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Heart rate variability, training

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https://www.readbyqxmd.com/read/28723813/effect-of-resistance-training-on-blood-pressure-and-autonomic-responses-in-treated-hypertensives
#1
Gabriela Alves Trevizani, Mariana Balbi Seixas, Paulo Roberto Benchimol-Barbosa, Jeferson Macedo Vianna, Lilian Pinto da Silva, Jurandir Nadal
This study evaluated the effect of resistance training (RT) on heart rate variability (HRV) and on blood pressure (BP) responses to acute and short-term exposure in treated hypertensive subjects. Twenty one men participated in the study, eight hypertensive under drug treatment regimen and achieving adequate blood pressure control prior to inclusion (HT) and thirteen normotensive (NT). The RT protocol consisted of 12 sessions with 8 exercises (leg extension, leg press, leg curl, bench press, seated row, triceps push-down, seated calf flexion and seated arm curl) performed for 2 sets of 15-20 repetitions with 50% of one repetition-maximum (1RM) with 2-minute rest intervals in between sets, 3x/week...
July 17, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28717626/muscle-fatigue-in-participants-of-indoor-cycling
#2
Ricardo de Melo Dos Santos, Flavio Costa E Costa, Thais Sepeda Saraiva, Bianca Callegari
BACKGROUND: Indoor Cycling (IC) has been gaining recognition and popularity within recent years and few studies have investigated its benefits for sedentary participants. OBJECTIVE: The aim of this study was to evaluate differences in the surface electromyography (sEMG) variables, heart rate (HR), and subjective effort in sedentary participants while they performed an IC session and to compare their results with the trained subjects, to answer the question: Are trained cyclists less susceptible to muscle fatigue, since it is expected that they make less effort? DESIGN: Twenty-six volunteers were split into two groups according to their fitness status and weekly training load...
January 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28713466/intra-subject-variability-of-5-km-time-trial-performance-completed-by-competitive-trained-runners
#3
James Fisher, Thomas Clark, Katherine Newman-Judd, Josh Arnold, James Steele
Time-trials represent an ecologically valid approach to assessment of endurance performance. Such information is useful in the application of testing protocols and estimation of sample sizes required for research/magnitude based inference methods. The present study aimed to investigate the intra-subject variability of 5 km time-trial running performance in trained runners. Six competitive trained male runners (age = 33.8 ± 10.1 years; stature = 1.78 ± 0.01 m; body mass = 69.0 ± 10.4 kg, [Formula: see text]O2max = 62...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28713463/cardiopulmonary-performance-during-maximal-exercise-in-soccer-players-with-alterations-in-renal-function
#4
Anderson Pontes Morales, Felipe Sampaio-Jorge, Luiz Felipe da Cruz Rangel, Jackson de Souza Menezes, Tiago Costa Leite, Beatriz Gonçalves Ribeiro
The aim of this study was to evaluate the curves of cardiorespiratory variables during cardiopulmonary exercise testing (CPET) in soccer players who had acute alterations in the glomerular filtration rate (GFR) after performing the pre-season training protocol. Sixteen male professional soccer players (25 ± 3 years; 179 ± 2 cm; and 77 ± 6 kg) were evaluated for oxygen uptake (VO2), heart rate (HR) and pulse relative oxygen (relative O2 Pulse) curves with intervals corresponding to 10% of the total duration of CPET...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28712259/four-week-living-high-training-low-program-enhances-3000-m-and-5000-m-time-trials-by-improving-energy-metabolism-during-submaximal-exercise-in-athletes
#5
Hun-Young Park, Sungho Kim, Sang-Seok Nam
PURPOSE: This study aimed to determine the effect of a 4-week living high training low (LHTL) versus a living low training low (LLTL) program on energy metabolism during submaximal exercise and 3000-m and 5000-m time trial (TT) in athletes. METHODS: Male athletes (n = 20) were randomly assigned to the LLTL (n = 10, living at 1000 m and training at 700-1330 m) and LHTL (n = 10, living at simulated 3000 m and training at 700-1330 m) groups. We compared energy metabolisms during submaximal exercise on a treadmill and aerobic exercise performance (3000 m and 5000 m TT) before and after 4 weeks of training...
March 31, 2017: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/28709155/variable-accuracy-of-wearable-heart-rate-monitors-during-aerobic-exercise
#6
Stephen Gillinov, Muhammad Etiwy, Robert Wang, Gordon Blackburn, Dermot Phelan, A Marc Gillinov, Penny Houghtaling, Hoda Javadikasgari, Milind Y Desai
PURPOSE: Athletes and members of the public increasingly rely on wearable HR monitors to guide physical activity and training. The accuracy of newer, optically based monitors is unconfirmed. We sought to assess the accuracy of five optically based HR monitors during various types of aerobic exercise. METHODS: Fifty healthy adult volunteers (mean ± SD age = 38 ± 12 yr, 54% female) completed exercise protocols on a treadmill, a stationary bicycle, and an elliptical trainer (±arm movement)...
August 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28705551/effects-of-progressive-resistance-training-on-cardiovascular-autonomic-regulation-in-patients-with-parkinson-s-disease-a-randomized-controlled-trial
#7
Hélcio Kanegusuku, Carla Silva-Batista, Tiago Peçanha, Alice Nieuwboer, Natan D Silva, Luiz A R Costa, Marco T de Mello, Maria E P Piemonte, Carlos Ugrinowitsch, Cláudia L M Forjaz
OBJECTIVE: To evaluate the effects of a progressive resistance training (RT) on cardiac autonomic modulation and on cardiovascular responses to autonomic stress tests in patients with Parkinson disease (PD). DESIGN: Randomized clinical trial. SETTING: The Brazilian Parkinson Association. PARTICIPANTS: 30 patients with PD (modified Hoehn and Yahr stages 2-3) were randomly divided into 2 groups: a progressive RT group (PDT) and a control group (PDC)...
July 10, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28705170/can-lokomat-therapy-with-children-and-adolescents-be-improved-an-adaptive-clinical-pilot-trial-comparing-guidance-force-path-control-and-freed
#8
Tabea Aurich-Schuler, Fabienne Grob, Hubertus J A van Hedel, Rob Labruyère
BACKGROUND: Robot-assisted gait therapy is increasingly being used in pediatric neurorehabilitation to complement conventional physical therapy. The robotic device applied in this study, the Lokomat (Hocoma AG, Switzerland), uses a position control mode (Guidance Force), where exact positions of the knee and hip joints throughout the gait cycle are stipulated. Such a mode has two disadvantages: Movement variability is restricted, and patients tend to walk passively. Kinematic variability and active participation, however, are crucial for motor learning...
July 14, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28702883/risk-factors-for-recurrent-emergency-department-visits-for-hyperglycemia-in-patients-with-diabetes-mellitus
#9
Justin W Yan, Katherine M Gushulak, Melanie P Columbus, Kristine van Aarsen, Alexandra L Hamelin, George A Wells, Ian G Stiell
BACKGROUND: Patients with poorly controlled diabetes mellitus may present repeatedly to the emergency department (ED) for management and treatment of hyperglycemic episodes, including diabetic ketoacidosis and hyperosmolar hyperglycemic state. The objective of this study was to identify risk factors that predict unplanned recurrent ED visits for hyperglycemia in patients with diabetes within 30 days of initial presentation. METHODS: We conducted a 1-year health records review of patients ≥18 years presenting to one of four tertiary care EDs with a discharge diagnosis of hyperglycemia, diabetic ketoacidosis, or hyperosmolar hyperglycemic state...
December 2017: International Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28690894/gender-differences-in-heart-rate-variability-among-individuals-undergoing-regular-resistance-training-preliminary-observations
#10
Ellen S V Ramalho, Estevam L Souza-Junior, Marciane Magnani, Valdir A Braga
OBJECTIVES: Frequency-domain analysis of heart rate variability (HRV) is an effective tool to evaluate autonomic balance. This study aimed to investigate gender differences in HRV among individuals undergoing regular resistance training. METHODS: This preliminary cross-sectional study was conducted from April to September 2016 in João Pessoa, Paraíba, Brazil. The low-frequency (LF), high-frequency (HF) and LF/HF ratio components of HRV spectral analysis were analysed among 22 men and 27 women undergoing regular resistance training...
May 2017: Sultan Qaboos University Medical Journal
https://www.readbyqxmd.com/read/28679415/classification-of-caesarean-section-and-normal-vaginal-deliveries-using-foetal-heart-rate-signals-and-advanced-machine-learning-algorithms
#11
Paul Fergus, Abir Hussain, Dhiya Al-Jumeily, De-Shuang Huang, Nizar Bouguila
BACKGROUND: Visual inspection of cardiotocography traces by obstetricians and midwives is the gold standard for monitoring the wellbeing of the foetus during antenatal care. However, inter- and intra-observer variability is high with only a 30% positive predictive value for the classification of pathological outcomes. This has a significant negative impact on the perinatal foetus and often results in cardio-pulmonary arrest, brain and vital organ damage, cerebral palsy, hearing, visual and cognitive defects and in severe cases, death...
July 6, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28671554/a-machine-learning-based-analysis-for-the-recognition-of-progressive-central-hypovolemia
#12
Frank Cornelis Bennis, Björn Van der Ster, Johannes Van Lieshout, Peter Andriessen, Tammo Delhaas
Traditional patient monitoring during surgery include heart rate (HR), blood pressure (BP) and peripheral oxygen saturation. However, their use as predictors for central hypovolemia is limited, which may lead to cerebral hypoperfusion. The aim of this study was to develop a monitoring model that can indicate a decrease in central blood volume (CBV) in an early stage. Approach: Twenty-eight healthy subjects (age 18-50 yr) were included. Lower body negative pressure (-50 mmHg) was applied to induce central hypovolemia until onset of pre-syncope...
July 3, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28658719/patient-education-in-the-management-of-coronary-heart-disease
#13
REVIEW
Lindsey Anderson, James Pr Brown, Alexander M Clark, Hasnain Dalal, Henriette K Rossau, Charlene Bridges, Rod S Taylor
BACKGROUND: Coronary heart disease (CHD) is the single most common cause of death globally. However, with falling CHD mortality rates, an increasing number of people live with CHD and may need support to manage their symptoms and improve prognosis. Cardiac rehabilitation is a complex multifaceted intervention which aims to improve the health outcomes of people with CHD. Cardiac rehabilitation consists of three core modalities: education, exercise training and psychological support. This is an update of a Cochrane systematic review previously published in 2011, which aims to investigate the specific impact of the educational component of cardiac rehabilitation...
June 28, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28658078/comparison-of-incremental-intermittent-and-time-trial-testing-in-age-group-swimmers
#14
Rodrigo Zacca, Rui Azevedo, Ricardo Peterson Silveira, João Paulo Vilas-Boas, David B Pyne, Flávio A de S Castro, Ricardo J Fernandes
The aim of this study was to compare physiological and biomechanical characteristics between an incremental intermittent test and a time trial protocol in age-group swimmers. 11 national level age-group swimmers (6 male and 5 female) performed a 7 x 200-m incremental intermittent protocol (until exhaustion; 30 s rest) and a 400-m test (T400) in front crawl on separate days. Cardiorespiratory variables were measured continuously using a telemetric portable gas analyzer. Swimming speed, stroke rate, stroke length and stroke index were assessed by video analysis...
June 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28657825/effectiveness-of-tai-chi-on-cardiac-autonomic-function-and-symptomatology-in-women-with-fibromyalgia-a-randomized-controlled-trial
#15
Alexei Wong, Arturo Figueroa, Marcos A Sanchez-Gonzalez, Won-Mok Son, Oksana Chernykh, Song-Young Park
The present study examined the effects of a 12-week Tai Chi (TC) training regimen on heart rate variability (HRV), symptomatology, muscle fitness and body composition in women with fibromyalgia. Participants were randomly assigned to either a TC training group (n=18) or a control group (n=19). HRV, symptomatology, muscle fitness and body composition were measured before and after 12 weeks. There were significant decreases (P<0.05) in sympathovagal balance (LnLF/LnHF), sympathetic tone (LnLF, nLF), pain, fatigue and significant increases (P<0...
June 28, 2017: Journal of Aging and Physical Activity
https://www.readbyqxmd.com/read/28649873/can-you-snooze-your-way-to-an-a-exploring-the-complex-relationship-between-sleep-autonomic-activity-wellbeing-and-performance-in-medical-students
#16
Erin Cvejic, Shiny Huang, Uté Vollmer-Conna
OBJECTIVE: Medical training brings with it multiple stressors, including demanding workloads in highly competitive environments, with well-documented impact on psychiatric morbidity. This study evaluated the impact of sleep-related factors on psychological wellbeing, cognitive task performance and academic standing in medical students. METHODS: A total of 59 undergraduate medical students took part in this cross-sectional study over two consecutive days. Participants responded to questionnaires about their physical and psychological health, sleep, functioning and academic performance at the initial visit...
June 1, 2017: Australian and New Zealand Journal of Psychiatry
https://www.readbyqxmd.com/read/28649720/in-season-changes-in-heart-rate-recovery-are-inversely-related-to-time-to-exhaustion-but-not-aerobic-capacity-in-rowers
#17
Kristin Haraldsdottir, Stacey Brickson, Jennifer Sanfilippo, Warren Dunn, Andrew Watson
PURPOSE: Determine if in-season changes in heart rate recovery (HRR) are related to aerobic fitness and performance in collegiate rowers. METHODS: 22 female collegiate rowers completed testing before and after their competitive season. Body fat percentage (BF%) was determined by dual-energy x-ray absorptiometry. Maximal aerobic capacity (VO2max ) and time to exhaustion (Tmax ) were determined during maximal rowing ergometer testing followed by 1 minute of recovery...
June 26, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28646812/oral-consumption-of-vitamin-k2-for-8-weeks-associated-with-increased-maximal-cardiac-output-during-exercise
#18
Brian K McFarlin, Andrea L Henning, Adam S Venable
Background • Vitamin K1 and K2 are not typically common in a Western diet because they are found in a variety of fermented foods. Vitamin K2 in particular has been demonstrated to restore mitochondrial function and has a key role in production of mitochondrial adenosine triphosphate. Thus, it is reasonable to speculate that dietary supplementation with vitamin K2 could increase the function of muscle with high mitochondrial content (ie, skeletal and cardiac muscle). Objective • The purpose of this study was to determine if 8 wk of dietary supplementation with Vitamin K2 could alter cardiovascular responses to a graded cycle ergometer test...
July 2017: Alternative Therapies in Health and Medicine
https://www.readbyqxmd.com/read/28640758/consecutive-ultra-short-term-heart-rate-variability-to-track-dynamic-changes-in-autonomic-nervous-system-during-and-after-exercise
#19
Xiang Chen, Ruijie Yao, Gezhen Yin, Jin Li
OBJECTIVE: Quantitative measurement of the dynamic changes in autonomic nervous system (ANS) during and after exercise has great significance in clinical, sports training and other fields. A consecutive ultra-short-term (30 s, UST) heart rate variability (HRV) method was proposed to track the exercise-induced autonomic control of heart rate (HR). APPROACH: Twenty-three healthy young men participated in the study. The first four stages of the Modified Bruce Protocol (S0-S3) were performed...
June 22, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28638349/cardiorespiratory-coordination-in-repeated-maximal-exercise
#20
Sergi Garcia-Retortillo, Casimiro Javierre, Robert Hristovski, Josep L Ventura, Natàlia Balagué
Increases in cardiorespiratory coordination (CRC) after training with no differences in performance and physiological variables have recently been reported using a principal component analysis approach. However, no research has yet evaluated the short-term effects of exercise on CRC. The aim of this study was to delineate the behavior of CRC under different physiological initial conditions produced by repeated maximal exercises. Fifteen participants performed 2 consecutive graded and maximal cycling tests. Test 1 was performed without any previous exercise, and Test 2 6 min after Test 1...
2017: Frontiers in Physiology
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