Heat stress attenuates the increase in arterial blood pressure during isometric handgrip exercise

2012 ◽  
Vol 113 (1) ◽  
pp. 183-190 ◽  
Author(s):  
Konrad Binder ◽  
Daniel Gagnon ◽  
Aaron G. Lynn ◽  
Narihiko Kondo ◽  
Glen P. Kenny
Keyword(s):  
Blood Pressure ◽  
Heat Stress ◽  
Arterial Blood Pressure ◽  
Handgrip Exercise ◽  
Isometric Handgrip ◽  
Arterial Blood ◽  
Isometric Handgrip Exercise

scholarly journals Reductions in Resting Blood Pressure in Young Adults When Isometric Exercise Is Performed Whilst Walking

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Anthony W. Baross ◽  
David A. Hodgson ◽  
Sarah L. Padfield ◽  
Ian L. Swaine
Keyword(s):  
Blood Pressure ◽  
Young Adults ◽  
Isometric Exercise ◽  
Handgrip Exercise ◽  
Isometric Handgrip ◽  
Isometric Training ◽  
Arterial Blood ◽  
Resting Blood Pressure ◽  
Before And After ◽  
Isometric Handgrip Exercise

Aerobic and isometric training have been shown to reduce resting blood pressure, but simultaneous aerobic and isometric training have not been studied. The purpose of this study was to compare the changes in resting systolic (SBP), diastolic (DBP), and mean arterial blood pressure (MAP) after 6 weeks of either (i) simultaneous walking and isometric handgrip exercise (WHG), (ii) walking (WLK), (iii) isometric handgrip exercise (IHG), or control (CON). Forty-eight healthy sedentary participants (age 20.7 ± 1.7 yrs, mass 67.2 ± 10.2 kg, height 176.7 ± 1.2 cm, male n=26, and female n=22) were randomly allocated, to one of four groups (n=12 in each). Training was performed 4 × week−1 and involved either treadmill walking for 30 minutes (WLK), handgrip exercise 3 × 10 s at 20% MVC (IHG), or both performed simultaneously (WHG). Resting SBP, DBP, and MAP were recorded at rest, before and after the 6-week study period. Reductions in resting blood pressure were significantly greater in the simultaneous walking and handgrip group than any other group. These results show that simultaneous walking and handgrip training may have summative effects on reductions in resting blood pressure.

scholarly journals BLOOD PRESSURE RESPONSE TO ISOMETRIC HANDGRIP EXERCISE IN DIABETIC PATIENTS WITHOUT ESTABLISHED CVD

2019 ◽  
Vol 37 ◽  
pp. e141
Author(s):  
A. Triantafyllou ◽  
K. Dipla ◽  
N. Koletsos ◽  
S. Papadopoulos ◽  
I. Zografou ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Pressure Response ◽  
Pressure Response ◽  
Diabetic Patients ◽  
Handgrip Exercise ◽  
Isometric Handgrip ◽  
Isometric Handgrip Exercise

Cardiopulmonary baroreceptor control of muscle sympathetic nerve activity in heat-stressed humans

1999 ◽  
Vol 277 (6) ◽  
pp. H2348-H2352 ◽  
Author(s):  
C. G. Crandall ◽  
R. A. Etzel ◽  
D. B. Farr
Keyword(s):  
Blood Pressure ◽  
Heat Stress ◽  
Arterial Blood Pressure ◽  
Sympathetic Nerve ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Venous Pressure ◽  
Whole Body ◽  
Nerve Activity ◽  
Arterial Blood

Whole body heating decreases central venous pressure (CVP) while increasing muscle sympathetic nerve activity (MSNA). In normothermia, similar decreases in CVP elevate MSNA, presumably via cardiopulmonary baroreceptor unloading. The purpose of this project was to identify whether increases in MSNA during whole body heating could be attributed to cardiopulmonary baroreceptor unloading coincident with the thermal challenge. Seven subjects were exposed to whole body heating while sublingual temperature, skin blood flow, heart rate, arterial blood pressure, and MSNA were monitored. During the heat stress, 15 ml/kg warmed saline was infused intravenously over 7–10 min to increase CVP and load the cardiopulmonary baroreceptors. We reported previously that this amount of saline was sufficient to return CVP to pre-heat stress levels. Whole body heating increased MSNA from 25 ± 3 to 39 ± 3 bursts/min ( P < 0.05). Central blood volume expansion via rapid saline infusion did not significantly decrease MSNA (44 ± 4 bursts/min, P > 0.05 relative to heat stress period) and did not alter mean arterial blood pressure (MAP) or pulse pressure. To identify whether arterial baroreceptor loading decreases MSNA during heat stress, in a separate protocol MAP was elevated via steady-state infusion of phenylephrine during whole body heating. Increasing MAP from 82 ± 3 to 93 ± 4 mmHg ( P < 0.05) caused MSNA to decrease from 36 ± 3 to 15 ± 4 bursts/min ( P < 0.05). These data suggest that cardiopulmonary baroreceptor unloading during passive heating is not the primary mechanism resulting in elevations in MSNA. Moreover, arterial baroreceptors remain capable of modulating MSNA during heat stress.

Chemoreflex and metaboreflex control during static hypoxic exercise

2005 ◽  
Vol 288 (4) ◽  
pp. H1724-H1729 ◽  
Author(s):  
Anne Houssiere ◽  
Boutaina Najem ◽  
Agniezka Ciarka ◽  
Sonia Velez-Roa ◽  
Robert Naeije ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Sympathetic Nerve Activity ◽  
Muscle Sympathetic Nerve Activity ◽  
Circulatory Arrest ◽  
Handgrip Exercise ◽  
Isometric Handgrip ◽  
Isometric Handgrip Exercise ◽  
Baseline Values ◽  
Hypoxic Exercise

To investigate the effects of muscle metaboreceptor activation during hypoxic static exercise, we recorded muscle sympathetic nerve activity (MSNA), heart rate, blood pressure, ventilation, and blood lactate in 13 healthy subjects (22 ± 2 yr) during 3 min of three randomized interventions: isocapnic hypoxia (10% O2) (chemoreflex activation), isometric handgrip exercise in normoxia (metaboreflex activation), and isometric handgrip exercise during isocapnic hypoxia (concomitant metaboreflex and chemoreflex activation). Each intervention was followed by a forearm circulatory arrest to allow persistent metaboreflex activation in the absence of exercise and chemoreflex activation. Handgrip increased blood pressure, MSNA, heart rate, ventilation, and lactate (all P < 0.001). Hypoxia without handgrip increased MSNA, heart rate, and ventilation (all P < 0.001), but it did not change blood pressure and lactate. Handgrip enhanced blood pressure, heart rate, MSNA, and ventilation responses to hypoxia (all P < 0.05). During circulatory arrest after handgrip in hypoxia, heart rate returned promptly to baseline values, whereas ventilation decreased but remained elevated ( P < 0.05). In contrast, MSNA, blood pressure, and lactate returned to baseline values during circulatory arrest after hypoxia without exercise but remained markedly increased after handgrip in hypoxia ( P < 0.05). We conclude that metaboreceptors and chemoreceptors exert differential effects on the cardiorespiratory and sympathetic responses during exercise in hypoxia.

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