keyword
MENU ▼
Read by QxMD icon Read
search

Ventilatory threshold

keyword
https://www.readbyqxmd.com/read/29230797/the-association-of-pre-operative-home-accelerometry-with-cardiopulmonary-exercise-variables
#1
H W Cui, G S Kirby, K Surmacz, C Hargrove, J Griffiths, B W Turney
We investigated the association of pre-operative activity, reported by the Duke Activity Score Index, Short Form-12 and measured by an accelerometer worn at home, with five cardiopulmonary exercise variables: peak power; peak oxygen consumption; anaerobic threshold; and ventilatory equivalents for oxygen and carbon dioxide. Fifty patients scheduled for major surgery underwent a standard pre-operative cardiopulmonary exercise test and wore a chest-mounted triaxial accelerometer for a mean (SD) duration of 3...
December 12, 2017: Anaesthesia
https://www.readbyqxmd.com/read/29228393/quantifying-the-arousal-threshold-using-polysomnography-in-obstructive-sleep-apnea
#2
Scott A Sands, Philip I Terrill, Bradley A Edwards, Luigi Taranto Montemurro, Ali Azarbarzin, Melania Marques, Camila M de Melo, Stephen H Loring, James P Butler, David White, Andrew Wellman
Objectives: Precision medicine for obstructive sleep apnea (OSA) requires non-invasive estimates of each patient's pathophysiological "traits". Here we provide the first, automated technique to quantify the respiratory arousal threshold-defined as the level of ventilatory drive triggering arousal from sleep-using diagnostic polysomnographic signals in patients with OSA. Methods: Ventilatory drive preceding clinically-scored arousals was estimated from polysomnographic studies by fitting a respiratory control model (Terrill P et al...
November 9, 2017: Sleep
https://www.readbyqxmd.com/read/29227735/effect-of-8-weeks-of-concurrent-plyometric-and-running-training-on-spatiotemporal-and-physiological-variables-of-novice-runners
#3
Josué Gómez-Molina, Ana Ogueta-Alday, Jesus Camara, Christopher Stickley, Juan García-López
Concurrent plyometric and running training has the potential to improve running economy (RE) and performance through increasing muscle strength and power, but the possible effect on spatiotemporal parameters of running has not been studied yet. The aim of this study was to compare the effect of 8 weeks of concurrent plyometric and running training on spatiotemporal parameters and physiological variables of novice runners. Twenty-five male participants were randomly assigned into two training groups; running group (RG) (n = 11) and running + plyometric group (RPG) (n = 14)...
December 11, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29216289/effects-of-load-carriage-on-physiological-determinants-in-adventure-racers
#4
Alex de O Fagundes, Elren P Monteiro, Leandro T Franzoni, Bruna S Fraga, Patrícia D Pantoja, Gabriela Fischer, Leonardo A Peyré-Tartaruga
Adventure racing athletes need run carrying loads during the race. A better understanding of how different loads influence physiological determinants in adventure racers could provide useful insights to gauge training interventions to improve running performance. We compare the maximum oxygen uptake (VO2max), the cost of transport (C) and ventilatory thresholds of twelve adventure running athletes at three load conditions: unloaded, 7 and 15% of body mass. Twelve healthy men experienced athletes of Adventure Racing (age 31...
2017: PloS One
https://www.readbyqxmd.com/read/29214926/aerobic-training-performed-at-ventilatory-threshold-improves-liver-enzymes-and-lipid-profile-related-to-non-alcoholic-fatty-liver-disease-in-adolescents-with-obesity
#5
Camila Tc de Lira, Marcos Am Dos Santos, Priscyla P Gomes, Yara L Fidelix, Ana Co Dos Santos, Thiago Rs Tenório, Mara C Lofrano-Prado, Wagner L do Prado
BACKGROUND: Despite the positive effects of high-intensity training on weight management and health-related outcomes, it is postulated that high-intensity training may also induce oxidative stress, increasing hepatic damage. AIM: The aim of this study was to compare the effects of low versus high-intensity training on biomarkers related to non-alcoholic fatty liver disease (NAFLD) in adolescents with obesity. METHODS: For this study 107 adolescents (15 ± 1 years) with obesity (BMI = 34...
December 2017: Nutrition and Health
https://www.readbyqxmd.com/read/29206781/perceptual-responses-to-high-and-moderate-intensity-interval-exercise-in-adolescents
#6
Adam A Malik, Craig A Williams, Kathryn L Weston, Alan R Barker
PURPOSE: High-intensity continuous exercise is proposed to evoke unpleasant sensations as predicted by the dual mode theory (DMT), and may negatively impact on future exercise adherence. Previous studies support unpleasant sensations in affective responses during continuous high-intensity exercise, but the affect experience during high-intensity interval exercise (HIIE) involving brief bursts of high-intensity exercise separated by low-intensity activity is poorly understood in adolescents...
December 2, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29184292/cardiopulmonary-rehabilitation-program-impact-on-prognostic-markers-in-selected-patients-with-resting-and-exercise-induced-ventilatory-inefficiency-a-clinical-trial
#7
Sherin Hassan M Mehani, Heba Ahmed A Abdeen
[Purpose] Ventilatory limitation is a common problem in patients with chronic heart failure and pulmonary hypertension. Excess ventilation may arise from augmented ventilatory drive, over activity of chemoreceptors and muscle ergoreceptors, or premature onset of lactic acidosis. Exertional dyspnea can cause limitations in the activities of daily living and as a result, reduced quality of life for these patients. The aim of the present study was to evaluate the effect of cardiopulmonary rehabilitation program on ventilatory efficiency for these patients...
October 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29171164/exercise-performance-haemodynamics-and-respiratory-pattern-do-not-identify-heart-failure-patients-who-end-exercise-with-dyspnoea-from-those-with-fatigue
#8
Marco Morosin, Stefania Farina, Carlo Vignati, Emanuele Spadafora, Susanna Sciomer, Elisabetta Salvioni, Gianfranco Sinagra, Piergiuseppe Agostoni
AIMS: The two main symptoms referred by chronic heart failure (HF) patients as the causes of exercise termination during maximal cardiopulmonary exercise testing (CPET) are muscular fatigue and dyspnoea. So far, a physiological explanation why some HF patients end exercise because of dyspnoea and others because of fatigue is not available. We assessed whether patients referring dyspnoea or muscular fatigue may be distinguished by different ventilator or haemodynamic behaviours during exercise...
November 24, 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/29170358/cardiopulmonary-fitness-in-children-with-congenital-heart-diseases-versus-healthy-children
#9
Pascal Amedro, Arthur Gavotto, Sophie Guillaumont, Helena Bertet, Marie Vincenti, Gregoire De La Villeon, Charlène Bredy, Philippe Acar, Caroline Ovaert, Marie-Christine Picot, Stefan Matecki
OBJECTIVE: We aimed to compare the cardiopulmonary fitness of children with congenital heart diseases (CHD) with that of age-adjusted and gender-adjusted controls. We also intended to identify clinical characteristics associated with maximum oxygen uptake (VO2max) in this population. METHODS AND RESULTS: We included in a cross-sectional multicentre study a total of 798 children (496 CHD and 302 controls) who underwent a complete cardiopulmonary exercise test (CPET)...
November 23, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/29091915/affect-during-incremental-exercise-the-role-of-inhibitory-cognition-autonomic-cardiac-function-and-cerebral-oxygenation
#10
Weslley Quirino Alves da Silva, Eduardo Bodnariuc Fontes, Rodrigo Menezes Forti, Zayonara Larissa Lima, Daniel Gomes da Silva Machado, Andréa Camaz Deslandes, Erika Hussey, Nathan Ward, Rickson Coelho Mesquita, Alexandre Hideki Okano, Hassan Mohamed Elsangedy
BACKGROUND: Pleasure is a key factor for physical activity behavior in sedentary individuals. Inhibitory cognitive control may play an important role in pleasure perception while exercising, especially at high intensities. In addition, separate work suggests that autonomic regulation and cerebral hemodynamics influence the affective and cognitive responses during exercise. PURPOSE: We investigated the effects of exercise intensity on affect, inhibitory control, cardiac autonomic function, and prefrontal cortex (PFC) oxygenation...
2017: PloS One
https://www.readbyqxmd.com/read/29080964/effects-of-an-individualized-home-based-unsupervised-aerobic-training-on-body-composition-and-physiological-parameters-in-obese-adults-are-independent-of-gender
#11
G P Emerenziani, M C Gallotta, S Migliaccio, D Ferrari, E A Greco, F J Saavedra, S Iazzoni, A Aversa, L M Donini, A Lenzi, C Baldari, L Guidetti
PURPOSE: Evaluation of the effects of an individualized home-based unsupervised aerobic training on body composition, physical and physiological parameters in female and male obese adults. METHODS: Two hundred and twenty obese adults (age 47.9 ± 12.4 years; BMI 38.0 ± 7.2 kg/m(2)) entered the 4-month training program. Body composition, physiological and functional capacities were assessed pre- and post-intervention. All subjects were requested to perform unsupervised aerobic training with the intensity based on heart rate, walking speed and OMNI-RPE score corresponding to the individual ventilatory threshold for at least 5 days/week...
October 28, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/29077639/short-trail-running-race-beyond-the-classic-model-for-endurance-running-performance
#12
Sabine Ehrström, Marcus P Tartaruga, Christopher S Easthope, Jeanick Brisswalter, Jean-Benoit Morin, Fabrice Vercruyssen
PURPOSE: To examine the extent to which the classical physiological variables of endurance running performance [VO2max, %VO2max at ventilatory threshold (VT), and running economy (RE)], but also muscle strength factors contribute to short trail running (TR) performance. METHODS: A homogeneous group of nine highly-trained trail runners performed an official TR race (27-km) and laboratory-based sessions to determine VO2max, %VO2max at VT, level RE (RE0%) and RE on a +10% slope (RE+10%), voluntary concentric and eccentric knee extension torques (MVCCon and MVCEcc, respectively), local endurance assessed by a fatigue index (FI) and a time to exhaustion at 87...
October 26, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29060898/a-modified-d-max-method-to-estimate-heart-rate-at-a-ventilatory-threshold-during-an-incremental-exercise-test
#13
Dae-Geun Jang, Byung-Hoon Ko, Sub Sunoo, Sang-Seok Nam, Hun-Young Park, Sang-Kon Bae
The purpose of this study was to design a modified D-max method to determine heart rate at a ventilatory threshold (HRVT) and to investigate whether this method would be valid during incremental exercise tests. The HRVT was estimated from a new parameter defined as HR at the maximal difference point between linearly- and quadratically approximated HR trends (modified D-max method). HR and ventilatory gas data for 105 subjects (53 males and 52 females; 38.26 ± 12.06 years; 166.62 ± 8.21 cm; 65.31 ± 11.10 kg) were simultaneously collected during an incremental treadmill test to evaluate the validity of the modified D-max method...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29059227/exergaming-feels-good-despite-working-harder
#14
Kate Glen, Roger Eston, Tobias Loetscher, Gaynor Parfitt
Strategies to encourage exercise have led to research on cycle ergometer 'exergaming', as a means of enhancing exercise enjoyment. This research has typically prescribed the exercise intensity and used one exercise mode. The aim of this study was to compare self-selected exercise intensity on a cycle ergometer with and without exergaming modes activated. A total of 20 participants aged between 18-40 years (M = 24.2 ± 5.9) completed a sub-maximal exercise test. Participants returned two days later to complete one 45 minute session of self-selected exercise with 15 minutes in each of 'control' (standard ergometer), 'track', and 'game' modes, with order randomized...
2017: PloS One
https://www.readbyqxmd.com/read/29040646/statins-affect-skeletal-muscle-performance-evidence-for-disturbances-in-energy-metabolism
#15
Neeltje A E Allard, Tom J J Schirris, Rebecca J Verheggen, Frans G M Russel, Richard J Rodenburg, Jan A M Smeitink, Paul D Thompson, Maria T E Hopman, Silvie Timmers
Context: Statin myopathy is linked to disturbances in mitochondrial function and exercise intolerance. Objectives: To determine whether differences exist in exercise performance, muscle function and mitochondrial oxidative capacity and content between symptomatic and asymptomatic statin users, and non-statin using controls. Design: Cross-sectional study. Setting: Department of Physiology of the Radboud University Medical Center...
October 9, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29036765/development-of-an-anaerobic-threshold-hrlt-hrvt-estimation-equation-using-the-heart-rate-threshold-hrt-during-the-treadmill-incremental-exercise-test
#16
Joo-Ho Ham, Hun-Young Park, Youn-Ho Kim, Sang-Kon Bae, Byung-Hoon Ko, Sang-Seok Nam
PURPOSE: The purpose of this study was to develop a regression model to estimate the heart rate at the lactate threshold (HRLT) and the heart rate at the ventilatory threshold (HRVT) using the heart rate threshold (HRT), and to test the validity of the regression model. METHODS: We performed a graded exercise test with a treadmill in 220 normal individuals (men: 112, women: 108) aged 20-59 years. HRT, HRLT, and HRVT were measured in all subjects. A regression model was developed to estimate HRLT and HRVT using HRT with 70% of the data (men: 79, women: 76) through randomization (7:3), with the Bernoulli trial...
September 30, 2017: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/29029283/trajectories-of-cardiorespiratory-fitness-in-patients-with-juvenile-dermatomyositis
#17
Kiki J Blom, Tim Takken, Barbara C H Huijgen, Judith Wienke, Annet van Royen-Kerkhof, Marco van Brussel
Objectives: Previous research demonstrated decreased cardiorespiratory fitness (CRF) in patients with JDM during active disease and remission. However, longitudinal data regarding trajectories of CRF are currently lacking. The objective of this study was to determine trajectories of CRF in patients with both monocyclic and chronic JDM, and to identify potential predictors of these trajectories. Methods: Thirty-six patients with JDM [median age (interquartile range) at diagnosis: 8...
September 27, 2017: Rheumatology
https://www.readbyqxmd.com/read/29025898/aging-is-associated-with-increased-propensity-for-central-apnea-during-nrem-sleep
#18
Susmita Chowdhuri, Sukanya Pranathiageswaran, Hillary Loomis-King, Anan Salloum, M Safwan Badr
The reason for increased sleep disordered breathing with predominance of central apneas in the elderly is unknown. We hypothesized that the propensity to central apneas is increased in older adults, manifested by a reduced carbon-dioxide (CO2) reserve in older compared to young adults during non-REM (NREM) sleep. METHODS: 10 elderly and 15 young healthy adults underwent multiple brief trials of nasal noninvasive positive pressure ventilation during stable NREM sleep. Cessation of mechanical ventilation (MV) resulted in hypocapnic central apnea or hypopnea...
October 12, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29018361/new-methods-for-processing-and-quantifying-vo2-kinetics-to-steady-state-vo2-onset-kinetics
#19
Craig R McNulty, Robert A Robergs
Current methods of oxygen uptake (VO2) kinetics data handling may be too simplistic for the complex physiology involved in the underlying physiological processes. Therefore, the aim of this study was to quantify the VO2 kinetics to steady state across the full range of sub-ventilatory threshold work rates, with a particular focus on the VO2 onset kinetics. Ten healthy, moderately trained males participated in five bouts of cycling. Each bout involved 10 min at a percentage of the subject's ventilation threshold (30, 45, 60, 75, 90%) from unloaded cycling...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28992936/-short-term-exercise-based-cardiac-rehabilitation-induced-changes-in-cardiorespiratory-mechanical-and-neuromuscular-responses-to-progressive-exercise-testing
#20
P-M Leprêtre, M Ghannem, S Delanaud, N Jaunet, L Gaillard, A Barnabé, T Porcher, T Weissland
Previous studies showed that changes in peak of oxygen uptake value (VO2peak) with training were poorly related to changes in Maximal Tolerated Power output (MTP) among patients with cardiovascular disease. This result could be due to a difference between cardiopulmonary adaptation to training and the skeletal muscle conditioning. OBJECTIVE: The aim of the study was to compare the responses to exercise training of electromyographic activities of vastus lateralis (rms-EMG) and respiratory parameters...
November 2017: Annales de Cardiologie et D'angéiologie
keyword
keyword
2641
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"