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Ventilatory threshold

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https://www.readbyqxmd.com/read/29665432/moderate-intensity-exercise-boosts-the-n2-neural-inhibition-marker-a-randomized-and-counterbalanced-erp-study-with-precisely-controlled-exercise-intensity
#1
Tomasz S Ligeza, Marcin Maciejczyk, Patrycja Kałamała, Zbigniew Szygula, Miroslaw Wyczesany
A prior session of moderate intensity continuous exercise (MCE) benefits performance during tasks requiring conflict resolution but the specific cognitive process that underlies this improvement remains unknown. Many studies postulate that MCE increases inhibition, but ERP evidence is ambiguous due to significant differences across past procedures. Most importantly, exercise intensity, which modulates the relationship between acute exercise and cognitive processes, might have varied across past ERP studies...
April 14, 2018: Biological Psychology
https://www.readbyqxmd.com/read/29665262/effects-of-inspiratory-muscle-training-in-copd-patients-a-systematic-review-and-meta-analysis
#2
REVIEW
Marc Beaumont, Patrice Forget, Francis Couturaud, Gregory Reychler
OBJECTIVES: In chronic obstructive pulmonary disease (COPD), quality of life and exercise capacity are altered in relationship to dyspnea. Benefits of inspiratory muscle training (IMT) on quality of life, dyspnea and exercise capacity were demonstrated, but when it is associated to pulmonary rehabilitation (PR), its efficacy on dyspnea is not demonstrated. The aim of this systematic review with meta analysis was to verify the effect of IMT using threshold devices in COPD patients on dyspnea, quality of life, exercise capacity and inspiratory muscles strength, and the added effect on dyspnea of IMT associated with PR (versus PR alone)...
April 17, 2018: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/29623546/exercise-rehabilitation-in-ventricular-assist-device-recipients-a-meta-analysis-of-effects-on-physiological-and-clinical-outcomes
#3
REVIEW
Liza Grosman-Rimon, Spencer D Lalonde, Nina Sieh, Maureen Pakosh, Vivek Rao, Paul Oh, Sherry L Grace
Exercise rehabilitation in heart failure patients has been shown to improve quality of life (QoL) and survival. It is also recommended in clinical practice guidelines for ventricular assist device (VAD) recipients. However, there have only been two meta-analyses on the effects of exercise rehabilitation in VAD patients, on only two outcomes. The objective of the review was to quantitatively evaluate the effect of exercise rehabilitation in VAD recipients on functional capacity, exercise physiology parameters, chronotropic responses, inflammatory biomarkers and neurohormones, heart structure and function, and clinical outcomes...
April 6, 2018: Heart Failure Reviews
https://www.readbyqxmd.com/read/29609470/relationships-between-glycemic-control-and-cardiovascular-fitness
#4
Elizabeth W Moxley, Donald Smith, Lauretta Quinn, Chang Gi Park
INTRODUCTION: Diabetes is a serious health problem affecting approximately 29.1 million individuals in the United States. Another 86 million have prediabetes. The development and implementation of lifestyle modifications such as physical activity for these persons are among the most effective methods for prevention and treatment. OBJECTIVE: The aim of this study was to examine relationships between glycemic control (HbA1c) and cardiovascular fitness (peak maximal oxygen uptake [VO2 peak] and ventilatory threshold [VT]) in overweight/obese subjects with and without type 2 diabetes (T2DM)...
January 1, 2018: Biological Research for Nursing
https://www.readbyqxmd.com/read/29601082/cardiopulmonary-fitness-before-and-after-neoadjuvant-chemotherapy-in-patients-with-oesophagogastric-cancer
#5
M Navidi, A W Phillips, S M Griffin, K E Duffield, A Greystoke, K Sumpter, R C F Sinclair
BACKGROUND: Neoadjuvant chemotherapy may have a detrimental impact on cardiorespiratory reserve. Determination of oxygen uptake at the anaerobic threshold by cardiopulmonary exercise testing (CPET) provides an objective measure of cardiorespiratory reserve. Anaerobic threshold can be used to predict perioperative risk. A low anaerobic threshold is associated with increased morbidity after oesophagogastrectomy. The aim of this study was to establish whether neoadjuvant chemotherapy has an adverse effect on fitness, and whether there is recovery of fitness before surgery for oesophageal and gastric adenocarcinoma...
March 30, 2018: British Journal of Surgery
https://www.readbyqxmd.com/read/29600726/aerobic-with-resistance-training-or-aerobic-training-alone-poststroke-a-secondary-analysis-from-a-randomized-clinical-trial
#6
Susan Marzolini, Dina Brooks, Paul Oh, David Jagroop, Bradley J MacIntosh, Nicole D Anderson, David Alter, Dale Corbett
BACKGROUND: Stroke is associated with muscle atrophy and weakness, mobility deficits, and cardiorespiratory deconditioning. Aerobic and resistance training (AT and RT) each have the potential to improve deficits, yet there is limited evidence on the utility of combined training. OBJECTIVE: To examine the effects of AT+RT versus AT on physiological outcomes in chronic stroke with motor impairments. METHODS: Participants (n = 73) were randomized to 6 months of AT (5 d/wk) or AT+RT (3 and 2 d/wk, respectively)...
March 1, 2018: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/29588313/reliability-and-physiological-interpretation-of-pulmonary-gas-exchange-by-circulatory-equivalents-in-chronic-heart-failure
#7
Chunting Tan, Harry B Rossiter, Janos Porszasz, T Scott Bowen, Klaus K Witte, William W Stringer, Richard Casaburi, James E Hansen
BACKGROUND: Peak ratios of pulmonary gas-exchange to ventilation during exercise (V˙O2/V˙E and V˙CO2/V˙E, termed "circulatory equivalents") are sensitive to heart failure (HF) severity, likely reflecting low and/or poorly distributed pulmonary perfusion. We tested whether peak V˙O2/V˙E and V˙CO2/V˙E would: (1) distinguish HF patients from controls; (2) be independent of incremental exercise protocol; and (3) correlate with lactate threshold (LT) and ventilatory compensation point (VCP), respectively...
March 27, 2018: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29588114/post-marathon-cardiac-troponin-t-is-associated-with-relative-exercise-intensity
#8
A J Richardson, T Leckie, E R Watkins, D Fitzpatrick, R Galloway, R Grimaldi, P Baker
OBJECTIVES: This study aimed to investigate whether measures of cardiopulmonary fitness and relative exercise intensity were associated with high sensitivity cardiac troponin T (cTnT) rise after a road marathon. METHODS: Fifty-two marathon runners (age 39±11 years, body mass 76.2±12.9kg, height 1.74±0.09m) attended the laboratory between 2 and 3 weeks prior to attempting the Brighton Marathon, UK. Running economy at 10kmh-1 (RE10) and race pace (RERP), ventilatory threshold (VT) and VO2 max tests were completed...
March 2, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29566090/aerobic-fitness-in-professional-soccer-players-after-anterior-cruciate-ligament-reconstruction
#9
Adriano Marques de Almeida, Paulo Roberto Santos Silva, André Pedrinelli, Arnaldo J Hernandez
Although anterior cruciate ligament (ACL) reconstruction is considered a successful procedure in restoring knee stability, few studies have addressed the issue of aerobic capacity after ACL surgery. Soccer players need technical, tactical and physical skills to succeed, such as good knee function and aerobic capacity. Our purpose is to evaluate aerobic fitness in ACL injured professional football players and six months after ACL reconstruction compared to a control group. Twenty athletes with ACL injury were evaluated and underwent ACL reconstruction with hamstrings autograft, and were compared to twenty healthy professional soccer players...
2018: PloS One
https://www.readbyqxmd.com/read/29541332/association-between-different-non-invasively-derived-thresholds-with-lactate-threshold-during-graded-incremental-exercise
#10
Conor Raleigh, Bernard Donne, Neil Fleming
We compared lactate threshold (TLac ) with non-invasive markers of an aerobic-anaerobic transition; namely, ventilatory (VT) and tissue saturation index (TSIT ) thresholds. While identification of a breakpoint in blood lactate concentration ([BLa]) is common for determination of an aerobic-anaerobic transition, non-invasive measures, VT and NIRS, have also received attention as a means of determining this critical exercise intensity. We hypothesised that one or other of these non-invasive measures would have a strong association with TLac ...
2018: International Journal of Exercise Science
https://www.readbyqxmd.com/read/29526454/chronotropic-incompetence-of-the-heart-is-associated-with-exercise-intolerance-in-patients-with-schizophrenia
#11
Marco Herbsleb, Andy Schumann, Berend Malchow, Christian Puta, P Christian Schulze, Holger W Gabriel, Karl-Jürgen Bär
The elevated cardiovascular risk of patients with schizophrenia contributes to a reduced life expectancy of 15-20years. This study investigated whether cardiac autonomic dysfunction (CADF) in schizophrenia is related to chronotropic incompetence, an established cardiovascular risk marker. We investigated thirty-two patients suffering from paranoid schizophrenia and thirty-two control subjects matched for age, sex, body mass index and fat free mass. A cardiopulmonary exercise test (CPET) was performed to study heart rate responses to exercise as well as submaximal (ventilatory threshold 1, VT1 ) and maximal endurance capacities (peak oxygen consumption, VO2peak ; peak power output, Ppeak )...
March 8, 2018: Schizophrenia Research
https://www.readbyqxmd.com/read/29523922/a-novel-mechanism-for-improved-exercise-performance-in-pediatric-fontan-patients-after-cardiac-rehabilitation
#12
Samuel Wittekind, Wayne Mays, Yvette Gerdes, Sandra Knecht, John Hambrook, William Border, John Lynn Jefferies
Patients with a Fontan circulation have impaired exercise capacity. Cardiac rehabilitation (CR) has shown promise in enhancing peak exercise parameters in this population, but an improvement in submaximal exercise has not been consistently demonstrated. We assessed the hypothesis that participation in CR will be associated with more efficient oxygen extraction and ventilation during submaximal exercise. In this prospective study, pediatric Fontans completed two 60 min CR sessions per week for 12 weeks. Cardiopulmonary exercise testing and stress echocardiography were performed at baseline and last CR session, and then compared with a paired sample t test...
March 9, 2018: Pediatric Cardiology
https://www.readbyqxmd.com/read/29519728/optimizing-risk-stratification-in-heart-failure-and-the-selection-of-candidates-for-heart-transplantation
#13
Tiago Pereira-da-Silva, Rui M Soares, Ana Luísa Papoila, Iola Pinto, Joana Feliciano, Luís Almeida-Morais, Ana Abreu, Rui Cruz Ferreira
INTRODUCTION AND AIMS: Selecting patients for heart transplantation is challenging. We aimed to identify the most important risk predictors in heart failure and an approach to optimize the selection of candidates for heart transplantation. METHODS: Ambulatory patients followed in our center with symptomatic heart failure and left ventricular ejection fraction ≤40% prospectively underwent a comprehensive baseline assessment including clinical, laboratory, electrocardiographic, echocardiographic, and cardiopulmonary exercise testing parameters...
March 5, 2018: Portuguese Journal of Cardiology: An Official Journal of the Portuguese Society of Cardiology
https://www.readbyqxmd.com/read/29517834/properties-of-the-vastus-lateralis-muscle-in-relation-to-age-and-physiological-function-in-master-cyclists-aged-55-79-years
#14
Ross D Pollock, Katie A O'Brien, Lorna J Daniels, Kathrine B Nielsen, Anthea Rowlerson, Niharika A Duggal, Norman R Lazarus, Janet M Lord, Andrew Philp, Stephen D R Harridge
In this study, results are reported from the analyses of vastus lateralis muscle biopsy samples obtained from a subset (n = 90) of 125 previously phenotyped, highly active male and female cyclists aged 55-79 years in regard to age. We then subsequently attempted to uncover associations between the findings in muscle and in vivo physiological functions. Muscle fibre type and composition (ATPase histochemistry), size (morphometry), capillary density (immunohistochemistry) and mitochondrial protein content (Western blot) in relation to age were determined in the biopsy specimens...
March 8, 2018: Aging Cell
https://www.readbyqxmd.com/read/29502328/aerobic-interval-vs-continuous-training-in-patients-with-coronary-artery-disease-or-heart-failure-an-updated-systematic-review-and-meta-analysis-with-a-focus-on-secondary-outcomes
#15
REVIEW
Nele Pattyn, Randy Beulque, Véronique Cornelissen
BACKGROUND: In a previous meta-analysis including nine trials comparing aerobic interval training with aerobic continuous training in patients with coronary artery disease, we found a significant difference in peak oxygen uptake favoring aerobic interval training. OBJECTIVE: The objective of this study was to (1) update the original meta-analysis focussing on peak oxygen uptake and (2) evaluate the effect on secondary outcomes. METHODS: We conducted a systematic review with a meta-analysis by searching PubMed and SPORTDiscus databases up to March 2017...
March 3, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29492407/reproducibility-of-hypercapnic-ventilatory-response-measurements-with-steady-state-and-rebreathing-methods
#16
Denise C Mannée, Timon M Fabius, Michiel Wagenaar, Michiel M M Eijsvogel, Frans H C de Jongh
In this study, the hypercapnic ventilatory response (HCVR) was measured, defined as the ventilation response to carbon dioxide tension ( P CO2 ). We investigated which method, rebreathing or steady-state, is most suitable for measurement of the HCVR in healthy subjects, primarily based on reproducibility. Secondary outcome parameters were subject experience and duration. 20 healthy adults performed a rebreathing and steady-state HCVR measurement on two separate days. Subject experience was assessed using numeric rating scales (NRS)...
January 2018: ERJ Open Research
https://www.readbyqxmd.com/read/29477233/-behaviour-of-stroke-volume-variation-in-hemodynamic-stable-patients-during-thoracic-surgery-with-one-lung-ventilation-periods
#17
María Lema Tome, Francisco Andrés De la Gala, Patricia Piñeiro, Luis Olmedilla, Ignacio Garutti
INTRODUCTION: In last few years, emphasis was placed in goal-directed therapy in order to optimize patient's hemodynamic status and improve their prognosis. Parameters based on the interaction between heart and lungs have been questioned in situations like low tidal volume and open chest surgery. The goal of the study was to analyze the changes that one-lung ventilation can produce over stroke volume variation and to assess the possible impact of airway pressures and lung compliance over stroke volume variation...
February 21, 2018: Revista Brasileira de Anestesiologia
https://www.readbyqxmd.com/read/29475209/perceptually-regulated-exercise-test-allows-determination-of-v%C3%AB-o2max-and-ventilatory-threshold-but-not-respiratory-compensation-point-in-trained-runners
#18
Perrine Truong, Gregoire P Millet, Boris Gojanovic
This study aimed to investigate the differences in maximal oxygen uptake (V̇O2max ) and submaximal thresholds between a standard graded exercise test (GXT) and a perceptually regulated graded exercise test (PRGXT) in trained runners. Eleven well-trained middle- to long-distance runners performed both tests in a randomized order. PRGXT used incremental "clamps" of rating of perceived exertion (RPE) over 10×1-min stages on an automated treadmill equipped with a sonar sensor allowing them to change their running speed instantly and in a natural way...
February 23, 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29468072/investigation-of-cardiopulmonary-exercise-testing-using-a-dynamic-leg-press-and-comparison-with-a-cycle-ergometer
#19
Farouk Chrif, Tobias Nef, Kenneth J Hunt
Background: Leg-press machines are widely employed for musculoskeletal conditioning of the lower-limbs and they provide cardiovascular benefits for resistance training in cardiac patients. The aim of this study was to assess the feasibility of a dynamic leg press (DLP) for incremental cardiopulmonary exercise testing (CPET) and to compare the results with those obtained using a cycle ergometer (CE). Methods: Twelve healthy participants aged 27±4 years (mean ± standard deviation) performed incremental cardiopulmonary exercise tests on a DLP and on a CE...
2018: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29435641/wave-intensity-as-a-useful-modality-for-assessing-ventilation-perfusion-imbalance-in-subclinical-patients-with-hypertension
#20
Yoshie Nogami, Yoshihiro Seo, Masayoshi Yamamoto, Tomoko Ishizu, Kazutaka Aonuma
Wave intensity (WI) is a novel noninvasive index of circulatory dynamics that reflects ventriculo-arterial coupling. It is calculated as the product of the first derivative of blood pressure and that of flow velocity measured by carotid echocardiography. This study aimed to clarify the clinical implications of WI and its relation with carbon dioxide production (VE/VCO 2 slope). Twenty-one healthy volunteers (control group) and 21 patients with hypertension (HT group) underwent cardiopulmonary exercise testing (CPX) and exercise stress echocardiography...
February 12, 2018: Heart and Vessels
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