Circulatory responses to sustained hand‐grip contractions performed during other exercise, both rhythmic and static

Lind, A. R.; McNicol, G. W.

doi:10.1113/jphysiol.1967.sp008319

Cited by 182 publications

(83 citation statements)

References 9 publications

(17 reference statements)

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“…Since Petrofsky & Lind (1980) changed the frequency of stimulation as well as the anodal block in their experiments, it may be that their finding of a larger pressor response is due to activation of a larger muscle mass. Even though earlier studies had indicated that the cardiovascular response was independent of the skeletal muscle mass active in the static contraction (Lind & McNicol, 1967), more recent findings have shown that the cardiovascular response is greater when a larger muscle mass is involved (Mitchell, Payne, Saltin & Schibye, 1980;Seals, Washburn, Hanson, Painter & Nagle, 1983).…”

Section: B Leonard and Others B Effect Of Tubocurarinementioning

confidence: 86%

Partial neuromuscular blockade and cardiovascular responses to static exercise in man.

Leonard¹,

Mitchell²,

Mizuno³

et al. 1985

The Journal of Physiology

112

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SUMMARY1. In human subjects sustained static contractions of the quadriceps femoris in one leg were performed with the same absolute and the same relative intensity before and after partial neuromuscular blockade with either decamethonium or tubocurarine which reduced strength to about 50 % of the control value. During the contractions performed with the same absolute force, the magnitude of the cardiovascular responses (heart rate and blood pressure) was greater during neuromuscular blockade than during control contractions. During the contractions involving the same relative force the magnitude of the cardiovascular responses was almost the same with and without neuromuscular blockade. These findings were independent of the drug used.2. The metabolic part of the exercise pressor reflex was assessed by the application of an arterial cuff I min before cessation of exercise and for the following 3 min of rest. Although heart rate and blood pressure decreased after cessation of exercise, application of the tourniquet resulted in higher post-exercise values and this effect was seen both with and without neuromuscular blockade.3. Muscle biopsies from the subjects' m. vastus lateralis were analysed for fastand slow-twitch fibre composition showing 27-66 % slow-twitch fibres. No correlation was found between cardiovascular responses to static exercise, with or without neuromuscular blockade, and fibre type predominance. 4. The results suggest that the involvement of fast-or slow-twitch muscle fibres does not play a dominant role in the cardiovascular responses to static exercise in man. Both central command and reflex neural mechanisms are of importance, and it appears that these two control mechanisms are redundant and that neural occlusion may be operative. However, when partial neuromuscular blockade induces a disproportion between an increase in central command and a constant or decreasing muscle tension and metabolism, the larger signal arising from central command determines the magnitude of the cardiovascular responses.

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Section: B Leonard and Others B Effect Of Tubocurarinementioning

confidence: 86%

Partial neuromuscular blockade and cardiovascular responses to static exercise in man.

Leonard¹,

Mitchell²,

Mizuno³

et al. 1985

The Journal of Physiology

112

View full text Add to dashboard Cite

show abstract

“…For example, when two or more muscle groups contract at the same proportion of their maximal tension, the increments in blood pressure and heart rate are the same whether they contract separately or together (Lind & McNicol, 1967). Or, when two or more muscle groups contract simultaneously at different relative tensions, the increments in heart rate and blood pressure are the same as when the muscle group at the higher relative tension contracts alone at that tension (Lind & McNicol, 1967). These findings hold true even when the muscle groups involved are of quite different total mass.…”

Section: Introductionmentioning

confidence: 99%

Muscular reflex stimuli to the cardiovascular system during isometric contractions of muscle groups of different mass.

McCloskey¹,

Streatfeild²

1975

The Journal of Physiology

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SUMMARY1. The cardiovascular responses to voluntary isometric contractions performed by human subjects are determined by the proportion of maximal tension achieved by the muscles contracting, and not by the mass of the contracting muscles, nor by the absolute tension achieved (Lind & McNicol, 1967; confirmed here). When two or more muscle groups contract simultaneously at different relative tensions, the increments in heart rate and blood pressure are the same as when the muscle group at the higher relative tension contracts alone at that tension (Lind & McNicol, 1967). It is known that there are both central and reflex stimuli to the cardiovascular system in exercise, and the present study examines whether the muscular reflex stimuli are related to the proportion of maximal tension achieved or to the mass of contracting muscle. 3. When human subjects perform isometric contractions, a pressor response can be maintained beyond the conclusion of the exercise by occluding muscle blood flow. This response is generally attributed to a reflex set up in the muscle by the action of chemical factors on afferent nerves. When comparable pressor responses were evoked by comparable proportional efforts with either the whole hand or the little finger, it was found here that the pressor responses remaining during the period of post-exercise occlusion were greater when the greater mass of muscle had been exercised.4. It is concluded that the muscular reflex drive in isometric exercise is related to the bulk of contracting muscle.

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“…This effect results in a weak acceleration of HR, and there is no significant mobilization of the flow. Consequently, peripheral resistances increase because of the constant contraction of the muscles, especially when the intensity of this one is higher than 15% of the FMV [22].…”

Section: Blood Pressurementioning

confidence: 99%

Effects of Voluntary Apnea on Haemodynamic Responses during Groundwork Techniques of Judo

Moulongo¹,

Massamba²,

Alphonse³

et al. 2016

WJCD

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Context: Several studies were conducted on physiology of apnea in scuba diving. No survey has been reported in fighting sports. Objective: To evaluate cardiovascular variations misled by voluntary apnea during groundwork techniques of judo training. Methods: The temporal evolution of heart rate and modifications of the blood pressure have been investigated during cross sectional and experimental study. A total of 28 Congolese judoists took part in the study. The voluntary apnea was achieved by a judoist to try to carry out two kinds of groundwork (hon-gesa-gatame and kami-shiho-gatame). According to the case, Student t test and analysis of variance were used for comparing data. Multivariate analysis was used to evaluate the effect of "type of groundwork technique × category of weight". Results: Between 0 and 3 seconds, tachycardia has been observed during the static groundwork techniques and then bradycardia occurred to 3 -9 seconds for the dynamic groundwork techniques : +6.8% of the rest frequency versus -9.4% for hon-gesa; +4.9% versus −13.7% for kami-shiho. Thereafter, it followed a fluctuation of heart rate of 9 -15 seconds. Beyond, a stagnation was noted for hon-gesa, whereas a minimal increase (<5%) for kami-shiho. In relation to the systolic arterial pressure, a meaningful rise was recovered: +46.5% (hon-gesa) versus +50.1% (kami-shiho) in static exercise; +43.4% (hon-gesa) versus +43.3% (kami-shiho) in dynamic exercise. The report was similar for the diastolic arterial pressure: +31.5% (hon-gesa) versus 30.0% (kami-shiho) in static exercise; +20.3% (hon-gesa) versus +23.8% (kami-shiho) in dynamic exercise. 301nique to judo drags bradycardia increased while exercise realized static posture, and a rise of the arterial pressure.

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Circulatory responses to sustained hand‐grip contractions performed during other exercise, both rhythmic and static

Cited by 182 publications

References 9 publications

Partial neuromuscular blockade and cardiovascular responses to static exercise in man.

Partial neuromuscular blockade and cardiovascular responses to static exercise in man.

Muscular reflex stimuli to the cardiovascular system during isometric contractions of muscle groups of different mass.

Effects of Voluntary Apnea on Haemodynamic Responses during Groundwork Techniques of Judo

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