<i>Comparison of Effects of Static and Dynamic Work on Blood Pressure and Heart Rate</i>

Tuttle, W. W.; Horvath, Steven M.

doi:10.1152/jappl.1957.10.2.294

Cited by 58 publications

(15 citation statements)

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“…' The present study extends the range of the correlation between hemodynamic predictors and MVO2 in normal young men when the blood pressure is the major variable changed. Isometric exercise was chosen as the method of altering blood pressure since it is a common form of stress characterized by marked increases in systolic blood pressure and heart rate with only modest increases in cardiac output, 6 12 in contrast to dynamic exercise which is characterized by marked increases in cardiac output and heart rate with only modest increases in systolic blood pressure. Daily exertion commonly includes components of both isometric and dynamic muscular contraction.…”

Section: Additional Indexing Wordsmentioning

confidence: 99%

Hemodynamic Predictors of Myocardial Oxygen Consumption During Static and Dynamic Exercise

et al. 1974

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Hemodynamic predictors of myocardial oxygen consumption (MVO 2 ) during static and dynamic exercise were examined in ten normal subjects. Studies were done under the following circumstances: 1) during upright bicycle exercise at an average heart rate of 147 beats/min, 2) during static exercise with an isometric load in the left hand equal to 17% of the maximal voluntary contraction (MVC), and 3) during combined dynamic exercise (average heart rate 147 beats/min) and static exercise using 17% MVC of the left hand. Mean myocardial blood flow (MBF) was 181 ml/100 gm LV/min during dynamic exercise, 98 ml/100 gm LV/min during static exercise, and 201 ml/100 gm LV/min during combined static and dynamic exercise. Addition of a static load to the dynamic load resulted in a higher blood pressure (average 12 mm Hg), MVO 2 and MBF than during dynamic exercise alone. MVO 2 correlated best with products of heart rate and blood pressure regardless of whether the blood pressure was obtained by a central aortic catheter ( r = 0.88) or by a blood pressure cuff ( r = 0.85). When the current data were combined with previous data, 82 determinations of MVO 2 and MBF in 29 normal subjects during several levels of upright exercise were available for analysis. Forty-four determinations were done during dynamic upright exercise, 18 during exercise after propranolol, ten during combined static and dynamic work, and ten during static work alone. MVO 2 correlated best with the product of heart rate and blood pressure ( r = 0.86). Heart rate alone correlated better with MVO 2 ( r = 0.82) than did the tension time index ( r = 0.65) or the product of systolic blood pressure, heart rate, and ejection time ( r = 0.68). The readily measured variables of heart rate and of heart rate x blood pressure correlated well with MVO 2 in normal young men during exercise under a wide variety of circumstances.

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Section: Additional Indexing Wordsmentioning

confidence: 99%

Hemodynamic Predictors of Myocardial Oxygen Consumption During Static and Dynamic Exercise

et al. 1974

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“…Static (isometric) contraction elicits an abrupt and dramatic increase in systolic, diastolic, and mean blood pressures (Lind et al, 1964;Seals et al, 1983a,b,c;Tuttle et al, 1957). Heart rate is also elevated, although only moderately (Lind et al, 1964;Seals ef al., 1983a,b,c;Tuttle ef al., 1957).…”

Section: Introductionmentioning

confidence: 99%

Cardiovascular response to static contraction in borderline hypertension

et al. 1985

Clinical Cardiology

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Summary: Nine young males with borderline hypertension (BH) (mean agef SD, 25 f5 yr) and 13 young male normotensive controls (NT) (24f3 yr) were studied to determine their cardiovascular responses to small and large muscle static contractions. The subjects performed onearm handgrip and two-leg extension in a randomly assigned order for 3 min at 30 % of maximal voluntary contraction. Mean intra-arterial blood pressure (MABP), heart rate (HR), and tension were measured throughout the contractions. Borderline hypertensive patients had a higher MABP at rest (p<0.005) and at the end of both types of static contractions (p <0.05). The average increases in MABP from rest to the end of exercise (AMABP) were slightly greater for the BH patients (6 mmHg), but these differences were not significant (p > 0.1). However, a greater percentage of BH patients were hyperreactive to handgrip (ABP > 35 mmHg) and leg extension (ABP >40 mmHg) when compared to controls. These data indicate that, in general, young men with borderline hypertension demonstrate normal cardiovascular regulation in response to static contraction, but that a portion of this population may be hyperreactive to this type of circulatory stress.

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“…Intense muscle activation is accompanied by pronounced and rapidly occurring increases in arterial pressure and heart rate, the initial phase being of neurogenic origin (Tuttle & Horvath, 1957;Lind, Taylor, Humphreys, Kenelly & Donald, 1964;Freyschuss, 1970;Delius, Hagbarth, Hongell & Wallin, 1972;Eklund, Kaijser & Knutsson, 1974). Its effect on vascular resistance in a peripheral vascular bed was analysed by Eklund et al (1974) by measuring arterial pressure and blood flow in the resting forearm during contralateral handgrip.…”

Section: Introductionmentioning

confidence: 99%

Blood flow in the resting forearm during prolonged contralateral isometric handgrip at maximal effort

Eklund

Kaijser

1978

The Journal of Physiology

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SUMMARY1. In earlier studies we have shown that muscle contraction performed as handgrip at constant force, one third of maximal voluntary contraction (MVC), induces a rapid vasodilation in the resting contralateral forearm which in all probability is neurogenically mediated, followed by a relative increase in resistance.2. The maintenance of contraction at one third MVC for 2 min requires continuously increasing effort because of fatigue, as also evidence by the e.m.g. The biphasic response of the vascular bed may then be related to the increasing intensity of somatomotor activation which is needed to maintain contraction force, or, alternatively, to differences in vasomotor activity on initiation of and continued muscle activity.3. To elucidate these two possibilities blood flow in the resting forearm was measured during contralateral handgrips at constant maximal effort for 6 min (in which case force will drop) and compared to handgrip at constant force, one third MVC, for 2 min.4. The flow reaction during prolonged contraction at maximal effort was similar to that induced by contraction at constant force with a marked transient lowering of vascular resistance, although maximal vasodilation tended to be more pronounced and occur earlier.5. The results indicate that the rapid decrease in vascular resistance is related primarily to the initiation of somatomotor activity, whereas continued muscle contraction produces a relative increase in vasoconstrictor activity irrespective of changes in contraction effort.

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Comparison of Effects of Static and Dynamic Work on Blood Pressure and Heart Rate

Cited by 58 publications

References 0 publications

Hemodynamic Predictors of Myocardial Oxygen Consumption During Static and Dynamic Exercise

Hemodynamic Predictors of Myocardial Oxygen Consumption During Static and Dynamic Exercise

Cardiovascular response to static contraction in borderline hypertension

Blood flow in the resting forearm during prolonged contralateral isometric handgrip at maximal effort

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