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https://www.readbyqxmd.com/read/28742112/energy-cost-of-isolated-resistance-exercises-across-low-to-high-intensities
#1
Victor Machado Reis, Nuno Domingos Garrido, Jeferson Vianna, Ana Catarina Sousa, José Vilaça Alves, Mário Cardoso Marques
This study aimed to estimate the energy cost across various intensities at eight popular resistance exercises: half squat, 45° inclined leg press, leg extension, horizontal bench press, 45° inclined bench press, lat pull down, triceps extension and biceps curl. 58 males (27.5 ± 4.9 years, 1.78 ± 0.06 m height, 78.67 ± 10.7 kg body mass and 11.4 ± 4.1% estimated body fat) were randomly divided into four groups of 14 subjects each. For each group, two exercises were randomly assigned and on different days, they performed four bouts of 5-min constant-intensity for each of the two assigned exercises: 12%, 16%, 20% and 24% 1-RM...
2017: PloS One
https://www.readbyqxmd.com/read/28741667/an-evaluation-of-the-validity-of-the-pre-operative-oxygen-uptake-efficiency-slope-as-an-indicator-of-cardiorespiratory-fitness-in-elderly-patients-scheduled-for-major-colorectal-surgery
#2
B C Bongers, A E Berkel, J M Klaase, N L van Meeteren
This study aimed to investigate the validity of the oxygen uptake efficiency slope as an objective and submaximal indicator of cardiorespiratory fitness in elderly patients scheduled for major colorectal surgery. Patients ≥ 60 years of age, with a metabolic equivalent score using the Veterans Activity Questionnaire ≤ 7 and scheduled for major colorectal surgery participated in a pre-operative cardiopulmonary exercise test. The oxygen uptake efficiency slope was calculated up to different exercise intensities, using 100%, 90% and 80% of the exercise data...
July 25, 2017: Anaesthesia
https://www.readbyqxmd.com/read/28738672/physiological-and-physical-responses-to-wearing-compression-garments-during-soccer-matches-and-recovery
#3
Diego Marqués-Jiménez, Julio Calleja-González, Iñaki Arratibel, Anne Delextrat, Fernando Uriarte, Nicolás Terrados
BACKGROUND: There is not enough information on the effects of compression therapy in soccer players during recovery after matches. So the objective of this study was to examine the effect of wearing compression garments during soccer matches and during recovery period on physical responses. METHODS: Eighteen semi-professional soccer players participated in this study. A two-stage crossover design was chosen. Participants acted as controls in one match and were assigned to an experimental group (compression stockings group, full-leg compression group, shorts group) in the other match...
July 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28737464/acute-glycemic-and-pressure-responses-of-continuous-and-interval-aerobic-exercise-in-patients-with-type-2-diabetes
#4
Éder Santiago, Rodrigo Sudatti Delevatti, Cláudia Gomes Bracht, Nathalie Netto, Salime Chedid Lisboa, Alexandra Ferreira Vieira, Rochelle Rocha Costa, Alexandra Hübner, Marco Antônio Fossati, Luiz Fernando Martins Kruel
BACKGROUND: Aerobic training has been widely indicated to patients with type 2 diabetes. However, there are still few studies comparing acute glycemic and blood pressure effects of different methods of aerobic training. The aim is to compare glycemic and pressure acute responses of continuous aerobic exercise to interval aerobic exercise in patients with type 2 diabetes. MATERIALS AND METHODS: This study is a randomized, crossover clinical trial. Fourteen patients with type 2 diabetes performed two sessions of aerobic training with different methods (continuous and interval)...
July 24, 2017: Clinical and Experimental Hypertension: CHE
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
#5
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/28704534/short-term-variation-in-ntprobnp-after-lifestyle-intervention-in-severe-obesity
#6
Debora Fedele, Virginia Bicchiega, Alessandro Collo, Federica Barutta, Erika Pistone, Gabriella Gruden, Graziella Bruno
AIM: Natriuretic peptides are not only involved in cardiovascular adaption to various conditions, but also in metabolic diseases. We performed this study to assess the effect of a very short time of lifestyle inpatient intervention on NTproBNP values in normotensive subjects with severe obesity and normal cardiac function. METHODS: We recruited 14 consecutive obese normotensive subjects with normal cardiac function who were aged 30 years and more and were referred to inpatient rehabilitation in an academic clinic over a two months period...
2017: PloS One
https://www.readbyqxmd.com/read/28690019/evaluation-of-the-benefits-of-exercise-on-cognition-in-major-depressive-disorder
#7
REVIEW
Tracy L Greer, Jennifer L Furman, Madhukar H Trivedi
BACKGROUND: Cognitive impairment is increasingly recognized as a significant symptom in patients with major depressive disorder (MDD). While exercise is already recommended in many treatment guidelines for patients with MDD and has been shown to improve cognition in other disorders (e.g., Alzheimer's, Parkinson's, schizophrenia), limited research is available evaluating the effect of exercise on cognition in MDD. METHODS: We provide a narrative review of existing literature regarding the effect(s) of exercise on cognition across several neurodegenerative and psychiatric diseases, and particularly in MDD, with specific emphasis on study design and methodology that may impair adequate synthesis of the results...
July 6, 2017: General Hospital Psychiatry
https://www.readbyqxmd.com/read/28683177/determination-of-ideal-target-exercise-heart-rate-for-cardiac-patients-suitable-for-rehabilitation
#8
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/28682948/skeletal-muscle-metabolic-dysfunction-in-patients-with-malignant-hyperthermia-susceptibility
#9
Sara J Thompson, Sheila Riazi, Natalia Kraeva, Michael D Noseworthy, Tammy E Rayner, Jane E Schneiderman, Barbara Cifra, Greg D Wells
BACKGROUND: Malignant hyperthermia (MH), a pharmacogenetic disorder of skeletal muscle, presents with a potentially lethal hypermetabolic reaction to certain anesthetics. However, some MH-susceptible patients experience muscle weakness, fatigue, and exercise intolerance in the absence of anesthetic triggers. The objective of this exploratory study was to elucidate the pathophysiology of exercise intolerance in patients tested positive for MH with the caffeine-halothane contracture test...
August 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28679061/mechanisms-that-modulate-peripheral-oxygen-delivery-during-exercise-in-heart-failure
#10
Tomohiko Kisaka, William W Stringer, Akira Koike, Piergiuseppe Agostoni, Karlman Wasserman
Oxygen uptake (V̇O2) measured at the mouth, which is equal to the cardiac output (C.O.) times the arterial-venous oxygen content difference [C(a-v)O2) ], increases over 10-20 fold in normal subjects during exercise. To achieve this substantial increase in oxygen uptake (V̇O2) = C.O. x C(a-v)O2) ) both cardiac output and arterial-venous difference must simultaneously increase. While this occurs in normal subjects, patients with heart failure cannot achieve significant increases in cardiac output and must rely primarily on changes in arterial-venous difference to increase V̇O2) during exercise...
July 5, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28674596/effects-of-nasal-or-oral-breathing-on-anaerobic-power-output-and-metabolic-responses
#11
Christine Recinto, Theodore Efthemeou, P Tony Boffelli, James W Navalta
Nasal and oral exclusive breathing modes have benefits and drawbacks during submaximal exercise. It is unknown whether these responses would extend to anaerobic work performed at high intensity. Nine individuals (males N = 7, females N = 2) performed a standard Wingate Anaerobic cycle test on a cycle ergometer under nose (N) and mouth (M) only respiratory conditions, performed in a counterbalanced order. A 2 (condition: nose, mouth) × 6 (time: 0-5 sec, 5-10 sec, 10-15 sec, 15-20 sec, 20-25 sec, 25-30 sec) repeated measures ANOVA was used to analyze the data with significance accepted at the p<0...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28658076/recovery-time-profiling-after-short-middle-and-long-distance-swimming-performance
#12
Alessandro Piras, Matteo Cortesi, Francesco Campa, Monica Perazzolo, Giorgio Gatta
We investigated cardiac autonomic responses and hemodynamic parameters on recovery time following short-, middle- and long-swimming performance. Ten male regional-level swimmers were tested to estimate time and frequency domains of arterial baroreflex sensitivity and heart rate variability after 100-, 200-, and 400-m of front crawl. We found a BRS reduction for 90 min after a maximal 100- and 200-m front crawl event, meanwhile the reflex was restored back to the baseline value about 70 min after 400-m. The vagally mediated HF power of R-R intervals was significantly reduced for 30 min after 400-m, and more than 90 min after 100- and 200-m, with a concomitant increase of sympathetic modulation...
June 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28657863/carbohydrate-intake-and-training-efficacy-a-randomized-cross-over-study
#13
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/28630704/the-effects-of-a-post-exercise-carbohydrate-and-protein-supplement-on-repeat-performance-serum-chemistry-insulin-and-glucagon-in-competitive-weight-pulling-dogs
#14
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/28630580/the-effect-of-upper-body-anaerobic-pre-loading-on-2000-m-ergometer-rowing-performance-in-college-level-male-rowers
#15
Priit Purge, Peter Hofmann, Rait Merisaar, Alexander Mueller, Gerhard Tschakert, Jarek Mäestu, Jaak Jürimäe
Elevated blood lactate has been shown to influence subsequent anaerobic exercise due to an inhibition of glycolysis. The aim of the present study was therefore to investigate the influence of a short and high-intensity anaerobic arm crank pre-load exercise (HIE) added to a low-intensity warm-up on cardio-respiratory and metabolic responses on a subsequent all out rowing exercise. Nine well-trained college level male rowers (24.6 ± 7.1 yrs; 1.87 ± 0.07 m; 88.9 ± 9.8 kg; 18.5 ± 3.7% body fat) volunteered to participate in the study...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28625356/prognostic-markers-of-outcome-in-patients-undergoing-infra-inguinal-revascularisation-a-prospective-observational-pilot-study
#16
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/28623435/the-brain-behaves-as-a-muscle
#17
Marinella Coco
It is known that lactate accumulates in the skeletal muscle during intense anaerobic exercise but is rapidly cleared from the muscles when they resume aerobic metabolism; however, at least some lactate reaches the blood stream. It has been observed that during maximal exercise, blood lactate increases with transport of the blood to the brain. This could be interpreted as a mechanism to protect against possible "central fatigue" in times of maximal activity during the course of which the lactate would preserve the functionality of the primary cortical motor and sensory areas, even at the expense of the efficiency of the other structures...
June 16, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28618202/effects-of-persistent-fontan-fenestration-patency-on-cardiopulmonary-exercise-testing-variables
#18
M Elisabeth Heal, Lanier B Jackson, Andrew M Atz, Ryan J Butts
Cardiopulmonary exercise testing (CPET) aids in clinical assessment of patients with Fontan circulation. Effects of persistent fenestration on CPET variables have not been clearly defined. Associations between fenestration and CPET variables at anaerobic threshold (AT) and peak exercise were explored in the Pediatric Heart Network Fontan Cross-Sectional Study cohort. Fenestration patency was associated with a greater decrease in oxygen saturation from rest to peak exercise (fenestration -4.9 ± 3.8 v. nonfenestration -3 ± 3...
June 15, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28617869/statins-are-related-to-impaired-exercise-capacity-in-males-but-not-females
#19
Martin Bahls, Stefan Groß, Till Ittermann, Raila Busch, Sven Gläser, Ralf Ewert, Henry Völzke, Stephan B Felix, Marcus Dörr
BACKGROUND: Exercise and statins reduce cardiovascular disease (CVD). Exercise capacity may be assessed using cardiopulmonary exercise testing (CPET). Whether statin medication is associated with CPET parameters is unclear. We investigated if statins are related with exercise capacity during CPET in the general population. METHODS: Cross-sectional data of two independent cohorts of the Study of Health in Pomerania (SHIP) were merged (n = 3,500; 50% males). Oxygen consumption (VO2) at peak exercise (VO2peak) and anaerobic threshold (VO2@AT) was assessed during symptom-limited CPET...
2017: PloS One
https://www.readbyqxmd.com/read/28617848/effect-of-caffeine-ingestion-on-anaerobic-capacity-quantified-by-different-methods
#20
Lucyana Arcoverde, Rodrigo Silveira, Fabiano Tomazini, André Sansonio, Romulo Bertuzzi, Adriano Eduardo Lima-Silva, Victor Amorim Andrade-Souza
We investigated whether caffeine ingestion before submaximal exercise bouts would affect supramaximal oxygen demand and maximal accumulated oxygen deficit (MAOD), and if caffeine-induced improvement on the anaerobic capacity (AC) could be detected by different methods. Nine men took part in several submaximal and supramaximal exercise bouts one hour after ingesting caffeine (5 mg·kg-1) or placebo. The AC was estimated by MAOD, alternative MAOD, critical power, and gross efficiency methods. Caffeine had no effect on exercise endurance during the supramaximal bout (caffeine: 131...
2017: PloS One
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