The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Giovani Dos Santos Cunha - One of the best experts on this subject based on the ideXlab platform.
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echo intensity is associated with skeletal muscle power and Cardiovascular Performance in elderly men
Experimental Gerontology, 2012Co-Authors: Eduardo Lusa Cadore, Marco Aurélio Vaz, Mikel Izquierdo, Matheus Conceição, Regis Radaelli, Ronei Silveira Pinto, Bruno Manfredini Baroni, Cristine Lima Alberton, Stephanie Santana Pinto, Giovani Dos Santos CunhaAbstract:The purpose of the present study was to investigate the relationship between echo intensity, neuromuscular and cardiorespiratory Performances in the elderly. Thirty-one healthy elderly men (65.5±5.0) participated in this study. Echo intensity of rectus femoris and quadriceps femoris muscle thicknesses was determined by ultrasound images. Lower-body isometric and isokinetic peak torques (60, 180 and 360°(.s-1)), as well as rate of force development were evaluated as strength parameters. In addition, torque per unit of muscle mass was evaluated by the quotient between isometric peak torque of the knee extensors and the quadriceps femoris muscle thickness. The peak oxygen uptake (VO(2peak)), maximum aerobic workload (W(max)), absolute (VT(1) and VT(2)) ventilatory thresholds, as well as workloads at VT(1) and VT(2) (W(VT1) and W(VT2)) were evaluated during a maximal incremental test on a cycle ergometer. There were significant negative correlations between the individual values of echo intensity with the corresponding individual values of isometric and isokinetic peak torques (60, 180 and 360°(.s-1)) (r=-0.48 to r=-0.64; P<0.05), as well as with W(VT1) (r=-0.46) and W(VT2) (r=-0.50) (P<0.05). In addition, significant positive correlations were observed between torque per unit of muscle mass and Cardiovascular parameters (r=0.52 to r=0.60; P<0.001). The present results suggest that the echo intensity analysis using computer-aided gray-scale analysis is a low cost, easily accessible, and a safe method to evaluate the muscle quality, and may contribute to the research of neuromuscular and Cardiovascular Performances in the elderly.
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Echo intensity is associated with skeletal muscle power and Cardiovascular Performance in elderly men
Experimental gerontology, 2012Co-Authors: Eduardo Lusa Cadore, Marco Aurélio Vaz, Mikel Izquierdo, Matheus Conceição, Regis Radaelli, Ronei Silveira Pinto, Bruno Manfredini Baroni, Cristine Lima Alberton, Stephanie Santana Pinto, Giovani Dos Santos CunhaAbstract:The purpose of the present study was to investigate the relationship between echo intensity, neuromuscular and cardiorespiratory Performances in the elderly. Thirty-one healthy elderly men (65.5±5.0) participated in this study. Echo intensity of rectus femoris and quadriceps femoris muscle thicknesses was determined by ultrasound images. Lower-body isometric and isokinetic peak torques (60, 180 and 360°(.s-1)), as well as rate of force development were evaluated as strength parameters. In addition, torque per unit of muscle mass was evaluated by the quotient between isometric peak torque of the knee extensors and the quadriceps femoris muscle thickness. The peak oxygen uptake (VO(2peak)), maximum aerobic workload (W(max)), absolute (VT(1) and VT(2)) ventilatory thresholds, as well as workloads at VT(1) and VT(2) (W(VT1) and W(VT2)) were evaluated during a maximal incremental test on a cycle ergometer. There were significant negative correlations between the individual values of echo intensity with the corresponding individual values of isometric and isokinetic peak torques (60, 180 and 360°(.s-1)) (r=-0.48 to r=-0.64; P
E. J. G. Milroy - One of the best experts on this subject based on the ideXlab platform.
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Cardiovascular Performance and Core Temperature During Transurethral Prostatectomy
The Journal of Urology, 1994Co-Authors: J.w. Hugh Evans, Mervyn Singer, S.w.v. Coppinger, Nicholas Macartney, J. Malcolm Walker, E. J. G. MilroyAbstract:AbstractHemodynamic Performance and core temperature were recorded during transurethral prostatectomy in 52 patients who were stratified according to cardiac symptom score and then randomized to undergo standard (31) or isothermic (21) transurethral prostatectomy. During the standard procedure ambient temperature (21C) irrigant was used, while during isothermic prostatectomy warmed irrigant at 38C was used to prevent heat loss from the bladder, and a warming blanket and humidifying filter were used to decrease cutaneous and respiratory heat loss. Core temperature decreased by a mean of 0.8C (95% confidence interval −0.9 to −0.7) during standard transurethral prostatectomy and by 0.27C (−0.4 to −0.15) during the isothermic procedure. The standard prostatectomy group showed a significant hemodynamic response consisting of increased mean arterial pressure (p
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Cardiovascular Performance and core temperature during transurethral prostatectomy.
The Journal of urology, 1994Co-Authors: J.w. Hugh Evans, Mervyn Singer, S.w.v. Coppinger, Nicholas Macartney, J. Malcolm Walker, E. J. G. MilroyAbstract:Hemodynamic Performance and core temperature were recorded during transurethral prostatectomy in 52 patients who were stratified according to cardiac symptom score and then randomized to undergo standard (31) or isothermic (21) transurethral prostatectomy. During the standard procedure ambient temperature (21C) irrigant was used, while during isothermic prostatectomy warmed irrigant at 38C was used to prevent heat loss from the bladder, and a warming blanket and humidifying filter were used to decrease cutaneous and respiratory heat loss. Core temperature decreased by a mean of 0.8C (95% confidence interval -0.9 to -0.7) during standard transurethral prostatectomy and by 0.27C (-0.4 to -0.15) during the isothermic procedure. The standard prostatectomy group showed a significant hemodynamic response consisting of increased mean arterial pressure (p < 0.0002), increased index of systemic vascular resistance (p < 0.0001), bradycardia (p < 0.02), and decreased Doppler indexes of stroke volume (p < 0.005) and cardiac output (p < 0.001). The isothermic transurethral prostatectomy group was hemodynamically stable. These differences between the groups suggest that rapid central cooling exerted a significant effect on perioperative hemodynamic Performance during transurethral prostatectomy.
Eduardo Lusa Cadore - One of the best experts on this subject based on the ideXlab platform.
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echo intensity is associated with skeletal muscle power and Cardiovascular Performance in elderly men
Experimental Gerontology, 2012Co-Authors: Eduardo Lusa Cadore, Marco Aurélio Vaz, Mikel Izquierdo, Matheus Conceição, Regis Radaelli, Ronei Silveira Pinto, Bruno Manfredini Baroni, Cristine Lima Alberton, Stephanie Santana Pinto, Giovani Dos Santos CunhaAbstract:The purpose of the present study was to investigate the relationship between echo intensity, neuromuscular and cardiorespiratory Performances in the elderly. Thirty-one healthy elderly men (65.5±5.0) participated in this study. Echo intensity of rectus femoris and quadriceps femoris muscle thicknesses was determined by ultrasound images. Lower-body isometric and isokinetic peak torques (60, 180 and 360°(.s-1)), as well as rate of force development were evaluated as strength parameters. In addition, torque per unit of muscle mass was evaluated by the quotient between isometric peak torque of the knee extensors and the quadriceps femoris muscle thickness. The peak oxygen uptake (VO(2peak)), maximum aerobic workload (W(max)), absolute (VT(1) and VT(2)) ventilatory thresholds, as well as workloads at VT(1) and VT(2) (W(VT1) and W(VT2)) were evaluated during a maximal incremental test on a cycle ergometer. There were significant negative correlations between the individual values of echo intensity with the corresponding individual values of isometric and isokinetic peak torques (60, 180 and 360°(.s-1)) (r=-0.48 to r=-0.64; P<0.05), as well as with W(VT1) (r=-0.46) and W(VT2) (r=-0.50) (P<0.05). In addition, significant positive correlations were observed between torque per unit of muscle mass and Cardiovascular parameters (r=0.52 to r=0.60; P<0.001). The present results suggest that the echo intensity analysis using computer-aided gray-scale analysis is a low cost, easily accessible, and a safe method to evaluate the muscle quality, and may contribute to the research of neuromuscular and Cardiovascular Performances in the elderly.
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Echo intensity is associated with skeletal muscle power and Cardiovascular Performance in elderly men
Experimental gerontology, 2012Co-Authors: Eduardo Lusa Cadore, Marco Aurélio Vaz, Mikel Izquierdo, Matheus Conceição, Regis Radaelli, Ronei Silveira Pinto, Bruno Manfredini Baroni, Cristine Lima Alberton, Stephanie Santana Pinto, Giovani Dos Santos CunhaAbstract:The purpose of the present study was to investigate the relationship between echo intensity, neuromuscular and cardiorespiratory Performances in the elderly. Thirty-one healthy elderly men (65.5±5.0) participated in this study. Echo intensity of rectus femoris and quadriceps femoris muscle thicknesses was determined by ultrasound images. Lower-body isometric and isokinetic peak torques (60, 180 and 360°(.s-1)), as well as rate of force development were evaluated as strength parameters. In addition, torque per unit of muscle mass was evaluated by the quotient between isometric peak torque of the knee extensors and the quadriceps femoris muscle thickness. The peak oxygen uptake (VO(2peak)), maximum aerobic workload (W(max)), absolute (VT(1) and VT(2)) ventilatory thresholds, as well as workloads at VT(1) and VT(2) (W(VT1) and W(VT2)) were evaluated during a maximal incremental test on a cycle ergometer. There were significant negative correlations between the individual values of echo intensity with the corresponding individual values of isometric and isokinetic peak torques (60, 180 and 360°(.s-1)) (r=-0.48 to r=-0.64; P
J.w. Hugh Evans - One of the best experts on this subject based on the ideXlab platform.
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Cardiovascular Performance and Core Temperature During Transurethral Prostatectomy
The Journal of Urology, 1994Co-Authors: J.w. Hugh Evans, Mervyn Singer, S.w.v. Coppinger, Nicholas Macartney, J. Malcolm Walker, E. J. G. MilroyAbstract:AbstractHemodynamic Performance and core temperature were recorded during transurethral prostatectomy in 52 patients who were stratified according to cardiac symptom score and then randomized to undergo standard (31) or isothermic (21) transurethral prostatectomy. During the standard procedure ambient temperature (21C) irrigant was used, while during isothermic prostatectomy warmed irrigant at 38C was used to prevent heat loss from the bladder, and a warming blanket and humidifying filter were used to decrease cutaneous and respiratory heat loss. Core temperature decreased by a mean of 0.8C (95% confidence interval −0.9 to −0.7) during standard transurethral prostatectomy and by 0.27C (−0.4 to −0.15) during the isothermic procedure. The standard prostatectomy group showed a significant hemodynamic response consisting of increased mean arterial pressure (p
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Cardiovascular Performance and core temperature during transurethral prostatectomy.
The Journal of urology, 1994Co-Authors: J.w. Hugh Evans, Mervyn Singer, S.w.v. Coppinger, Nicholas Macartney, J. Malcolm Walker, E. J. G. MilroyAbstract:Hemodynamic Performance and core temperature were recorded during transurethral prostatectomy in 52 patients who were stratified according to cardiac symptom score and then randomized to undergo standard (31) or isothermic (21) transurethral prostatectomy. During the standard procedure ambient temperature (21C) irrigant was used, while during isothermic prostatectomy warmed irrigant at 38C was used to prevent heat loss from the bladder, and a warming blanket and humidifying filter were used to decrease cutaneous and respiratory heat loss. Core temperature decreased by a mean of 0.8C (95% confidence interval -0.9 to -0.7) during standard transurethral prostatectomy and by 0.27C (-0.4 to -0.15) during the isothermic procedure. The standard prostatectomy group showed a significant hemodynamic response consisting of increased mean arterial pressure (p < 0.0002), increased index of systemic vascular resistance (p < 0.0001), bradycardia (p < 0.02), and decreased Doppler indexes of stroke volume (p < 0.005) and cardiac output (p < 0.001). The isothermic transurethral prostatectomy group was hemodynamically stable. These differences between the groups suggest that rapid central cooling exerted a significant effect on perioperative hemodynamic Performance during transurethral prostatectomy.
David P. Philipp - One of the best experts on this subject based on the ideXlab platform.
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Cardiovascular Performance of six species of field-acclimatized centrarchid sunfish during the parental care period.
The Journal of experimental biology, 2010Co-Authors: Steven J. Cooke, Jason F. Schreer, David H Wahl, David P. PhilippAbstract:Parental care is an energetically costly period of the life history of many fish species characterized by extended high intensity activity. To date, there have been no studies that have investigated the Cardiovascular correlates of extended parental care in fish. Using Doppler flow probes, the Cardiovascular Performance of six syntopic centrarchid fish species (N=232) that provide sole, male parental care was examined across a range of water temperatures that encompass their reproductive periods (14-26 degrees C). Experiments were restricted to males but included both nesting and non-nesting individuals to evaluate the Cardiovascular Performance of fish during parental care. Resting values for cardiac output (Q) and heart rate (f(H)) tended to be higher for nesting fish when adjusted for variation in temperature. Both of these cardiac variables also increased with water temperature. Stroke volume (V(S)) was similar among nesting and non-nesting fish and was generally thermally insensitive. When exposed to exhaustive exercise, nesting fish took longer to exhaust than non-nesting individuals. The high resting levels found in nesting fish accompanied by only minor increases in maximal values typically resulted in reductions in cardiac scope. Cardiovascular variables recovered more quickly in nesting fish, which could facilitate the high activity and bursting associated with parental care. Interspecifically, several Cardiovascular variables were correlated with parental care activity. Parental care investment became more energetically expensive as the degree of cardiac frequency modulation decreased. Additionally, as the duration of parental care increased, so did the time required for fish to become exhausted, although this relationship was probably influenced by the fact that the larger species (e.g. smallmouth bass Micropterus dolomieu; largemouth bass Micropterus salmoides) provided the lengthiest care. Collectively, these data indicate that fish that provide parental care possess adaptations, including sufficient phenotypic plasticity, such that they can enhance their ability to provide high intensity protracted care, and emphasize the nexus between behavior and physiology.
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Cardiovascular Performance of six species of field acclimatized centrarchid sunfish during the parental care period
The Journal of Experimental Biology, 2010Co-Authors: Steven J. Cooke, Jason F. Schreer, David H Wahl, David P. PhilippAbstract:Parental care is an energetically costly period of the life history of many fish species characterized by extended high intensity activity. To date, there have been no studies that have investigated the Cardiovascular correlates of extended parental care in fish. Using Doppler flow probes, the Cardiovascular Performance of six syntopic centrarchid fish species ( N =232) that provide sole, male parental care was examined across a range of water temperatures that encompass their reproductive periods (14–26°C). Experiments were restricted to males but included both nesting and non-nesting individuals to evaluate the Cardiovascular Performance of fish during parental care. Resting values for cardiac output (![Graphic][1] ) and heart rate ( f H) tended to be higher for nesting fish when adjusted for variation in temperature. Both of these cardiac variables also increased with water temperature. Stroke volume ( V S) was similar among nesting and non-nesting fish and was generally thermally insensitive. When exposed to exhaustive exercise, nesting fish took longer to exhaust than non-nesting individuals. The high resting levels found in nesting fish accompanied by only minor increases in maximal values typically resulted in reductions in cardiac scope. Cardiovascular variables recovered more quickly in nesting fish, which could facilitate the high activity and bursting associated with parental care. Interspecifically, several Cardiovascular variables were correlated with parental care activity. Parental care investment became more energetically expensive as the degree of cardiac frequency modulation decreased. Additionally, as the duration of parental care increased, so did the time required for fish to become exhausted, although this relationship was probably influenced by the fact that the larger species (e.g. smallmouth bass Micropterus dolomieu ; largemouth bass Micropterus salmoides ) provided the lengthiest care. Collectively, these data indicate that fish that provide parental care possess adaptations, including sufficient phenotypic plasticity, such that they can enhance their ability to provide high intensity protracted care, and emphasize the nexus between behavior and physiology. * ANCOVA : analysis of covariance ANOVA : analysis of variance AVM : absolute ventricular mass f H : heart rate PIC : phylogenetically independent contrast ![Graphic][2] : cardiac output rs : Spearman's correlation coefficient RVM : relative ventricular mass V S : stroke volume [1]: /embed/inline-graphic-1.gif [2]: /embed/inline-graphic-45.gif
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Influence of local adaptation and interstock hybridization on the Cardiovascular Performance of largemouth bass Micropterus salmoides.
Journal of Experimental Biology, 2005Co-Authors: Steven J. Cooke, David P. PhilippAbstract:SUMMARY In this study, the Cardiovascular response to exhaustive exercise among differentiated stocks of largemouth bass Micropterus salmoides was compared at 10°C and 20°C to assess the level of their local adaptation. In addition, the impact that interstock hybridization had on adaptive differences was assessed using F 1 hybrids. To accomplish these assessments, four genetically distinct stocks of fish were produced using adults from two regions in the midwestern United States identified as distinct conservation management units (central Illinois, IL and southeastern Wisconsin, WI): both P 1 stocks and both reciprocal F 1 interstock hybrids. Cardiac variables (both resting and maximal) were consistently lowest for the IL×IL stock relative to the WI×WI stock and both F 1 interstock hybrids. Interestingly, however, all groups of fish were able to maintain similar levels of cardiac scope. All fish responded to exercise by increasing heart rate and decreasing stroke volume, consistent with the notion that largemouth bass modulate cardiac output via frequency. After exercise, cardiac variables returned to resting levels 25-35% more rapidly for IL×IL fish relative to all other groups at 20°C. At 10°C, recovery rates for both P 1 stocks were similar but more rapid than the interstock hybrids. Collectively, these results indicate that the locally adapted stock (IL×IL) exhibited Cardiovascular adaptations that enabled rapid Cardiovascular recovery and maintenance of low resting cardiac output and heart rate. Conversely, the translocated stock (WI×WI) and the interstock hybrids required longer for Cardiovascular variables to recover after exercise and exhibited higher resting levels of cardiac output and heart rate. This study provides some of the first direct evidence of a physiological mechanism by which mixing stocks could potentially decrease fitness and illustrates the magnitude of the intraspecific diversity of Cardiovascular Performance.
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Influence of local adaptation and interstock hybridization on the Cardiovascular Performance of largemouth bass Micropterus salmoides.
The Journal of experimental biology, 2005Co-Authors: Steven J. Cooke, David P. PhilippAbstract:In this study, the Cardiovascular response to exhaustive exercise among differentiated stocks of largemouth bass Micropterus salmoides was compared at 10 degrees C and 20 degrees C to assess the level of their local adaptation. In addition, the impact that interstock hybridization had on adaptive differences was assessed using F1 hybrids. To accomplish these assessments, four genetically distinct stocks of fish were produced using adults from two regions in the midwestern United States identified as distinct conservation management units (central Illinois, IL and southeastern Wisconsin, WI): both P1 stocks and both reciprocal F1 interstock hybrids. Cardiac variables (both resting and maximal) were consistently lowest for the IL x IL stock relative to the WI x WI stock and both F1 interstock hybrids. Interestingly, however, all groups of fish were able to maintain similar levels of cardiac scope. All fish responded to exercise by increasing heart rate and decreasing stroke volume, consistent with the notion that largemouth bass modulate cardiac output via frequency. After exercise, cardiac variables returned to resting levels 25-35% more rapidly for IL x IL fish relative to all other groups at 20 degrees C. At 10 degrees C, recovery rates for both P1 stocks were similar but more rapid than the interstock hybrids. Collectively, these results indicate that the locally adapted stock (IL x IL) exhibited Cardiovascular adaptations that enabled rapid Cardiovascular recovery and maintenance of low resting cardiac output and heart rate. Conversely, the translocated stock (WI x WI) and the interstock hybrids required longer for Cardiovascular variables to recover after exercise and exhibited higher resting levels of cardiac output and heart rate. This study provides some of the first direct evidence of a physiological mechanism by which mixing stocks could potentially decrease fitness and illustrates the magnitude of the intraspecific diversity of Cardiovascular Performance.
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Effects of incremental increases in silt load on the Cardiovascular Performance of riverine and lacustrine rock bass, Ambloplites rupestris
Environmental pollution (Barking Essex : 1987), 2004Co-Authors: Christopher M. Bunt, Steven J. Cooke, Jason F. Schreer, David P. PhilippAbstract:Rock bass (Ambloplites rupestris) are a widespread centrarchid species with both riverine and lacustrine populations. After precipitation events, rivers often carry elevated silt loads, where as lakes generally remain free from suspended silt and sediment. To examine the physiological effects of silt on rock bass, we conducted a series of experiments using fish from Lake Opinicon and the Grand River in Ontario. Ultrasonic Doppler flow probes were surgically affixed around the ventral aorta to monitor Cardiovascular Performance. After recovery from surgery replicated treatment groups were exposed to incremental increases in silt load (made from bentonite slurry), while cardiac output and its two components, heart rate and stroke volume, were measured simultaneously. Although both groups of rock bass responded significantly to low concentrations of silt (10 NTU), the response by riverine rock bass was rapidly extinguished by acclimation or physiological adjustment. Compensatory mechanisms to minimize cardiac (and respiratory) disruption attributable to increases in suspended silt appear to be inherent in rock bass of riverine origin. These fish appear to fully compensate for interference in gas exchange at the gill surfaces 60 min after initial exposure. In contrast, individual lacustrine rock bass were highly variable in their response to elevated silt concentrations. Changes in stroke volume and cardiac output suggested no clear compensatory mechanism or strategy to cope with increased silt levels.