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Exercise pressor response

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https://www.readbyqxmd.com/read/27849115/blood-pressure-response-to-isometric-handgrip-testing-and-aerobic-capacity-and-associations-with-sprint-performance-in-middle-aged-men-following-high-intensity-interval-training
#1
Ryszard Zarzeczny, Cyprian Tomza, Anna Polak, Agnieszka Nawrat-Szołtysik
BACKGROUND: Of this study were to determine if a 6-week high-intensity interval training (HIIT) protocol with increasing exercise volume affects aerobic capacity and arterial blood pressure (BP) measured during a fatiguing isometric handgrip test (IHT) in middle-aged, normotensive men and to assess whether sprint performance is associated with training-induced changes in BP. METHODS: Fourteen recreationally active men (age 43.0 ± 0.9 years, body mass 74.4 ± 2...
November 16, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27802438/bradykinin-contributes-to-sympathetic-and-pressor-responses-evoked-by-activation-of-skeletal-muscle-afferents-p2x-in-heart-failure
#2
Jihong Xing, Jianhua Li
BACKGROUND/AIMS: Published data suggest that purinergic P2X receptors of muscle afferent nerves contribute to the enhanced sympathetic nervous activity (SNA) and blood pressure (BP) responses during static exercise in heart failure (HF). In this study, we examined engagement of bradykinin (BK) in regulating responses of SNA and BP evoked by P2X stimulation in rats with HF. We further examined cellular mechanisms responsible for BK. We hypothesized that BK potentiates P2X currents of muscle dorsal root ganglion (DRG) neurons, and this effect is greater in HF due to upregulation of BK kinin B2 and P2X3 receptor...
2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27798354/low-frequency-stimulation-of-group-iii-and-iv-hind-limb-afferents-evokes-reflex-pressor-responses-in-decerebrate-rats
#3
Jonathan E Harms, Steven W Copp, Marc P Kaufman
Contraction of freely perfused hind limb muscles in decerebrate rats evokes the exercise pressor reflex, resulting in sympathetic activation and increased blood pressure. This reflex is propagated along mechanically sensitive group III and metabolically sensitive group IV afferent nerve fibers. Recent research by our laboratory has focused on the exaggeration of the exercise pressor reflex in decerebrate rats with simulated peripheral artery disease, which was induced by ligating the femoral artery for 72 h before the start of the experiment...
October 2016: Physiological Reports
https://www.readbyqxmd.com/read/27763873/whole-body-heat-stress-attenuates-the-pressure-response-to-muscle-metaboreceptor-stimulation-in-humans
#4
Jian Cui, Cheryl Blaha, Lawrence I Sinoway
The effects of whole body heat stress on sympathetic and cardiovascular responses to stimulation of muscle metaboreceptors and mechanoreceptors remains unclear. We examined the muscle sympathetic nerve activity (MSNA), blood pressure, and heart rate in 14 young healthy subjects during fatiguing isometric handgrip exercise, postexercise circulatory occlusion (PECO), and passive muscle stretch during PECO. The protocol was performed under normothermic and whole body heat stress (increase internal temperature ~0...
November 1, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27690366/rate-of-rise-in-diastolic-blood-pressure-influences-vascular-sympathetic-response-to-mental-stress
#5
Khadigeh El Sayed, Vaughan G Macefield, Sarah L Hissen, Michael J Joyner, Chloe E Taylor
KEY POINTS: Research indicates that individuals may experience a rise (positive responders) or fall (negative responders) in muscle sympathetic nerve activity (MSNA) during mental stress. In this study, we examined the early blood pressure responses (including the peak, time of peak and rate of rise in blood pressure) to mental stress in positive and negative responders. Negative MSNA responders to mental stress exhibit a more rapid rise in diastolic pressure at the onset of the stressor, suggesting a baroreflex-mediated suppression of MSNA...
September 30, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27614226/interaction-between-the-muscle-metaboreflex-and-the-arterial-baroreflex-in-control-of-arterial-pressure-and-skeletal-muscle-blood-flow
#6
Jasdeep Kaur, Alberto Alvarez, Hanna W Hanna, Abhinav C Krishnan, Danielle Senador, Tiago M Machado, Yasir H Altamimi, Abe T Lovelace, Maryetta D Dombrowski, Marty D Spranger, Donal S O'Leary
The muscle metaboreflex and arterial baroreflex regulate arterial pressure through distinct mechanisms. During submaximal exercise muscle metaboreflex activation (MMA) elicits a pressor response virtually solely by increasing cardiac output (CO) while baroreceptor unloading increases mean arterial pressure (MAP) primarily through peripheral vasoconstriction. The interaction between the two reflexes when activated simultaneously has not been well established. We activated the muscle metaboreflex in chronically instrumented canines during dynamic exercise (via graded reductions in hindlimb blood flow; HLBF) followed by simultaneous baroreceptor unloading (via bilateral carotid occlusion; BCO)...
November 1, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27594392/influence-of-a-high-intensity-interval-training-session-on-peripheral-and-central-blood-pressure-at-rest-and-during-stress-testing-in-healthy-individuals
#7
Sascha Ketelhut, Florian Milatz, Walter Heise, Reinhard G Ketelhut
BACKGROUND: Regular physical activity is known to reduce arterial pressure (BP). In a previous investigation, we could prove that even a single bout of moderate-intensity continuous exercise (MICE) causes a prolonged reduction in BP. Whether high-intensity interval training (HIIT) has a favourable influence on BP, and therefore may be followed subjects and methods by a prolonged BP reduction, should be examined on the basis of blood pressure response after exercise and during a subsequent stress test...
September 2016: VASA. Zeitschrift Für Gefässkrankheiten
https://www.readbyqxmd.com/read/27550055/why-not-to-use-the-handgrip-test-in-the-assessment-of-cardiovascular-autonomic-neuropathy-among-patients-with-diabetes-mellitus
#8
Anna E Körei, Miklós Kempler, Ildikó Istenes, Orsolya E Vági, Zsuzsanna Putz, Viktor J Horváth, Katalin Keresztes, Csaba Lengyel, Ádám Gy Tabák, Vincenza Spallone, Péter Kempler
OBJECTIVE: Historically, a set of 5 cardiovascular autonomic reflex tests (CARTs) was considered to be the gold standard in the assessment of cardiovascular autonomic neuropathy (CAN). However, measuring diastolic blood pressure (BP) response to sustained handgrip is omitted in recent guidelines. We aimed to assess the association between the handgrip and the other 4 tests as well as to identify determinants of the handgrip test results in diabetic patients. PATIENTS AND METHODS: 353 patients with diabetes (DM) were recruited (age: 60...
August 22, 2016: Current Vascular Pharmacology
https://www.readbyqxmd.com/read/27539494/central-command-does-not-suppress-baroreflex-control-of-cardiac-sympathetic-nerve-activity-at-the-onset-of-spontaneous-motor-activity-in-the-decerebrate-cat
#9
Kanji Matsukawa, Kei Ishii, Ryota Asahara, Mitsuhiro Idesako
Our laboratory has reported that central command blunts the sensitivity of aortic baroreceptor-heart rate (HR) reflex at the onset of voluntary static exercise in animals. We have examined whether baroreflex control of cardiac sympathetic nerve activity (CSNA) and/or cardiovagal baroreflex sensitivity are altered at the onset of spontaneously occurring motor behavior, which was monitored with tibial nerve activity in paralyzed, decerebrate cats. CSNA exhibited a peak increase (126 ± 17%) immediately after the exercise onset, followed by increases in HR and mean arterial pressure (MAP)...
August 18, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27526332/preoperative-hypoalgesia-after-cold-pressor-test-and-aerobic-exercise-is-associated-with-pain-relief-six-months-after-total-knee-replacement
#10
Henrik Bjarke Vaegter, Gitte Handberg, Claus Emmeluth, Thomas Graven-Nielsen
OBJECTIVES: Chronic pain after total knee replacement (TKR) is not uncommon. Preoperative impaired conditioning pain modulation (CPM) has been used to predict chronic postoperative pain. Interestingly, exercises reduce pain sensitivity in patients with knee osteoarthritis. This pilot study investigated the association between exercise-induced hypoalgesia (EIH) and CPM on post-TKR pain relief. METHODS: Before and six months post-TKR, 14 patients with chronic knee osteoarthritis performed the cold pressor test on the non-affected leg and two exercise conditions (bicycling and isometric knee extension), randomized and counterbalanced...
August 12, 2016: Clinical Journal of Pain
https://www.readbyqxmd.com/read/27518487/exercise-induced-hypoalgesia-in-people-with-knee-osteoarthritis-with-normal-and-abnormal-conditioned-pain-modulation
#11
Caitriona Fingleton, Keith Smart, Catherine Doody
OBJECTIVES: Normal efficiency of exercise-induced hypoalgesia (EIH) has been demonstrated in people with knee osteoarthritis (OA), while recent evidence suggests that EIH may be associated with features of pain sensitization such as abnormal conditioned pain modulation (CPM). The aim of this study was to investigate whether people with knee OA with abnormal CPM have dysfunctional EIH compared to those with normal CPM and pain-free controls. METHODS: 40 people with knee OA were subdivided into groups with abnormal and normal CPM, as determined by a decrease/increase in pressure pain thresholds (PPTs) following the cold pressor test...
August 11, 2016: Clinical Journal of Pain
https://www.readbyqxmd.com/read/27506589/sympathetic-neural-and-cardiovascular-responses-during-static-handgrip-exercise-in-women-with-a-history-of-hypertensive-pregnancy
#12
Abigail S L Stickford, Yoshiyuki Okada, Stuart A Best, Rosemary S Parker, Benjamin D Levine, Qi Fu
PURPOSE: Women with a history of hypertensive pregnancy are at greater risk for future cardiovascular events; however, the mechanisms for this increased risk are unknown. Evidence suggests that an exercise stimulus unmasks latent hypertensive tendencies, identifying individuals at the greatest risk for developing cardiovascular disease. The current study examined the hypothesis that women with a hypertensive pregnancy history exhibit an augmented exercise pressor response. METHODS: Normotensive women with a history of healthy pregnancy (CON; n = 9) and hypertensive pregnancy (HP+; n = 12) were studied during the mid-luteal phase of the menstrual cycle...
August 9, 2016: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/27454706/increased-conditioned-pain-modulation-in-athletes
#13
Andrew Flood, Gordon Waddington, Kevin Thompson, Stuart Cathcart
The potential relationship between physical activity and endogenous pain modulatory capacity remains unclear. Therefore, the aim of the current study was to compare the pain modulatory responses of athletes and non-athletes. Conditioned pain modulation (CPM) was assessed in 15 athletes and 15 non-athletes at rest. Participation was restricted to pain-free males between 18 and 40 years of age. To measure CPM capacity, a sequential CPM testing protocol was implemented, whereby a test stimulus (pressure pain threshold [PPT]) was presented before and immediately after a conditioning stimulus (4-min cold-pressor test)...
July 25, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27378935/swimming-training-modulates-nitric-oxide-glutamate-interaction-in-the-rostral-ventrolateral-medulla-in-normotensive-conscious-rats
#14
Hiviny de A Raquel, Gustavo S Masson, Barbara Falquetto Barna, Nágela G Zanluqui, Phileno Pinge-Filho, Lisete C Michelini, Marli C Martins-Pinge
We evaluated the effects of swimming training on nitric oxide (NO) modulation to glutamate microinjection within the rostral ventrolateral medulla (RVLM) in conscious freely moving rats. Male Wistar rats were submitted to exercise training (Tr) by swimming or kept sedentary (Sed) for 4 weeks. After the last training session, RVLM guide cannulas and arterial/venous catheters were chronically implanted. Arterial pressure (AP), heart rate (HR), and baroreflex control of HR (loading/unloading of baroreceptors) were recorded in conscious rats at rest...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27360289/generalized-response-of-the-exercise-pressor-reflex-1370-board-23-june-2-8-00-am-9-30-am
#15
Nathan M Garvin, James A Pawelczyk
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27344133/association-of-coronary-microvascular-dysfunction-with-restenosis-of-left-anterior-descending-coronary-artery-disease-treated-by-percutaneous-intervention
#16
Antonio De Vita, Maria Milo, Alfonso Sestito, Priscilla Lamendola, Gaetano A Lanza, Filippo Crea
BACKGROUND: Several patients with successful percutaneous coronary interventions (PCIs) show evidence of coronary microvascular dysfunction (CMVD), which can be responsible for persistent positivity of electrocardiographic exercise stress test (EST). In this study, we assessed whether post-PCI CMVD may predict clinical outcome in patients undergoing successful elective PCI of an isolated stenosis of the left anterior descending (LAD) coronary artery. METHODS: We studied 29 patients (age 64±6, 23 M) with stable coronary artery disease and isolated stenosis (>75%) of the LAD coronary artery who underwent successful PCI with stent implantation...
September 15, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27313412/effect-of-tinospora-cordifolia-on-physical-and-cardiovascular-performance-induced-by-physical-stress-in-healthy-human-volunteers
#17
Bharat A Salve, Raakhi K Tripathi, Anup U Petare, Ashwinikumar A Raut, Nirmala N Rege
INTRODUCTION: In Ayurveda Tinospora cordifolia (Willd.) Miers., has been used for its Rasayana, Deepana, Jwaranashana, Tridosha Shamaka properties. It is an immunomodulator, useful in stress, hyperlipidemia, pyrexia. T. cordifolia was evaluated for adaptogenic activity in healthy volunteers during exercise. AIMS: The primary objective of this study was to evaluate the effect of T. cordifolia on physical performance, and secondary objectives were to evaluate muscle power, maximal oxygen consumption, and sympathetic activity in comparison with placebo when subjected to physical stress...
July 2015: Ayu
https://www.readbyqxmd.com/read/27295522/exercise-training-attenuates-the-pressor-response-evoked-by-peripheral-chemoreflex-in-rats-with-heart-failure
#18
Leonardo Calegari, Bruna B Mozzaquattro, Douglas D Rossato, Edson Quagliotto, Janaina B Ferreira, Alberto Rasia-Filho, Pedro Dal Lago
The effects of exercise training (ExT) on the pressor response elicited by potassium cyanide (KCN) in the rat model of ischemia-induced heart failure (HF) are unknown. We evaluated the effects of ExT on chemoreflex sensitivity and its interaction with baroreflex in rats with HF. Wistar rats were divided into four groups: trained HF (Tr-HF), sedentary HF (Sed-HF), trained sham (Tr-Sham), and sedentary sham (Sed-Sham). Trained animals underwent to a treadmill running protocol for 8 weeks (60 m/day, 5 days/week, 16 m/min)...
September 2016: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/27170660/high-dietary-phosphate-intake-induces-hypertension-and-augments-exercise-pressor-reflex-function-in-rats
#19
Masaki Mizuno, Jere H Mitchell, Scott Crawford, Chou-Long Huang, Naim Maalouf, Ming-Chang Hu, Orson W Moe, Scott A Smith, Wanpen Vongpatanasin
An increasing number of studies have linked high dietary phosphate (Pi) intake to hypertension. It is well established that the rise in sympathetic nerve activity (SNA) and blood pressure (BP) during physical exertion is exaggerated in many forms of hypertension, which are primarily mediated by an overactive skeletal muscle exercise pressor reflex (EPR). However, it remains unknown whether high dietary Pi intake potentiates the EPR-mediated SNA and BP response to exercise. Accordingly, we measured renal SNA (RSNA) and mean BP (MBP) in normotensive Sprague-Dawley rats fed a normal Pi diet (0...
July 1, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27160957/l-citrulline-supplementation-attenuates-blood-pressure-wave-reflection-and-arterial-stiffness-responses-to-metaboreflex-and-cold-stress-in-overweight-men
#20
Arturo Figueroa, Stacey Alvarez-Alvarado, Salvador J Jaime, Roy Kalfon
Combined isometric exercise or metaboreflex activation (post-exercise muscle ischaemia (PEMI)) and cold pressor test (CPT) increase cardiac afterload, which may lead to adverse cardiovascular events. l-Citrulline supplementation (l-CIT) reduces systemic arterial stiffness (brachial-ankle pulse wave velocity (baPWV)) at rest and aortic haemodynamic responses to CPT. The aim of this study was to determine the effect of l-CIT on aortic haemodynamic and baPWV responses to PEMI+CPT. In all, sixteen healthy, overweight/obese males (age 24 (sem 6) years; BMI 29·3 (sem 4·0) kg/m2) were randomly assigned to placebo or l-CIT (6 g/d) for 14 d in a cross-over design...
July 2016: British Journal of Nutrition
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