Altering Endogenous Carbohydrate Availability to Support Training Adaptations

Author(s):  
Andrew Philp ◽  
Louise M. Burke ◽  
Keith Baar
Diabetes ◽  
1979 ◽  
Vol 28 (9) ◽  
pp. 818-822 ◽  
Author(s):  
D. L. Costill ◽  
P. Cleary ◽  
W. J. Fink ◽  
C. Foster ◽  
J. L. Ivy ◽  
...  

Author(s):  
Hakan Karabiyik ◽  
Mustafa Can Eser ◽  
Ozkan Guler ◽  
Burak Caglar Yasli ◽  
Goktug Ertetik ◽  
...  

Sprint interval training (SIT) is a concept that has been shown to enhance aerobic-anaerobic training adaptations and induce larger effects in hypoxia. The purpose of this study was to examine the effects of 4 weeks of SIT with 15 or 30 s in hypoxia on aerobic, anaerobic performance and critical power (CP). A total of 32 male team players were divided into four groups: SIT with 15 s at FiO2: 0.209 (15 N); FiO2: 0.135 (15 H); SIT with 30 s at FiO2: 0.209 (30 N); and FiO2: 0.135 (30 H). VO2max did not significantly increase, however time-to-exhaustion (TTE) was found to be significantly longer in the post test compared to pre test (p = 0.001) with no difference between groups (p = 0.86). Mean power (MPw.kg) after repeated wingate tests was significantly higher compared to pre training in all groups (p = 0.001) with no difference between groups (p = 0.66). Similarly, CP was increased in all groups with 4 weeks of SIT (p = 0.001) with no difference between groups (p = 0.82). This study showed that 4 weeks of SIT with 15 and 30 s sprint bouts in normoxia or hypoxia did not increased VO2max in trained athletes. However, anerobic performance and CP can be increased with 4 weeks of SIT both in normoxia or hypoxia with 15 or 30 s of sprint durations.


BJS Open ◽  
2021 ◽  
Vol 5 (Supplement_1) ◽  
Author(s):  
◽  
Vigneshwar Raj Veerappan ◽  
Michal Kawka ◽  
Aleksander Dawidziuk ◽  
Sanskrithi Sravanam ◽  
...  

Abstract Introduction The training medical students receive means they can be used as auxiliary healthcare staff during pandemics and disasters. During COVID-10, many medical students volunteered in healthcare settings in clinical and non-clinical capacities. While there has been research into students’ perceptions of the pandemic and their role within the NHS, the perceptions of healthcare staff perceive this student response has not been explored. Methods COVIDAssist is a survey based cross sectional observational study of medical student volunteering during COVID-19. The study consists of a cross sectional survey of doctors & nurses who worked alongside medical students in the NHS during the pandemic. We will use qualitative and quantitative methods to analyze responses. Results The primary objective of the study is to assess how effective student response was in reducing the burden on healthcare teams during the pandemic. Secondary objectives are: to identify the broad specialty (e.g. medicine, surgery, primary care) and healthcare roles medical students were most beneficial) ; the GMC outcome-based skills students exhibited; the training provided to students before volunteering and what additional training could have been provided to students. Conclusion The outcomes of this study will help inform current and future guidance on effective student deployment during pandemics and disasters. The results are also expected to provide insight into necessary training adaptations.


2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Steffen H. Raun ◽  
Carlos Henriquez-Olguín ◽  
Iuliia Karavaeva ◽  
Mona Ali ◽  
Lisbeth L. V. Møller ◽  
...  

2014 ◽  
Vol 24 (4) ◽  
pp. 414-424 ◽  
Author(s):  
Iñigo Mujika ◽  
Trent Stellingwerff ◽  
Kevin Tipton

The adaptive response to training is determined by the combination of the intensity, volume, and frequency of the training. Various periodized approaches to training are used by aquatic sports athletes to achieve performance peaks. Nutritional support to optimize training adaptations should take periodization into consideration; that is, nutrition should also be periodized to optimally support training and facilitate adaptations. Moreover, other aspects of training (e.g., overload training, tapering and detraining) should be considered when making nutrition recommendations for aquatic athletes. There is evidence, albeit not in aquatic sports, that restricting carbohydrate availability may enhance some training adaptations. More research needs to be performed, particularly in aquatic sports, to determine the optimal strategy for periodizing carbohydrate intake to optimize adaptations. Protein nutrition is an important consideration for optimal training adaptations. Factors other than the total amount of daily protein intake should be considered. For instance, the type of protein, timing and pattern of protein intake and the amount of protein ingested at any one time influence the metabolic response to protein ingestion. Body mass and composition are important for aquatic sport athletes in relation to power-to-mass and for aesthetic reasons. Protein may be particularly important for athletes desiring to maintain muscle while losing body mass. Nutritional supplements, such as b-alanine and sodium bicarbonate, may have particular usefulness for aquatic athletes’ training adaptation.


Author(s):  
Jana S. De Wet ◽  
Eileen Africa ◽  
Ranel Venter

Ballet dancers are exposed to chronic high training and performance demands that are associated with overtraining syndrome and injury. Balancing high training loads with recovery to reduce the risk of negative training adaptations is critical. Moreover, the recovery-stress states of professional ballet dancers during training phases of a season are largely unknown. Professional dancers (n = 27) from one classical ballet company in South Africa were monitored for two 8-week phases of a ballet season. A recovery-stress questionnaire for Athletes (RESTQ-76 Sport) was completed weekly during the rehearsal phase (P1) and the performance phase (P2), which took place at the start and the end of the ballet season, respectively. Comparisons were calculated between phases, sexes, and levels of performance with a mixed-model ANOVA and between demographic variables with a one-way ANOVA. The performance phase was signified by lower total recovery (TR, p < 0.01) and higher total stress (TS, p < 0.01) for the group. Female dancers had significantly lower recovery scores than male dancers during P2 (p < 0.01). No differences between levels of performance were found. Subscales previously associated with overreaching and injury were identified in certain groups during P2. In conclusion, P2 was a critical period where dancers, especially females, experienced high stress and low recovery. This could increase the risk for injury and negative training adaptations.


2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Charlie J. Davids ◽  
Truls Raastad ◽  
Lachlan P. James ◽  
Trishan Gajanand ◽  
Emily Smith ◽  
...  

2017 ◽  
Vol 10 (1) ◽  
pp. 214-221 ◽  
Author(s):  
Gavriil G. Arsoniadis ◽  
Petros G. Botonis ◽  
Ioannis S. Nikitakis ◽  
Dimitrios Kalokiris ◽  
Argyris G. Toubekis

Background: The magnitude of long-term changes on aerobic endurance indices provides useful information for understanding any training-induced adaptation during maturation. Objective: The aim of the present study was to compare changes in different aerobic endurance indices within two successive training years. Methods: Eight swimmers, (five male, three female; age: 14.1±1.5, height: 163.8±9.9 cm, body mass: 55.8±10 kg) were tested at four time-points, before and after the 12-week specific preparation period, within two successive training years (at year-1: start-1, end-1, at year-2: start-2, end-2). In each time-point were timed in distances of 50, 200 and 400 m front crawl to calculate the critical speed (CS). Subsequently, performed 5x200 m front crawl progressively increasing intensity and the lactate concentration was determined after each repetition. Using the individual speed vs. lactate concentration curve, the speed corresponding to 4 mmol.L-1 concentration (V4) and the speed corresponding to lactate threshold (sLT) were calculated. Results: Aerobic endurance was increased from year-1 to year-2 (effect of time, p<0.05) and no difference was observed between V4, sLT and CS at all time-points of evaluation (p>0.05). In year-1, V4, sLT and CS were unchanged even after the 12-week period (p>0.05). During year-2 of training it was only V4 that was increased from start-2 to end-2 (p<0.05), whereas sLT and CS were unchanged at the same period (p>0.05). Conclusion: The aerobic endurance indices change similarly throughout a two-year training, independent of the maturation. Possibly, V4 is more sensitive to detect training adaptations during the specific preparation period in young swimmers.


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