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  • English  (130)
  • 1
    UID:
    (DE-627)1580857280
    ISSN: 1664-042X
    Content: Background: High-intensity interval training (HIIT) is as a time-efficient alternative to moderate- or low-intensity continuous exercise for improving variables related to endurance and anaerobic performance in young and adolescent athletes. Objectives: To assess original research about enhancement of endurance and anaerobic exercise performance in young and adolescent athletes performing HIIT. Method: Relevant articles published in peer-reviewed journals were retrieved from the electronic databases PubMed and SPORTDiscus in December 2017. Inclusion criteria were: (i) controlled trials (HIIT vs. alternative training protocol) with pre-post design; (ii) healthy young athletes (≤ 18 years); (iii) assessing variables related to endurance and exercise performance. Hedges´ g effect size (ES), and associated 95% confidence intervals were calculated for comparison of any outcome between experimental (HIIT) and alternative training protocol. Results: Twenty four studies, involving 577 athletes (mean age: 15.5 ± 2.2 years), were included in this review. HIIT exerted no or small positive mean ES on peak oxygen uptake (VO2peak), running performance, repeated sprint ability, jumping performance and submaximal heart rate. Although the mean ES for changes in VO2peak with HIIT is small (mean g=0.10±0.28), the average increase in VO2peak from pre to post HIIT-interventions were 7.2 ± 6.9% vs. 4.3 ± 6.9% with any other alternative intervention. HIIT largely and positively affected running speed and oxygen consumption at various lactate- or ventilatory-based thresholds, as well as for sprint running performance. Calculations showed negative mean ES for change-of-direction ability (large), and peak blood lactate concentrations (small). Mean duration per training session for HIIT was shorter than for control interventions (28 ± 15 min. vs. 38 ± 24 min). Conclusion: The present findings suggest that young athletes performing HIIT may improve certain important variables related to aerobic, as well as anaerobic, performance. With HIIT, most variables related to endurance improved to a higher extent, compared to alternative training protocols. However, based on ES, HIIT did not show clear superiority to the alternative training protocols. Nevertheless, young athletes may benefit from HIIT as it requires less time per training session leaving more time for training sport specific skills.
    Note: Gesehen am 11.09.2018
    In: Frontiers in physiology, Lausanne : Frontiers Research Foundation, 2007, 9(2018) Artikel-Nummer 1012, 18 Seiten, 1664-042X
    In: volume:9
    In: year:2018
    Language: English
    URL: Volltext  (kostenfrei)
    URL: Volltext  (kostenfrei)
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  • 2
    UID:
    (DE-627)158372561X
    ISSN: 1664-042X
    Content: Objectives: The aim of this study was to examine the effect of time of day on short-term repetitive maximal performance and psychological variables in elite judo athletes. Methods: Fourteen Tunisian elite male judokas (age: 21±1 years, height:172±7 cm, body-mass: 70.0±8.1 kg) performed a repeated shuttle sprint and jump ability (RSSJA) test (6×2×12.5 m every 25-s incorporating one countermovement jump (CMJ) between sprints) in the morning (7:00 a.m.) and afternoon (5:00 p.m.). Psychological variables (Profile of mood states (POMS-f) and Hooper questionnaires) were assessed before and ratings of perceived exertion (RPE) immediately after the RSSJA. Results: Sprint times (p〉0.05) of the six repetition, fatigue index of sprints (p〉0.05) as well as mean (p〉0.05) jump height and fatigue index (p〉0.05) of CMJ did not differ between morning and afternoon. No differences were observed between the two times-of-day for anxiety, anger, confusion, depression, fatigue, interpersonal relationship, sleep and muscle soreness (p〉0.05). Jump height in CMJ 3 and 4 (p〈0.05) and RPE (p〈0.05) and vigor (p〈0.01) scores were higher in the afternoon compared to the morning. Stress was higher in the morning compared to the afternoon (p〈0.01). Conclusion: In contrast to previous research, repeated sprint running performance and mood states of the tested elite athletes showed no-strong dependency of time-of-day of testing. A possible explanation can be the habituation of the judo athletes to work out early in the morning.
    Note: Gesehen am 14.11.2018
    In: Frontiers in physiology, Lausanne : Frontiers Research Foundation, 2007, 9(2018) Artikel-Nummer 1499, 7 Seiten, 1664-042X
    In: volume:9
    In: year:2018
    Language: English
    URL: Volltext  (kostenfrei)
    URL: Volltext  (kostenfrei)
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  • 3
    UID:
    (DE-627)1736616684
    Format: 20
    ISSN: 2072-6643
    Content: To evaluate the effects of Ramadan observance on dietary intake, body mass and body composition of adolescent athletes (design: systematic review and meta-analysis; data sources: PubMed and Web of Science; eligibility criteria for selecting studies: single-group, pre-post, with or without control-group studies, conducted in athletes aged 〈19 years, training at least 3 times/week, and published in any language before 12 February 2020). Studies assessing body mass and/or body composition and/or dietary intake were deemed eligible. The methodological quality was assessed using ‘QualSyst’. Of the twelve selected articles evaluating body mass and/or body composition, one was of strong quality and eleven were rated as moderate. Ten articles evaluated dietary intake; four were rated as strong and the remaining moderate in quality. Continuation of training during Ramadan did not change body mass from before to the first week (trivial effect size (ES) = −0.011, p = 0.899) or from before to the fourth week of Ramadan (trivial ES = 0.069, p = 0.277). Additionally, Ramadan observance did not change body fat content from before to the first week (trivial ES = −0.005, p = 0.947) and from before to the fourth week of Ramadan (trivial ES = -0.057, p = 0.947). Lean body mass remained unchanged from before to the fourth week of Ramadan (trivial ES = −0.025, p = 0.876). Dietary data showed the intake of energy (small ES = -0.272, p = 0.182), fat (trivial ES = 0.044, p = 0.842), protein (trivial ES = 0.069, p = 0.720), carbohydrate (trivial ES = 0.075, p = 0.606) and water (trivial ES = −0.115, p = 0.624) remained essentially unchanged during as compared to before Ramadan. Continued training of adolescent athletes at least three times/week during Ramadan observance has no effect on body mass, body composition or dietary intake.
    Note: Gesehen am 26.10.2020
    In: Nutrients, Basel : MDPI, 2009, 12(2020,6) Artikel-Nummer 1574, 20 Seiten, 2072-6643
    In: volume:12
    In: year:2020
    In: number:6
    In: extent:20
    Language: English
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  • 4
    UID:
    (DE-627)1681672790
    Format: 12
    ISSN: 1573-3424
    Content: Laboratory studies confirm physical activity and physical fitness to be protective factors against mental stressors. However, there is still little evidence on the transferability of these findings into real-life stress situations. The main aim of this study was to examine the impact of physical activity and physical fitness on real-life psychophysiological stress responses to a mental stressor. The final exam of a training course for firefighter incident commanders represented the real-life mental stressor of our study. Cortisol level, heart rate, and heart rate variability were measured in 48 male firefighters at rest and during the exam. Cognitive stress appraisal was assessed as a psychological stress indicator. Physical activity was estimated using the International Physical Activity Questionnaire. Maximal oxygen uptake was measured as a parameter for physical fitness. The participants were divided according to their level of physical activity and physical fitness into groups of lower and higher physical activity/fitness level. All subjects showed significant physiological stress responses and a moderate cognitive stress appraisal during the exam. Subjects with different physical activity and physical fitness levels did not differ significantly in their physiological stress responses. Cognitive stress appraisal seemed not to be influenced by physical fitness but by physical activity, as more active subjects experienced significantly higher stress levels. Cognitive stress appraisal did not predict physiological stress responses. The assumed stress-buffering effect of physical activity and physical fitness could not be observed during the real-life mental stress of an exam consisting of commanding a group of firefighters in an emergency simulation. (PsycINFO Database Record (c) 2019 APA, all rights reserved)
    Note: First Posted: Oct 4, 2018 , Gesehen am 12.11.2019
    In: International journal of stress management, Washington, DC : APA, 1994, 26(2019), 4, Seite 344-355, 1573-3424
    In: volume:26
    In: year:2019
    In: number:4
    In: pages:344-355
    In: extent:12
    Language: English
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  • 5
    UID:
    (DE-627)813122465
    Format: graph. Darst.
    ISBN: 9781783470822
    In: Global clusters of innovation, Cheltenham [u.a.] : Elgar, 2014, (2014), Seite 41-92, 9781783470822
    In: 9781786434340
    In: year:2014
    In: pages:41-92
    Language: English
    Keywords: Aufsatz im Buch
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  • 6
    UID:
    (DE-603)424759489
    ISSN: 1867-8610
    Content: We present the characterization and application of a new gas chromatography time-of-flight mass spectrometry instrument (GC-TOFMS) for the quantitative analysis of halocarbons in air samples. The setup comprises three fundamental enhancements compared to our earlier work (Hoker et al., 2015): (1) full automation, (2) a mass resolving power R = m/Δm of the TOFMS (Tofwerk AG, Switzerland) increased up to 4000 and (3) a fully accessible data format of the mass spectrometric data. Automation in combination with the accessible data allowed an in-depth characterization of the instrument. Mass accuracy was found to be approximately 5 ppm in mean after automatic recalibration of the mass axis in each measurement. A TOFMS configuration giving R = 3500 was chosen to provide an R-to-sensitivity ratio suitable for our purpose. Calculated detection limits are as low as a few femtograms by means of the accurate mass information. The precision for substance quantification was 0.15 % at the best for an individual measurement and in general mainly determined by the signal-to-noise ratio of the chromatographic peak. Detector non-linearity was found to be insignificant up to a mixing ratio of roughly 150 ppt at 0.5 L sampled volume. At higher concentrations, non-linearities of a few percent were observed (precision level: 0.2 %) but could be attributed to a potential source within the detection system. A straightforward correction for those non-linearities was applied in data processing, again by exploiting the accurate mass information. Based on the overall characterization results, the GC-TOFMS instrument was found to be very well suited for the task of quantitative halocarbon trace gas observation and a big step forward compared to scanning, quadrupole MS with low mass resolving power and a TOFMS technique reported to be non-linear and restricted by a small dynamical range.
    In: Atmospheric measurement techniques discussions, Katlenburg-Lindau : Copernicus, 2008-, Band 8 (2015), Seite 9455-9502, 1867-8610
    In: volume:8
    In: year:2015
    In: pages:9455-9502
    In: extent:48
    Language: English
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  • 7
    UID:
    (DE-627)1753105943
    ISBN: 9783030551957
    In: APF (8. : 2020 : Online), Privacy technologies and policy, Cham : Springer, 2020, (2020), Seite 201-, 9783030551957
    In: year:2020
    In: pages:201-
    Language: English
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  • 8
    UID:
    (DE-101)1121909884
    Format: Online-Ressource
    In: In: Atmospheric measurement techniques, 9.2016, S. 179-194, doi:10.5194/amt-9-179-2016
    Language: English
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  • 9
    UID:
    (DE-627)1788685504
    Format: Illustrationen, Tabellen, Diagramme
    ISBN: 9783800756513
    Note: Teil von: Oral Presentation, Session 4: Power System Identification Methods
    In: NEIS Conference on Sustainable Energy Supply and Energy Storage Systems (9. : 2021 : Online), NEIS 2021, Berlin : VDE Verlag, 2021, (2021), Seite 127-132, 9783800756513
    In: year:2021
    In: pages:127-132
    Language: English
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  • 10
    UID:
    (DE-603)42476010X
    ISSN: 1867-8548
    Content: We present the characterization and application of a new gas chromatography time-of-flight mass spectrometry instrument (GC-TOFMS) for the quantitative analysis of halocarbons in air samples. The setup comprises three fundamental enhancements compared to our earlier work (Hoker et al., 2015): (1) full automation, (2) a mass resolving power R = m/Δm of the TOFMS (Tofwerk AG, Switzerland) increased up to 4000 and (3) a fully accessible data format of the mass spectrometric data. Automation in combination with the accessible data allowed an in-depth characterization of the instrument. Mass accuracy was found to be approximately 5 ppm in mean after automatic recalibration of the mass axis in each measurement. A TOFMS configuration giving R = 3500 was chosen to provide an R-to-sensitivity ratio suitable for our purpose. Calculated detection limits are as low as a few femtograms by means of the accurate mass information. The precision for substance quantification was 0.15 % at the best for an individual measurement and in general mainly determined by the signal-to-noise ratio of the chromatographic peak. Detector non-linearity was found to be insignificant up to a mixing ratio of roughly 150 ppt at 0.5 L sampled volume. At higher concentrations, non-linearities of a few percent were observed (precision level: 0.2 %) but could be attributed to a potential source within the detection system. A straightforward correction for those non-linearities was applied in data processing, again by exploiting the accurate mass information. Based on the overall characterization results, the GC-TOFMS instrument was found to be very well suited for the task of quantitative halocarbon trace gas observation and a big step forward compared to scanning, quadrupole MS with low mass resolving power and a TOFMS technique reported to be non-linear and restricted by a small dynamical range.
    In: Atmospheric measurement techniques, Katlenburg-Lindau : Copernicus, 2008-, Band 9 (2016), Seite 179-194, 1867-8548
    In: volume:9
    In: year:2016
    In: pages:179-194
    In: extent:16
    Language: English
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