033/long-term-leucine-supplementation-improves-metabolic-but-not-molecular-responses-in-the-skeletal-muscle-of-trained-rats-submitted-to-exhaustive-exercise
#17
Gustavo Barbosa Dos Santos, André Gustavo de Oliveira, Maria Cristina Cintra Gomes Marcondes, Miguel Arcanjo Areas
AIM: Although there is some evidence of an ergogenic effect of leucine supplementation on acute response to exercise, there is a paucity of information on whether long-term leucine supplementation influences the adaptive response to chronic endurance training and performance. The main aim of our study was to assess the role of long-term leucine supplementation on molecular and metabolic response in skeletal muscle of trained rats after an exhaustion test. METHODS: Twenty-four male Wistar rats were randomly allocated into 4 groups...
February 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/27935992/intense-exercise-and-aerobic-conditioning-associated-with-chromium-or-l-carnitine-supplementation-modified-the-fecal-microbiota-of-fillies
#18
Maria Luiza Mendes de Almeida, Walter Heinz Feringer, Júlia Ribeiro Garcia Carvalho, Isadora Mestriner Rodrigues, Lilian Rezende Jordão, Mayara Gonçalves Fonseca, Adalgiza Souza Carneiro de Rezende, Antonio de Queiroz Neto, J Scott Weese, Márcio Carvalho da Costa, Eliana Gertrudes de Macedo Lemos, Guilherme de Camargo Ferraz
Recent studies performed in humans and rats have reported that exercise can alter the intestinal microbiota. Athletic horses perform intense exercise regularly, but studies characterizing horse microbiome during aerobic conditioning programs are still limited. Evidence has indicated that this microbial community is involved in the metabolic homeostasis of the host. Research on ergogenic substances using new sequencing technologies have been limited to the intestinal microbiota and there is a considerable demand for scientific studies that verify the effectiveness of these supplements in horses...
2016: PloS One
https://www.readbyqxmd.com/read/27934546/sodium-bicarbonate-ingestion-and-individual-variability-in-time-to-peak-ph
#19
Andy Sparks, Emily Williams, Amy Robinson, Peter Miller, David J Bentley, Craig Bridge, Lars R Mc Naughton
This study determined variability in time-to-peak pH after consumption of 300 mg kg(-)(1) of sodium bicarbonate. Seventeen participants (mean ± SD: age 21.38 ± 1.5 years; mass 75.8 ± 5.8 kg; height 176.8 ± 7.6 cm) reported to the laboratory where a resting capillary sample was taken. Then, 300 mg kg(-1) of NaHCO3 in 450 ml of flavoured water was ingested. Participants rested for 90 min and repeated blood samples were procured at 10 min intervals for 60 min and then every 5 min until 90 min...
January 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/27932993/effect-of-permissive-dehydration-on-induction-and-decay-of-heat-acclimation-and-temperate-exercise-performance
#20
Rebecca A Neal, Heather C Massey, Michael J Tipton, John S Young, Jo Corbett
Purpose: It has been suggested that dehydration is an independent stimulus for heat acclimation (HA), possibly through influencing fluid-regulation mechanisms and increasing plasma volume (PV) expansion. There is also some evidence that HA may be ergogenic in temperate conditions and that this may be linked to PV expansion. We investigated: (i) the influence of dehydration on the time-course of acquisition and decay of HA; (ii) whether dehydration augmented any ergogenic benefits in temperate conditions, particularly those related to PV expansion...
2016: Frontiers in Physiology
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