Cardiovascular Response of Human Subjects to Isometric Contraction of Large and Small Muscle Groups

Riendl, Anne M.; Gotshall, Robert W.; Reinke, Jill A.; Smith, James J.

doi:10.3181/00379727-154-39630

Cited by 20 publications

(10 citation statements)

References 4 publications

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“…There were no differences in the peak heart rates achieved during these contractions either. The blood pressure results are similar to previous studies (Lind & McNicol, 1967;McCloskey & Streatfeild, 1975;Reindl, Gotshall, Reinke & Smith, 1977;Imms & Mehta, 1989). The endurance time for our subjects for the handgrip contractions at 70 % MVC was close to 46 s and for the quadriceps contraction, close to 53 s. Because these endurance times were not significantly different, the contraction time is not a variable in this study.…”

Section: Discussionsupporting

confidence: 91%

Effect of muscle mass on the pressor response in man during isometric contractions.

Williams

1991

The Journal of Physiology

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SUMMARY1. Changes in blood pressure and heart rate were measured in six healthy male subjects during voluntary isometric contractions of the forearm and quadriceps muscles. Arterial pressure was measured directly via a catheter inserted into the radial artery of the non-contracting arm. Each subject exerted two types of contractions: (a) sustained contractions at 70 % of the maximum voluntary contraction (MVC) until fatigue occurred and (b) sustained contractions starting at maximum tension (100% MVC), held for a total duration of 1 min.2. During fatiguing contractions at 70 % MVC, there was a progressive increase in blood pressure, reaching a peak level at fatigue. The same level of mean arterial pressure was achieved during contractions of the same relative tension, regardless of the muscle mass. The same trend was observed for the changes in heart rate.3. During contractions which started with the maximum tension, where tension fell continuously during the 60 s of maximal effort, mean arterial pressure rapidly increased to high levels within a few seconds, and then increased further by 20-30 mmHg during the sustained maximal effort. There was no difference in the initial rapid increases in mean arterial pressure, nor in the final mean arterial pressures reached between contractions of the forearm or quadriceps muscles. There were no differences in the heart rates achieved during these contractions either.4. There was no significant difference between the mean arterial pressures observed at fatigue of a 70 % MVC contraction or at the end of the 60 s maximum effort during handgrip contractions, or during contractions with the quadriceps muscles.5. These results support the view that muscle mass is not a determinant of the magnitude of the cardiovascular reflexes during fatiguing isometric contractions in man.

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Section: Discussionsupporting

confidence: 91%

Effect of muscle mass on the pressor response in man during isometric contractions.

Williams

1991

The Journal of Physiology

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“…We experimentally increased the systemic BP, and consequently the OPP, through an isometric handgrip exercise that produces active stimulation of the sympathetic system through activation of mechanoreceptors during the increased muscle tension. [37][38][39] During this stress condition, there was a significant increase of SBP, DBP, MAP, HR, and OPP in both groups of the study. The baseline values of SBP and DBP were significantly higher in patients with CSCR; during the exercise, they reached values definitely in the range of hypertension (mean SBP ¼ 165.57 mm Hg, mean DBP ¼ 105.60 mm Hg).…”

Section: Discussionmentioning

confidence: 99%

Choroidal Vascular Reactivity in Central Serous Chorioretinopathy

Piccolino

Lupidi

Cagini

et al. 2018

Invest. Ophthalmol. Vis. Sci.

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METHODS. For this multicenter, observational, case-control study, we enrolled 35 patients with an established diagnose of CSCR and 25 age-matched healthy controls. All subjects underwent a handgrip isometric exercise to obtain elevation of blood pressure (BP). In the resting phase and during the physical effort, macular OCT-angiograms were acquired. Systemic hemodynamic data were recorded at baseline and during stress conditions using an electronic sphygmomanometer. The analysis of vascular density (VD) of the choriocapillaris (CC) was performed on OCT-angiograms. The results obtained in CSCR patients, both at baseline and during the stress test, were compared with those of healthy subjects. RESULTS.Baseline and under stress values of systolic BP, diastolic BP, and mean arterial pressure were significantly higher (P < 0.05) in CSCR patients compared to controls, reaching values in the range of hypertension during the exercise. Baseline VD values of the CC were significantly lower (P < 0.05) in CSCR cases compared to healthy subjects. We noticed a significant increase (P < 0.05) in these values under stress condition in CSCR patients and not in controls.CONCLUSIONS. The present study suggests that choroidal blood flow is dysregulated in CSCR. During physical stress, CSCR patients easily reach critical values of BP that are not dampened by compensatory mechanisms in the choroidal vessels, as it happens in healthy subjects. The CC in CSCR could be particularly vulnerable to variations of systemic hemodynamics.

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“…The relative consistency of the haemodynamic changes which occur during the isometric handgrip exercise test, indicates that it is a simple and a reliable method for studying the cardiovascular response to stress [12]. Lifestyle modifications like an increased physical activity, salt restriction and weight reduction, are effective for the prevention and the treatment of hypertension [3,13].…”

Section: Physiology Sectionmentioning

confidence: 99%

The Isometric Handgrip Exercise As a Test for Unmasking Hypertension in the Offsprings of Hypertensive Parents

Garg

Malhotra²,

Dhar³

et al. 2013

JCDR

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Background: A familial history of hypertension increases the risk of hypertension in the offsprings. Aims and objectives:The present study was undertaken to assess the underlying hypertension by using the Isometric Handgrip (IHG) exercise test in the offsprings of hypertensive parents and to compare it with age-matched controls of normotensive parents. Material and Methods:The isometric handgrip test was performed in the study and control groups. The resting blood pressure was recorded before exercise and afterwards the subjects were asked to perform the isometric handgrip exercise with the dominant hand for 2 minutes. Then the blood pressure was recorded in the sitting position during and 5 minutes after the completion of the exercise.Statistical Analysis: The analysis of the results was done by ANOVA with SPSS, version 17.0, by using the unpaired 't' test. Results:The results showed that the Resting Systolic (SBP), Diastolic (DBP) and the Mean (MBP) Blood Pressures were higher (p <0.001) in the offsprings of the hypertensive parents as compared to those in the control subjects of normotensive parents. During the isometric handgrip exercise test, the rise in the systolic, diastolic and the mean blood pressures was significantly higher (p<0.001) in the offsprings of the hypertensive parents. After 5 minutes of exercise, the SBP, DBP and the MBP were found to be significantly higher (p<0.001) in the study group as compared to those in the control group.Conclusions: An early and a regular screening of the children of hypertensive parents is necessary to prevent any future cardiovascular complications.

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Cardiovascular Response of Human Subjects to Isometric Contraction of Large and Small Muscle Groups

Cited by 20 publications

References 4 publications

Effect of muscle mass on the pressor response in man during isometric contractions.

Effect of muscle mass on the pressor response in man during isometric contractions.

Choroidal Vascular Reactivity in Central Serous Chorioretinopathy

The Isometric Handgrip Exercise As a Test for Unmasking Hypertension in the Offsprings of Hypertensive Parents

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