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Intermittent exercise

L Maïmoun, F Paris, O Coste, C Sultan
Participation in recreational physical activity is widely acknowledged to provide significant health benefits. Conversely, intense training imposes several constraints, such as intermittent or chronic metabolic and psychogenic training stressors and maintenance of very low body fat to maximize performance. Adolescent and adult athletic women are therefore at risk of overtraining and/or poor dietary intake, which may have several consequences for endocrine function particularly on hypothalamic-pituitary-gonadal axis...
October 14, 2016: Gynécologie, Obstétrique & Fertilité
Marco Ambrosetti
Patients with Lower Extremity Peripheral Artery Disease (LEPAD) have been recently identified as target groups for structured Cardiac Prevention and Rehabilitation (CPR) programs, whose core components and intervention goals are now well recognized. Historically, exercise training (ET) programs have been employed for the treatment of LEPAD with typical intermittent claudication, and several meta-analysis documented improvements in walking distances of enrolled patients. Both in American and European guidelines, a frequency of at least 3 sessions per week and program duration of 12 weeks were judged as optimal, while recommended sessions lengths were 30-45 minutes and 30-60 minutes respectively...
October 14, 2016: Monaldi Archives for Chest Disease, Archivio Monaldi Per le Malattie del Torace
Toshiyuki Ohya, Ryo Yamanaka, Hayato Ohnuma, Masahiro Hagiwara, Yasuhiro Suzuki
BACKGROUND: Some endurance athletes exhibit exercise-induced arterial hypoxemia during high-intensity exercise. Inhalation of hyperoxic gas during exercise has been shown to counteract this exercise-associated reduction in hemoglobin oxygen saturation (SaO2), but the effects of hyperoxic gas inhalation on performance and SaO2 during high-intensity intermittent exercise remain unclear. This study investigated the effects of hyperoxic gas inhalation on performance and SaO2 during high-intensity intermittent cycling exercise...
December 2016: Sports Medicine—Open
Ira Katz, Marine Pichelin, Spyridon Montesantos, Min-Yeong Kang, Bernard Sapoval, Kaixian Zhu, Charles-Philippe Thevenin, Robert McCoy, Andrew R Martin, Georges Caillibotte
Oxygen treatment based on intermittent-flow devices with pulse delivery modes available from portable oxygen concentrators (POCs) depends on the characteristics of the delivered pulse such as volume, pulse width (the time of the pulse to be delivered), and pulse delay (the time for the pulse to be initiated from the start of inhalation) as well as a patient's breathing characteristics, disease state, and respiratory morphology. This article presents a physiological-based analysis of the performance, in terms of blood oxygenation, of a commercial POC at different settings using an in silico model of a COPD patient at rest and during exercise...
2016: International Journal of Chronic Obstructive Pulmonary Disease
Konstantina Dipla, Areti Triantafyllou, Iris Grigoriadou, Evangelia Kintiraki, Georgios A Triantafyllou, Pavlos Poulios, Ioannis S Vrabas, Andreas Zafeiridis, Stella Douma, Dimitrios G Goulis
AIMS/HYPOTHESIS: Gestational diabetes mellitus (GDM) is a risk factor for the development of endothelial dysfunction and cardiovascular disease. However, in vivo microvascular endothelial function in GDM has not been investigated. This study aimed to examine, using near-infrared spectroscopy (NIRS), whether: (1) there are differences in microvascular reactivity and skeletal muscle oxygen consumption (m[Formula: see text]) at rest and during exercise between GDM and uncomplicated pregnancies; and (2) there is an association of NIRS indices with macrovascular function and cardiovascular disease risk factors...
October 8, 2016: Diabetologia
Valéria Leme Gonçalves Panissa, Ursula Ferreira Julio, Felipe Hardt, Carolina Kurashima, Fábio Santos Lira, Monica Yuri Takito, Emerson Franchini
The aim of this study was to compare the effects of exercise intensity on appetite control: relative energy intake (energy intake minus the energy expenditure of exercise; REI), hunger scores, and appetite-regulating hormones in men and women. Eleven men and 9 women were submitted to 4 experimental sessions: high-intensity intermittent all-out exercise (HIIE-A) for 60 × 8 s interspersed by 12 s of passive recovery; high-intensity intermittent exercise (HIIE) at 100% of maximal load attained in incremental test; steady-state exercise at 60% of maximal load, matched by work done; and a control session...
July 7, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Kelsey Merison, Howard Jacobs
While the diagnosis of migraine in children is generally straightforward, treatment can seem complex with a number of medication choices, many of which are used "off label." Patients with intermittent migraines can often be managed with ibuprofen or naproxen taken as needed. Unfortunately, by the time that children present to our practice, they have often tried these medications without improvement. Triptans are frequently prescribed to these patients with good success. It is important to make the patient aware of the possible associated serotonergic reactions...
November 2016: Current Treatment Options in Neurology
A Vahl, B Elsman, A van Enst
- Revision of the 2005 guideline 'Diagnostics and treatment of lower extremity peripheral arterial disease' and the development of an audit have instigated a degree of efficiency and transparency for the treatment of patients with peripheral arterial disease (PAD). - The key recommendations are that first-line treatment of patients, who - preferably by means of a consultation in a vascular laboratory - are diagnosed with intermittent claudication, is supervised exercise therapy and secondary prevention. Referral for second-line treatment only needs to occur when invasive therapy is considered, for example when there is insufficient improvement in symptoms or in patients who have or are developing critical ischemia...
2016: Nederlands Tijdschrift Voor Geneeskunde
C H Joo, R Allan, B Drust, G L Close, T S Jeong, J D Bartlett, C Mawhinney, J Louhelainen, J P Morton, Warren Gregson
PURPOSE: We tested the hypothesis that both post-exercise and passive cold water immersion (CWI) increases PGC-1α and VEGF mRNA expression in human skeletal muscle. METHOD: Study 1 Nine males completed an intermittent running protocol (8 × 3-min bouts at 90 % [Formula: see text], interspersed with 3-min active recovery (1.5-min at 25 % and 1.5-min at 50 % [Formula: see text]) before undergoing CWI (10 min at 8 °C) or seated rest (CONT) in a counterbalanced, randomised manner...
October 3, 2016: European Journal of Applied Physiology
Daniel R Machin, Heather L Clifton, Ryan S Garten, Jayson R Gifford, Russell S Richardson, D Walter Wray, Tracy M Frech, Anthony John Donato
Systemic sclerosis (SSc) is a rare, auto-immune disease characterized by debilitating fibrosis and vascular dysfunction, however, little is known about the circulatory response to exercise in this population. Therefore, we examined the peripheral hemodynamic and vasodilatory responses to handgrip exercise in 10 patients with SSc (61 ± 4 yr) and 15 age-matched healthy controls (56 ± 5 yr). Brachial artery diameter, blood flow, and mean arterial pressure (MAP), were determined at rest and during progressive static-intermittent handgrip exercise...
September 30, 2016: American Journal of Physiology. Heart and Circulatory Physiology
A C Moore, D L Burris
OBJECTIVE: During exercise, cartilage recovers interstitial fluid lost during inactivity, which explains how tissue thickness and joint space are maintained over time. This recovery phenomenon is currently explained by a combination of osmotic swelling during intermittent bath exposure and sub-ambient pressurization during unloading. This paper tests an alternate hypothesis that cartilage can retain and recover interstitial fluid in the absence of bath exposure and unloading when physiological hydrodynamics are present...
September 30, 2016: Osteoarthritis and Cartilage
Sandeep Aggarwal, Randy D Moore, Ross Arena, Brenda Marra, Amanda McBride, Brea Lamb, Billie-Jean Martin, James Stone
Peripheral arterial disease (PAD) is the result of atherosclerosis in the lower limb arteries, which can give rise to intermittent claudication (IC), limb ulceration, infections, and, in some circumstances, amputation. As a result of PAD, patients are frequently limited in both walking duration and speed. These ambulatory deficits impact both functional capacity and quality of life. The prevalence of PAD is increasing, and patients with this diagnosis have high cardiovascular morbidity and mortality. A comprehensive approach is required to improve outcomes in patients with PAD and include tobacco cessation, pharmacologic management of metabolic fitness, risk-factor modification, and exercise training...
October 2016: Canadian Journal of Cardiology
Ryan M Broxterman, Phillip F Skiba, Jesse C Craig, Samuel L Wilcox, Carl J Ade, Thomas J Barstow
The sustainable duration of severe intensity exercise is well-predicted by critical power (CP) and the curvature constant (W'). The development of the W'BAL model allows for the pattern of W' expenditure and reconstitution to be characterized and this model has been applied to intermittent exercise protocols. The purpose of this investigation was to assess the influence of relaxation phase duration and exercise intensity on W' reconstitution during dynamic constant power severe intensity exercise. Six men (24...
October 2016: Physiological Reports
Yuri Kriel, Hugo A Kerhervé, Christopher D Askew, Colin Solomon
PURPOSE: High intensity interval training (HIIT) has been proposed as a time-efficient format of exercise to reduce the chronic disease burden associated with sedentary behaviour. Changes in oxygen utilisation at the local tissue level during an acute session of HIIT could be the primary stimulus for the health benefits associated with this format of exercise. The recovery periods of HIIT effect the physiological responses that occur during the session. It was hypothesised that in sedentary individuals, local and systemic oxygen utilisation would be higher during HIIT interspersed with active recovery periods, when compared to passive recovery periods...
2016: PloS One
Mohamed Ali Hammami, Abderraouf Ben Abderrahman, Anthony C Hackney, Wiem Kebsi, Adam L Owen, Amar Nebigh, Ghazi Racil, Zouhair Tabka, Hassane Zouhal
The aim of this study was to investigate the effects of two soccer-training seasons on physical fitness and hormone concentrations in elite youth soccer players. Twenty male elite soccer players (SP, age 14.5 ± 0.4 years) and 20 male control subjects (CS, age 14.3 ± 0.3years) participated to the study. Anthropometric measurements, aerobic (Yo-Yo Intermittent Recovery Test Level 1 (YYIRT1)) and anaerobic soccer relevant performances (jump and sprint tests), blood testosterone (T), cortisol (C),sex hormone binding globulin (SHBG) and T/C ratio were assessed 5 times (from T0 to T4) during two competitive seasons...
September 23, 2016: Journal of Strength and Conditioning Research
Emily Tat, Richard Cheng, Jeffrey S Helfenstein
A 48-year-old woman with 40 years of intermittent squeezing chest pain presented with worsening symptoms. Results of an ambulatory electrocardiogram, echocardiogram, and exercise treadmill were unremarkable. Persistent symptoms prompted a computed tomography coronary angiogram (CTCA) that revealed mid-left anterior descending artery myocardial bridging (MB) that was not physiologically significant by exercise single-photon emission CT. Conservative treatment was pursued. Anatomic MB is prevalent in a large proportion of the general population and are increasingly identified by CTCA...
2016: Reviews in Cardiovascular Medicine
Alessandra Adami, Robert Cao, Janos Porszasz, Richard Casaburi, Harry B Rossiter
Low muscle oxidative capacity contributes to exercise intolerance in chronic obstructive pulmonary disease (COPD). Near-infrared spectroscopy (NIRS) allows non-invasive determination of the muscle oxygen consumption (mV̇O2) recovery rate constant (k), which is proportional to oxidative capacity assuming two conditions are met: 1) exercise intensity is sufficient to fully-activate mitochondrial oxidative enzymes; 2) sufficient O2 availability. We aimed to determine reproducibility (coefficient of variation, CV; intraclass correlation coefficient, ICC) of NIRS k assessment in the gastrocnemius of 64 participants with (FEV1 64±23%predicted) or without COPD (FEV1 98±14%predicted)...
September 19, 2016: Respiratory Physiology & Neurobiology
Oliver P Dewhirst, Hannah K Evans, Kyle Roskilly, Richard J Harvey, Tatjana Y Hubel, Alan M Wilson
Route taken and distance travelled are important parameters for studies of animal locomotion. They are often measured using a collar equipped with GPS. Collar weight restrictions limit battery size, which leads to a compromise between collar operating life and GPS fix rate. In studies that rely on linear interpolation between intermittent GPS fixes, path tortuosity will often lead to inaccurate path and distance travelled estimates. Here, we investigate whether GPS-corrected dead reckoning can improve the accuracy of localization and distance travelled estimates while maximizing collar operating life...
September 2016: Ecology and Evolution
Ryan P Vetreno, Yesha Patel, Urvi Patel, T Jordan Walter, Fulton T Crews
Serotonergic neurons of the raphe nucleus regulate sleep, mood, endocrine function, and other processes that mature during adolescence. Alcohol abuse and binge drinking are common during human adolescence. We tested the novel hypothesis that adolescent intermittent ethanol exposure would alter the serotonergic system that would persist into adulthood. Using a Wistar rat model of adolescent intermittent ethanol (AIE; 5.0 g/kg, i.g., 2-day on/2-day off from postnatal day [P]25 to P55), we found a loss of dorsal raphe nucleus (DRN) serotonin (5-HT)-immunoreactive (+IR) neurons that persisted from late adolescence (P56) into adulthood (P220)...
September 16, 2016: Brain, Behavior, and Immunity
Stephen J Ives, Wesley K Lefferts, Margret Wharton, Patricia C Fehling, Denise L Smith
: Heat stress increases cardiovascular strain and is of particular concern in occupations, such as firefighters, where individuals are required to perform strenuous work while wearing personal protective equipment (PPE). Sudden cardiac events are associated with strenuous activity and are the leading cause of duty-related death among firefighters, accounting for ∼50% of duty-related fatalities/year. Understanding the acute effects of exercise-induced heat stress (EIHS) on vascular endothelial function may provide insight into mechanisms precipitating acute coronary events in firefighters...
September 20, 2016: Experimental Physiology
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