Effects of isometric handgrip training among people medicated for hypertension: a multilevel analysis

Abstract

These results provide further evidence that IHG training lowers resting blood pressure among persons medicated for hypertension.

Respostas hemodinâmicas a um protocolo de treinamento isométrico de preensão manual

“…Future guidelines of the Brazilian Society of Cardiology (SBC) on the subject of physical exercise might include this type of training as potentially helpful in reducing blood pressure levels and producing favorable vascular and autonomic changes, as it has been well documented in the current medical literature 19,21,22,24,43 .…”

“…Using the most common IHT protocol 19 , patients then performed a maximal handgrip exertion with the right hand and after 10 seconds, they repeated it with the left hand in digital equipment suitable for IHT (Zone, USA). One minute after this measurement, patients were instructed to perform four successive series of two minutes each, exactly 1 minute apart, alternating hands, keeping an intensity corresponding to 30% of the maximum, more easily adjusted by the information continuously available on the equipment display 21 .…”

“…The hemodynamic behavior during isometric exercise has been the object of physiological studies since the mid-1970s [12][13][14][15] ; however, in the last ten years, Canadian researchers have been using what was called the "Isometric Handgrip Training" (IHT) [16][17][18][19][20][21][22] . With few exceptions 19 the IHT involves obtaining a maximum value bilaterally for handgrip strength, followed by two 2-minute duration series for each hand, alternating sides of body, comprising a total of 8 minutes of effective isometric exercise and a total time, considering the intervals and the initial measurements of maximum strength, which must be repeated at each session, of approximately 12 to 13 minutes.…”

“…With few exceptions 19 the IHT involves obtaining a maximum value bilaterally for handgrip strength, followed by two 2-minute duration series for each hand, alternating sides of body, comprising a total of 8 minutes of effective isometric exercise and a total time, considering the intervals and the initial measurements of maximum strength, which must be repeated at each session, of approximately 12 to 13 minutes.…”

Study of Sympathetic Autonomic Functions in Stage 1 Essential Hypertensive Subjects

“…So there is initiation of themetaboreflex in an attempt to restore blood flow, since isometric contractionsimpair blood flow even at low intensity levels. 13 There is increase in metabolites like lactic acid and adenosine which are detected by metabolic sensitive nerve endings within the skeletal muscle interstitium. These substances increase the discharge of group IV (metaborecetors) afferent fibers and initiate a potent reflex increasing sympathetic nerve activity.…”