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heart rate variability and exercise

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https://www.readbyqxmd.com/read/29222074/changes-of-oxygen-consumption-and-heart-rate-after-acute-myocardial-infarction-during-6-month-follow-up
#1
Yuri Choe, Jae-Young Han, In-Sung Choi, Hyeng-Kyu Park
BACKGROUND: Exercise intensity is a particularly important determinant of physiological responses to exercise training in patients with acute myocardial infarction. Heart rate (HR) is commonly used as a practical way of prescribing and monitoring exercise as specific intensities based on linear relationship between the percentage of maximum heart rate (%HRmax) and the percentage of maximum oxygen consumption (%VO2max) regardless of age, sex or exercise mode. OBJECTIVE: To examine the change in variability in the correlation between %HRmax and %VO2maxafter acute myocardial infarction...
December 5, 2017: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29220206/aerobic-training-but-no-resistance-training-increases-sirt3-in-skeletal-muscle-of-sedentary-obese-male-adolescents
#2
Katya Vargas-Ortiz, Victoriano Pérez-Vázquez, Arturo Figueroa, Francisco J Díaz, Paulina G Montaño-Ascencio, Maciste H Macías-Cervantes
In recent years, prevalence of obesity in children and adolescents has increased. A strategy for prevention and management of obesity is aerobic training (AT) due to its effectiveness to decrease fat mass. AT increases the content of SIRT3, a mitochondrial protein that increases the expression of PGC-1α and NFR1, thereby enhances mitochondrial function and metabolic health. Resistance training (RT) provides metabolic benefits but its effect on SIRT3 content is unknown. To compare the effect of AT and RT on SIRT3, PGC-1α and NRF-1 protein levels in skeletal muscle of sedentary obese adolescents...
December 8, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29215144/physiological-coherence-in-healthy-volunteers-during-laboratory-induced-stress-and-controlled-breathing
#3
Elisa Mejía-Mejía, Robinson Torres, Diana Restrepo
Physiological coherence has been related with a general sense of well-being and improvements in health and physical, social, and cognitive performance. The aim of this study was to evaluate the relationship between acute stress, controlled breathing, and physiological coherence, and the degree of body systems synchronization during a coherence-generation exercise. Thirty-four university employees were evaluated during a 20-min test consisting of four stages of 5-min duration each, during which basal measurements were obtained (Stage 1), acute stress was induced using validated mental stressors (Stroop test and mental arithmetic task, during Stage 2 and 3, respectively), and coherence states were generated using a controlled breathing technique (Stage 4)...
December 7, 2017: Psychophysiology
https://www.readbyqxmd.com/read/29210954/examining-the-influence-of-exercise-intensity-and-hydration-on-gastrointestinal-temperature-in-collegiate-football-players
#4
Julie K DeMartini-Nolan, Jessica L Martschinske, Douglas J Casa, Rebecca M Lopez, Rebecca L Stearns, Matthew S Ganio, Eric Coris
Debate exists regarding the influence of intensity and hydration on body temperature during American football. The purpose of this study was to observe body core temperature responses with changes in intensity and hydration. Twenty-nine male football players (age=21±1y, height=187±9 cm, mass=110.1±23.5 kg, body mass index (BMI)=31.3±5.0, and body surface area (BSA)=2.34±0.27m2) participated in eight days of practice in a warm environment (WBGT:29.6±1.6°C). Participants were identified as Starters (S;n=12) or Non-Starters (NS;n=17) and Linemen (L;n=14) or Non-Linemen (NL;n=15)...
November 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29206785/three-weeks-of-overload-training-increases-resting-muscle-sympathetic-activity
#5
Alexandra M Coates, Anthony V Incognito, Jeremy D Seed, Connor J Doherty, Philip J Millar, Jamie F Burr
PURPOSE: Overload training is hypothesized to alter autonomic regulation, though interpretations using indirect measures of heart rate variability are conflicting. The aim of the present study was to examine the effects of overload training on muscle sympathetic nerve activity (MSNA), a direct measure of central sympathetic outflow, in recreational endurance athletes. METHODS: Measurements of heart rate variability, cardiac baroreflex sensitivity (BRS), MSNA (microneurography), and sympathetic BRS were obtained in seventeen healthy triathletes and cyclists after 1-week of reduced training (baseline) and following 3-weeks of either regular (CON, n=7) or overload (OL, n=10) training...
December 2, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29190852/exercise-prescription-using-the-borg-rating-of-perceived-exertion-to-improve-fitness
#6
Manuel Vicente Garnacho-Castaño, Raúl Domínguez, Arturo Muñoz González, Raquel Feliu-Ruano, Noemí Serra-Payá, José Luis Maté-Muñoz
The present study aimed to compare two fitness-training methodologies, instability circuit resistance training (ICRT) versus traditional circuit resistance training (TCRT), applying an experimental model of exercise prescription controlling and modulating exercise load using the Borg rating of perceived exertion. Forty-four healthy young adults age (21.6±2.3 years) were randomly assigned to three groups: TCRT (n=14), ICRT (n=14) and a control group (n=16). Strength and cardiorespiratory tests were chosen to evaluate cardiorespiratory and muscular fitness before and after the training program...
November 30, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29185161/exercise-therapy-and-autonomic-function-in-heart-failure-patients-a-systematic-review-and-meta-analysis
#7
REVIEW
M J Pearson, N A Smart
A large body of evidence exists indicating that autonomic imbalance is characteristic of heart failure, with several parameters of autonomic function associated with adverse clinical outcomes. The aim of this systematic review and meta-analysis was to investigate the effects of exercise training on parameters of autonomic function in patients with heart failure and where possible quantify the size of the effect. We conducted database searches (PubMed, EMBASE and Cochrane Trials Register to 31 March 2017) for exercise-based rehabilitation trials in heart failure; using search terms, exercise training, autonomic function, heart rate recovery, heart rate variability and muscle sympathetic nerve activity...
November 29, 2017: Heart Failure Reviews
https://www.readbyqxmd.com/read/29182394/effects-of-intravenous-administration-of-lidocaine-and-buprenorphine-on-gastrointestinal-tract-motility-and-signs-of-pain-in-new-zealand-white-rabbits-after-ovariohysterectomy
#8
Rodney W Schnellbacher, Stephen J Divers, Jessica R Comolli, Hugues Beaufrère, Christina H Maglaras, Natalia Andrade, Laura A Barbur, Desiree D Rosselli, Marko Stejskal, Michele Barletta, Jörg Mayer, Paula Rodriguez, Jane E Quandt
OBJECTIVE To compare analgesic and gastrointestinal effects of lidocaine and buprenorphine administered to rabbits undergoing ovariohysterectomy. ANIMALS Fourteen 12-month-old female New Zealand White rabbits. PROCEDURES Rabbits were assigned to 2 treatment groups (7 rabbits/group). One group received buprenorphine (0.06 mg/kg, IV, q 8 h for 2 days), and the other received lidocaine (continuous rate infusion [CRI] at 100 μg/kg/min for 2 days). Variables, including food and water consumption, fecal output, glucose and cortisol concentrations, and behaviors while in exercise pens, were recorded...
December 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/29177980/cardiac-autonomic-responses-and-number-of-repetitions-maximum-after-led-irradiation-in-the-ipsilateral-and-contralateral-lower-limb
#9
Adalberto Ferreira Junior, Julio Cezar Schamne, Solange Marta Franzói de Moraes, Nilo Massaru Okuno
The aim of this study was to verify the maximum number of repetitions, fatigue index, blood lactate concentration ([Lac]), and cardiac autonomic responses after LED irradiation (LEDI) in the ipsilateral and contralateral limb. Twelve male subjects (22.0 ± 3.86 years; weight 82.94 ± 12.58 kg; height 1.77 ± 0.05 m), physically active, took part in this study. The subjects underwent a one repetition maximum (1RM) test and performed four randomly experimental sessions in the horizontal leg press exercise, which consisted in four sets of maximum repetitions at 80% of 1RM...
November 24, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29176384/the-use-of-mobile-applications-to-collect-data-in-sport-health-and-exercise-science-a-narrative-review
#10
Daniel J Peart, Carlos Balsalobre-Fernández, Matthew P Shaw
Mobile devices are ubiquitous in the population, and most have the capacity to download applications (apps). Some apps have been developed to collect physiological, kinanthropometric and performance data, however the validity and reliability of such data is often unknown. An appraisal of such apps is warranted as mobile apps may offer an alternative method of data collection for practitioners and athletes with money, time and space constraints. This article identifies and critically reviews the commercially available apps that have been tested in the scientific literature, finding evidence to support the measurement of resting heart through photoplethysmograpy, heart rate variability, range of motion, barbell velocity, vertical jump, mechanical variables during running, and distances covered during walking, jogging and running...
November 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29173604/the-impact-of-burst-exercise-on-cardiometabolic-status-of-patients-newly-diagnosed-with-type-2-diabetes
#11
Avinash Pandey, Neville Suskin, Paul Poirier
BACKGROUND: The impact of burst high-intensity exercise on physiological, cardiometabolic, and biochemical variables compared with traditional moderate-intensity continuous exercise training (MICT) has yet to be assessed in patients with type 2 diabetes (T2D). We compared the impact of multiple short-duration, high-intensity burst exercise sessions to MICT on cardiometabolic variables in patients with T2D. METHODS: Forty newly diagnosed patients with T2D not receiving lipid lowering or hypoglycemic medications were randomized to 40 minutes of MICT (60% of maximal heart rate) 5 days per week or 3 continuous bursts of 12 minutes of high-intensity exercise (85% of maximal heart rate) 5 days per week for 3 months...
December 2017: Canadian Journal of Cardiology
https://www.readbyqxmd.com/read/29166320/exercise-alters-gut-microbiota-composition-and-function-in-lean-and-obese-humans
#12
Jacob M Allen, Lucy J Mailing, Grace M Niemiro, Rachel Moore, Mark D Cook, Bryan A White, Hannah D Holscher, Jeffrey A Woods
PURPOSE: Exercise is associated with altered gut microbial composition, but studies have not investigated whether the gut microbiota and associated metabolites are modulated by exercise training in humans. We explored the impact of six weeks of endurance exercise on the composition, functional capacity, and metabolic output of the gut microbiota in lean and obese adults with multiple-day dietary controls prior to outcome variable collection. METHODS: Thirty-two lean (n=18 [9 female]) and obese (n=14 [11 female]), previously sedentary subjects participated in six weeks of supervised, endurance-based exercise training (3 days/wk) that progressed from 30 to 60 minutes/day and from moderate (60% of heart rate reserve [HRR]) to vigorous intensity (75% HRR)...
November 20, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29163192/cycling-before-and-after-exhaustion-differently-affects-cardiac-autonomic-control-during-heart-rate-matched-exercise
#13
Matthias Weippert, Martin Behrens, Anett Mau-Moeller, Sven Bruhn, Kristin Behrens
During cycling before (PRE) and after exhaustion (POST) different modes of autonomic cardiac control might occur due to different interoceptive input and altered influences from higher brain centers. We hypothesized that heart rate variability (HRV) is significantly affected by an interaction of the experimental period (PRE vs. POST) and exercise intensity (HIGH vs. LOW; HIGH = HR > HR at the lactate threshold (HRLT), LOW = HR ≤ HRLT) despite identical average HR. Methods: Fifty healthy volunteers completed an incremental cycling test until exhaustion...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29161745/resting-autonomic-function-in-active-and-insufficiently-active-people-living-with-hiv
#14
Norberto Quiles, Carol Garber, Joseph Ciccolo
Autonomic dysfunction appears to be prevalent in people living with HIV/AIDS (PLWHA). However, there are limited data on the resting autonomic responses to exercise in active and insufficiently active PLWHA. We aimed to determine whether active PLWHA have better autonomic responses compared with insufficiently active PLWHA. Active PLWHA receiving anti-retroviral therapy (n=13) and insufficiently active PLWHA (n=10) were recruited. A 10-min recording of the supine electrocardiogram was taken. Resting heart rate variability was analyzed from this electrocardiogram...
November 21, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29154420/relationship-between-skeletal-muscle-mass-and-cardiac-function-during-exercise-in-community-dwelling-older-adults
#15
Masamitsu Sugie, Kazumasa Harada, Tetsuya Takahashi, Marina Nara, Joji Ishikawa, Teruyuki Koyama, Hunkyung Kim, Jun Tanaka, Hajime Fujimoto, Shuichi Obuchi, Stephan von Haehling, Syunei Kyo, Hideki Ito
AIMS: This study aimed to investigate the relationship between skeletal muscle mass and cardiac functional parameters in older adults during cardiopulmonary exercise testing (CPET). METHODS AND RESULTS: Sixty-three Japanese community-dwelling older adults were enrolled (20 men and 43 women; mean age 80 years, range 65-97 years). Cardiac functional parameters during exercise were assessed using CPET. Skeletal muscle mass index (SMI) was calculated by dividing the appendicular lean mass (measured using dual-energy X-ray absorptiometry) by height in metres squared...
November 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/29143123/recovery-of-the-cardiac-autonomic-nervous-and-vascular-system-after-maximal-cardiopulmonary-exercise-testing-in-recreational-athletes
#16
Heidi Weberruss, Johannes Maucher, Renate Oberhoffer, Jan Müller
OBJECTIVE: The body's adaptation to physical exercise is modulated by sympathetic and parasympathetic (vagal) branches of the autonomic nervous system (ANS). Heart rate variability (HRV), the beat-to-beat variation of the heart, is a proxy measure for ANS activity, whereas blood pressure (BP) is an indicator for cardiovascular function. Impaired vagal activity and lower BP is already described after exercise. However, inconsistent results exist about how long vagal recovery takes and how long post-exercise hypotension persists...
November 15, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29135601/sex-differences-in-cardiac-baroreflex-sensitivity-following-isometric-handgrip-exercise
#17
André L Teixeira, Raphael Ritti-Dias, Diego Antonino, Martim Bottaro, Philip J Millar, Lauro C Vianna
PURPOSE: To investigate potential sex-related differences on spontaneous cardiac baroreflex sensitivity (cBRS) following acute isometric handgrip (IHG) exercise. METHODS: Twenty men (23±3 years) and 20 women (24±4 years) randomly performed four sets of 2-min IHG exercise (two sets for each limb) at 30% maximum voluntary contraction (MVC - experimental) or 3% MVC (sham). Beat-to-beat heart rate (HR) and arterial blood pressure (BP) were monitored using finger photoplethysmography before and 10-, 20-, and 30-min following IHG...
November 13, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29128939/ultra-shortened-time-domain-hrv-parameters-at-rest-and-following-exercise-in-athletes-an-alternative-to-frequency-computation-of-sympathovagal-balance
#18
Michael R Esco, Henry N Williford, Andrew A Flatt, Todd J Freeborn, Fabio Y Nakamura
PURPOSE: The primary purpose of this study was to determine the accuracy of the standard deviation of normal-to-normal intervals (SDNN) to root mean square of successive normal-to-normal interval differences (RMSSD) ratio from 1-min recordings (SDNN:RMSSD1-min) compared to criterion recordings, as well as its relationship to low-frequency-to-high-frequency ratio (LF:HF) at rest and following maximal exercise in a group of collegiate athletes. METHOD: Twenty athletes participated in the study...
November 11, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29127509/heart-rate-variability-and-plasma-nephrines-in-the-evaluation-of-heat-acclimatisation-status
#19
Major Michael John Stacey, S K Delves, D R Woods, S E Britland, L Macconnachie, A J Allsopp, S J Brett, J L Fallowfield, C J Boos
PURPOSE: Heat adaptation (HA) is critical to performance and health in a hot environment. Transition from short-term heat acclimatisation (STHA) to long-term heat acclimatisation (LTHA) is characterised by decreased autonomic disturbance and increased protection from thermal injury. A standard heat tolerance test (HTT) is recommended for validating exercise performance status, but any role in distinguishing STHA from LTHA is unreported. The aims of this study were to (1) define performance status by serial HTT during structured natural HA, (2) evaluate surrogate markers of autonomic activation, including heart rate variability (HRV), in relation to HA status...
November 10, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29122951/dive-heart-rate-in-harbour-porpoises-is-influenced-by-exercise-and-expectations
#20
Birgitte I McDonald, Mark Johnson, Peter T Madsen
The dive response, a decrease in heart rate (ƒH) and peripheral vasoconstriction, is the key mechanism allowing breath-hold divers to perform long duration dives. This pronounced cardiovascular response to diving has been investigated intensely in pinnipeds, but comparatively little is known for cetaceans, in particular in ecologically relevant settings. Here we studied the dive ƒH response in one the smallest cetaceans, the harbour porpoise (Phocoena phocoena). We used a novel multi-sensor data logger to record dive behaviour, ƒH, ventilations and feeding events in three trained porpoises, providing the first evaluation of cetacean ƒH regulation while performing a variety of natural behaviours, including prey capture...
November 9, 2017: Journal of Experimental Biology
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