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https://www.readbyqxmd.com/read/28713464/a-rapidly-incremented-tethered-swimming-test-for-defining-domain-specific-training-zones
#1
Dalton M Pessôa Filho, Leandro O C Siqueira, Astor R Simionato, Mário A C Espada, Daniel S Pestana, Fred J DiMenna
The purpose of this study was to investigate whether a tethered-swimming incremental test comprising small increases in resistive force applied every 60 seconds could delineate the isocapnic region during rapidly-incremented exercise. Sixteen competitive swimmers (male, n = 11; female, n = 5) performed: (a) a test to determine highest force during 30 seconds of all-out tethered swimming (Favg) and the ΔF, which represented the difference between Favg and the force required to maintain body alignment (Fbase), and (b) an incremental test beginning with 60 seconds of tethered swimming against a load that exceeded Fbase by 30% of ΔF followed by increments of 5% of ΔF every 60 seconds...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28708126/the-effect-of-a-12-week-beta-hydroxy-beta-methylbutyrate-hmb-supplementation-on-highly-trained-combat-sports-athletes-a-randomised-double-blind-placebo-controlled-crossover-study
#2
Krzysztof Durkalec-Michalski, Jan Jeszka, Tomasz Podgórski
The aim of this study was to verify the effect of beta-hydroxy-beta-methylbutyrate (HMB) supplementation on physical capacity, body composition and the value of biochemical parameters in highly-trained combat sports athletes. Forty-two males highly-trained in combat sports were subjected to 12 weeks of supplementation with HMB and a placebo in a randomized, placebo controlled, double-blind crossover manner. Over the course of the experiment, aerobic and anaerobic capacity was determined, while analyses were conducted on body composition and levels of creatine kinase, lactate dehydrogenase, testosterone, cortisol and lactate...
July 14, 2017: Nutrients
https://www.readbyqxmd.com/read/28706467/ketogenic-diet-benefits-body-composition-and-well-being-but-not-performance-in-a-pilot-case-study-of-new-zealand-endurance-athletes
#3
Caryn Zinn, Matthew Wood, Mikki Williden, Simon Chatterton, Ed Maunder
BACKGROUND: Low-carbohydrate, high-fat and ketogenic diets are increasingly adopted by athletes for body composition and sports performance enhancements. However, as yet, there is no consensus on their efficacy in improving performance. There is also no comprehensive literature on athletes' experiences while undertaking this diet. The purpose of this pilot work was two-fold: i. to examine the effects of a non-calorie controlled ketogenic diet on body composition and performance outcomes of endurance athletes, and ii...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28700514/low-volume-high-intensity-interval-versus-continuous-endurance-training-effects-on-hematological-and-cardiorespiratory-system-adaptations-in-professional-canoe-polo-athletes
#4
Mohsen Sheykhlouvand, Mohammadali Gharaat, Erfan Khalili, Hamid Agha-Alinejad, Farhad Rahmaninia, Hamid Arazi
The aim of this study was to compare the effect of two paddling-based high-intensity interval training (HIIT) and continuous endurance training (CET) on hematological, immunological, and cardiorespiratory adaptations in professional canoe polo athletes. Twenty one male canoe polo athletes were randomly divided into one of three groups (N=7): 1) HIIT with variable intensity (VIHIIT) (6×60-second at 100,110,120,130,130, 130,120,110,100% vV[Combining Dot Above]O2peak from 1 to 9 session respectively, 1:3 work to recovery ratio); 2) HIIT with variable volume (VVHIIT) (6,7,8,9,9,9,8,7,6 repetitions/session from 1 to 9 session respectively)×60-second at lowest velocity that elicited V[Combining Dot Above]O2peak (vV[Combining Dot Above]O2peak), 1:3 work to recovery ratio); and 3) the CET group performed 3 times × 60 min paddling sessions (75% vV[Combining Dot Above]O2peak) per week for 3 weeks...
July 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28690872/physiological-and-lipid-profile-response-to-acute-exercise-at-different-intensities-in-individuals-with-spinal-cord-injury
#5
Eduardo S Alves, Ronaldo Vt Santos, Francieli S Ruiz, Fabio S Lira, Alexandre A Almeida, Giscard Lima, Thatiana Cs Goni, Lila Oyama, Kate M Edwards, Sergio Tufik, Marco Túlio De Mello
STUDY DESIGN: Experimental and cross-sectional study. OBJECTIVE: To assess the immediate effect of exercise on heart rate (HR), oxygen uptake (VO2), pulmonary ventilation (PV), oxygen pulse (OP), glucose and lipids of wheelchair basketball players with spinal cord injury (SCI). SETTING: Center of Studies in Psychobiology and Exercise-São Paulo, Brazil. METHODS: In all, nine wheelchair basketball players with SCI and nine able-bodied controls (C) performed three exercise sessions at different intensities: ventilatory threshold 1 (VT1), 15% below VT1 and 15% above VT1 with a duration of ~24-34 min...
2017: Spinal Cord Series and Cases
https://www.readbyqxmd.com/read/28683177/determination-of-ideal-target-exercise-heart-rate-for-cardiac-patients-suitable-for-rehabilitation
#6
Shih Jia Janice Tan, John Carson Allen, Swee Yaw Tan
BACKGROUND: Exercise prescription for patients with cardiovascular disease remains a challenge. The concept of exercising at an intensity equivalent to one's anaerobic threshold has been well studied and highly recommended in the fitness industry for other populations. For this concept to be applicable to patients with cardiovascular disease, the level and intensity of activity must not trigger myocardial ischemia. HYPOTHESIS: We hypothesized that the heart rate at ventilatory anaerobic threshold (HRVAT ) will not exceed heart rate at ischemic threshold (HRIT ) (ie, HRVAT ≤ HRIT in a majority [>50%] of patients)...
July 6, 2017: Clinical Cardiology
https://www.readbyqxmd.com/read/28674606/comparison-of-ventilatory-measures-and-20-km-time-trial-performance
#7
Willard W Peveler, Brandy Shew, Samantha Johnson, Gabe Sanders, Roger Kollock
Performance threshold measures are used to predict cycling performance. Previous research has focused on long time trials (≥ 40 km) using power at ventilatory threshold and respiratory threshold to estimate time trial performance. As intensity greatly differs during shorter time trails applying findings from longer time trials may not be appropriate. The use of heart rate measures to determine 20 km time trial performance has yet to be examined. The purpose of this study was to determine the effectiveness of heart rate measures at ventilatory threshold (VE/VO2 Plotted and VT determined by software) and respiratory threshold (RER of 0...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28669689/effects-of-erythropoietin-on-cycling-performance-of-well-trained-cyclists-a-double-blind-randomised-placebo-controlled-trial
#8
Jules A A C Heuberger, Joris I Rotmans, Pim Gal, Frederik E Stuurman, Juliëtte van 't Westende, Titiaan E Post, Johannes M A Daniels, Matthijs Moerland, Peter L J van Veldhoven, Marieke L de Kam, Herman Ram, Olivier de Hon, Jelle J Posthuma, Jacobus Burggraaf, Adam F Cohen
BACKGROUND: Substances that potentially enhance performance (eg, recombinant human erythropoietin [rHuEPO]) are considered doping and are therefore forbidden in sports; however, the scientific evidence behind doping is frequently weak. We aimed to determine the effects of rHuEPO treatment in well trained cyclists on maximal, submaximal, and race performance and on safety, and to present a model clinical study for doping research on other substances. METHODS: We did this double-blind, randomised, placebo-controlled trial at the Centre for Human Drug Research in Leiden (Netherlands)...
June 29, 2017: Lancet Haematology
https://www.readbyqxmd.com/read/28657863/carbohydrate-intake-and-training-efficacy-a-randomized-cross-over-study
#9
Florian Beaudouin, Frederic Joerg, Anette Hilpert, Tim Meyer, Anne Hecksteden
Carbohydrate (CHO) availability during endurance exercise seems to attenuate exercise-induced perturbations of cellular homeostasis and might consequently diminish the stimulus for training adaptation. Therefore, a negative effect of CHO intake on endurance training efficacy seems plausible. This study aimed to test the influence of carbohydrate intake on the efficacy of an endurance training program on previously untrained healthy adults. A randomized cross-over trial (8-week wash-out period) was conducted in 23 men and women with two 8-week training periods (with vs...
June 28, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28657854/differences-between-relative-and-absolute-speed-and-metabolic-thresholds-in-rugby-league
#10
Tannath J Scott, Heidi R Thornton, Macfarlane T U Scott, Ben J Dascombe, Grant M Duthie
PURPOSE: This study compared relative and absolute speed and metabolic thresholds for quantifying match output in elite rugby league. METHODS: Twenty-six professional players competing in the National Rugby League (NRL) were monitored with global positioning systems (GPS) across a rugby league season. Absolute speed [moderate-intensity running (MIRTh >3.6 m·s(-1)); high intensity running (HIRTh > 5.2 m·s(-1))] and metabolic (>20 W·kg(-1)) thresholds were compared to individualised ventilatory [first (VT1IFT), and second (VT2IFT)] thresholds estimated from the 30-15 intermittent fitness test (30-15IFT), as well as the metabolic threshold associated with VT2IFT (HPmetVT2), to examine difference in match-play demands...
June 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28638349/cardiorespiratory-coordination-in-repeated-maximal-exercise
#11
Sergi Garcia-Retortillo, Casimiro Javierre, Robert Hristovski, Josep L Ventura, Natàlia Balagué
Increases in cardiorespiratory coordination (CRC) after training with no differences in performance and physiological variables have recently been reported using a principal component analysis approach. However, no research has yet evaluated the short-term effects of exercise on CRC. The aim of this study was to delineate the behavior of CRC under different physiological initial conditions produced by repeated maximal exercises. Fifteen participants performed 2 consecutive graded and maximal cycling tests. Test 1 was performed without any previous exercise, and Test 2 6 min after Test 1...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28636505/the-effect-of-aerobic-interval-training-and-continuous-training-on-exercise-capacity-and-its-determinants
#12
Nele Pattyn, Paul J Beckers, Véronique A Cornelissen, Ellen Coeckelberghs, Catherine De Maeyer, Geert Frederix, Kaatje Goetschalckx, Nadine Possemiers, Dirk Schepers, Emeline M Van Craenenbroeck, Kurt Wuyts, Viviane M Conraads, Luc Vanhees
Objective We aimed to investigate (1) the effects of aerobic interval training (AIT) and aerobic continuous training (ACT) on (sub)maximal exercise measures and its determinants including endothelial function, muscle strength and cardiac autonomic function, and (2) the relationship between exercise capacity and these determinants. Methods Two-hundred coronary artery disease (CAD) patients (58.4 ± 9.1 years) were randomized to AIT or ACT for 12 weeks. All patients performed a cardiopulmonary exercise test and endothelial function measurements before and after the intervention; a subpopulation underwent muscle strength and heart rate variability (HRV) assessments...
March 21, 2017: Acta Cardiologica
https://www.readbyqxmd.com/read/28626339/effects-of-2-week-intermittent-training-in-hypobaric-hypoxia-on-the-aerobic-energy-metabolism-and-performance-of-cycling-athletes-with-disabilities
#13
Sang-Hoon Kim, Ho-Jung An, Jung-Hyun Choi, Yong-Youn Kim
[Purpose] The present study aimed at examining changes in aerobic energy metabolism and performance in cycling athletes after 2 weeks of intermittent training in a multistep hypobaric hypoxia environment. [Subjects and Methods] We also aimed at using the findings to propose an efficient training program in hypobaric hypoxia for endurance athletes with disabilities. The study participants were three cycling athletes with physical disabilities from the Korean national team (A, B, and C athletes). They underwent complex (repetition, interval, and continued) training with a roller-type cycle in a multistep hypobaric hypoxia environment (simulated altitude, 4,000 m above sea level)...
June 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28625356/prognostic-markers-of-outcome-in-patients-undergoing-infra-inguinal-revascularisation-a-prospective-observational-pilot-study
#14
M Kanakaraj, D R Yates, R J T Wilson, M L Baroni, S J Davies
OBJECTIVES: The aim was to investigate whether cardiopulmonary exercise testing (CPET) variables derived from cycle and arm ergonometry correlate, and whether CPET variables and pre-operative N-terminal pro-brain natriuretic peptide (NT-proBNP) have prognostic significance and if the combination of the two has incremental value. METHODS: A prospective observational pilot study was conducted; 70 patients who underwent infra-inguinal bypass surgery were recruited...
June 15, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28609196/horizontal-ground-reaction-forces-to-stationary-running-performed-in-the-water-and-on-dry-land-at-different-physiological-intensities
#15
Cristine Lima Alberton, Stephanie Santana Pinto, Gabriela Neves Nunes, Douglas Guerreiro Dos Santos Rau, Paula Finatto, Amanda Haberland Antunes, Marcus Peikriszwili Tartaruga, Marco Bergamin, Eduardo Lusa Cadore, Luiz Fernando Martins Kruel
The aim of the present study was to compare the peak anterior-posterior (Fy) and medio-lateral (Fx) ground reaction forces (GRFs) of women performing stationary running at different intensities in aquatic and dry land environments. Fourteen young women performed the stationary running exercise at three cadences (first ventilatory threshold, second ventilatory threshold and maximum effort, as determined during exercise in water) in aquatic and dry land environments. Two-way repeated measures ANOVA was used to analyse the data (α = ...
June 13, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28606422/effect-of-aerobic-exercise-on-markers-of-bone-metabolism-of-overweight-and-obese-patients-with-chronic-kidney-disease
#16
Tarcisio Santana Gomes, Danilo Takashi Aoike, Flavia Baria, Fabiana G Graciolli, Rosa M A Moyses, Lilian Cuppari
OBJECTIVE: The aim of the study was to investigate the effect of aerobic exercise on markers of bone metabolism in overweight and obese nondialysis-dependent patients with chronic kidney disease. METHODS: This is a post-hoc study with 39 sedentary patients (55.5 ± 8.3 years, body mass index 31.2 ± 4.4 kg/m(2), estimated glomerular filtration rate 26.9 ± 11.7 mL/minute) who were randomly assigned to the aerobic exercise group (n = 24) or the control group (n = 15)...
June 9, 2017: Journal of Renal Nutrition
https://www.readbyqxmd.com/read/28560485/evaluation-of-end-tidal-co2-pressure-at-the-anaerobic-threshold-for-detecting-and-assessing-pulmonary-hypertension
#17
Akifumi Higashi, Yoshihiro Dohi, Sayuri Yamabe, Hiroki Kinoshita, Yoshiharu Sada, Toshiro Kitagawa, Takayuki Hidaka, Satoshi Kurisu, Hideya Yamamoto, Yuji Yasunobu, Yasuki Kihara
Cardiopulmonary exercise testing (CPET) is useful for the evaluation of patients with suspected or confirmed pulmonary hypertension (PH). End-tidal carbon dioxide pressure (PETCO2) during exercise is reduced with elevated pulmonary artery pressure. However, the utility of ventilatory parameters such as CPET for detecting PH remains unclear. We conducted a review in 155 patients who underwent right heart catheterization and CPET. Fifty-nine patients had PH [mean pulmonary arterial pressure (mPAP) ≥25 mmHg]...
May 30, 2017: Heart and Vessels
https://www.readbyqxmd.com/read/28553100/relationships-between-heart-rate-target-determined-in-different-exercise-testing-in-copd-patients-to-prescribed-with-individualized-exercise-training
#18
Claudine Fabre, Baptiste Chehere, Frédéric Bart, Patrick Mucci, Benoit Wallaert, Jean Marie Grosbois
BACKGROUND: It has been scientifically proven that pulmonary rehabilitation improves exercise tolerance and facilitates the carrying out of daily physical activities. To optimize the physical and physiological benefits, it is necessary to individualize the training intensity for each patient. The aim of this study is to compare the heart rate (HR) responses to three exercise modalities measuring aerobic fitness in chronic obstructive pulmonary disease patients, in order to easily prescribe individual target HRs for endurance training...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28550471/blood-lactate-accumulation-decreases-during-the-slow-component-of-oxygen-uptake-without-a-decrease-in-muscular-efficiency
#19
J M O'Connell, J M Weir, B R MacIntosh
Pulmonary oxygen uptake ([Formula: see text]) slowly increases during exercise above the anaerobic threshold, and this increase is called the slow component of [Formula: see text]. The mechanism of the increase in [Formula: see text] is assumed to be due to increasing energy cost associated with increasingly inefficient muscle contraction. We hypothesized that the increase in [Formula: see text] would be accompanied by a constant or increasing rate of accumulation of blood lactate, indicating sustained anaerobic metabolism while [Formula: see text] increased...
May 26, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28538301/proposal-of-a-new-specific-cardiopulmonary-exercise-test-for-taekwondo-athletes
#20
Marcus P Araujo, Antônio C L Nóbrega, Gabriel Espinosa, Matheus R Hausen, Renata R T Castro, Pedro P Soares, Jonas L Gurgel
The objective of this study is to evaluate the cardiorespiratory variables of Taekwondo athletes while performing incremental exercise test on an ergometer using a ramp protocol and to propose a specific protocol for assessing these physiological variables during Taekwondo practice. Fourteen athletes participated in 2 incremental exercise tests: a treadmill exercise test (TREADtest) and a Taekwondo-specific exercise test (TKDtest). The TKDtest consists in 1-minute stages of kicks with an incremental load between then...
June 2017: Journal of Strength and Conditioning Research
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