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heart rate recovery

Alexa M Bouts, Lauren Brackman, Elizabeth Martin, Adam M Subasic, Edward S Potkanowicz
People use their smartphones for everything from web browsing to tracking fitness metrics. However, it is unclear whether smartphone-based apps that use photoplethysmography to measure heart rate are an accurate or valid measure of exercise intensity. Purpose was to determine the accuracy and validity of two iOS-based heart rate monitors, Runtastic Heart Rate Monitor and Pulse Tracker PRO by Runtastic (Runtastic) and Instant Heart Rate+: Heart Rate and Pulse Monitor by Azumio (Instant Heart Rate), when compared to the electrocardiogram (ECG) and Polar® T31 uncoded heart rate monitor from moderate to vigorous intensity exercise...
2018: International Journal of Exercise Science
Nicholas T Bacon, Greg A Ryan, Jonathan E Wingo, Mark T Richardson, Tracey Pangallo, Phillip A Bishop
The purpose was to determine if pull-up performance was affected by the use of chalk (100% magnesium carbonate) during open-handed and pinch grip weight-assisted pull-ups (WAPU) in recreationally-trained rock climbers. Furthermore, the reliability of open-handed and pinch grip WAPU was also investigated. Recreationally-active volunteers (n = 9) completed six counterbalanced trials. Participants used chalk during four trials to determine the reliability (test-retest) of the open-handed and pinch grips. While two of the six trials were used to determine if open-handed and pinch grip WAPU performance was affected without using chalk...
2018: International Journal of Exercise Science
Nur S Ibrahim, Chee K Chen, Ayunizma Ayub, Ayu S Muhamad
Introduction: Lysozyme is one of the salivary antimicrobial proteins which act as the "first line of defence" at the mucosal surface. The effects of prolonged exercise in the hot and cool environments among recreational athletes on salivary lysozyme responses are very limited in the literature, especially in the Asian countries. Objective: To determine the effects of prolonged running in the hot and cool environments on selected physiological parameters and salivary lysozyme responses among recreational athletes...
December 2017: Journal of Exercise Science and Fitness
Feifei Li, Longyan Yi, Huiping Yan, Xuejing Wang, Jinlei Nie, Haifeng Zhang, Frank Hoo Kin Fu, Yanpeng Zang, Shuo Yang, Yifan Lu
Objective: The purpose of this study was to investigate the effects of a single bout of high-intensity interval exercise (HIIE) on high-sensitivity cardiac troponin T (hs-cTnT) release and to explore the potential influencing factors. Methods: Twenty-one experienced marathon runners completed HIIE on treadmill. Each bout of HIIE included a hard run (15.8 ± 1.3 km·h-1 ) at 90% vVO2max for 2 min followed by an easy run (8.8 ± 0.7 km·h-1 ) at 50% vVO2max for 2 min performed 23 times within 92 min...
December 2017: Journal of Exercise Science and Fitness
Jessica N R Peoples, Timmi Maxmillian, Quynh Le, Sergiy M Nadtochiy, Paul S Brookes, George A Porter, Victor L Davidson, Steven N Ebert
Cardiac energy demands during early embryonic periods are sufficiently met through glycolysis, but as development proceeds, oxidative phosphorylation in mitochondria becomes increasingly vital. Adrenergic hormones are known to stimulate metabolism in adult mammals and are essential for embryonic development, but relatively little is known about their effects on metabolism in the embryonic heart.  Here, we show that embryos lacking adrenergic stimulation have approximately 10-fold less cardiac ATP compared to littermate controls...
March 14, 2018: Journal of Biological Chemistry
Heidi J Reich, Lawrence S C Czer, Danny Ramzy, Francisco Arabia, Jaime Moriguchi, Deborah D Ascheim, Timothy D Henry
The use of stem cell therapy in combination with a left ventricular assist device (LVAD) for patients with advanced heart failure (HF) is an attractive concept with the potential to alter the natural history of HF. Cell therapy trials for HF have demonstrated excellent safety and encouraging results, but current rates of myocardial recovery after LVAD implantation are limited. Early trials combining these 2 therapies to increase the likelihood of recovery and to potentially obviate the need for subsequent transplantation appear promising...
March 13, 2018: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
Dayanne S Lima-Borges, Paula F Martinez, Luiz Carlos M Vanderlei, Fernando S S Barbosa, Silvio A Oliveira-Junior
OBJECTIVES: Young athletes' participation in competitive sports is becoming increasingly common, and this increased involvement raises concerns about the occurrence of overtraining and sports injuries. Since these issues are poorly understood, this study analyzed heart rate variability, stress/recovery relationship, and sports injury incidence during a training macrocycle of young sprint and endurance swimmers. METHODS: Thirty teenage swimmers (aged 12 to 17 years) were divided into two groups as follows: Sprint (n=17) and Endurance (n=13)...
March 14, 2018: Physician and Sportsmedicine
Masao Takahashi, Nicolas Badenco, Jacques Monteau, Estelle Gandjbakhch, Fabrice Extramiana, Marina Urena, Nicole Karam, Eloi Marijon, Vincent Algalarrondo, Emmanuel Teiger, Nicolas Lellouche
OBJECTIVES: This study aimed to assess the impact of pacemaker mode programming on clinical outcomes in patients with high-degree atrioventricular conduction disturbance (AVCD) after transcatheter aortic valve implantation (TAVI). BACKGROUND: Although high-degree AVCD after TAVI can receive pacemaker, recovery of the AVCD is often observed. Specific pacemaker algorithms (AAI-DDD mode switch) are available which favor spontaneous atrioventricular conduction. METHODS: Of 1,621 consecutive multi-center TAVI patients, 269 (16...
March 14, 2018: Catheterization and Cardiovascular Interventions
Elif Doğan Baki, Şahin Ulu, Ahmet Yüksek, Hüseyin Arıcan, Remziye Sivaci
OBJECTIVE: The aim of this study was to investigate the effect of listening to music on the consumption of an anesthetic agent as well as postoperative recovery and pain in children undergoing elective tonsillectomy. MATERIALS AND METHODS: Fifty patients were randomized into those to whom music was played during surgery (Group M) and a control group to whom music was not played (Group C). The depth of anesthesia was provided by entropy levels of 50 ± 5 in both groups...
March 12, 2018: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
Sourabh Aggarwal, Feng Xie, Robin High, Gregory Pavlides, Thomas R Porter
BACKGROUND: Although microvascular flow abnormalities have been observed following epicardial recanalization in acute ST-segment elevation myocardial infarction (STEMI), the prevalence and severity of these abnormalities in the current era of rapid percutaneous coronary intervention (PCI) has not been evaluated. The objective of this study was to assess microvascular perfusion (MVP) following successful primary PCI in patients with STEMI and how it affects clinical outcome. METHODS: In this single-center, retrospective study, 170 patients who successfully underwent emergent PCI for STEMI were assessed using real-time myocardial contrast echocardiography using a continuous infusion of intravenous commercial microbubbles (3% Definity)...
March 7, 2018: Journal of the American Society of Echocardiography
I J Jun, J Jun, E M Kim, K Y Lee, N Kim, M H Chung, Y R Choi, E M Choi
BACKGROUND: This study set out to compare the onset and duration of rocuronium-induced neuromuscular blockade in second trimester pregnant women and non-pregnant women receiving general anesthesia. METHODS: Forty-seven pregnant (Group P) and forty-seven non-pregnant (Group C) women were enrolled. Anesthesia was induced with propofol 2.0 mg/kg and rocuronium 0.6 mg/kg, and neuromuscular blockade was assessed with an accelerometric sensor using train-of-four stimulation (TOF-Watch® SX)...
March 5, 2018: International Journal of Obstetric Anesthesia
Carlos D Davila, James E Udelson
Among all patients referred for stress myocardial perfusion imaging (MPI), a substantial proportion in contemporary practice cannot exercise. Another group of patients are those who are thought to be able to achieve an adequate workload with treadmill (or bicycle) exercise but do not achieve at least 85% of maximum predicted heart rate without developing symptoms. There has been substantial interest and literature on the adjunctive use of vasodilator stress during the same visit to generate best-quality results for patients who do not exercise adequately...
March 2018: JACC. Cardiovascular Imaging
S Perez-Protto, R Nazemian, M Matta, P Patel, K J Wagner, S Q Latifi, D J Lebovitz, J D Reynolds
Many deceased by neurologic criteria donors are administered inhalational agents during organ recovery surgery-a process that is characterised by warm and cold ischaemia followed by warm reperfusion. In certain settings, volatile anaesthetics (VA) are known to precondition organs to protect them from subsequent ischaemia-reperfusion injury. As such, we hypothesised that exposure to VA during organ procurement would improve post-graft survival. Lifebanc (organ procurement organisation [OPO] for NE Ohio) provided the investigators with a list of death by neurologic criteria organ donors cared for at three large tertiary hospitals in Cleveland between 2006 and 2016-details about the surgical recovery phase were extracted from the organ donors' medical records...
March 2018: Anaesthesia and Intensive Care
Rolf-Arne Ølberg, Melissa Sinclair, Ian K Barker, Graham Crawshaw
The combination of fentanyl and midazolam is commonly used as a sedative in humans. The objective of this study was to evaluate the sedative properties and physiological effects of fentanyl-midazolam and fentanyl-midazolam-ketamine compared with medetomidine-ketamine given intramuscularly in Japanese macaques ( Macaca fuscata). In a randomized crossover design, eight Japanese macaques were hand-injected with either 30 μg/kg fentanyl + 0.3 mg/kg midazolam (FM), 15 μg/kg fentanyl + 0.3 mg/kg midazolam + 5.0 mg/kg ketamine (FMK), or 0...
March 2018: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
Michal Hulman, Panagiotis Artemiou, Matej Ondrusek, Vladan Hudec, Ivo Gasparovic, Martin Bena, Ivan Glonek
OBJECTIVES: Primary graft dysfunction (PGD) is a devastating complication and the most common cause of early death following a heart transplant. The goal of this study was to report our experience of using mechanical circulatory support to manage severe PGD. METHODS: Following 208 heart transplants performed between January 2007 and May 2017, 14 (6.7%) patients presented with severe PGD. We provided haemodynamic support using the following approaches: a venoarterial extracorporeal membrane oxygenation device, left ventricular assist device, right ventricular assist device and biventricular assist device...
March 5, 2018: Interactive Cardiovascular and Thoracic Surgery
Ali Valika, Kim Paprockas, Dana Villines, Maria Rosa Costanzo
BACKGROUND: Left ventricular ejection fraction (LVEF) has shown to predict outcomes in patients with heart failure (HF). Left ventricular recovery (LVR) has shown to improve prognosis. HYPOTHESIS: Guideline directed medical therapy (GDMT) will predict LVR in patients with HF and reduced EF. METHODS: 244 patients with newly diagnosed HF and a LVEF ≤ 35% were studied. LVR was defined as an increase in LVEF ≥ 40%. Patients who experienced LVR were compared to those who had persistent left ventricular dysfunction (LVD)...
March 7, 2018: Clinical Cardiology
Andrea Hepuapo'okela Hermosura, Stephen N Haynes, Joseph Keawe'aimoku Kaholokula
Native Hawaiians, compared to other ethnic groups in Hawai'i, have significantly higher mortality rates and die at a younger average age from cardiovascular disease (CVD). This may be partially explained by elevated cardiovascular responses to racial stressors. Our study examined the degree to which blood pressure (BP) and heart rate (HR) reactivity and recovery, and ratings of subjective distress to racial stressors, differ as a function of Native Hawaiian college students' levels of perceived racism. This study had three phases...
March 6, 2018: Journal of Racial and Ethnic Health Disparities
Emi Yuda, Yoshifumi Moriyama, Toshihiko Mori, Yutaka Yoshida, Makoto Kawahara, Junichiro Hayano
Nocturnal heart rate variability (HRV) is thought to reflect healthy recovery function of the autonomic nervous system. Although exercise is recommended for health promotion, exercise itself decreases HRV. We studied acute effect of daytime exercise on nocturnal HRV in 5 healthy adults (age, 22-40 years; 2 female subjects) without regular exercise habit. Using a treadmill, they performed 30-min walking at 4 km/hr and 30-min running at 9 km/hr from 11 a.m. on different days at an interval of 2 weeks. On these days and a day without exercise (control), Holter electrocardiograms were recorded from 9 a...
February 2018: Journal of Exercise Rehabilitation
Shashikant L Sholapurkar
The survival of cardiotocography (CTG) as a tool for intrapartum fetal monitoring seems threatened somewhat unjustifiably and unwittingly despite the absence of better alternatives. Fetal heart rate (FHR) decelerations are center-stage (most important) in the interpretation of CTG with maximum impact on three-tier classification. The pattern-discrimination of FHR decelerations is inexorably linked to their nomenclature. Unscientific or flawed nomenclature of decelerations can explain the dysfunctional CTG interpretation leading to errors in detection of acidemic fetuses...
April 2018: Journal of Clinical Medicine Research
Hannah J Whittington, Philip J Ostrowski, Debra J McAndrew, Fang Cao, Andrew Shaw, Thomas R Eykyn, Hannah Lake, Jack Tyler, Jurgen E Schneider, Stefan Neubauer, Sevasti Zervou, Craig A Lygate
Aims: Mitochondrial creatine kinase (MtCK) couples ATP production via oxidative phosphorylation to phosphocreatine in the cytosol, which acts as a mobile energy store available for regeneration of ATP at times of high demand. We hypothesised that elevating MtCK would be beneficial in ischaemia-reperfusion (I/R) injury. Methods and Results: Mice were created overexpressing the sarcomeric MtCK gene with αMHC promoter at the Rosa26 locus (MtCK-OE) and compared with wild-type (WT) littermates...
March 2, 2018: Cardiovascular Research
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