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Use of different methods for testing morphological characteristics and evaluation of body tissue composition of swimmers

100%
Pietraszewska J., Jakubowski W.
Central European Journal of Sport Sciences and Medicine
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2013
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tom 03
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nr 3
Specific characteristics of sport disciplines require their performers to meet certain demands, also those related to body build. A success is conditioned, among other things, by the morphological structure of competitors. For this cause, their somatic features should be taken into consideration in the selection process. The aim of this research was to describe the level of morphological development and body proportions of swimmers in comparison to their non-practicing peers. What is more, different methods were used to evaluate body tissue composition. The research was based on the measurements of 33 swimmers and 36 non-practicing sport males as a control group, with the average training period of 9 years. The subjects ranged from 18 to 23 years of age. The anthropometric features were examined. Two methods, anthropometric and bioelectrical impedance, were used to estimate the amount of body fat. Athletes performing swimming are characterized by the significant body height, long trunk, wide range of arms and highly developed shoulder girdle. Directed and systematic training has an influence on a great development of the upper part of the trunk and a slight decrease in body fat. The observed differences indicate that depth, circumference and mobility of the chest developed in swimming have a positive influence on the respiratory system. Poor differences observed in the amount of fat in the athletes and non-practicing subjects may result from the fact that the body accumulates fat tissue, used as a good thermal insulation.
2

Description of two new species of Philometra Costa, 1845 (Nematoda: Philometridae) from marine fishes off Japan, with notes on Philometroides seriolae (Yamaguti, 1935)

100%
Moravec F., Ogawa K.
Acta Parasitologica
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2019
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tom 64
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nr 4
3

Location and variability of catalase activity within aphids

80%
Urbanska A.
Electronic Journal of Polish Agricultural Universities. Series Biology
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2007
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tom 10
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nr 4
4
Content available remote

Melatonin and aging: prospects for human treatment

80%
Bubenik G. A., Konturek S. J.
Journal of Physiology and Pharmacology
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2011
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tom 62
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nr 1
Human life span, with or without modern medicine is around 85-95 years. All living creatures have their inner clock that measures their daily (circadian) and their seasonal (circannual) time. These time changes are mediated by the alteration of levels of melatonin, an evolutionary ancient hormone, which is produced in many body tissues, including the pineal gland, retina and the gastrointestinal tract (GIT). Light is blocking the production of melatonin in the pineal gland, darkness is stimulating it. So, the diurnal changes of light intensity of melatonin, provide a "daily clock" and the seasonal changes provide a "seasonal clock". Finally, the reduction of melatonin observed with aging, may indicate the presence of an "age clock". Melatonin is a strong antioxidant (often it is called scavenger of free radicals), which protects the body from the effects of noxious compounds. Therefore it was hypothesized that the reduction of melatonin levels with age contributes to the aging process. So far, the only remedy to extend the life span was a 40% reduction in caloric intake, which prolonged the life in mice, rats, dogs and monkeys by 30-50%. A large group of people imitate these experiments performed on animals, but the results of these experiments will not be known for several decades. How is being hungry prolonging the life span? There is a connection between caloric reduction and melatonin levels in GIT. Several experiments indicate that fasting in animals substantially increased their production of GIT melatonin. Therefore, instead of being permanently hungry, a prolongation of human life could be achieved by a replacement melatonin therapy. A daily intake of melatonin before bed time might achieve the same effect as fasting e.g. an increase of body melatonin levels, which will protect the individual from the ravages of old age. That includes Parkinson's disease and Alzheimer's disease. There is a large group of people taking melatonin daily who believe that melatonin is the "fountain of youth". Those are the subjects which will one day provide an experimental evidence of the efficacy of melatonin.
5

Early detection of extraneous substances in pig meat

80%
Kovac L., Mlynek J., Popelka P., Bobcek B., Vano M.
Annals of Animal Science. Supplement
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2002
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nr 2
6

Stress proteins induced by cadmium in the abdominal muscle of the shrimp Crangon crangon

80%
Napierska D., Radlowska M.
Oceanologia
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1998
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tom 40
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nr 2
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