Increased cardiovascular response to static contraction of larger muscle groups

Abstract

The purpose of this study was to investigate the influence of the size of the active muscle mass on the cardiovascular response to static contraction. Twelve male subjects performed one-arm handgrip (HG), two-leg extension (LE), and a "dead-lift" maneuver (DL) in a randomly assigned order for 3 min at 30% of maximal voluntary contraction. O2 uptake (VO2), heart rate (HR), and mean intra-arterial blood pressure (MABP) were measured at rest and, in addition to absolute tension exerted, throughout contraction. There was a direct relationship between the size of the active muscle mass and the magnitude of the increases in VO2, HR, and MABP, even though all contractions were performed at the same relative intensity. Tension, VO2, HR, and MABP increased progressively from HG to LE to DL. It was concluded that at the same percentage of maximal voluntary contraction, the magnitude of the cardiovascular response to isometric exercise is directly influenced by the size of the contracting muscle mass.

Cardiorespiratory Response to Dynamic and Static Leg Press Exercise in Humans

“…If we exclude the effect of the one-or two-legged issue which determines the blood pressure and HR responses to static contraction, the size of active muscle mass or the percentage of MVC should be considered here. Many studies have discussed this issue comparing the responses in different parts of the body or only in small muscle masses McCloskey and Streatfield, 1975;Mitchel et al, 1980;Seal et al, 1983). However, based on this research, it should be recognized that the magnitude of VO 2 and HR depend on the percentage of MVC when the active muscle mass is the same and vice versa.…”

Respostas hemodinâmicas a um protocolo de treinamento isométrico de preensão manual

“…Recent physiological studies, with the quantification of some of the cardiorespiratory responses to predominantly static exercises using small and different muscle groups and with different percentages of maximal voluntary strength, have contributed to a better understanding of the mechanisms associated with IHT and similar exercises 14,15,[33][34][35][36][37] . Nevertheless, when these physiological data, respecting the methodological differences and small samples involved, are compared with our results, one can identify a 13 .…”

“…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.…”

Influência do grupamento muscular na recuperação da frequência cardíaca após o exercício resistido

“…The involvement of a smaller muscle group and reduced vascular tree of the bench press exercise promotes higher accumulation of metabolites, stimulating hence III and IV muscular afferents, causing HR increase through the activity of the muscle mechano and metaboreflex systems 28 . This factor would compensate the greater muscle group used by the half squat and the higher participation of accessory and synergic muscles, which cause HR increase through higher excitement of the motor cortex 29 . However, the methods used by the present study do not let us confirm such theories.…”