Effects of isometric handgrip exercise on Doppler-derived parameters of aortic flow in normal subjects

Bryg, Robert J.; Lewen, Marc K.; Williams, George A.; Labovitz, Arthur J.

doi:10.1016/0002-9149(89)91060-6

Cited by 16 publications

(10 citation statements)

References 12 publications

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“…The responses in stroke volume and in the Dopplerderived indices in the present study were mainly determined by the high blood pressures measured. These left ventricular responses were similar to those observed during isometric exercise (Bryg et al 1989;Sagiv et al 1985). During isometric exercise, it has been reported that afterload is elevated while stroke volume does not increase; rather a marked increase in heart rate has been noted as the factor for maintaining adequate cardiac output (Hossack and Bruce 1982;Sagiv et al 1991).…”

Section: Discussionsupporting

confidence: 82%

“…Therefore, because it has been found that anaerobic exercise increases the adrenergic state, one would expect the left ventricular systolic function to increase (Bryg et al 1989). However, in the present study, in spite of the interaction eects for¯ow velocity integral and acceleration time between the two groups during the Wingate anaerobic test, a signi®cant decrease on aortic¯ow in both groups was noted immediately postexercise.…”

Section: Discussioncontrasting

confidence: 62%

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The effect of gender on left ventricular function immediately after the wingate test

Ben‐Sira

Sagiv

1997

European Journal of Applied Physiology

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The effect of gender on left ventricular systolic function and exercise haemodynamics in healthy young subjects was studied during 30-s all-out sudden strenuous dynamic exercise. A group of 22 men [19.3 (SD 1) years] 20 women [19.1 (SD 1) years] volunteered to participate in this study. Two-dimensional direct M-mode and Doppler echocardiograph studies were performed with the subject in the sitting position. The Doppler examination of flow was located with continuous-wave, interrogating ascending aorta measurements. The subjects completed the study without showing any electrocardiograph abnormalities. An interaction effect with stroke volume (P < 0.05) was characterized by a decrease in the men and an increase of stroke volume in the women. Cardiac output rose significantly (P < 0.05) up to 14.5 (SD 6) 1.min-1) for the men and 12.1 (SD 4) 1.min-1 for the women compared to the rest values [5.8 (SD 0.4) and 4.7 (SD 0.5) 1.min-1, respectively]. Flow velocity integral and acceleration time differed significantly between the two groups at rest (P < 0.05). During exercise these differences showed an interaction effect (P < 0.05). These results would indicate that normal men and women respond to sudden strenuous exercise by reducing their left ventricular systolic function, with a significantly greater decrease in women (P < 0.05). The gender differences in the haemodynamic responses during the present study, may, as suggested by others, be attributable to differences in energy metabolism. In addition, changes in Doppler parameters of aortic flow, haemodynamics and blood pressure responses during sudden strenuous exercise differed markedly from those seen before with endurance exercise.

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Section: Discussionsupporting

confidence: 82%

Section: Discussioncontrasting

confidence: 62%

The effect of gender on left ventricular function immediately after the wingate test

Ben‐Sira

Sagiv

1997

European Journal of Applied Physiology

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“…The following parameters were calculated: (l)m ean arterial blood pressure (MABP) = 1/3 (sys tolic blood pressure -diastolic blood pressure) + dia stolic blood pressure; (2) stroke volume (SV) = aortic valve area-flow velocity integral; (3 )cardiac output (Q) = heart rate-SV; (4) total peripheral resistance [15] = (MABP-80)/Q; (5) rate pressure product = heart rate-systolic blood pressure, and (6) left ventricular ejection indices were determined according to the method ofTeichholz et al [14]. …”

Section: Calculationsmentioning

confidence: 99%

Effects of Chronic Overload Training and Aging on Left Ventricular Systolic Function

Sagiv

Sagiv²,

Ben‐Sira³

et al. 1997

Gerontology

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To examine the effects of age and chronic overload training on left ventricular systolic function during static exercise, Doppler echocardiography studies were performed in 14 young (28 ± 6 years) and 10 older (51 ± 3 years) weight lifters and also in 14 young (29 ± 6 years) and 10 older (52 ± 1.1 years) normal individuals during upright dead-lift isometric exercise, at 30% of maximal voluntary contraction for 3 min. At rest, older weight lifters demonstrated impaired left ventricular systolic function as compared with the other three groups. During exercise, peak and mean velocity values increased significantly (p < 0.05) from resting values in the young groups, but remained unchanged in the older groups. Flow period and acceleration and deceleration times were significantly (p < 0.05) lower in the younger subjects than those observed for the old ones, with the highest (p < 0.05) values obtained by the old weight lifters. This study suggests that the differences between the groups are related to differences in impedance and not to fundamental changes in the properties of the myocardium.

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“…These results are different from what one would expect to find with increased adrenergic state during isodynamic exercise due to the isometric component. Previous studies Sagiv/Ruddoy/Sagiv/Ben-Gal/Ben-Sira [9,10] reported a significant decrease in systolic function parameters during handgrip isometric exercise. Others [11], using phenylephrine to increase blood pressure in open-chest dogs, have shown that although the afterload was increased during isometric testing, it did not significantly influence Doppler-derived indices.…”

Section: Discussionmentioning

confidence: 90%

Effect of Changes in Load Carriage while Walking on the Left Ventricular Function in Highly Trained Elderly Subjects

et al. 2002

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Background: In previous studies, the effect of isometric stress on the dynamic performance of a graded exercise test in normal subjects augmented afterload and brought about changes in left ventricular function more often than did results from physical exercise. Objective: This study used the metabolic charts and echocardiography to examine the influence of two different types of load carriage during 30 min of treadmill walking on left ventricular function, hemodynamics, and cardiovascular responses. Methods: Fifteen elderly (age 66.1 ± 3.5 years) aerobically well-trained male subjects (VO_{2 peak} 44.2 ± 5.0 ml·kg^–1·min^–1) volunteered in this study. The subjects walked on a treadmill (at a speed of 4.5 km·h^–1), carrying a load of 20 kg during one session and a load of 30 kg during a second session. Results: Following the 30-min exercise in each session, significant (p < 0.05) differences were noted between the 20-kg and the 30-kg work loads with regard to cardiac output (6.8 ± 0.5 and 7.8 ± 0.4 l·min^–1), heart rate (114.0 ± 11.0 and 126.0 ± 10.0 beats·min^–1), diastolic blood pressure (79.4 ± 5.0 and 84.3 ± 5.0 mm Hg, mean arterial blood pressure (104.0 ± 4.0 and 109.2 ± 3.0 mm Hg), and left ventricular contractility ratio (3.3 ± 0.4 and 3.6 ± 0.3). No significant differences were noted between the work loads with regard to systolic blood pressure, cardiac output, left ventricular volumes, and ejection fraction. Conclusions: This study suggests that in the highly trained elderly, the influence of the autoregulation mechanism dominates during combined dynamic and isometric exercises, thus the opposing force to the left ventricular ejection is reduced which in turn does not change left ventricular global function.

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Effects of isometric handgrip exercise on Doppler-derived parameters of aortic flow in normal subjects

Cited by 16 publications

References 12 publications

The effect of gender on left ventricular function immediately after the wingate test

The effect of gender on left ventricular function immediately after the wingate test

Effects of Chronic Overload Training and Aging on Left Ventricular Systolic Function

Effect of Changes in Load Carriage while Walking on the Left Ventricular Function in Highly Trained Elderly Subjects

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