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  • Health Reference Center Academic (Gale)  (41)
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  • 1
    In: Applied Physiology, Nutrition, and Metabolism, 2015, Vol.40(6), pp.634-635
    Description: Reply to "Discussion: The kinetics of blood lactate in boys during and following a single and repeated all-out sprints of cycling are different than in men - Do children indeed release and remove lactate faster than adults?"
    Keywords: Diet & Clinical Nutrition ; Recreation & Sports;
    ISSN: 1715-5312
    E-ISSN: 1715-5320
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  • 2
    Language: English
    In: Sports Medicine, 2016, Vol.46(12), pp.1939-1952
    Description: BACKGROUND: Runners at various levels of performance and specializing in different events (from 800m to marathons) wear compression socks, sleeves, shorts, and/or tights in attempt to improve their performance and facilitate recovery. Recently, a number of publications reporting contradictory results with regard to the influence of compression garments in this context have appeared.OBJECTIVES: To assess original research on the effects of compression clothing (socks, calf sleeves, shorts, and tights) on running performance and recovery.METHOD: A computerized research of the electronic databases PubMed, MEDLINE, SPORTDiscus, and Web of Science was performed in September of 2015, and the relevant articles published in peer-reviewed journals were thus identified rated using the Physiotherapy Evidence Database (PEDro) Scale. Studies examining effects on physiological, psychological, and/or biomechanical parameters during or after running were included, and means and measures of variability for the outcome employed to calculate Hedges'g effect size and associated 95% confidence intervals for comparison of experimental (compression) and control (non-compression) trials.RESULTS: Compression garments exerted no statistically significant mean effects on running performance (times for a (half) marathon, 15-km trail running, 5- and 10-km runs, and 400-m sprint), maximal and submaximal oxygen uptake, blood lactate concentrations, blood gas kinetics, cardiac parameters (including heart rate, cardiac output, cardiac index, and stroke volume), body and perceived temperature, or the performance of strength-related tasks after running. Small positive effect sizes were calculated for the time to exhaustion (in incremental or step tests), running economy (including biomechanical variables), clearance of blood lactate, perceived exertion, maximal voluntary isometric contraction and peak leg muscle power immediately after running, and markers of muscle damage and inflammation. The body core temperature was moderately affected by compression, while the effect size values for post-exercise leg soreness and the delay in onset of muscle fatigue indicated large positive effects.CONCLUSION: Our present findings suggest that by wearing compression clothing, runners may improve variables related to endurance performance (i.e., time to exhaustion) slightly, due to improvements in running economy, biomechanical variables, perception, and muscle temperature. They should also benefit from reduced muscle pain, damage, and inflammation.
    Keywords: Medicine;
    ISSN: 0112-1642
    E-ISSN: 1179-2035
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  • 3
    In: Journal of Strength and Conditioning Research, 2017, Vol.31(7), pp.1994-1999
    Description: ABSTRACT: Altmann, S, Spielmann, M, Engel, FA, Neumann, R, Ringhof, S, Oriwol, D, and Haertel, S. Validity of single-beam timing lights at different heights. J Strength Cond Res 31(7): 1994–1999, 2017—The purpose of this study was to quantify the effect of different timing light heights on sprint time and the validity of measurement. Two single-beam timing gate systems were used to measure 30-m sprint time (splits at 5 and 10 m) in 15 healthy and physically active male subjects. System 1 was set up at a height of 0.64 m and system 2 at 0.25 m (initial timing light) and 1.00 m (each following timing light), respectively. Participants performed 3 valid trials. The recordings of a high-speed video camera were used as a reference. Sprint times of system 1 and system 2 differed significantly between each other and from the reference system at all distances (p 〈 0.001). Intraclass correlation coefficients and Pearsonʼs r values between both timing light systems and the reference system were low to moderate at 5 and 10 m and moderate to high at 30 m. Bland and Altman analysis revealed that the agreement intervals were considerably higher for the comparison between system 1 and the reference system than for system 2 and the reference system. A valid measurement of splits at 5 and 10 m via the systems used in this study is questionable, whereas 30-m times have an acceptable validity, especially when using system 2. This study confirms the influence of methodological approaches on sprint times. Coaches and researchers should consider that results gained by single-beam timing lights at different heights are not comparable.
    Keywords: Light ; Time ; Running -- Physiology;
    ISSN: 1064-8011
    E-ISSN: 15334287
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  • 4
    Language: English
    In: PLoS ONE, 01 January 2017, Vol.12(7), p.e0181081
    Description: The efficacy of cisplatin-based chemotherapy in cancer is limited by the occurrence of innate and acquired drug resistance. In order to better understand the mechanisms underlying acquired cisplatin resistance, we have compared the adenocarcinoma-derived non-small cell lung cancer (NSCLC) cell...
    Keywords: Sciences (General)
    E-ISSN: 1932-6203
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  • 5
    Language: English
    In: Frontiers in Physiology, 01 July 2018, Vol.9
    Description: 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...
    Keywords: Adolescents ; Physical Fitness ; Aerobic Training ; Peak Oxygen Uptake ; Training Intensity
    E-ISSN: 1664-042X
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  • 6
    In: Applied Physiology, Nutrition, and Metabolism, 2015, Vol.40(6), pp.623-631
    Description: This study characterized the impact of high-intensity interval training on the kinetics of blood lactate and performance in trained boys and men. Twenty-one boys (11.4 ± 0.8 years) and 19 men (29.4 ± 5.0 years) performed a set of four 30-s sprints with 2-min of rest and a single 30-s sprint on 2 separate occasions (randomized order) with assessment of performance. Blood lactate was assayed after each sprint and during 30 min of recovery from both tests. The individual time-curves of blood lactate concentration were fitted to the biexponential function as follows: [LA] ( t ) = [ LA] ( 0 ) + A 1 ( 1 − e − γ 1 t ) + A 2 ( 1 − e − γ 2 t ) , where the velocity parameters γ 1 and γ 2 reflect the capacity to release lactate from the previously active muscle into the blood and to subsequently eliminate lactate from the organism, respectively. In both tests, peak blood lactate concentration was significantly lower in the boys (four 30-s sprints: 12.2 ± 3.6 mmol·L −1 ; single 30-s sprint: 8.7 ± 1.8 mmol·L −1 ) than men (four 30-s sprints: 16.1 ± 3.3 mmol·L −1 ; single 30-s sprint: 11.5 ± 2.1; p 〈 0.001). The boys exhibited faster γ 1 (1.4531 ± 0.65 min; p 〈 0.001) and γ 2 (0.059 ± 0.023 min; p = 0.01) in the single 30-s sprint and faster γ 2 (0.049 ± 0.016 min; p = 0.01) in the four 30-s sprints. The worsening of performance from the first to the last of the four 30-s sprints was less pronounced in boys (9.2% ± 13.9%) than men (19.2% ± 11.5%; p = 0.01). In the present study boys, when compared with men, exhibited lower Peak blood lactate concentration; less pronounced decline in performance during the sprints concomitantly with more rapid release and elimination during the single 30-s sprint; and faster elimination of lactate following the four 30-s sprints.
    Description: Cette étude décrit l’effet d’un entraînement par intervalle d’intensité élevée sur la cinétique du lactate sanguin et la performance chez des garçons et des hommes entraînés. Vingt-et-un garçons (11,4 ± 0,8 ans) et 19 hommes (29,4 ± 5,0 ans) effectuent une série de 4 sprints d’une durée de 30 s avec 2 min de repos et un seul sprint d’une durée de 30 s en deux occasions distinctes (ordre aléatoire) et on évalue la performance. On évalue la concentration sanguine de lactate après chaque sprint et au cours des 30 min de récupération à chaque test. Les courbes individuelles concentration-temps de lactate sanguin sont ajustées à une fonction biexponentielle comme suit : [LA] ( t ) = [ LA] ( 0 ) + A 1 ( 1 − e − γ 1 t ) + A 2 ( 1 − e − γ 2 t ) où les paramètres de la vélocité γ 1 et γ 2 reflètent respectivement la capacité des muscles précédemment actifs à libérer le lactate dans le sang et à l’éliminer de l’organisme par la suite. Dans les deux tests, la concentration sanguine de pointe de lactate est significativement plus faible chez les garçons (4 × 30-s sprint: 12,2 ± 3,6 mmol·L –1 ; 1 sprint de 30 s: 8,7 ± 1,8 mmol·L –1 ) comparativement aux hommes (4 sprints de 30 s: 16,1 ± 3,3 mmol·L –1 ; 1 sprint de 30 s: 11,5 ± 2,1 mmol·L –1 ; p 〈 0,001). Chez les garçons, on observe des valeurs plus élevées de γ 1 (1,4531 ± 0,65 min; p 〈 0,001) et de γ 2 (0,059 ± 0,023 min; p = 0,01) au sprint de 30 s et des valeurs plus élevées de γ 2 (0,049 ± 0,016 min; p = 0,01) aux 4 sprints de 30 s. La diminution de la performance du 1 er au 4 e sprint de 30 s est moins prononcée chez les garçons (9,2 ± 13,9 %) que chez les hommes (19,2 ± 11,5 %; p = 0,01). Comparativement aux hommes, les garçons présentent une plus faible concentration sanguine de pointe de lactate, une diminution moins importante de la performance au sprint concomitamment à une libération et une élimination plus rapide du lactate au cours du sprint isolé de 30 s et une élimination plus rapide de lactate à la suite des 4 sprints de 30 s. [Traduit par la Rédaction]
    Keywords: High Intensive Interval Training ; Children ; Elimination ; Recovery ; Entraînement Par Intervalle D’intensité Élevée ; Enfants ; Élimination ; Récupération
    ISSN: 1715-5312
    E-ISSN: 1715-5320
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  • 7
    Language: English
    In: Frontiers in Physiology, 01 May 2018, Vol.9
    Description: Objectives: To evaluate the immediate responses to forearm compression of blood lactate concentration, heart rate, perceived exertion and local forearm muscle pain during severe climbing in elite climbers.Method: Seven elite climbers (18 ± 2...
    Keywords: Acute Response ; Climbing ; Compression Garments ; Clothing ; External Pressure
    E-ISSN: 1664-042X
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  • 8
    Language: English
    In: Frontiers in Physiology, 01 October 2018, Vol.9
    Description: 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...
    Keywords: Circadian Rhythm ; Repeated Sprint Running ; Repeated Exercise ; Mood ; Fatigue
    E-ISSN: 1664-042X
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  • 9
    Language: English
    In: Frontiers in Psychology, 01 April 2019, Vol.10
    Description: The present study assesses the impact of Kindergarten-based yoga on cognitive performance, visual-motor coordination, and behavior of inattention and hyperactivity in 5-year-old children. In this randomized controlled trial, 45 children (28 female; 17 male; 5.2 ± 0.4 years) participated. Over...
    Keywords: Behavior Modification ; Cognition ; Executive Functions ; Preschool ; Exercise Intervention ; Psychology
    E-ISSN: 1664-1078
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  • 10
    Language: English
    In: Frontiers in Physiology, 01 April 2019, Vol.10
    Description: As verbal encouragement (VE) is used in high intensity functional exercise testing, this randomized controlled crossover study aimed at investigating whether VE affects high intensity functional strength and endurance performance testing. We further examined between-day variability of high...
    Keywords: Verbal Encouragement ; Functional Training ; High Intensity Power Training ; Crossover ; Performance ; Rct
    E-ISSN: 1664-042X
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