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Bozkurt S, Ayten UE. ln silico simulation of the interaction among autoregulatory mechanisms regulating cerebral blood flow rate in the healthy and systolic heart failure conditions during exercise. Med Biol Eng Comput 2022; 60:1863-1879. [DOI: 10.1007/s11517-022-02585-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Accepted: 04/22/2022] [Indexed: 11/29/2022]
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Gama G, Farinatti P, Crisafulli A, Borges J. Blood Pressure Response to Muscle Metaboreflex Activation is Impaired in Men Living with HIV. Int J Sports Med 2020; 42:246-252. [PMID: 33053597 DOI: 10.1055/a-1263-1124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We investigated the muscle metaboreflex contribution to blood pressure response during dynamic handgrip exercise in men living with HIV (MLHIV) vs. without HIV (Controls). Pressor and heart rate responses were evaluated during metaboreflex activation through post-exercise muscle ischemia (PEMI) method and control exercise session (CER) in 17 MLHIV and 21 Controls. Protocols were performed randomly on the same day, being both sessions composed of 12 min, as follows: a) 3 min at rest, b) 3 min of dynamic handgrip exercise at 30% of maximal voluntary contraction, c) 3 min of recovery post-exercise with vascular occlusion (occlusion only in PEMI), and d) 3 min of recovery post-exercise without vascular occlusion. To assess metaboreflex response, differences between PEMI and CER in recovery post-exercise were calculated for blood pressure and heart rate. Systolic and mean blood pressure (P<0.01) were superior in the last 2 min of recovery with vascular occlusion at PEMI in relation to CER for both groups. No difference was found between groups for blood pressure and heart rate (P>0.05). However, metaboreflex response for systolic blood pressure was lower in MLHIV vs. Controls (4.05±4.63 vs. 7.61±3.99 mmHg; P=0.01). In conclusion, pressor response during metaboreceptor stimulation was attenuated in men living with HIV, which may suggest loss of muscle metaboreflex sensibility.
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Affiliation(s)
- Gabriel Gama
- Laboratory of Physical Activity and Health Promotion, University of Rio de Janeiro State, Rio de Janeiro, Brazil
| | - Paulo Farinatti
- Laboratory of Physical Activity and Health Promotion, University of Rio de Janeiro State, Rio de Janeiro, Brazil.,Graduate Program in Physical Activity Sciences, Salgado de Oliveira University, Niteroi, Brazil
| | - Antonio Crisafulli
- Department of Medical Science and Public Health, University of Cagliari, Italy
| | - Juliana Borges
- Laboratory of Physical Activity and Health Promotion, University of Rio de Janeiro State, Rio de Janeiro, Brazil
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Mannozzi J, Kaur J, Spranger MD, Al-Hassan MH, Lessanework B, Alvarez A, Chung CS, O'Leary DS. Muscle metaboreflex-induced increases in effective arterial elastance: effect of heart failure. Am J Physiol Regul Integr Comp Physiol 2020; 319:R1-R10. [PMID: 32348680 DOI: 10.1152/ajpregu.00040.2020] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dynamic exercise elicits robust increases in sympathetic activity in part due to muscle metaboreflex activation (MMA), a pressor response triggered by activation of skeletal muscle afferents. MMA during dynamic exercise increases arterial pressure by increasing cardiac output via increases in heart rate, ventricular contractility, and central blood volume mobilization. In heart failure, ventricular function is compromised, and MMA elicits peripheral vasoconstriction. Ventricular-vascular coupling reflects the efficiency of energy transfer from the left ventricle to the systemic circulation and is calculated as the ratio of effective arterial elastance (Ea) to left ventricular maximal elastance (Emax). The effect of MMA on Ea in normal subjects is unknown. Furthermore, whether muscle metaboreflex control of Ea is altered in heart failure has not been investigated. We utilized two previously published methods of evaluating Ea [end-systolic pressure/stroke volume (EaPV)] and [heart rate × vascular resistance (EaZ)] during rest, mild treadmill exercise, and MMA (induced via partial reductions in hindlimb blood flow imposed during exercise) in chronically instrumented conscious canines before and after induction of heart failure via rapid ventricular pacing. In healthy animals, MMA elicits significant increases in effective arterial elastance and stroke work that likely maintains ventricular-vascular coupling. In heart failure, Ea is high, and MMA-induced increases are exaggerated, which further exacerbates the already uncoupled ventricular-vascular relationship, which likely contributes to the impaired ability to raise stroke work and cardiac output during exercise in heart failure.
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Affiliation(s)
- Joseph Mannozzi
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan
| | - Jasdeep Kaur
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan
| | - Marty D Spranger
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan
| | | | - Beruk Lessanework
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan
| | - Alberto Alvarez
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan
| | - Charles S Chung
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan
| | - Donal S O'Leary
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan
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Shioya-Yamada M, Shimada K, Nishitani-Yokoyama M, Sai E, Takeno K, Tamura Y, Watada H, Kawamori R, Daida H, Kawai S. Association Between Visceral Fat Accumulation and Exercise Tolerance in Non-Obese Subjects Without Diabetes. J Clin Med Res 2018; 10:630-635. [PMID: 29977420 PMCID: PMC6031249 DOI: 10.14740/jocmr3403w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 06/04/2018] [Indexed: 12/21/2022] Open
Abstract
Background We examined the associations between visceral fat accumulation, presence of the components of metabolic syndrome (MetS), and exercise tolerance in non-obese subjects without diabetes. Methods Seventy-four non-obese, non-diabetic Japanese men were enrolled. The subjects were divided into the following two groups: non-obese subjects without any MetS risk factors (n = 38, Group A) and non-obese subjects with one or two MetS risk factors (n = 36, Group B). Anthropometric and metabolic parameters were measured. The response of heart rate (HR) and blood pressure (BP), and exercise tolerance were also evaluated with a cardiopulmonary exercise test using a bicycle ergometer. Results The body mass index, abdominal circumference, visceral fat area, and homeostasis model assessment-insulin resistance, were significantly higher, while levels of anaerobic threshold and maximal oxygen uptake were significantly lower in Group B than in Group A. The levels of resting HR, resting BP, and BP at maximal exercise were significantly higher in Group B than in Group A. There were no significant differences in the HR at maximal exercise as well as the HR and BP after exercise between the two groups. The visceral fat area was significantly and negatively correlated with exercise tolerance. Multivariate linear regression analyses demonstrated that visceral fat area, but not abdominal circumference, was significantly and independently associated with maximal oxygen uptake. Conclusions These data suggest that the visceral fat area is a significant determinant for exercise tolerance even in non-obese subjects without diabetes.
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Affiliation(s)
- Miki Shioya-Yamada
- Juntendo University Graduate School of Health and Sports Science, Chiba, Japan
| | - Kazunori Shimada
- Juntendo University Graduate School of Health and Sports Science, Chiba, Japan.,Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Miho Nishitani-Yokoyama
- Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Eiryu Sai
- Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kageumi Takeno
- Department of Metabolism and Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Yoshifumi Tamura
- Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Metabolism and Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hirotaka Watada
- Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Metabolism and Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Ryuzo Kawamori
- Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Department of Metabolism and Endocrinology, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hiroyuki Daida
- Department of Cardiovascular Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan.,Sportology Center, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Sachio Kawai
- Juntendo University Graduate School of Health and Sports Science, Chiba, Japan
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