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https://www.readbyqxmd.com/read/28821962/influence-of-aerobic-fitness-on-vasoreactivity-in-young-men
#1
Preston L Bell, Edward T Kelley, Stephanie M McCoy, Daniel P Credeur
Previous work has demonstrated a direct relationship between aerobic fitness and vasodilatory function (i.e., flow-mediated dilation; FMD); however, the relation between aerobic fitness and vasoconstrictor responsiveness (i.e., low flow-mediated constriction; L-FMC), and the overall vasoactive range (FMD + L-FMC) is unclear. PURPOSE: To test the hypothesis that L-FMC and the overall vasoactive range (FMD + L-FMC) will be related to aerobic fitness in young, healthy men. METHODS: Twenty men (age: 23 ± 5 years) were recruited, and divided evenly into a higher (HF) vs...
August 18, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28818999/short-term-arrival-strategies-for-endurance-exercise-performance-at-moderate-altitude
#2
Joshua L Foss, Keren Constantini, Timothy D Mickleborough, Robert F Chapman
For sea level-based endurance athletes who compete at moderate and high altitudes, many are not logistically able to arrive at altitude weeks prior to the event to fully acclimatize. For those who can only arrive at altitude the night before competition, we asked if there is a physiological and performance advantage in reducing altitude exposure time to two hours prior to competition. On three separate visits, ten cyclists completed overnight laboratory exposures of: 1) a 14-hour exposure to normobaric hypoxia (16...
August 17, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28758518/allometric-scaling-of-power-force-velocity-ergometry-profiles-in-men
#3
Hamdi Jaafar
AIM: To examine the appropriate magnitude of allometric scaling of the force-velocity relationship according to body dimensions and to establish normative data for the power-force-velocity relationship for active men. SUBJECTS AND METHODS: Ninety-seven participants completed a force-velocity test on a Monark cycle ergometer. Allometric exponents and percentile ranks were established for maximal power (Pmax), maximal force (F0) and maximal velocity (V0). RESULTS: The mean (± SD) of Pmax, F0 and V0 were 1114...
July 31, 2017: Annals of Human Biology
https://www.readbyqxmd.com/read/28751842/anmco-aiic-sit-consensus-information-document-definition-precision-and-suitability-of-electrocardiographic-signals-of-electrocardiographs-ergometry-holter-electrocardiogram-telemetry-and-bedside-monitoring-systems
#4
Michele Massimo Gulizia, Giancarlo Casolo, Guerrino Zuin, Loredana Morichelli, Giovanni Calcagnini, Vincenzo Ventimiglia, Federica Censi, Pasquale Caldarola, Giancarmine Russo, Lorenzo Leogrande, Gian Franco Gensini
The electrocardiogram (ECG) signal can be derived from different sources. These include systems for surface ECG, Holter monitoring, ergometric stress tests, and telemetry systems and bedside monitoring of vital parameters, which are useful for rhythm and ST-segment analysis and ECG screening of electrical sudden cardiac death predictors. A precise ECG diagnosis is based upon correct recording, elaboration, and presentation of the signal. Several sources of artefacts and potential external causes may influence the quality of the original ECG waveforms...
May 2017: European Heart Journal Supplements: Journal of the European Society of Cardiology
https://www.readbyqxmd.com/read/28701211/inpatient-rehabilitation-for-adult-patients-with-marfan-syndrome-an-observational-pilot-study
#5
Dieter Benninghoven, Denise Hamann, Yskert von Kodolitsch, Meike Rybczynski, Julia Lechinger, Friedrich Schroeder, Marina Vogler, Eike Hoberg
BACKGROUND: Advances in medical, interventional and surgical treatment have increased average life expectancy of patients with congenital heart defects. As a result a new group of adult patients with congenital cardiac defects requires medical rehabilitation. Patients with Marfan syndrome (MFS) are a relevant group among these patients. So far, no reports on the effectiveness of specialized rehabilitation programmes for MFS patients exist. We implemented an inpatient 3-week rehabilitation program for MFS patients at the Muehlenberg-Clinic for rehabilitation and assessed the medical safety as well as the impact of the program on physical fitness and psychological wellbeing of participants by means of an observational pilot study...
July 12, 2017: Orphanet Journal of Rare Diseases
https://www.readbyqxmd.com/read/28677944/heart-rate-response-and-recovery-in-wheelchair-tetraplegic-rugby-athletes-a-pilot-study
#6
Michelle C Coutinho, Patrícia S Vigário, Agnaldo J Lopes, Fernando S Guimarães
BACKGROUND: Subjects with spinal cord injuries (SCI) have impaired autonomic cardiac regulation and increased risk of cardiovascular disease. In face of the insufficient research data on the autonomic control of physically active subjects with SCI, this study aimed at describing the chronotropic response, as well as the heart rate recovery behaviour of a cohort of elite wheelchair rugby athletes. METHODS: This is a cross-sectional study including a convenience sample of 17 elite wheelchair rugby athletes with tetraplegia...
July 5, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28658266/post-exercise-hypotension-and-heart-rate-variability-response-after-water-and-land-ergometry-exercise-in-hypertensive-patients
#7
Danilo Sales Bocalini, Marco Bergamin, Alexandre Lopes Evangelista, Roberta Luksevicius Rica, Francisco Luciano Pontes, Aylton Figueira, Andrey Jorge Serra, Emilly Martinelli Rossi, Paulo José Ferreira Tucci, Leonardo Dos Santos
BACKGROUND: systemic arterial hypertension is the most prevalent cardiovascular disease; physical activity for hypertensive patients is related to several beneficial cardiovascular adaptations. This paper evaluated the effect of water- and land-ergometry exercise sessions on post-exercise hypotension (PEH) of healthy normotensive subjects versus treated or untreated hypertensive patients. METHODS: Forty-five older women composed three experimental groups: normotensive (N, n = 10), treated hypertensive (TH, n = 15) and untreated hypertensive (UH, n = 20)...
2017: PloS One
https://www.readbyqxmd.com/read/28655190/right-ventricular-function-during-exercise-in-children-after-heart-transplantation
#8
B Cifra, C T Morgan, A Dragulescu, V C Guerra, C Slorach, M K Friedberg, C Manlhiot, B W McCrindle, A I Dipchand, L Mertens
Aims: Right ventricular (RV) dysfunction is a common problem after heart transplant (HTx). In this study, we used semi-supine bicycle ergometry (SSBE) stress echocardiography to evaluate RV systolic and diastolic reserve in paediatric HTx recipients. Methods and results: Thirty-nine pediatric HTx recipients and 23 controls underwent stepwise SSBE stress echocardiography. Colour tissue doppler imaging (TDI) peak systolic (s') and peak diastolic (e') velocities, myocardial acceleration during isovolumic contraction (IVA), and RV free wall longitudinal strain were measured at incremental heart rates (HR)...
June 23, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28637157/maximal-and-submaximal-aerobic-tests-for-wheelchair-dependent-persons-with-spinal-cord-injury-a-systematic-review-to-summarize-and-identify-useful-applications-for-clinical-rehabilitation
#9
Sophia Eerden, Rienk Dekker, Florentina J Hettinga
PURPOSE: To summarize the available maximal and submaximal aerobic exercise tests for wheelchair-dependent persons with a spinal cord injury (SCI) and to identify useful applications for clinical rehabilitation. METHOD: The databases of PubMed, CINAHL(®), EMBASE, and PsycINFO(®) were searched for English-language studies published prior to March 2015. Two independent raters identified and examined studies that reported on laboratory-based aerobic exercise tests in persons with an SCI, according to the PRISMA statement...
March 3, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28624677/cardiorespiratory-benefits-of-group-exercise-among-adults-with-serious-mental-illness
#10
Gerald J Jerome, Deborah Rohm Young, Arlene T Dalcin, Nae-Yuh Wang, Joseph Gennusa, Stacy Goldsholl, Lawrence J Appel, Gail L Daumit
This study examined cardiorespiratory fitness (CRF) among adults with serious mental illness (SMI) participating in group exercise classes. Overweight and obese adults with SMI were randomized to either a control condition or a weight management condition with group exercise classes (n = 222). Submaximal bicycle ergometry was used to assess CRF at baseline, 6 and 18 months. Those with ≥ 66% participation in the exercise classes had a lower heart rate response at 6 and 18 month follow-up. Participation in group exercise classes was associated with improved short and long term cardiovascular fitness among adults with SMI...
June 10, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28597120/long-term-prognostic-implications-of-myocardial-perfusion-imaging-in-octogenarians-an-all-comer-cohort-study
#11
Athanasios Katsikis, Athanasios Theodorakos, Vassiliki Manira, Spyridon Papaioannou, Genovefa Kolovou, Vassilios Voudris, Maria Koutelou
PURPOSE: Evaluation of the long-term prognostic value of myocardial perfusion imaging (MPI) in octogenarians. METHODS: Six hundred and twenty-nine octogenarians [51% previous myocardial infarction (MI) or revascularization] who underwent single-isotope MPI (78% (201)Tl, 22% (99m)Tc-tetrofosmin) with exercise (38% Bruce, 2% leg ergometry) or pharmacologic (58% adenosine, 2% dobutamine) stress were studied. All patients had LVEF determined by echocardiography within 1 month from MPI...
August 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28550471/blood-lactate-accumulation-decreases-during-the-slow-component-of-oxygen-uptake-without-a-decrease-in-muscular-efficiency
#12
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/28544202/breaking-up-sedentary-time-with-seated-upper-body-activity-can-regulate-metabolic-health-in-obese-high-risk-adults-a-randomised-crossover-trial
#13
Matthew McCarthy, Charlotte L Edwardson, Melanie J Davies, Joseph Henson, Alex Rowlands, James King, Danielle H Bodicoat, Kamlesh Khunti, Thomas Yates
AIMS: To investigate the impact of performing short bouts of seated upper body activity on postprandial blood glucose and insulin levels during prolonged sitting. MATERIALS AND METHODS: Participants undertook two 7 · 5 hour experimental conditions in a randomised order: 1) prolonged sitting only 2) sitting interspersed with 5 minutes of seated arm ergometry every 30 minutes. Blood samples were obtained while fasting and throughout the postprandial period following ingestion of two standardised meals...
May 23, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28543923/sex-differences-in-fitness-and-cardiac-function-during-exercise-in-adolescents-with-chronic-fatigue
#14
Paolo T Pianosi, Eric Emerling, Kristin C Mara, Amy L Weaver, Philip R Fischer
Females demonstrate less robust Frank-Starling mechanism with respect to cardiac preload than males at rest. We asked whether this phenomenon would also affect cardiac performance during exercise. We hypothesized that stroke volume (SV) response to exercise would be more limited in deconditioned females such that cardiac output would be mainly rate dependent, compared with males. We conducted a chart audit of clinical exercise tests performed by adolescents with chronic fatigue. Oxygen uptake (VO2 ) was measured breath-by-breath at rest and during cycle ergometry, while cardiac output was measured by acetylene rebreathing at rest plus 2-3 sub-threshold workloads...
May 24, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28539142/inspiratory-muscle-training-effects-on-cycling-during-acute-hypoxic-exposure
#15
RANDOMIZED CONTROLLED TRIAL
Mitch Lomax, Heather C Massey, James R House
INTRODUCTION: Hypoxic environments increase the physiological demands of exercise. Inspiratory muscle training can reduce the demands of exhaustive exercise in this environment. This study examined the impact of inspiratory muscle training on moderate intensity hypoxic cycling exercise. METHODS: There were 17 healthy adult men who undertook 4 wk of inspiratory muscle training (N = 8) or 4 wk of sham inspiratory muscle training (N = 9). Subjects completed four fixed intensity (100 W) and duration (10 min) cycle ergometry tests...
June 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28539128/impaired-cardiac-output-during-exercise-in-adults-operated-for-ventricular-septal-defect-in-childhood-a-hitherto-unrecognised-pathophysiological-response
#16
Benjamin Asschenfeldt, Johan Heiberg, Steffen Ringgaard, Marie Maagaard, Andrew Redington, Vibeke E Hjortdal
BACKGROUND: Recent studies have demonstrated that surgical ventricular septal defect closure in childhood is associated with reduced functional capacity and disruption of the right ventricular force-frequency relationship during exercise. To further describe long-term cardiac function, we performed a non-invasive assessment of cardiac index during exercise in adults having undergone surgery for ventricular septal defect in early childhood. METHODS: A total of 20 patients (surgical age 2...
May 25, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/28533889/effects-of-low-dose-acetazolamide-on-exercise-performance-in-simulated-altitude
#17
Ernst Elisabeth, Gatterer Hannes, Burtscher Johannes, Faulhaber Martin, Pocecco Elena, Burtscher Martin
Preventive effects of acetazolamide (ACZ) on acute mountain sickness (AMS) are well established but effects on exercise performance at high altitude or in hypoxia have been less considered and are still inconsistent. We hypothesized that low-dose ACZ would not impair exercise performance at simulated high altitude. Thus, the aim of this study was to evaluate the interaction between low-dose ACZ and exercise performance in normobaric hypoxia. Sixteen subjects (8 males and 8 females) were randomly assigned either to receive low-dose ACZ (3×125 mg in 36 hours) or placebo...
2017: International Journal of Physiology, Pathophysiology and Pharmacology
https://www.readbyqxmd.com/read/28516252/chronic-eccentric-arm-cycling-improves-maximum-upper-body-strength-and-power
#18
Steven J Elmer, Dakota J Anderson, Travis R Wakeham, Matthew A Kilgas, John J Durocher, Stan L Lindstedt, Paul C LaStayo
INTRODUCTION: Eccentric leg cycling (cycle ergometry adapted to impose muscle lengthening contractions) offers an effective exercise for restoring lower-body muscular function, maintaining health, and improving performance in clinical and athletic populations. PURPOSE: We extended this model to the upper body and evaluated the effectiveness of a 7-week eccentric arm cycling (ECCarm) intervention to improve upper-body muscular function. We also explored whether ECCarm would alter arterial function...
May 17, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28507191/lowering-metabolic-rate-mitigates-muscle-atrophy-in-western-fence-lizards
#19
J Balaban, E Azizi
Extended periods of skeletal muscle disuse can cause a significant loss of contractile proteins, which compromises the ability to generate force, mechanical work or power, thus compromising locomotor performance. Several hibernating organisms can resist muscle atrophy despite months of inactivity. This resistance has been attributed to a reduction in body temperature and metabolic rate and activation of physiological pathways that counteract pathways of protein degradation. However, in these systems such strategies are not mutually exclusive and the effects of these mechanisms can be difficult to separate...
May 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28499626/carbon-dioxide-exposure-resulting-from-hood-protective-equipment-used-in-joint-arthroplasty-surgery
#20
Suhani Patel, Janelle M Fine, Michael J Lim, Steven N Copp, Adam S Rosen, John B West, G Kim Prisk
BACKGROUND: To protect both the surgeon and patient during procedures, hooded protection shields are used during joint arthroplasty procedures. Headache, malaise, and dizziness, consistent with increased carbon dioxide (CO2) exposure, have been anecdotally reported by surgeons using hoods. We hypothesized that increased CO2 concentrations were causing reported symptoms. METHODS: Six healthy subjects (4 men) donned hooded protection, fan at the highest setting. Arm cycle ergometry at workloads of 12 and 25 watts (W) simulated workloads encountered during arthroplasty...
March 31, 2017: Journal of Arthroplasty
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