Dietary Manipulation for Optimizing Endurance Training Adaptations and Performance: Carbohydrate vs. Fat

2020 ◽  
pp. 292-303
Author(s):  
Jamie Whitfield ◽  
Louise M. Burke
Keyword(s):  
Endurance Training ◽  
Dietary Manipulation ◽  
Training Adaptations ◽  
And Performance

Reduced volume and increased training intensity elevate muscle Na+-K+pump α2-subunit expression as well as short- and long-term work capacity in humans

2009 ◽  
Vol 107 (6) ◽  
pp. 1771-1780 ◽  
Author(s):  
Jens Bangsbo ◽  
Thomas P. Gunnarsson ◽  
Jesper Wendell ◽  
Lars Nybo ◽  
Martin Thomassen
Keyword(s):  
Endurance Training ◽  
Muscle Protein ◽  
Work Capacity ◽  
Control Group ◽  
Muscle Adaptations ◽  
Subunit Expression ◽  
Short And Long Term ◽  
And Performance ◽  
Trained Runners

The present study examined muscle adaptations and alterations in work capacity in endurance-trained runners as a result of a reduced amount of training combined with speed endurance training. For a 6- to 9-wk period, 17 runners were assigned to either a speed endurance group with a 25% reduction in the amount of training but including speed endurance training consisting of six to twelve 30-s sprint runs 3–4 times/wk (SET group n = 12) or a control group ( n = 5), which continued the endurance training (∼55 km/wk). For the SET group, the expression of the muscle Na+-K+pump α2-subunit was 68% higher ( P < 0.05) and the plasma K+level was reduced ( P < 0.05) during repeated intense running after 9 wk. Performance in a 30-s sprint test and the first of the supramaximal exhaustive runs was improved ( P < 0.05) by 7% and 36%, respectively, after the speed endurance training period. In the SET group, maximal O2uptake was unaltered, but the 3-km (3,000-m) time was reduced ( P < 0.05) from 10.4 ± 0.1 to 10.1 ± 0.1 min and the 10-km (10,000-m) time was improved from 37.3 ± 0.4 to 36.3 ± 0.4 min (means ± SE). Muscle protein expression and performance remained unaltered in the control group. The present data suggest that both short- and long-term exercise performances can be improved with a reduction in training volume if speed endurance training is performed and that the Na+-K+pump plays a role in the control of K+homeostasis and in the development of fatigue during repeated high-intensity exercise.

Recovery-Stress States of Professional Ballet Dancers During Different Phases of a Ballet Season

2021 ◽  
Author(s):  
Jana S. De Wet ◽  
Eileen Africa ◽  
Ranel Venter
Keyword(s):  
Mixed Model ◽  
High Stress ◽  
Recovery Stress ◽  
Total Recovery ◽  
Ballet Dancers ◽  
Training Adaptations ◽  
Stress States ◽  
Classical Ballet ◽  
And Performance ◽  
Negative Training

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.

scholarly journals Exercise Training Combined with Bifidobacterium longum OLP-01 Supplementation Improves Exercise Physiological Adaption and Performance

Nutrients ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1145 ◽  
Author(s):  
Wen-Ching Huang ◽  
Yi-Ju Hsu ◽  
Chi-Chang Huang ◽  
Hsuan-Chen Liu ◽  
Mon-Chien Lee
Keyword(s):  
Exercise Training ◽  
Endurance Training ◽  
Physical Performance ◽  
Exercise Performance ◽  
Physiological Stress ◽  
Bifidobacterium Longum ◽  
Gastrointestinal Health ◽  
Exercise Training Program ◽  
Potential Strategy ◽  
And Performance

Probiotics exert multiple health benefits, including gastrointestinal health, immunoregulation, and metabolic disease improvement, by modulating microbiota to maintain eubiosis via the hypothalamic–pituitary–adrenal (HPA) and brain–gut–microbiome axes. Physiological fatigue, mental stress, and gastrointestinal discomfort under the demands of athletic performance as well as immunosuppression are common during endurance training and competition. Limited studies investigated the functional effects of probiotic supplementation on endurance training. Bifidobacterium longum subsp. Longum OLP-01 (OLP-01), isolated from an elite Olympic athlete, was combined with a six-week exercise training program with gradually increasing intensity. In this study, Institute of Cancer Research (ICR) mice were assigned to sedentary, exercise, OLP-01, or exercise + OLP-01 groups and administered probiotic and/or treadmill exercise training for six weeks to assess exercise performance, physiological adaption, and related metabolites. The exercise + OLP-01 group demonstrated higher performance in terms of endurance and grip strength, as well as improved fatigue-associated indexes (lactate, ammonia, creatine kinase (CK), lactate dehydrogenase (LDH), and glycogen content), compared with the other groups. OLP-01 supplementation significantly ameliorated inflammation and injury indexes (platelet/lymphocyte ratio (PLR), aminotransferase (AST), and CK) caused by prolonged endurance exercise test. Moreover, acetate, propionate, and butyrate levels were significantly higher in the exercise + OLP-01 group than in the sedentary and OLP-01 groups. Athletes often experience psychological and physiological stress caused by programed intensive exercise, competition, and off-site training, often leading to poor exercise performance and gastrointestinal issues. Functional OLP-01 probiotics are considered to be a nutritional strategy for improving physiological adaption, oxidative stress, inflammation, and energy balance to ensure high physical performance. Based on these results, probiotics combined with exercise training is a potential strategy for ensuring high physical performance of athletes, which should be further investigated through microbiota validation.

Defining the Volume and Intensity of Sport Participation in Adolescent Rugby Union Players

2008 ◽  
Vol 3 (1) ◽  
pp. 94-106 ◽  
Author(s):  
Timothy B. Hartwig ◽  
Geraldine Naughton ◽  
John Searl
Keyword(s):  
Physical Activity ◽  
Best Practice ◽  
Sport Participation ◽  
Training Session ◽  
Rugby Union ◽  
Gps Tracking ◽  
Training Adaptations ◽  
And Performance ◽  
Tracking Devices ◽  
And Training

Purpose:Investigating adolescent training loads might help us understand optimal training adaptations. GPS tracking devices and training diaries were used to quantify weekly sport and other physical activity demands placed on adolescent rugby union players and profile typical rugby training sessions.Methods:Participants were 75 males age 14 to 18 y who were recruited from rugby teams representing 3 levels of participation: schoolboy, national representative, and a selective sports school talent squad.Results:Schoolboy players covered a distance of (mean ± SD) 3511 ± 836 m, representative-squad players 3576 ± 956 m, and talent-squad players 2208 ± 637 m per rugby training session. The representative squad recorded the highest weekly duration of sport and physical activity (515 ± 222 min/wk), followed by the talent squad (421 ± 211 min/week) and schoolboy group (370 ± 135 min/wk). Profiles of individual players identified as group outliers showed participation in up to 3 games and up to 11 training sessions per week, with twice the weekly load of the team averages.Conclusion:Optimal participation and performance of adolescent rugby union players might be compromised by many high-load, high-impact training sessions and games and commitments to other sports and physical activities. An improved understanding of monitoring and quantifying load in adolescent athletes is needed to facilitate best-practice advice for player management and training prescription.

scholarly journals Does Vitamin C and E Supplementation Impair the Favorable Adaptations of Regular Exercise?

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Michalis G. Nikolaidis ◽  
Chad M. Kerksick ◽  
Manfred Lamprecht ◽  
Steven R. McAnulty
Keyword(s):  
Free Radicals ◽  
Vitamin C ◽  
Redox Homeostasis ◽  
Training Adaptations ◽  
Radical Production ◽  
Physiological Adaptations ◽  
Contradictory Evidence ◽  
And Performance ◽  
Additional Support ◽  
And Training

The detrimental outcomes associated with unregulated and excessive production of free radicals remains a physiological concern that has implications to health, medicine and performance. Available evidence suggests that physiological adaptations to exercise training can enhance the body’s ability to quench free radicals and circumstantial evidence exists to suggest that key vitamins and nutrients may provide additional support to mitigate the untoward effects associated with increased free radical production. However, controversy has risen regarding the potential outcomes associated with vitamins C and E, two popular antioxidant nutrients. Recent evidence has been put forth suggesting that exogenous administration of these antioxidants may be harmful to performance making interpretations regarding the efficacy of antioxidants challenging. The available studies that employed both animal and human models provided conflicting outcomes regarding the efficacy of vitamin C and E supplementation, at least partly due to methodological differences in assessing oxidative stress and training adaptations. Based on the contradictory evidence regarding the effects of higher intakes of vitamin C and/or E on exercise performance and redox homeostasis, a permanent intake of non-physiological dosages of vitamin C and/or E cannot be recommended to healthy, exercising individuals.

scholarly journals Supplement With Whey Protein Hydrolysate in Contrast to Carbohydrate Supports Mitochondrial Adaptations in Trained Runners

2020 ◽  
Author(s):  
Mette Hansen ◽  
Mikkel Oxfeldt ◽  
Anne E. Larsen ◽  
Lise S. Thomsen ◽  
Rokkedal-Lausch Torben ◽  
...  
Keyword(s):  
Cytochrome C ◽  
Endurance Training ◽  
Whey Protein ◽  
Protein Hydrolysate ◽  
Mitochondrial Proteins ◽  
Exercise Session ◽  
Post Intervention ◽  
And Performance ◽  
Whey Protein Hydrolysate ◽  
Trained Runners

Abstract Background: Protein supplementation has been suggested to augment endurance training adaptations by increasing mixed muscle and myofibrillar protein synthesis and lean body mass. However, a potential beneficial effect on mitochondrial adaptations is yet to be clarified.The aim of the present study was to investigate the effect of consuming whey protein hydrolysate before and whey protein hydrolysate plus carbohydrate (PRO-CHO) after each exercise session during a six-week training period compared to similarly timed intake of isocaloric CHO supplements on biomarkers of mitochondrial biogenesis, VO2max and performance in trained runners.Methods: Twenty-four trained runners (VO2max 60.73.7 ml O2 kg-1 min1) completed a six-week block randomized controlled intervention period, consisting of progressive running training. Subjects were randomly assigned to either PRO-CHO or CHO and matched in pairs for gender, age, VO2max, training and performance status. The PRO-CHO group ingested a protein beverage (0.3g kg-1) before and protein-carbohydrate beverage (0.3g protein kg-1 and 1g carbohydrate kg-1) after each exercise session. The CHO group ingested an energy matched carbohydrate beverage. Resting muscle biopsies obtained pre and post intervention were analyzed for mitochondrial specific enzyme activity and mitochondrial protein content. Subjects completed a 6K time trial (6K TT) and a VO2max test pre, midway (only 6K TT) and post intervention. Results: Following six weeks of endurance training Cytochrome C (Cyt C) protein content was significantly higher in the PRO-CHO group compared to the CHO group (p<0.05), with several other mitochondrial proteins (Succinate dehydrogenase (SDHA), Cytochrome C oxidase (COX-IV), Voltage-dependent anion channel (VDAC), Heat shock protein 60 (HSP60), and Prohibitin (PHB1)) following a similar, but non-significant pattern (p=0.07-0.14). β-hydroxyacyl-CoA dehydrogenase (HAD) activity was significantly lower after training in the CHO group (p<0.01), but not in the PRO-CHO group (p=0.24). VO2max and 6K TT was significantly improved after training with no significant difference between groups.Conclusion: Intake of whey PRO hydrolysate before and whey PRO hydrolysate plus CHO after each exercise session during a six-week endurance training period may augment training effects on specific mitochondrial proteins compared to intake of iso-caloric CHO but does not alter VO2max or 6K TT performance.Trial registration: clinicaltrials.gov, NCT03561337. Registered 6 June 2018 – Retrospectively registered.

scholarly journals Training and Competition Readiness in Triathlon

Sports ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 101 ◽  
Author(s):  
Naroa Etxebarria ◽  
Iñigo Mujika ◽  
David Pyne
Keyword(s):  
Large Body ◽  
Long Distance ◽  
Health And Wellbeing ◽  
Training Adaptations ◽  
Risk Of Injury ◽  
Emerging Trends ◽  
Objective Metrics ◽  
Monitoring Training ◽  
And Performance ◽  
External Loads

Triathlon is characterized by the multidisciplinary nature of the sport where swimming, cycling, and running are completed sequentially in different events, such as the sprint, Olympic, long-distance, and Ironman formats. The large number of training sessions and overall volume undertaken by triathletes to improve fitness and performance can also increase the risk of injury, illness, or excessive fatigue. Short- and medium-term individualized training plans, periodization strategies, and work/rest balance are necessary to minimize interruptions to training due to injury, illness, or maladaptation. Even in the absence of health and wellbeing concerns, it is unclear whether cellular signals triggered by multiple training stimuli that drive training adaptations each day interfere with each other. Distribution of training intensity within and between different sessions is an important aspect of training. Both internal (perceived stress) and external loads (objective metrics) should be considered when monitoring training load. Incorporating strength training to complement the large body of endurance work in triathlon can help avoid overuse injuries. We explore emerging trends and strategies from the latest literature and evidence-based knowledge for improving training readiness and performance during competition in triathlon.

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