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PubMed1986

Effects of aquatic training on swimming skill development of preschool children.

This research investigated the effects of aquatic training on the swimming performance of 126 children, ages 2.5 to 5.5 yr., over 8 mo. Two groups of children were enrolled in an aquatic training program. Group 1 were returning program participants at the beginning of this study, and Group 2 were new participants. The control children (Group 3) received no aquatic training during the research. Subjects performed six categories of swimming tasks at three points in time--1st mo., 4th mo., and 8th mo. The categories were Locomotion: Front, Locomotion: Back, Kicking, Entry: Jump, Diving, and Ring Pick-up. A 2 X 3 X 2 X 3 (sex X group X age X time) repeated-measures analysis of variance procedure showed that returning participants performed each category of swimming tasks at a more advanced level than the other groups at each time of measurement. New participants after training performed five of the categories of tasks at a more advanced level than the control group. Amount of training significantly influenced swimming, and training effects were task-specific when data were interpreted in terms of specific movement characteristics.

Achievement↗
PubMed1993

HDL-cholesterol: exercise formula. Results of long-term (6-year) strenuous swimming exercise in a middle-aged male with paraplegia.

Paraplegic individuals are at increased risk for developing heart disease because of low HDL-cholesterol levels. Exercise has been identified as an important factor in raising the HDL-cholesterol level. This case study documents the effects of long-term (6-year) strenuous exercise (2940 kcal/wk) on lipid markers in a 41-year-old white male with paraplegia. An additional 21 mg of HDL-cholesterol (84% increase) were observed in a paraplegic individual who swam 2100 kcal/week for 6 years. Througout this study, serial blood samples were analyzed for total cholesterol, HDL-cholesterol, LDL-cholesterol, and triglycerides. An initial low HDL-cholesterol of 25 mg/dl was measured in the subject. This case study continued for 72 months to determine the long-term effects on various blood lipid fractions of swimming an additional 2.5 hours/week. HDL-cholesterol slowly increased over the duration of the study. After 12 months of swimming the HDL fraction had increased from 25 mg/dl to 31 mg/dl. After 24 months and at the end of 72 months of swimming, the HDL fraction had risen to 43 mg/dl and 46 mg/dl, respectively. The estimated long-term energy cost for each additional 1 mg/dl of HDL-cholesterol above the pre-exercise HDL value was 100 kcal/week in this subject. Long-term strenuous swimming exercise has been successfully incorporated into the lifestyle of a paraplegic individual. Significant reduction in known coronary risk factors followed a marked increase in the HDL-cholesterol level.

Adult↗
PubMed1989

Swimming-induced suppression of rat pineal melatonin is prevented by pretreatment with calcium channel blockers.

Young adult male rats were treated with isoproterenol during the day to induce high levels of pineal N-acetyltransferase (NAT) activity and melatonin. Roughly 2 hr later when pineal NAT activity and melatonin levels were elevated, animals were given either an injection of a calcium channel blocker, i.e., either nifedipine or verapamil, or diluent. The rats were then forced to swim for 10 min in room temperature (22 degrees C) water. Fifteen minutes after swimming onset, pineal glands were collected for measurement of NAT activity and melatonin. Swimming caused a dramatic reduction in pineal melatonin content without influencing NAT activity. Nifedipine substantially and verapamil completely blocked the drop in pineal melatonin levels due to swimming without influencing NAT activity. The results suggest that calcium may be somehow directly or indirectly involved in melatonin release from the rat pineal gland.

Acetyltransferases↗
PubMed2000

A community outbreak of Cryptosporidium infection associated with a swimming pool complex.

A case-control study was conducted to investigate the cause of a sudden increase in cases of cryptosporidiosis notified to the Brisbane Southside Public Health Unit from January to March 1998. Fifty-two eligible cases were identified over a three-week period early in 1998. Thirty-one of these cases and 21 control subjects participated in the study. Swimming in the 2 weeks before onset of illness was identified as a likely risk factor for cryptosporidiosis infection (OR 3.1, CI 0.8-12.6, P = 0.06). Analysis of swimming pool attendance identified swimming at Pool Complex A as a significant risk factor for the acquisition of cryptosporidiosis (OR 8.9, CI 1.5-67.4, P = 0.004). No other potential risk factors were significantly associated with illness. The detection of cryptosporidium oocysts in three of the four pools at Pool Complex A supported the findings of the case-control study. As a response to this outbreak, Queensland Health has developed a Code of Practice outlining measures for the control and prevention of future outbreaks of swimming pool-associated cryptosporidiosis and/or giardiasis.

Adolescent↗
PubMed2005

Subclinical Listonella anguillarum infection does not impair recovery of swimming performance in rainbow trout Oncorhynchus mykiss.

This study examines whether injections of the commonly used bacterial-challenge pathogen Listonella anguillarum (formerly Vibrio anguillarum) negatively impact the ability of rainbow trout Oncorhynchus mykiss Walbaum to perform repeat swimming trials. Fish were given intraperitoneal injections of either a sub-lethal (10(5) colony forming units; CFUs) or a lethal (10(7) CFUs) dose of L. anguillarum, held for 48 h, and then given 2 successive ramp critical swimming speed (Ucrit) tests separated by 45 min. Compared with saline-injected control fish, the low-dose injection did not significantly impair swimming performance and recovery. Similarly, Ucrit and re-performance for fish surviving the high-dose injection were comparable to control (2 of 6 fish died after injection and before testing). In contrast, a positive control test of seawater challenge did impair recovery of swimming performance. In view of these results and common use of L. anguillarum as a challenge pathogen for toxicological studies, it seems unlikely that the consequences of pathogenesis impact the important cardiorespiratory changes associated with exercise.

Analysis of Variance↗
PubMed1977

Swimming pool immersion accidents: an analysis from the Brisbane drowning study.

An analysis of a consecutive series of 66 swimming pool immersion accidents is presented; 74% of these occurred in in-ground swimming pools. The estimated accident rate per pool is five times greater for in-ground pools compared with above-ground pools, where pools are inadequately fenced. Backyard swimming pools account for 74% of pool acidents. Motel and caravan park pools account for 9% of childhood immersion accidents, but the survival rate (17%) is very low. Fifty per cent of pool accidents occur in the family's own backyard pool, and 13.6% in a neighbour's pool; in the latter the survival rate is still low at only 33%. In only one of the 66 cases was there an adequate safety fence; in 76% of cases there was no fence or barrier whatsoever. Tables of swimming pool accidents by age, season, site and outcome are presented.

Accidents↗
PubMed1999

Swimming overuse injuries.

Swimming injuries are unique in that they involve upper limb overuse more than lower limbs and that swimming is performed in a non-weight-bearing fluid setting. Identifying the mechanism of injury and prescribing appropriate management is not easy unless one has a thorough understanding of proper technique of the four competitive strokes. Understanding the psychology of swimming athletes will improve outcome and compliance. The goals of this article are to familiarize the reader with the diagnosis and management of swimming injuries and to improve the physician's effectiveness in dealing with swimmers through a thorough understanding of technique and psychology.

Athletic Injuries↗
PubMedDate not supplied

Separate effects of a classical conditioning procedure on respiratory pumping, swimming, and inking in Aplysia fasciata.

We examined whether swimming and inking, two defensive responses in Aplysia fasciata, are facilitated by a classical conditioning procedure that has been shown to facilitate a third defensive response, respiratory pumping. Training consisted of pairing a head shock (UCS) with a modified seawater (85%, 120%, or pH 7.0 seawater--CSs). Animals were tested by re-exposing them to the same altered seawater 1 hr after the training. For all three altered seawaters, only respiratory pumping is specifically increased by conditioning. Swimming is sensitized by shock, and inking is unaffected by training, indicating that the conditioning procedure is likely to affect a neural site that differentially controls respiratory pumping. Additional observations also indicate that the three defensive responses are differentially regulated. First, different noxious stimuli preferentially elicit different defensive responses. Second, the three defensive responses are differentially affected by shock. Inking is elicited only immediately following shock, whereas swimming and respiratory pumping are facilitated for a period of time following the shock. Third, swimming and respiratory pumping are differentially affected by noxious stimuli that are delivered in open versus closed environments. These data confirm that neural pathways exist that allow Aplysia to modulate separately each of the three defensive behaviors that were examined.

Animals↗
PubMed1999

Chlorate as an inorganic disinfection by product in swimming pools.

Chlorate and chlorite concentrations were determined in water samples taken from 33 swimming pools. In the pools under investigation, disinfection of the water is carried out either by gaseous chlorine (n = 14) or hypochlorite solution in conjunction with flocculation and sand filtration. A number of the pools also use ozone treatment to augment the disinfection process. Chlorite was not detectable in any of the samples (detection limit 1 mg/l). High concentrations of chlorate were detected in samples from a number of the pools; in one case as high as 40 mg/l. Higher chlorate concentrations were found to be associated with those pools using hypochlorite solution as a disinfecting agent. In contrast, relatively low chlorate concentrations were found in pools treated with gaseous chlorine. In order to elucidate any relationship between the chlorate content of pool water and that of the respective hypochlorite stock solution, chlorate and bromate concentrations were determined in the hypochlorite stock solutions of nine pools. Bromate concentration in the stock solutions were not found to exceed 1.2 g/l, chlorate was measured in concentrations of up to 44.5 g/l. The additional use of ozone as part of the water purification process appears to have no significant influence on chlorate concentration. Chlorate has no bactericidal properties and does not interfere with the measurement of certain parameters relevant to hygiene in swimming pools such as free and combined chlorine, pH or redox potential. At present, the effects of high chlorate concentrations in swimming pool water are unclear. Our initial investigations indicate that chlorate has no cytotoxic (Neutral-Red assay) or irritating properties (HET-CAM assay). However, both chlorate and chlorite are known to interfere with the haematopoetic system. In Germany, the MCL for chlorite in drinking water is 0.2 mg/l. It is therefore strongly recommended that measures should be taken to reduce chlorate concentrations in swimming pool water.

Animals↗
PubMed2000

The effect of moderate swimming exercise on antioxidant enzymes and lipid peroxidation levels in children.

Strenuous exercise is characterized by increased oxygen consumption and the disturbance between intracellular pro-oxidant and antioxidant homeostasis. Although there are several studies related to an increase in antioxidant enzyme activity in adults doing exercise, the effect of regular exercise on antioxidant enzymes and lipid peroxidation levels has not been examined in children. In our study, the effects of a four week regular swimming exercise on antioxidant enzymes (superoxide dismutase and glutathione peroxidase) activities in erythrocytes and plasma thiobarbituric acid reactive substances (TBARS) levels, an indicator of lipid peroxidation, were investigated in previously untrained healthy children. We found that superoxide dismutase (SOD) activity was increased significantly following a four week swimming course (from 581.1 +/- 146.2 to 791.1 +/- 221.9 U/gHb, P < 0.01). Conversly, plasma TBARS levels were decreased from 1.1 +/- 0.4 to 0.9 +/- 0.3 nmol/ml (P < 0.05). Glutathione peroxidase (GPx) activity appeared to increase following swimming course, albeit not statistically significant (from 45.5 +/- 16.5 to 50.3 +/- 14.8 U/gHb). According to these findings, regular swimming exercise has beneficial effects on antioxidant defence in healthy children.

Child↗
PubMed1975

[Bacteriological and parasitological investigations in public indoor swimming baths (author's transl)].

The importance of the public swimming bath for the dissemination of Trichomonas vaginalis is disputed. 30 samples, each of 250 ml bath water from four indoor swimming baths, were examined for trichomonads. All the samples were negative. 218 smears taken from the wet places on the heated benches and other seating accommodation in these swimming baths were cultured for trichomonads and bacteria. Trichomonas vaginalis could not be demonstrated. Fecal organisms were found in 56 places, antibiotic-sensitive staphylococci were cultured from 20 samples and Ps. aeruginosa from 8. The negative tests for trichomonads suggests that the indoor swimming bath has no epidemiological importance in the dissemination of this parasite.

Animals↗
PubMed2000

Maximal oxygen uptake and cardiorespiratory response to maximal 400-m free swimming, running and cycling tests in competitive swimmers.

BACKGROUND: This study compared the cardiorespiratory response of trained swimmers to 400-m unimpeded front crawl swimming (SW), treadmill running (TR) and ergometer cycling (EC) maximal exercise tests, and evaluated the validity and specificity of a method to measure maximal aerobic power in swimming. METHODS: Two series of experiments were conducted. In series A (n=15), comparisons were made between VO2peak and other cardiorespiratory variables in three maximal tests: after 400-m SW, and during incremental TR and EC. In series B, VO2 peak and related variables were measured after SW and during EC (n=33). RESULTS: No significant differences were observed between VO2peak and VE in the three modes of exercise, although SW values tended to be higher. After SW, maximal ventilatory response was characterized by higher tidal volumes (VT) and lower respiratory rates (fR) as compared with TR and EC. The highest heart rate values (fH) were also observed in TR, followed by EC and SW. In series B, no significant differences were observed either in peak VO2 or VE, but fH was also lower in SW. CONCLUSIONS: A maximal 400-m unimpeded freestyle SW test yields essentially equal or nonsignificantly higher peak VO2 and VE values than during maximal TR or EC tests in trained swimmers. The specific maximal cardiorespiratory response to the SW test is characterized by higher VT, lower fR, and lower fH. Breath-by-breath measurements during the immediate recovery after a 400-m voluntary maximal swim is proposed as a valid and specific test for directly measuring maximal metabolic parameters and evaluating specific maximal aerobic power in swimming.

Bicycling↗
PubMed2001

Effect of swim taper on whole muscle and single muscle fiber contractile properties.

PURPOSE: To examine the changes in whole muscle function and single cell contractile properties of Type I and II muscle fibers from the deltoid muscle of highly trained swimmers before and after a 21-d reduction in training volume (taper). METHODS: Six college male swimmers (age, 20+/-1 yr; height, 187+/-2 cm, weight, 79+/-3 kg, fat, 7+/-1%) who had been, on average, swimming 6200 m x d(-1) for 5 months before the taper participated in this investigation. RESULTS: Whole muscle power increased (P < 0.05) 17% and 13% on the swim bench and swim power tests, respectively. Swim times improved by 4% (range: 3.0-4.7%; P < 0.05). There was no change in Type I fiber diameter, whereas Type IIa fibers were 11% larger (P < 0.05) after taper. Peak force (Po) of the Type I fibers was unaffected by the taper but increased (P < 0.05) from 0.63+/-0.02 to 0.82+/-0.05 mN in the IIa fibers. However, the specific force (Po/CSA) of the IIa fibers was unchanged. Shortening velocity (Vo) was 32% and 67% faster (P < 0.05) in the Type I and IIa fibers, respectively. Although Type I fiber power was unaltered, the IIa fibers increased 2.5-fold from 24.6+/-2.8 to 56.2+/-3.9 microN x FL x s(-1). When power was normalized for cell size, the power was still elevated twofold. CONCLUSIONS: These data suggest that tapering induces alterations in the contractile properties of single muscle fibers. Further, it appears that the Type IIa fibers are more affected than the Type I fibers by the taper. The increased size, strength, velocity, and power of the IIa fibers may be responsible for the improvements in whole muscle strength and power after the taper.

Adenosine Triphosphatases↗
PubMed2001

A comparative study of cardiovascular stress during different swimming strokes.

The study was aimed: (i) to compare maximum heart rate during exhaustive running (HRmasr) and swimming (HRmaxs), (ii) to compare heart rate (HR) in various modes of swimming-front crawl (FC), butterfly (BF), breast stroke (BRS) and back stroke (BS). HRmaxr (192.3 +/- 4.9 beats/min) of the swimmers (N = 7) was higher, although not significantly (P < 0.05), than their HRmaxs (183.7 +/- 3.8). Peak HR of the swimmers in FC, BF, BRS and BS (each of 100 m distance) were 179.9 +/- 7.2, 180.3 +/- 7, 178.6 +/- 6.2 and 177.3 +/- 5.4 beats/min respectively. Average HR in the respective events were 167.3 +/- 15.8, 166.6 +/- 14.1, 163.3 +/- 13.5 and 165.8 +/- 14.6 beats/min. Differences were not significant between any two modes, either in peak HR or mean HR. The results conclude that: (i) maximum HR in swimming is approximately 8 beats/min lower than maximal running and (ii) when the effort is maximum, cardiovascular stress remains unaltered in different swimming modes.

Adult↗
PubMed1994

Behavior of free-swimming cells under various accelerations.

The different steps of the gravity signal-transduction chain on the cellular level are not identified. In our experiments performed up to now we mainly stressed our attention on the last step, the response of the cells. Swimming behavior is a suitable indicator for the physiological status of a Paramecium cell. Depending on membrane potential and/or concentrations of Ca++, cGMP and cAMP the beating direction and the beating velocity of the cilia are influenced in a characteristical way leading to a changed swimming activity of the cell. The behavior of Paramecium is influenced by various stimuli from their environment. Previous studies have demonstrated that under controlled conditions Paramecium shows a clear gravity-dependent behavior resulting in negative gravitaxis and gravikinesis (speed regulation in dependence of gravity). By changing the orienting stimulus (gravity) we expected changes of the swimming behavior. Additional experiments were performed using pawn mutant d4-500r. Due to defective Ca(2+)-channels the membrane of this mutant cannot depolarize. As a consequence d4-500r cannot perform phobic responses and swim backwards. Comparative experiments are also performed with the ciliate Loxodes striatus. In contrast to Paramecium this ciliate possesses statocyst-like organelles--the Müller Organelles.

Animals↗
PubMed2001

The effect of a morning and afternoon practice schedule on morning and afternoon swim performance.

The purpose of the investigation was to examine the effect of a morning and afternoon practice schedule on morning and afternoon swim performance. Participants for this investigation included 6 men and 4 women competitive swimmers (mean age = 15.3 +/- 0.95 years). Training involved 4 months of a morning and afternoon practice schedule. Volume, relative intensity, and frequency during training were the same for all swimmers. Participants swam 4 times per week in the morning and 5 times per week in the afternoon. Outcomes were measured initially and after the 4-month morning and afternoon practice schedule in both the morning and afternoon. Prior to entering the water to swim a 91.44-m freestyle stroke, each swimmer's body temperature was taken from the ear. Immediately following the swim performance, participants were asked to rate their perceived exertion (RPE) based on Borg's CR-10 rating scale. The order of the test administration for the time of day was balanced. Testing was conducted at the same time of day as the training sessions. Each swimmer completed 1 test condition per day. Diurnal variation in body temperature was not affected by a morning and afternoon practice schedule (p = 0.0001). A diurnal trend appeared for RPE following a morning and an afternoon practice schedule, but the trend was opposite that reported for body temperature (p = 0.089). However, swim time differences witnessed between the initial morning and afternoon measurement (p = 0.017) decreased for participants involved in a morning and afternoon practice schedule (p = 0.069).

Adolescent↗
PubMedDate not supplied

The effects of swimming and running regimens on skeletal muscle glycogen in the rat.

Endurance capacity and the effects of different post-exercise states on skeletal muscle glycogen have been studied in rats trained by swimming or running and in sedentary controls. Regular endurance exercise resulted in increased skeletal muscle glycogen stores. A greater depletion was observed in trained animals than in non-trained animals after a training bout or exhaustive exercise. While muscle glycogen levels did not reflect a differential training stimulus (running vs swimming), swimming as a measure of exhaustive exercise was deemed invalid because of the ability of trained swimmers to avoid stenuous exercise by an alteration of swimming pattern.

Animals↗
PubMedDate not supplied

Effects of combined administration of 5-HT1A and/or 5-HT1B receptor antagonists and paroxetine or fluoxetine in the forced swimming test in rats.

Clinical data suggest that coadministration of pindolol, a 5-HT1A/5-HT1B/beta-adrenoceptor antagonist, and selective serotonin reuptake inhibitors (SSRIs) may shorten the time of onset of a clinical action and may increase beneficial effects of the therapy of drug-resistant depression. Effects of combined administration of SSRIs and 5-HT receptor ligands are currently evaluated in animal models for the detection of an antidepressant-like activity; however, the obtained results turned out to be inconsistent. The aim of the present study was to investigate effects of a 5-HT1A antagonist (WAY 100635), 5-HT1B antagonists (SB 216641 and GR 127935) or pindolol, given in combination with paroxetine or fluoxetine (SSRIs), in the forced swimming test in rats (Porsolt test). When given alone, paroxetine (10 and 20 mg/kg), fluoxetine (10 and 20 mg/kg), WAY 100635 (0.1 and 1 mg/kg), SB 216641 (2 mg/kg), GR 127935 (10 and 20 mg/kg) and pindolol (4 and 8 mg/kg) did not shorten the immobility time of rats in that test. Interestingly, SB 216641 administered alone at a dose of 4 mg/kg produced a significant reduction of the immobility time in that test. A combination of paroxetine (20 mg/kg) and WAY 100635 or pindolol failed to reveal a significant interaction; on the other hand, when paroxetine was given jointly with SB 216641 (2 mg/kg) or GR 127935 (10 and 20 mg/kg), that combination showed a significant antiimmobility action in the forced swimming test in rats. The active behaviors in that test did not reflect increased general activity because combined administration of both the 5-HT1B antagonists and paroxetine failed to alter the locomotor activity of rats, measured in the open field test. Coadministration of fluoxetine and all the antagonists used did not affect the behavior of rats in the forced swimming test. The obtained results seem to indicate that blockade of 5-HT1B receptors, but not 5-HT1A ones, can facilitate the antidepressant-like effect of paroxetine in the forced swimming test in rats. No interaction was observed between fluoxetine and 5-HT1A/5-HT1B receptor antagonists.

Animals↗