Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 5

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

Search:
in the keywords:  ultra-endurance
help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Is the Prevalence of Exercise-Associated Hyponatremia Higher in Female than in Male 100-KM Ultra-Marathoners?

100%
Rüst C., Knechtle B., Joleska I., Knechtle P., Wirth A., Imoberdorf R., Senn O., Rosemann T.
Human Movement
|
2012
|
vol. 13
|
issue 2
94-101
EN
Purpose. The prevalence of exercise-associated hyponatremia (EAH) has mainly been investigated in male endurance athletes. The aim of the present study was to investigate the prevalence of EAH in female 100-km ultra-marathoners and to compare them to male ultra-runners since females are considered more at risk of EAH. Methods. Changes in body mass, hematocrit, [Na+] and [K+] levels in both plasma and urine, plasma volume, urine specific gravity, and the intake of energy, fluids and electrolytes was determined in 24 male and 19 female 100-km ultra-marathoners. Results. Three male (11%) and one female (5%) ultra-marathoners developed asymptomatic EAH. Body mass decreased, while plasma [Na+], plasma [K+] and hematocrit remained stable in either gender. Plasma volume, urine specific gravity and the potassium-to-sodium ratio in urine increased in either gender. In males, fluid intake was related to running speed (r = 0.50, p = 0.0081), but not to the change in body mass, in post-race plasma [Na+], in the change in hematocrit and in the change in plasma volume. Also in males, the change in hematocrit was related to both the change in plasma [Na+] (r = 0.45, p = 0.0187) and the change in the potassium-to-sodium ratio in urine (r = 0.39, p = 0.044). Sodium intake was neither related to post-race plasma [Na+] nor to the change in plasma volume. Conclusions. The prevalence of EAH was not higher in female compared to male 100-km ultra-marathoners. Plasma volume and plasma [Na+] were maintained and not related to fluid intake, most probably due to an activation of the reninangiotensin-aldosterone-system.
2
Content available remote

A Paradigm for Identifying Ability in Competition: The association Between Anthropometry, Training and Equipment with Race Times in Male Long-Distance Inline Skaters - the ‘Inline One Eleven’

100%
Knechtle B., Knechtle P., Rosemann T.
Human Movement
|
2011
|
vol. 12
|
issue 2
171-179
EN
Purpose. The association between anthropometric and training characteristics on an athlete's performance has been investigated in swimmers, cyclists and runners, but not in inline skaters. The aim of this study was to investigate the relationship between anthropometry, pre race preparation and equipment in the finishers of the longest inline race in Europe, the ‘Inline One eleven’ over 111 km in Switzerland. Basic procedures. We investigated the association of anthropometry, training, and equipment variables with race times in 84 male ultra-endurance inline skaters using bi- and multivariate analysis. Main findings. In the multivariate analysis, percent body fat, duration per training unit, and personal best time in the ‘Inline One eleven’ was related to the race time for all finishers. Out of the 84 finishers, 58 had already finished an ‘Inline One eleven’ while 26 participated for the first time. Speed in training and the kind of skates worn were related to race times of the 26 inexperienced finishers. The inexperienced finishers skating with custom made skates were significantly faster with 229.1 (12.7) min compared to inexperienced finishers using ordinary skates finishing within 290.8 (35.4) min (p < 0.001). For experienced inliners, body mass, the sum of skin-folds and percent body fat correlated to race time. Conclusions. We assume that inexperienced athletes in ultra-endurance skating need time to gain the experience necessary in choosing the correct equipment and doing the training in order to successfully finish a long-distance inline race. Experienced inliners can only improve race performance in an ultra-endurance inline race such as the ‘Inline One eleven’ through a reduction of their body fat.
3
Content available remote

Changes in the Blood Antioxidant Defense Capacity During a 24 Hour Run

100%
Zbigniew W., Ewa S.-K., Barbara K., Sławomir J., Małgorzata M., Katarzyna K., Stanisław P., Dagmara G.
Journal of Human Kinetics
|
2010
|
vol. 24
65-74
EN
The objective of this study was to determine whether running a 24-h race would cause oxidative damage and changes in the blood antioxidant defense capacity in endurance-trained athletes. Fourteen male amateur runners (mean age 43.0±10.8 y, body weight 64.3±7.2 kg height 171±5 cm, weekly covered distance 81±43 km, training history 8±9 y) who participated in a 24-hr ultra-marathon and volunteered to give blood samples during the race were enrolled for this study. Blood samples were taken before the run, after completing the marathon distance (42.217 km), after 12 h and at the conclusion of the race.The capacity of erythrocyte antioxidant defense system was evaluated by measuring the activities of superoxide dismutase (SOD), glutathione peroxidase (GPX), catalase (CAT), glutathione reductase (GR), concentrations of non-enzymatic antioxidants (uric acid and glutathione-GSH), and selected biomarkers of oxidative stress (i.e., plasma level of malondialdehyde (MDA) and plasma antioxidant capacity by FRAP ("ferric-reducing ability of plasma")). Moreover, in order to elucidate between-group differences in the total capacity of the blood antioxidant defense system, an index of antioxidant potential (POTAOX) was calculated as a sum of standardized values of activities of antioxidant enzymes (SOD, CAT, GPX, GR) and non-enzymatic antioxidants (uric acid, GSH).A progressive decline was observed in activities of SOD and CAT with the distance covered during the race, while the opposite trend was found in activities of GPX and GR that tended to increase. A significant decrease was recorded in GSH content after completing the marathon distance, which tended toward slightly higher values, without reaching the baseline level, at the finish of the race. Plasma concentration of uric acid (UA) was not significantly affected, except for the value recorded after 12 h of running that was significantly (p<0.05) lower, while both markers of oxidative stress (FRAP and MDA) increased significantly after completing the marathon distance. Comparison of the calculated values of the POTAOX index recorded pre-race and throughout the competition implies that the most drastic decline in the total antioxidant capacity occurred at mid-race (i.e. after 12 h of running).
4
Content available remote

What Influences Race Performance in Male Open-Water Ultra-Endurance Swimmers: Anthropometry or Training?

100%
Knechtle B., Baumann B., Knechtle P., Rosemann T.
Human Movement
|
2010
|
vol. 11
|
issue 1
5-10
EN
Purpose. We investigated the relationship between selected variables of anthropometry and training with race performance during a 26.4 km open-water ultra-endurance swim at 23°C in male master ultra-swimmers. Basic procedures. Fifteen non-professional male open-water ultra-endurance swimmers who were (mean ± SD) 40.0 (8.2) years of age with 83.7 (10.3) kg body mass, 1.80 (0.08) m body height and a BMI of 25.5 (2.5) kg/m2 finished the race within the time limit. Body mass, percent body fat, thickness of 7 skin folds, body height, length of arm, and length of leg were measured prior to race. The number of years as active swimmer, average weekly training volume in hours and kilometres and average speed in training were recorded. The variables were then correlated to total race time. Main findings. Study participants had mean finish times of 551 (100) min and an average speed of 3.0 (0.5) km/h. Speed in swimming during training was the only variable related to total race time (r = -0.66, p = 0.0037) whereas none of the other investigated variables showed an association. Conclusions. We conclude that anthropometry was not related to race performance in these male ultra-endurance swimmers whereas speed in training showed a moderate association with total race time.
5
Content available remote

No Association Between Skinfold Thicknesses and Race Performance in Male Ultra-Endurance Cyclists in a 600 km Ultra-Cycling Marathon

100%
Knechtle B., Knechtle P., Rosemann T.
Human Movement
|
2009
|
vol. 10
|
issue 2
91-95
EN
Purpose. In long-distance runners, an association between skinfold thicknesses and running performance has been demonstrated. Basic procedures. We investigated the relationship between skinfold thicknesses and race time in cyclists in an ultra-endurance cycling race. In 28 ultra-endurance cyclists at the ‘Swiss Cycling Marathon’ over 600 km, skinfold thickness at 8 sites was measured pre race. Single skinfold thicknesses, the sum of 8 skinfolds and percent body fat were correlated with total race time. Main findings. The cyclists finished within 1.596 (296) min riding at an average speed of 26.8 (5.7) km/h. There was no correlation between single skinfold thicknesses, the sum of 8 skinfold thicknesses and percent body fat with total race time. Conclusions. In male ultra-cyclists in a 600 km ultra-marathon, no correlation between skinfold thicknesses and race performance has been detected as demonstrated in long-distance runners.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.