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Shirzad M, Tari B, Dalton C, Van Riesen J, Marsala MJ, Heath M. Passive exercise increases cerebral blood flow velocity and supports a postexercise executive function benefit. Psychophysiology 2022; 59:e14132. [PMID: 35781673 DOI: 10.1111/psyp.14132] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 06/09/2022] [Accepted: 06/10/2022] [Indexed: 12/16/2022]
Abstract
Executive function entails high-level cognitive control supporting activities of daily living. Literature has shown that a single-bout of exercise involving volitional muscle activation (i.e., active exercise) improves executive function and that an increase in cerebral blood flow (CBF) may contribute to this benefit. It is, however, unknown whether non-volitional exercise (i.e., passive exercise) wherein an individual's limbs are moved via an external force elicits a similar executive function benefit. This is a salient question given that proprioceptive and feedforward drive from passive exercise increases CBF independent of the metabolic demands of active exercise. Here, in a procedural validation participants (n = 2) used a cycle ergometer to complete separate 20-min active and passive (via mechanically driven flywheel) exercise conditions and a non-exercise control condition. Electromyography showed that passive exercise did not increase agonist muscle activation or increase ventilation or gas exchange variables (i.e., V̇O2 and V̇CO2 ). In a main experiment participants (n = 28) completed the same exercise and control conditions and transcranial Doppler ultrasound showed that active and passive exercise (but not the control condition) increased CBF through the middle cerebral artery (ps <.001); albeit the magnitude was less during passive exercise. Notably, antisaccade reaction times prior to and immediately after each condition showed that active (p < .001) and passive (p = .034) exercise improved an oculomotor-based measure of executive function, whereas no benefit was observed in the control condition (p = .85). Accordingly, results evince that passive exercise 'boosts' an oculomotor-based measure of executive function and supports convergent evidence that increased CBF mediates this benefit.
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Affiliation(s)
- Mustafa Shirzad
- School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, Ontario, Canada
| | - Benjamin Tari
- School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, Ontario, Canada
| | - Connor Dalton
- School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, Ontario, Canada
| | - James Van Riesen
- Graduate Program in Neuroscience, University of Western Ontario, London, Ontario, Canada
| | - Michael J Marsala
- School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, Ontario, Canada
| | - Matthew Heath
- School of Kinesiology, Faculty of Health Sciences, University of Western Ontario, London, Ontario, Canada.,Graduate Program in Neuroscience, University of Western Ontario, London, Ontario, Canada.,Canadian Centre for Activity and Aging, University of Western Ontario, London, Ontario, Canada
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Järve A, Qadri F, Todiras M, Schmolke S, Bader M. Angiotensin-II receptor type Ia does not contribute to cardiac atrophy following high-thoracic spinal cord injury in mice. Exp Physiol 2020; 105:1316-1325. [PMID: 32515106 DOI: 10.1113/ep088378] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Accepted: 06/03/2020] [Indexed: 12/27/2022]
Abstract
NEW FINDINGS What is the central question of this study? What is the role of the renin-angiotensin system with angiotensin II acting via its receptor AT1a in spinal cord injury-induced cardiac atrophy? What is the main finding and its importance? Knockout of AT1a did not protect mice that had undergone thoracic level 4 transection from cardiac atrophy. There were no histopathological signs but there was reduced load-dependent left ventricular function (lower stroke volume and cardiac output) with preserved ejection fraction. ABSTRACT Spinal cord injury (SCI) leads to cardiac atrophy often accompanied by functional deficits. The renin-angiotensin system (RAS) with angiotensin II (AngII) signalling via its receptor AT1a might contribute to cardiac atrophy post-SCI. We performed spinal cord transection at thoracic level T4 (T4-Tx) or sham-operation in female wild-type mice (WT, n = 27) and mice deficient in AT1a (Agtr1a-/- , n = 27). Echocardiography (0, 7, 21 and 28 days post-SCI) and histology and gene expression analyses at 1 and 2 months post-SCI were performed. We found cardiac atrophy post-SCI: reduced heart weight, reduced estimated left ventricular mass in Agtr1a-/- , and reduced cardiomyocyte diameter in WT mice. Although, the latter as well as stroke volume (SV) and cardiac output (CO) were reduced in Agtr1a-/- mice already at baseline, cardiomyocyte diameter was even smaller in injured Agtr1a-/- mice compared to injured WT mice. SV and CO were reduced in WT mice post-SCI. Ejection fraction and fractional shortening were preserved post-SCI in both genotypes. There were no histological signs of fibrosis and pathology in the cardiac sections of either genotype post-SCI. Gene expression of Agtr1a showed a trend for up-regulation at 2 months post-SCI; angiotensinogen was up-regulated at 2 month post-SCI in both genotypes. AngII receptor type 2 (Agtr2) was up- and down-regulated at 1 and 2 months post-SCI in WT mice, respectively, and Ang-(1-7) receptor (Mas) at 1 and 2 months post-SCI. Atrogin-1/MAFbx and MuRF1, atrophy markers, were not significantly up-regulated post-SCI. Our data show that lack of AT1a does not protect from cardiac atrophy post-SCI.
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Affiliation(s)
- Anne Järve
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Berlin, Berlin, Germany
| | - Fatimunnisa Qadri
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
| | - Mihail Todiras
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany.,Nicolae Testemițanu State University of Medicine and Pharmacy, Chisinau, Moldova
| | - Shirley Schmolke
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
| | - Michael Bader
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Berlin, Berlin, Germany.,Charité Universitätsmedizin Berlin, Berlin, Germany.,Institute for Biology, University of Lübeck, Lübeck, Germany
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Järve A, Qadri F, Todiras M, Schmolke S, Alenina N, Bader M. Angiotensin-(1-7) Receptor Mas Deficiency Does Not Exacerbate Cardiac Atrophy Following High-Level Spinal Cord Injury in Mice. Front Physiol 2020; 11:203. [PMID: 32226394 PMCID: PMC7080696 DOI: 10.3389/fphys.2020.00203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 02/21/2020] [Indexed: 11/13/2022] Open
Abstract
Experimental spinal cord injury (SCI) causes a morphological and functional deterioration of the heart, in which the renin–angiotensin system (RAS) might play a role. The recently discovered non-canonical axis of RAS with angiotensin-(1–7) and its receptor Mas, which is associated with cardioprotection could be essential to prevent damage to the heart following SCI. We investigated the cardiac consequences of SCI and the role of Mas in female wild-type (WT, n = 22) and mice deficient of Mas (Mas–/–, n = 25) which underwent spinal cord transection at thoracic level T4 (T4-Tx) or sham-operation by echocardiography (0, 7, 21, and 28 days post-SCI), histology and gene expression analysis at 1 or 2 months post-SCI. We found left ventricular mass reduction with preserved ejection fraction (EF) and fractional shortening in WT as well as Mas–/– mice. Cardiac output was reduced in Mas–/– mice, whereas stroke volume (SV) was reduced in WT T4-Tx mice. Echocardiographic indices did not differ between the genotypes. Smaller heart weight (HW) and smaller cardiomyocyte diameter at 1 month post-SCI compared to sham mice was independent of genotype. The muscle-specific E3 ubiquitin ligases Atrogin-1/MAFbx and MuRF1 were upregulated or showed a trend for upregulation in WT mice at 2 months post-SCI, respectively. Angiotensinogen gene expression was upregulated at 1 month post-SCI and angiotensin II receptor type 2 downregulated at 2 month post-SCI in Mas–/– mice. Mas was downregulated post-SCI. Cardiac atrophy following SCI, not exacerbated by lack of Mas, is a physiological reaction as there were no signs of cardiac pathology and dysfunction.
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Affiliation(s)
- Anne Järve
- Max Delbrück Center for Molecular Medicine, Helmholtz Association of German Research Centers, Berlin, Germany.,Partner Site Berlin, German Center for Cardiovascular Research, Berlin, Germany
| | - Fatimunnisa Qadri
- Max Delbrück Center for Molecular Medicine, Helmholtz Association of German Research Centers, Berlin, Germany
| | - Mihail Todiras
- Max Delbrück Center for Molecular Medicine, Helmholtz Association of German Research Centers, Berlin, Germany.,Nicolae Testemiţanu State University of Medicine and Pharmacy, Chişinãu, Moldova
| | - Shirley Schmolke
- Max Delbrück Center for Molecular Medicine, Helmholtz Association of German Research Centers, Berlin, Germany
| | - Natalia Alenina
- Max Delbrück Center for Molecular Medicine, Helmholtz Association of German Research Centers, Berlin, Germany.,Partner Site Berlin, German Center for Cardiovascular Research, Berlin, Germany
| | - Michael Bader
- Max Delbrück Center for Molecular Medicine, Helmholtz Association of German Research Centers, Berlin, Germany.,Partner Site Berlin, German Center for Cardiovascular Research, Berlin, Germany.,Charité Universitätsmedizin Berlin, Berlin, Germany.,Institute for Biology, University of Lübeck, Lübeck, Germany
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Lujan HL, DiCarlo SE. Fundamental hemodynamic mechanisms mediating the response to myocardial ischemia in conscious paraplegic mice: cardiac output versus peripheral resistance. Physiol Rep 2017; 5:5/6/e13214. [PMID: 28336819 PMCID: PMC5371571 DOI: 10.14814/phy2.13214] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 02/21/2017] [Accepted: 02/22/2017] [Indexed: 11/25/2022] Open
Abstract
Autonomic dysfunction, a relative sedentary lifestyle, a reduced muscle mass and increased adiposity leads to metabolic abnormalities that accelerate the development of coronary artery disease (CAD) in individuals living with spinal cord injury (SCI). An untoward cardiac incident is related to the degree of CAD, suggesting that the occurrence of a significant cardiac event is significantly higher for individuals with SCI. Thus, understanding the fundamental hemodynamic mechanisms mediating the response to myocardial ischemia has the potential to positively impact individuals and families living with SCI. Accordingly, we systematically investigated if thoracic level 5 spinal cord transection (T5X; paraplegia) alters the arterial blood pressure response to coronary artery occlusion and if the different arterial blood pressure responses to coronary artery occlusion between intact and paraplegic mice are mediated by changes in cardiac output and or systemic peripheral resistance and whether differences in cardiac output are caused by changes in heart rate and or stroke volume. To achieve this goal, the tolerance to 3 min of coronary artery occlusion was determined in conscious intact and paraplegic mice. Paraplegic mice had an impaired ability to maintain arterial blood pressure during coronary artery occlusion as arterial pressure fell to near lethal levels by 1.38 ± 0.64 min. The lower arterial pressure was mediated by a lower cardiac output as systemic peripheral resistance was elevated in paraplegic mice. The lower cardiac output was mediated by a reduced heart rate and stroke volume. These results indicate that in paraplegic mice, the arterial pressure response to coronary artery occlusion is hemodynamically mediated primarily by cardiac output which is determined by heart rate and stroke volume.
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Affiliation(s)
- Heidi L Lujan
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan
| | - Stephen E DiCarlo
- Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan
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DeVeau KM, Harman KA, Squair JW, Krassioukov AV, Magnuson DSK, West CR. A comparison of passive hindlimb cycling and active upper-limb exercise provides new insights into systolic dysfunction after spinal cord injury. Am J Physiol Heart Circ Physiol 2017; 313:H861-H870. [PMID: 28710067 PMCID: PMC9925118 DOI: 10.1152/ajpheart.00046.2017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 07/05/2017] [Accepted: 07/12/2017] [Indexed: 12/24/2022]
Abstract
Active upper-limb and passive lower-limb exercise are two interventions used in the spinal cord injury (SCI) population. Although the global cardiac responses have been previously studied, it is unclear how either exercise influences contractile cardiac function. Here, the cardiac contractile and volumetric responses to upper-limb (swim) and passive lower-limb exercise were investigated in rodents with a severe high-thoracic SCI. Animals were divided into control (CON), SCI no exercise (NO-EX), SCI passive hindlimb cycling (PHLC), or SCI swim (SWIM) groups. Severe contusion SCI was administered at the T2 level. PHLC and SWIM interventions began on day 8 postinjury and lasted 25 days. Echocardiography and dobutamine stress echocardiography were performed before and after injury. Cardiac contractile indexes were assessed in vivo at study termination via a left ventricular pressure-volume conductance catheter. Stroke volume was reduced after SCI (91 µl in the NO-EX group vs. 188 µl in the CON group, P < 0.05) and was reversed at study termination in the PHLC (167 µl) but not SWIM (90 µl) group. Rates of contraction were reduced in NO-EX versus CON groups (6,079 vs. 9,225 mmHg, respectively, P < 0.05) and were unchanged by PHLC and SWIM training. Similarly, end-systolic elastance was reduced in the NO-EX versus CON groups (0.67 vs. 1.37 mmHg/µl, respectively, P < 0.05) and was unchanged by PHLC or SWIM training. Dobutamine infusion normalized all pressure indexes in each SCI group (all P < 0.05). In conclusion, PHLC improves flow-derived cardiac indexes, whereas SWIM training displayed no cardiobeneficial effect. Pressure-derived deficits were corrected only with dobutamine, suggesting that reduced β-adrenergic stimulation is principally responsible for the impaired cardiac contractile function after SCI.NEW & NOTEWORTHY This is the first direct comparison between the cardiac changes elicited by active upper-limb or passive lower-limb exercise after spinal cord injury. Here, we demonstrate that lower-limb exercise positively influences flow-derived cardiac indexes, whereas upper-limb exercise does not. Furthermore, neither intervention corrects the cardiac contractile dysfunction associated with spinal cord injury.
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Affiliation(s)
- Kathryn M. DeVeau
- 1International Collaboration on Repair Discoveries, Vancouver, British Columbia, Canada; ,2Kentucky Spinal Cord Injury Research Institute, University of Louisville, Louisville, Kentucky;
| | - Kathryn A. Harman
- 1International Collaboration on Repair Discoveries, Vancouver, British Columbia, Canada; ,2Kentucky Spinal Cord Injury Research Institute, University of Louisville, Louisville, Kentucky;
| | - Jordan W. Squair
- 1International Collaboration on Repair Discoveries, Vancouver, British Columbia, Canada; ,3MD/PhD Training Program, Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada;
| | - Andrei V. Krassioukov
- 4Division of Physical Medicine and Rehabilitation, Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada; ,5GF Strong Rehabilitation Centre, Vancouver Health Authority, Vancouver, British Columbia, Canada; and
| | - David S. K. Magnuson
- 2Kentucky Spinal Cord Injury Research Institute, University of Louisville, Louisville, Kentucky;
| | - Christopher R. West
- 1International Collaboration on Repair Discoveries, Vancouver, British Columbia, Canada; ,6School of Kinesiology, University of British Columbia, Vancouver, British Columbia, Canada
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Popok DW, West CR, McCracken L, Krassioukov AV. Effects of early and delayed initiation of exercise training on cardiac and haemodynamic function after spinal cord injury. Exp Physiol 2017; 102:154-163. [DOI: 10.1113/ep085978] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 11/28/2016] [Indexed: 11/08/2022]
Affiliation(s)
- David W. Popok
- International Collaboration on Repair Discoveries (ICORD); University of British Columbia; Vancouver BC Canada
| | - Christopher R. West
- International Collaboration on Repair Discoveries (ICORD); University of British Columbia; Vancouver BC Canada
- School of Kinesiology; Faculty of Education; University of British Columbia; Vancouver BC Canada
| | - Laura McCracken
- International Collaboration on Repair Discoveries (ICORD); University of British Columbia; Vancouver BC Canada
| | - Andrei V. Krassioukov
- International Collaboration on Repair Discoveries (ICORD); University of British Columbia; Vancouver BC Canada
- Faculty of Medicine; Division of Physical Medicine and Rehabilitation; University of British Columbia; Vancouver BC Canada
- GF Strong Rehabilitation Centre; Vancouver Coastal Health; Vancouver BC Canada
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Garbeloti EJR, Paiva RCA, Restini CBA, Durand MT, Miranda CES, Teixeira VE. Biochemical biomarkers are not dependent on physical exercise in patients with spinal cord injury. BBA CLINICAL 2016; 6:5-11. [PMID: 27331022 PMCID: PMC4900297 DOI: 10.1016/j.bbacli.2016.05.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Revised: 04/29/2016] [Accepted: 05/03/2016] [Indexed: 11/05/2022]
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Ma Z, Fang F, Chui KL, Chen T, Cheng XG, Yu CM, Zhao XS. A Rare Etiology of Severe Acute Heart Failure: Subacute Spinal Subdural Hematoma in a Young Woman. Int J Cardiol 2015; 195:61-3. [DOI: 10.1016/j.ijcard.2015.05.083] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 05/14/2015] [Indexed: 11/30/2022]
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