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PubMed1990

The mechanical efficiency of front crawl swimming.

In this study the gross efficiency of swimming was determined in a group of male (N = 6) and female (N = 4) competitive swimmers. The gross efficiency is defined as the ratio of the power output (W) to the power input (W). In a range of swimming velocities (0.95-1.6 m.s-1), the power input (rate of energy expenditure, 445-1137 W) was calculated from the oxygen uptake values (1.33-3.25 1 O2.min-1). The total power output (26-108 W) was directly measured during front crawl swimming using a system of underwater push-off pads instrumented with a force transducer (MAD-system). Using the MAD-system, the effect on total body drag due to the addition of the respiratory apparatus was evaluated to be negligible. The gross efficiency ranged from 5 to 9.5%. At equal swimming speed, the male competitive swimmers demonstrated a higher gross efficiency. However, this was due to the higher power output required by the male swimmers at a given speed. Gross efficiency was dependent on the absolute power output such that as power output increased so did the calculated gross efficiency. At the same power output, the values for the gross efficiency do not differ between the male and female competitive swimmers.

Biomechanical Phenomena↗
PubMedDate not supplied

The involvement of beta-endorphin in swim-induced antinociception in female mice.

A 30 sec swim in water at 30 degrees C reduced the writhing response produced in the female mice by i.p. acetic acid. Peripherally administered, naloxone and beta-endorphin1-27 antagonized this swim-induced antinociception. However, i.c.v. administration of these compounds had minimal effects on this phenomenon. beta-Endorphin1-27 was effective in antagonizing the antinociceptive effect of beta-endorphin, but not that of morphine. Furthermore, the doses of naloxone required to antagonize the swim-induced antinociception were similar to those required to antagonize beta-endorphin which produced the same degree of antinociceptive response, but were much higher than those required to block the effect of morphine. These results suggest the involvement of beta-endorphin in swim-induced antinociception in female mice and its interaction with some peripheral opioid receptor(s) other than the mu-receptor.

Animals↗
PubMed1989

The relationship of swimming exercise to bone mass in men and women.

Exercise appears to be capable of exerting a positive effect on bone mass, but how exercise can be used to best advantage in the prevention and therapy of osteopenia is unclear. Weight-bearing activity has been commonly considered to be essential for the beneficial effects of exercise on the skeleton, and, therefore, swimming has been considered valueless in the maintenance of bone mass. To examine this issue we measured radial and vertebral bone mineral density in a group of subjects aged 40 to 85 years who had been swimming regularly for at least 3 years as well as in a similar group of nonexercising control subjects. The swimmers engaged in no other forms of regular exercise, and no subject had other conditions known to affect bone or mineral metabolism. Dietary calcium and protein intakes were similar in the two groups. At both radial (0.84 +/- 0.08 vs 0.81 +/- 0.09 g/cm2) and vertebral (123 +/- 27 vs 108 +/- 31 mg/cm3) sites the male swimmers had significantly greater bone mineral density than did the nonexercisers. In women, however, no relationship of swimming to bone mineral density could be identified. These results suggest that swimming exercise may be beneficial in the prevention or therapy of osteopenia and that its usefulness in this regard should be further investigated.

Adult↗
PubMed1988

Regionally specific neural adaptation of beta adrenergic and 5-hydroxytryptamine2 receptors after antidepressant administration in the forced swim test and after chronic antidepressant drug treatment.

In the present investigation, experiments were performed in order to determine whether antidepressants are capable of inducing regionally specific adaptation of beta adrenergic and 5-hydroxytryptamine2 (5-HT2) receptors after chronic administration or when combined with the forced swim test. The drugs tested were imipramine, amitriptyline, pargyline and nomifensine. The regional pattern of beta adrenergic or 5-HT2 receptor binding changes induced after chronic treatment with these antidepressants was not uniform. All of the drugs reduced [3H]dihydroalprenolol binding to cortical membranes after chronic treatment but only two, imipramine and pargyline, did so in hippocampus. All of the antidepressants reduced cortical, but not hippocampal, beta adrenergic receptor binding after 2 days of treatment, indicating that the rate of antidepressant-induced neural adaptation is regionally specific. All of the drugs, except nomifensine, induced down regulation of both cortical and hippocampal 5-HT2 receptors after chronic treatment, as measured by [3H]ketanserin binding. The forced swim test accelerated the reduction of [3H] dihydroalprenolol binding in hippocampus induced by imipramine and pargyline while producing no further effect on cortical beta adrenergic receptors. The down-regulation of hippocampal, but not cortical 5-HT2 receptors by imipramine and pargyline was also facilitated in rats processed in the forced swim test. These results provide further support for the view that the forced swim antidepressant drug screen may be of heuristic value as a model of the adaptive neural mechanisms that accompany chronic antidepressant drug treatment. Furthermore, these data provide evidence that multiple neural mechanisms may be involved in the adaptive changes after antidepressant drug treatment.

Amitriptyline↗
PubMed1986

Effects of antidepressant drugs injected into the amygdala on behavioral responses of rats in the forced swim test.

Experiments were conducted to determine if the actions of antidepressant drugs in a pharmacological screen would be localized to specific brain regions. Rats were infused in discrete brain regions with drugs of different pharmacological properties and processed in the forced swim test. Infusion of imipramine and pargyline into the amygdala produced behavioral responses similar to i.p. injections of the drugs. The regions of the amygdala from which positive responses could be elicited were highly selective. From cannula placements and diffusion studies with autoradiography it appears that a locus of action of imipramine and pargyline is confined to the central, basolateral and/or lateral nuclear regions of the amygdala. Behavioral responses of rats in which imipramine was infused into the anterior amygdala or caudate-putamen did not differ from saline controls. When infused into regions of the amygdala in which imipramine was active, iprindole, an "atypical" antidepressant, did not produce a behavioral response in the forced swim test. Two "false positives" in the forced swim test, atropine and amphetamine, were also not active when infused into the amygdala. These results indicate that the amygdala is a critical site of action for certain antidepressant drugs in the forced swim test, and that behavioral activation in the test induced by iprindole, amphetamine and atropine involve brain regions other than the amygdala.

Amygdala↗
PubMed1988

Chlorine poisoning at the swimming pool revisited: anatomy of two minidisasters.

A case of acute chlorine gas exposure in a swimming pool attendant was previously reported (Clin Tox 13:377-381, 1978). In April 1986, approximately 30 people, including a swimming coach, lifeguards, and competitive swimmers ranging in age from 5 to 12 years old, were exposed to heavy concentrations of chlorine gas at a large indoor swimming pool. The coach, one lifeguard, and 18 of the children were hospitalized. In June 1988, a similar exposure occurred at the same swimming pool, and 11 persons were affected. Information from these 2 incidents illustrates 4 important factors in disaster prevention and management: proper training of equipment operators, effectiveness of triage, information flow to relatives of the afflicted, and requisite posthospitalization followup to detect possible long-term adverse effects.

Child↗
PubMed1988

Relationships between swimming speed, oxygen consumption, plasma catecholamines and heart performance in rainbow trout (S. gairdneri R.).

Rainbow trout swimming at controlled speeds in a tunnel respirometer have been used to measure oxygen consumption and plasma catecholamine levels, and systolic pressure/frequency relationships. Catecholamine (CA) levels evaluated in trout plasma at low swimming speed [0.5 bodylengths/second (bl/s)] were: adrenaline (A) 1.77 +/- 0.22 nM; noradrenaline (NA) 3.94 +/- 0.83 nM; dopamine (DA) 2.40 +/- 0.36 nM. No significant increase was observed during moderate exercise (1.5 bl/s): A 1.60 +/- 0.20 nM; NA 5.76 +/- 1.07 nM; DA 2.31 +/- 0.80 nM, or stronger exercise (2.0 and 2.5 bl/s-1): A 2.10 +/- 0.21 nM; NA 5.90 +/- 0.90 nM; DA 2.21 +/- 0.40 nM. A correlation was found between heart rate at these swimming speeds, and its position on the systolic pressure frequency curve of isolated hearts, which suggests that the heart functions at maximum systolic pressure at low (0.5 bl/s-1) swimming speeds and that this pressure decreases during exercise as cardiac frequency rises.

Animals↗
PubMed1986

Swimming with grommets.

A controlled prospective study was designed to find the relation of otorrhoea with swimming in ears with grommets. The children were allowed to swim in swimming pools without any precautions. They were advised not to swim during an upper respiratory infection. The results show that the incidence of otorrhoea among swimmers and non-swimmers after first 6 weeks post-operatively was remarkably similar.

Child↗
PubMed1979

Swimming accuracy and consistency of scuba divers under conditions of low visibility.

We had 55 blindfolded scuba divers repeatedly attempt to swim a straight line, make 90 degrees turns to the right and left, and make a 180 degrees turn. A given diver was reasonably consistent in the direction of his error from one trial to another and from one maneuver to another, although about half the divers tended to err to the right and half to the left. When attempted in a swimming pool, the median error over all maneuvers, irrespective of direction, was about 12 degrees. Further experiments showed that the direction of error was consistent, whether the divers were wearing scuba tanks or not, and whether they were swimming blindfolded in a swimming pool or sighted in a lake with water visibility limited to about 2 m. Direction of error did not correlate, however, with the preferred hand, with preferred foot for kicking a football, or with relative strength of the legs. Although hand- and foot-preference were highly correlated, foot-preference was not correlated with relative strength of legs.

Diving↗
PubMed1979

[Nutritional, cardiac and adrenergic changes induced by swimming training in rats (author's transl)].

The effects of training were investigated in male Sprague Dawley rats group (N), fed ad libitum, by measuring the weight increase and food intake of the animals, biochemical parameters (myocardial triglycerides and glycogen levels), mechanical and metabolic properties of the heart, and adrenergic reactions to swimming stress. An other group of rats remaining sedentary served as control (T). Conditioned rats had been submitted to a one hour test swim 6 days a week for 9 weeks. Gradually additional weights were fixed to the thorax. At the end of training, the load reached 6% of the body weight. Both groups were sacrified by decapitation at the same time, thirty hours after the last swimming session. The study of mechanical performances and metabolic properties was achieved with isolated working heart preparation. Adrenergic reactions of swimming stress were evaluated from plasma, heart and adrenal catecholamine concentrations.

Animals↗
PubMed1977

Effect of single exhaustive swimming on mitochondrial enzyme activities in rat myocardium.

The present work is a continuation of our studies on mitochondrial functions and enzyme activities after acute exhaustive swimming in liver and myocardium. In rat heart mitochondria the activities of SDH, cytochrome oxidase and ATPase (DNP-stimulated) increase after swimming and remain at that level until the end of the 22-hour rest period studied. The enzyme complexes--rotenone-sensitive NAD. H-cytochrome c-reductase and succinate-cytochrome c-reductase--decrease their activities in both experimental groups. The reduced activity of these two enzymes is determined by changes in this part of the respiratory chain which occur after the incorporation of DCPIP in the oxidation-reduction processes. The marker enzyme of the outer mitochondrial membranes--rotenone-insensitive NAD.H-cytochrome c-reductase--reveals unchanged activity after swimming and a 22-hour period of rest. The different changes in the activities of enzymes with different localization and organization in heart mitochondria are explained by disorganization of the inner membranes after exhaustive swimming, which could induce both activation of some enzymes and inhibition of others. The effect of certain factors during muscle exercise which could cause the established structural and functional changes in the mitochondria is discussed.

Animals↗
PubMed1983

Renal haemodynamics and the effect of alpha-adrenergic blockade in running and swimming splenectomized dogs.

In splenectomized dogs swimming causes a stronger vasoconstriction in the kidney than treadmill running. Renal blood flow measured by electromagnetic flow probes decreased by 10% during treadmill running and by 37% during swimming. The renal perfusion remained low during 30 min after both running and swimming. Arterial pressure increased during running and during swimming. Phenoxybenzamine, an alpha-adrenergic blocking agent, practically abolished the changes in renal perfusion induced by exercise, but not those in arterial pressure. The changes in renal blood flow and arterial pressure were stronger than those found in a previous study in non-splenectomized dogs. We conclude that in splenectomized dogs sympathetic and adrenomedullary response during exercise is increased resulting in a stronger renal vasoconstriction and a more pronounced increase in arterial pressure, than in intact dogs.

Adrenergic alpha-Antagonists↗
PubMed1983

[Swim therapy in elderly patients with essential hypertension treated with beta receptor blockers].

It is reported on the behaviour of blood pressure and heart rate at rest as well as on the peripheral microcirculation of the working musculature after physical conditioning in older patients with essential arterial hypertension (stage I and II). The patients with hypertension conditioned in 4 groups (twice a week swimming or once a week swimming and run each with and without propranolol) showed systolic and diastolic decrease of blood pressure with the exception of some patients. The heart rate at rest was significantly reduced only in the groups with swimming twice a week with and without beta-blockers. By means of the xenon-133-half-life period with the exception of the run-swimming group in all groups could be proved significant improvements of the peripheral microcirculation after the therapy, in contrast to the time before therapy. Value and limits of the training treatment described for the influence on the factor of risk arterial hypertension at old age are discussed.

Aged↗
PubMed1981

[Important hygienic aspects for swimming pools (author's transl)].

The major epidemics which occurred in Hungary and originated from water in swimming pools are reported. The difficulties encountered in producing epidemiological evidence and in monitoring infections originating from water in swimming pools are mentioned. The possibilities of controlling the water quality in swimming pools and of preventing infections are discussed. Reference is made to the existing bacteriological limit values in Hungary to be observed in the recirculation of water in swimming pools.

Bacteria↗
PubMed1982

[Central dopaminergic function in stroke-prone spontaneously hypertensive rats (SHRSP): I. Alteration of locomotor activity and swimming ability].

The possible alteration of central dopaminergic (DA) function, which accompanies the development and persistence of hypertension, was studied in SHRSP by measuring the lisuride-induced locomotor activity and the swimming ability. 1) When administered at a dosage of 50 micrograms/kg, lisuride, a DA agonist, induced significant increases of the locomotor activity in one- and 2-month-old Wistar Kyoto rats (WKY), but not in the 6 month-old rat. Differing from the response of WKY, SHRSP showed only a moderate increase in the locomotor activity at the age of one month (means of systolic blood pressure: 128 mmHg) and apparently no increase at the age of 2 months (176 mmHg). In 6 month-old SHRSP (238 mmHg), hypomotility but not hypermotility was induced by the lisuride administration. 2) Though no significant difference was detected at the age of 4 months, the swimming ability of SHRSP at the age of 8 months was deteriorated significantly as compared to that of WKY, and the impaired swimming performance of SHRSP was improved by the administration of lisuride. These results indicate that some alterations in the synaptic sites of the central DA neuron occurred already at an early stage of the hypertensive development, followed under persistent hypertension by the progressive deterioration of the motor-coordination ability as detected in the swimming ability.

Age Factors↗
PubMed1980

The economics of age-group swimming in Ontario.

This study investigated the socio-economic status of the parents of Ontario swimmers and parental expenditures, in terms of time and money, in support of competitive swimming. Questionnaires were mailed to a sample of 400 families of Ontario competitive swimmers. Spearman rho analyses were used to determine the relationships of membership fee, total cost and total time spent by the parents to the ability and age of the swimmer and the number of hours of practice and swim meets. Parents of Ontario competitive swimmers are upper middle class and devote a great deal of their time (X = 433 hours) and money (X = $744.00) annually to competitive swimming. Total expenditures and time spend by the parents were greater for those children were young and also for those whose children demonstrated greater ability (i.e., closer to Ontario record). Spearman rho analyses suggested that membership fees are not determined on the basis of age, number of practice hours or number of swim meets.

Adolescent↗
PubMed1995

Rats with fimbria-fornix lesions display a place response in a swimming pool: a dissociation between getting there and knowing where.

Some theories of hippocampal formation function postulate that it is involved in using the relationships between distal cues for spatial navigation. That rats with damage to the hippocampal formation are impaired in learning place responses of escaping to a platform hidden just below the surface of the water of a swimming pool, supports this view. Using rats with fimbria-fornix (FF) lesions, we examined whether their impairment is related to an inability to learn how to reach the platform as opposed to learning its location. In a first experiment, the FF rats were impaired in learning to swim to a hidden platform but could swim to a visible platform. In a second experiment, after being pretrained to swim to a visible platform, the FF rats swam to, paused, and searched the vicinity of the platform's previous location when it was removed. This finding showed that the FF rats expected to find the platform at that location. Additional tests confirmed that they had learned a place response. Despite having acquired a place response, they still could not acquire new place responses when only the hidden platform training procedure was used. Thus, these results in dissociating the processes of "getting there" and "knowing where" suggest that the FF rats' impairment may be in some process of motoric control, such as path integration, rather than in learning the location of the platform in relation to ambient cues. The results are discussed in relation to relevant theories of hippocampal function.

Animals↗
PubMed1993

High density lipoprotein cholesterol following anaerobic swimming in trained swimmers.

HDL-C, LDL-C, total cholesterol and glycerol were determined in venous blood of 10 male trained swimmers at rest and following 100-m anaerobic swimming. When compared to rest levels, the peak HDL-C and glycerol concentrations were significantly enhanced following anaerobic swim test (p < 0.01). However, peak LDL-C and total cholesterol after anaerobic swim were not significantly increased compared with the rest level. The present data demonstrated that the anaerobic swimming induces an increase in HDL-C metabolism, suggesting that the anaerobic exercise per se was one reason for the elevated HDL-C levels.

Adolescent↗