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PubMed1994

Methods for measurement of energy expenditure and substrate concentrations in swimming rats.

A measuring system is described for the determination of oxygen consumption (Vo2) and carbon dioxide production (Vco2) in swimming rats. Vo2 and Vco2 were measured by means of an O2-analyzer (Ametek S3A) and a mass spectrometer (Balzers QMG 511), respectively, combined with a gas flow meter. The measurements were made in a 5-1 metabolic chamber on top of a swimming pool in which a water flow of 0.22 m/s was maintained. The rats were fitted with an indwelling catheter with its tip at the entrance of the right atrium for the repeated determination of energy substrate and hormone concentrations, before, during, and after swimming. The inaccuracy of the Vo2 and Vco2 measurements was 0.18% and 0.31% of the reading, respectively; the imprecision was 2.15% and 2.59%. This high accuracy and precision of the system was attained by measuring room air for 20 s after each 100 s of measuring air from the metabolic chamber, and by using demineralized water in the swimming pool. Vo2 during steady-state swimming was 1.89 +/- 0.06 mmol/kg.min (ca. 60% Vo2max), indicating moderate exercise. Respiratory quotient (RQ), during steady-state exercise, was 0.80 +/- 0.01. Vo2 and RQ resulted in rates for carbohydrate and fat utilization of 15.6 +/- 0.8 and 15.1 +/- 0.7 mg/kg.min, respectively.

Animals↗
PubMed1999

[What does the non-dentistry-trained person know about avulsion?].

The prognosis of an avulsed permanent incisor depends on a swift and correct emergency treatment. The chance of a favourable prognosis increases if the tooth is replanted as quickly as possible, preferably by the persons first present at the scene of the accident. Usually this person is a layman, therefore the aim of this study is to investigate the knowledge in this respect. To 48 schools and 15 swimming pools in Amsterdam, Arnhem and Nijmegen (the Netherlands), questionnaires were sent. Thirty-six schools and 15 swimming pools responded. Twenty-eight percent of the respondents had previous experience with an avulsion. Ten percent of the respondents would replant the incisor and 90% would store the incisor. Sixty-three percent would treat the tooth correctly. Respondents with previous experience had no more knowledge of the most effective treatment than persons without previous experience. Swimming instructors and physical health instructors knew significantly more about avulsion than teachers in primary schools. Since only 10% of the respondents would replant the incisor and 37% would handle this accident incorrectly, more information seems to be necessary.

Caregivers↗
PubMed2004

Occurrence and production of chloramines in the chlorination of creatinine in aqueous solution.

Occurrence and production of stable chloramines in the chlorination of creatinine, a constituent of perspiration and urine, in aqueous media were studied. Creatinine (5 x 10(-5)M) was treated with free chlorine in aqueous solutions at molar ratios of 0.5-8 (chlorine/creatinine) at pH 7.0 at room temperature for several days. At lower ratios of chlorine, two stable N-chlorocreatinine derivatives, which were determined as dichloramine fractions by the DPD method, were isolated by HPLC and identified by EI-MS and (1)H-NMR. One was 2-chloroamino-1-methylimidazolin-4-one (creatinine chloramine) and the other was 2-chloroamino-5-hydroxy-1-methylimidazolin-4-one (hydroxycreatinine chloramine). In addition, the formation of methylamine was identified by GC-MS analyses of its imine derivative formed with pentafluorobenzaldehyde. Methylamine forms stable chloramines, which might be determined as mono- and/or di-chloramine fractions together with free chlorine by the DPD method in the reaction mixtures at higher molar ratios of chlorine. In practice, small amounts of methylamine (ca. 19 microg/L) were detected in water samples collected from several swimming pools. Hence, methylamine may be an origin of elusive organic chloramine formed in the chlorination of swimming pools. A probable mechanism of the occurrence and processing of chlorination products of creatinine is suggested.

Benzaldehydes↗
PubMed1992

A simple method for determining critical speed as swimming fatigue threshold in competitive swimming.

The purpose of this investigation was to determine whether the concept of the critical power could be applied to competitive swimming by using critical swimming speed (CS) as determined both in the swimming flume (CS-flume) and in the normal swimming pool (CS-pool) and whether CS could be utilized as a practical index for assessing a swimmer's endurance performance. CS defined as the swimming speed which could be theoretically maintained continuously without exhaustion was expressed as the slope of a regression line between swimming distance (D) and its duration (T) obtained at various swimming speeds. Eight highly trained swimmers were instructed to swim until onset of fatigue at four predetermined swimming speed levels in the swimming flume and at maximal effort over four different swimming distances in the swimming pool. In the results of CS-flume and CS-pool, the regression relations between D and T were expressed in the general form, D = a+b x T, with r2 being higher than 0.998 (p less than 0.01), respectively. These results both from the flume and the pool indicated extremely good linearity. Furthermore, maximal oxygen uptake (VO2max) during the incremental exercise test, swimming speed corresponding 4 mM of blood lactate concentration (V-OBLA) and mean velocity in the 400 m freestyle (V-400) were measured on each subject.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1982

Hospital hydrotherapy pools treated with ultra violet light: bad bacteriological quality and presence of thermophilic Naegleria.

The microbiological quality of eight halogenated and two u.v.-treated hydrotherapy pools in hospitals was investigated. The microbiological quality of halogenated hydrotherapy pools was comparable to halogenated public swimming pools, although in some Pseudomonas aeruginosa and faecal pollution indicators were more frequent due to bad management. On the other hand u.v.-treated hydrotherapy pools had very bad microbiological quality. Apart from faecal pollution indicators, P. aeruginosa was present in very high numbers. Halogenated hydrotherapy pools were not highly contaminated with amoebae, and Naegleria spp. were never detected. On the other hand u.v.-treated pools contained very high numbers of thermophilic Naegleria. The Naegleria isolated were identified as N. lovaniensis, a species commonly found in association with N. fowleri. Isoenzyme analysis showed a different type of N. lovaniensis was present in each of two u.v.-treated pools.

Amoeba↗
PubMed1998

Outbreaks of waterborne infectious intestinal disease in England and Wales, 1992-5.

Following the introduction of an improved surveillance system for infectious intestinal disease outbreaks in England and Wales, the Public Health Laboratory Service Communicable Disease Surveillance Centre received reports of 26 outbreaks between 1 January 1992 and 31 December 1995 in which there was evidence for waterborne transmission of infection. In these 26 outbreaks, 1756 laboratory confirmed cases were identified of whom 69 (4%) were admitted to hospital. In 19 outbreaks, illness was associated with the consumption of drinking water from public supplies (10 outbreaks) or private supplies (9 outbreaks). The largest outbreak consisted of 575 cases. In 4 of the remaining 7 outbreaks, illness was associated with exposure to swimming pool water. Cryptosporidium was identified as the probable causative organism in all 14 outbreaks associated with public water supplies and swimming pools. Campylobacter was responsible for most outbreaks associated with private water supplies. This review confirms a continuing risk of cryptosporidiosis from chlorinated water supplies in England and Wales, and reinforces governmental advice to water utilities that water treatment processes should be rigorously applied to ensure effective particle removal. High standards of surveillance are important for prompt recognition of outbreaks and institution of control measures. As microbiological evidence of water contamination may be absent or insufficient to implicate a particular water supply, a high standard of epidemiological investigation is recommended in all outbreaks of suspected waterborne disease.

Communicable Diseases↗
PubMed1994

Spatial behavior in the Brazilian short-tailed opossum (Monodelphis domestica): comparison with the Norway rat (Rattus norvegicus) in the Morris water maze and radial arm maze.

The spatial behavior displayed in a swimming pool and radial arm maze by the Brazilian gray, short-tailed opossum (Monodelphis domestica) was compared with that of the laboratory rat (Rattus norvegicus). The performance of the opossums was clearly different from that of the rats in both tasks. The opossums failed to learn to find a hidden platform in the swimming pool (place task), but they did learn to swim to a visible platform. The opossums did learn working and reference memory components of the radial arm maze but showed different search strategies in this situation. The results are discussed with reference to possible species differences in motor behavior, ecology, brain structure and evolution.

Animals↗
PubMed1982

Influence of stabilizer concentration on effectiveness of chlorine as an algicide.

Cyanuric acid, used as chlorine stabilizer in swimming pool waters, has a relatively minor effect on the algicidal efficiency of free chlorine. The toxicity of free chlorine to three swimming pool algae was reduced slightly by 25 mg of cyanuric acid per liter if inhibiting, but less than algicidal, concentrations of chlorine were employed. Higher stabilizer concentrations (50, 100, and 200 mg/liter) generally resulted in no further reduction in the algicidal efficiency of free chlorine beyond that observed at 25 mg/liter.

Journal Article↗
PubMedDate not supplied

Chlorine disinfection of recreational water for Cryptosporidium parvum.

We examined the effects of chlorine on oocyst viability, under the conditions of controlled pH and elevated calcium concentrations required for most community swimming pools. We found that fecal material may alter the Ct values (chlorine concentration in mg/L, multiplied by time in minutes) needed to disinfect swimming pools or other recreational water for Cryptosporidium parvum.

Animals↗
PubMed1986

[Efficacy of physical training and types of hemodynamics of essential hypertension patients and healthy subjects].

Physical stress tolerance and the effect of swimming-pool exercise were examined in patients with essential hypertension (EH) and normal untrained subjects with respect to their hemodynamic types. Threshold load capacity at bicycle ergometry and the amount of swimming-pool exercise were lower in EH patients and normal individuals with hypokinetic circulation, as compared to other hemodynamic types. Insufficient dilatation of the precapillary channel during exercise may be implicated here. In patients with stable EH and hypokinetic hemodynamics, exercise should be less intensive.

Adult↗
PubMed2007

Effect of submersion injury on water safety practice after the event in children, Saudi Arabia.

OBJECTIVE: To bring to light issues surrounding water safety practices and the impact of such incidents on these practices in our community. METHODS: We conducted a prospective observational study at King Abdul-Aziz Medical City, Riyadh, Kingdom of Saudi Arabia of all children <12 years of age presenting with submersion injury in the period between January 1999 through December 2004 noting the demographics and the pattern of water safety practices prior to and after event. RESULTS: A total of 29 patients were included. The majority of incidents took place in swimming pools. Water safety practices were lacking in most cases as evidenced by the fact that 87% of the victims were not properly supervised at the time of the event. None of swimming pools met the required safety regulations. Cardiopulmonary resuscitation knowledge was virtually nonexistent. The event did not have a positive impact on the water safety practices of the affected families. CONCLUSION: Submersion injury is also prevalent in land locked areas. Water safety practices are deficient in our community. Submersion injury was not enough to have a consistent positive impact on water safety practices of the affected families. Much can be carried out to improve water safety and save lives.

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↗
PubMed2001

Where children drown, United States, 1995.

CONTEXT: Drowning is the second leading cause of unintentional injury death among children ages 1 to 19 years. Details about the specific site of submersion are important for implementation of primary prevention efforts, but are not routinely available from national data. OBJECTIVES: To provide national data about the specific sites of drowning among US children and to examine site-specific drowning rates by age, race, and gender. SETTING: United States, 1995. DESIGN: Information was abstracted from death certificates for unintentional drownings among children <20 years of age. The site of drowning was coded from free text on death certificates. Proportional distributions of the site of drowning by age, region, gender, and race were examined. Site-specific drowning rates were calculated by age, race, and gender. Denominators were based on US Census Bureau, June 1995 estimates of the US population. RESULTS: For 1995, death certificates were obtained for 1420 unintentional drownings among children <20 years of age, 98% of the number of drowning deaths reported by the National Center for Health Statistics for the same year. Site of drowning was specified on 1308 (92%) death certificates. Fifty-five percent of infant drownings were in bathtubs. Among children between the ages of 1 to 4 years, 56% of drownings were in artificial pools and 26% were in other bodies of freshwater. Among older children, 63% of drownings were in natural bodies of freshwater. Site-specific drowning rates varied by race. Importantly, after the age of 5 years, the risk of drowning in a swimming pool was greater among black males compared with white males with rate ratios of 15.1 (95% confidence interval: 6.7-38.5) among 10- to 14-year-olds and 12.8 (95% confidence interval: 6.5-26.9) among 15- to 19-year-olds. CONCLUSION: The variety of sites in which children drown, even within specific age groups, emphasizes the need for a multifaceted approach to prevention. Reductions in the relatively high rates of drowning among black adolescent males will require targeted interventions to prevent swimming pool drownings among this group.

Adolescent↗
PubMed1990

[Near drowning of a child with severe epilepsy].

A case of near-drowning in an 11 year old child with severe epilepsy (myoclone-astatic) is described. The child was left alone in a indoor swimming-pool and was found lifeless on the bottom 1-2 minutes later presumably after an epileptic seizure. Resuscitation was instituted immediately and the child survived without sequelae. Leaving children with seizure phenomena without observation in the neighbourhood of swimming pools, is warned against.

Accidents, Home↗
PubMed2003

Time limit and VO2 slow component at intensities corresponding to VO2max in swimmers.

The purpose of this study was to measure, in swimming pool conditions and with high level swimmers, the time to exhaustion at the minimum velocity that elicits maximal oxygen consumption (TLim at vVO(2)max), and the corresponding VO(2) slow component (O(2)SC). The vVO(2)max was determined through an intermittent incremental test (n = 15). Forty-eight hours later, TLim was assessed using an all-out swim at vVO(2)max until exhaustion. VO(2) was measured through direct oximetry and the swimming velocity was controlled using a visual light-pacer. Blood lactate concentrations and heart rate values were also measured. Mean VO(2)max for the incremental test was 5.09 +/- 0.53 l/min and the corresponding vVO(2)max was 1.46 +/- 0.06 m/s. Mean TLim value was 260.20 +/- 60.73 s and it was inversely correlated with the velocity of anaerobic threshold (r = -0.54, p < 0.05). This fact, associated with the inverse relationship between TLim and vVO(2)max (r = -0.47, but only for p < 0.10), suggested that swimmers' lower level aerobic metabolic rate might be associated with a larger capacity to sustain that exercise intensity. O(2)SC reached 274.11 +/- 152.83 l/min and was correlated with TLim (r = 0.54), increased ventilation in TLim test (r = 0.52) and energy cost of the respiratory muscles (r = 0.51), for p < 0.05. These data suggest that O(2)SC was also observed in the swimming pool, in high level swimmers performing at vVO(2)max, and that higher TLim seems to correspond to higher expected O(2)SC amplitude. These findings seem to bring new data with application in middle distance swimming.

Adolescent↗
PubMed2006

Water incident related hospital activity across England between 1997/8 and 2003/4: a retrospective descriptive study.

BACKGROUND: No one has ever reported or investigated the number of people who have been admitted to hospital for a water related incident. The purpose of this paper is to examine, the hospital activity resulting from such incidents including to length of stay, gender, age and cause. METHODS: The data was extracted from the Hospital Episode Statistics (HES) for episodes with a mention of ICD 10 (V90-94, W15-16, W65-74, X38, X92, Y21) for the years 1997/8 to 2003/4. Population based rates and relative risk were calculated using the most recent Census data for England (2001). RESULTS: The 6,793 episodes resulted in a total of 32,520 bed days with an average of length of stay of 5.0 days. Males made up 73.7% (n = 5,006) of episodes and females 26.1% (n = 1,787). Annual trends peaked in 1999-2000 at a rate of 2.4 per 100,000 and have fluctuated on alternate years there after. In terms of relative risk males are at a 2.3 to 3.0 increased annual risk of being admitted compared to females, relating to a water event. The highest annual rates were observed within the 0 - 14 age group, ranging from 3.1 to 4.2 episodes per 100,000. CONCLUSION: Based on these findings, for every one drowning that occurs per year there are three hospital episodes. Each of the age groups identified within the study reported an increase in hospital episodes between 2002 - 2003 and 2003 - 2004, when considering the fatality information available it would appear that although fatalities are decreasing in the similar time period, hospital episodes are increasing. For the 0-14 age group, the cause of the injury had changed over the years, moving away from bath tub and swimming pool, to watercraft incidents (V91 - 93). For the 15 - 59 age group there had been a decline in the frequency of watercraft and water transport episodes, however, an increase in diving and jumping injury and incidents. In the over 60 age group water transport episodes remained the most frequent, with swimming pool related episodes declining and other specified drowning and submersion increasing. More work needs to be undertaken in regard to who is admitted to hospital, when where, and how to fill gaps in knowledge and highlight information that is critical to prevention strategies.

Adolescent↗
PubMed2005

An Italian study on Cryptosporidium and Giardia in wastewater, fresh water and treated water.

Cryptosporidium oocysts and Giardia cysts has been isolated from waters worldwide. In Italy, studies on these parasites in the environment are still limited due to absence of epidemiological evidence and difficulty of adequate methodologies of sampling and analysis. The new Drinking Water Directive 98/83/CE states that Cryptosporidium has to be determined in water intended for human consumption if Clostridium perfringens is detected. This investigation contributes to the knowledge of both Cryptosporidium and Giardia occurrences in Italian aquatic environments through a two-year monitoring program. In addition, indicator bacteria and Clostridium perfringens were monitored in sewage, surface waters, drinking water, and swimming pools and possible correlations were calculated among all the selected parameters. Cysts and oocysts were detected in sewage and surface water and Giardia numbers always prevailed over Cryptosporidium. The parasites were not detected in drinking water, while a positive sample was obtained from the analysis of swimming pools. Pearson's correlation coefficients evidenced a reciprocal correlation between both the protozoa and the Enterococci counts.

Animals↗
PubMedDate not supplied

[Sun exposure behavior of children between 3-15 years of age living in Montpellier].

OBJECTIVE: Increasing prevalence of skin cancer over the past few decades and their relationship with childhood sun exposure, show that educational campaigns on sun protection are urgently needed. The aim of this study is to estimate the degree of children's sun exposure in the south of France (43 degrees latitude north) and to study sun protection behaviors according to phenotypic characteristics. POPULATION AND METHODS: The population was a randomly selected sample of 573 schoolchildren between 3 and 15 years of age living in Montpellier. The questionnaire provided information about sociodemographic characteristics, summer sun exposure and sun protection. Phenotypic characteristics, reactivity to sunlight and number of sunburns since birth were also reported. RESULTS: Exposure time was very high: half of children spend over 6 hours per day outside in summer. The youngest children were the most protected either by sunscreen, or by shirt. On the beach, sunscreens were used more than half of the time of exposure by 70 p. 100 of the children. At the swimming pool, sunscreens were used by 45 p. 100 of the children and only by 14 p. 100 of them during other outdoor activities. A tee-shirt was only wore by 50 p. 100 of the children when playing on the beach, and by 75 p. 100 of them at the swimming pool. In addition, the application of sunscreen varied by body site. The adolescents, although they were exposed less than the youngest children, were very poorly protected. Light skinned children who do not tan easily had highest risk of sunburns, although they were generally more protected. CONCLUSION: The parents are able to identify highly sensitive children according to phenotype, but in practice the use of sunscreens and tee-shirt is very low. Parents and adolescents must be the target population but also insufficiently protected children. Health education at school must be an important measure for prevention.

Adolescent↗