Vitamin C Consumption Does Not Impair Training-Induced Improvements in Exercise Performance

2011 ◽  
Vol 6 (1) ◽  
pp. 58-69 ◽  
Author(s):  
Llion A. Roberts ◽  
Kris Beattie ◽  
Graeme L. Close ◽  
James P. Morton
Keyword(s):  
Vitamin C ◽  
Exercise Performance ◽  
High Intensity ◽  
Time Trial ◽  
Interval Training ◽  
Running Economy ◽  
Training Period ◽  
High Intensity Interval Training ◽  
Oxidation Rates ◽  
High Intensity Interval

Purpose:To test the hypothesis that antioxidants can attenuate high-intensity interval training–induced improvements in exercise performance.Methods:Two groups of recreationally active males performed a high-intensity interval running protocol, four times per week for 4 wk. Group 1 (n = 8) consumed 1 g of vitamin C daily throughout the training period, whereas Group 2 (n = 7) consumed a visually identical placebo. Pre- and posttraining, subjects were assessed for VO2max, 10 km time trial, running economy at 12 km/h and distance run on the YoYo intermittent recovery tests level 1 and 2 (YoYoIRT1/2). Subjects also performed a 60 min run before and after training at a running velocity of 65% of pretraining VO2max so as to assess training-induced changes in substrate oxidation rates.Results:Training improved (P < .0005) VO2max, 10 km time trial, running economy, YoYoIRT1 and YoYoIRT2 in both groups, although there was no difference (P = .31, 0.29, 0.24, 0.76 and 0.59) between groups in the magnitude of training-induced improvements in any of the aforementioned parameters. Similarly, training also decreased (P < .0005) mean carbohydrate and increased mean fat oxidation rates during submaximal exercise in both groups, although no differences (P = .98 and 0.94) existed between training conditions.Conclusions:Daily oral consumption of 1 g of vitamin C during a 4 wk high-intensity interval training period does not impair training-induced improvements in the exercise performance of recreationally active males.

Manipulating Carbohydrate Availability Between Twice-Daily Sessions of High-Intensity Interval Training Over 2 Weeks Improves Time-Trial Performance

2015 ◽  
Vol 25 (5) ◽  
pp. 463-470 ◽  
Author(s):  
Andrew J.R. Cochran ◽  
Frank Myslik ◽  
Martin J. MacInnis ◽  
Michael E. Percival ◽  
David Bishop ◽  
...  
Keyword(s):  
Exercise Performance ◽  
High Intensity ◽  
Citrate Synthase ◽  
Time Trial ◽  
Interval Training ◽  
High Intensity Interval Training ◽  
Mitochondrial Content ◽  
Trained Subjects ◽  
High Intensity Interval ◽  
Trial Performance

Commencing some training sessions with reduced carbohydrate (CHO) availability has been shown to enhance skeletal muscle adaptations, but the effect on exercise performance is less clear. We examined whether restricting CHO intake between twice daily sessions of high-intensity interval training (HIIT) augments improvements in exercise performance and mitochondrial content. Eighteen active but not highly trained subjects (peak oxygen uptake [VO2peak] = 44 ± 9 ml/kg/min), matched for age, sex, and fitness, were randomly allocated to two groups. On each of 6 days over 2 weeks, subjects completed two training sessions, each consisting of 5 × 4-min cycling intervals (60% of peak power), interspersed by 2 min of recovery. Subjects ingested either 195 g of CHO (HI-HI group: ~2.3 g/kg) or 17 g of CHO (HI-LO group: ~0.3 g/kg) during the 3-hr period between sessions. The training-induced improvement in 250-kJ time trial performance was greater (p = .02) in the HI-LO group (211 ± 66 W to 244 ± 75 W) compared with the HI-HI group (203 ± 53 W to 219 ± 60 W); however, the increases in mitochondrial content was similar between groups, as reflected by similar increases in citrate synthase maximal activity, citrate synthase protein content and cytochrome c oxidase subunit IV protein content (p > .05 for interaction terms). This is the first study to show that a short-term “train low, compete high” intervention can improve whole-body exercise capacity. Further research is needed to determine whether this type of manipulation can also enhance performance in highly-trained subjects.

Change in VO2max and time trial performance in response to high-intensity interval training prescribed using ventilatory threshold

2018 ◽  
Vol 118 (9) ◽  
pp. 1811-1820 ◽  
Author(s):  
Todd A. Astorino ◽  
Jamie deRevere ◽  
Theodore Anderson ◽  
Erin Kellogg ◽  
Patrick Holstrom ◽  
...  
Keyword(s):  
High Intensity ◽  
Ventilatory Threshold ◽  
Time Trial ◽  
Interval Training ◽  
High Intensity Interval Training ◽  
Time Trial Performance ◽  
High Intensity Interval ◽  
Trial Performance

scholarly journals Roller-Ski Aerobic High-Intensity Interval Training Improves the VO2max and Anaerobic Power in Cross-Country Skiers

2017 ◽  
Vol 6 (2) ◽  
pp. 27-33
Author(s):  
BAHAR ATEŞ ◽  
Ebru ÇETİN
Keyword(s):  
High Intensity ◽  
Anaerobic Power ◽  
Time Trial ◽  
Interval Training ◽  
High Intensity Interval Training ◽  
Time Trial Performance ◽  
Post Test ◽  
Cross Country ◽  
High Intensity Interval ◽  
Trial Performance

The purpose of this study was to investigate the 8-week of roller-ski aerobic high-intensity interval training on aerobic and anaerobic power in cross-country skiers. 10 male [age, 18,28±2,1 years; height, 171,26±4,12 cm; weight, 61,39±6,28 kg] and 8 female [age, 16,05±0.3 years; height, 158,3±6,47 cm; weight, 49,34±0.7 kg]  junior cross-country skiers completed the study. All skiers performed 2x2-km all-out uphill intervals with roller-skis, 3 times a week, in addition to their traditional training program. Measurements included VO2max, anaerobic power, and also for 2-km time-trial performance. All values were listed as pre-to post-test mean [±SD], significant level, and percentage changes [%]. Pre-to post-testing changes in VO2max, anaerobic power, and also 2-km time-trial performance were significantly higher during all post-test trials in all groups [p<0.005]. As a result, we suggest that the skiers should integrate the roller-ski aerobic high-intensity interval uphill models in their training programs for improving performance.

scholarly journals Post-exercise cold water immersion does not alter high intensity interval training-induced exercise performance and Hsp72 responses, but enhances mitochondrial markers

2016 ◽  
Vol 21 (5) ◽  
pp. 793-804 ◽  
Author(s):  
Paula Fernandes Aguiar ◽  
Sílvia Mourão Magalhães ◽  
Ivana Alice Teixeira Fonseca ◽  
Vanessa Batista da Costa Santos ◽  
Mariana Aguiar de Matos ◽  
...  
Keyword(s):  
Exercise Performance ◽  
High Intensity ◽  
Cold Water ◽  
Water Immersion ◽  
Interval Training ◽  
Cold Water Immersion ◽  
High Intensity Interval Training ◽  
Post Exercise ◽  
Mitochondrial Markers ◽  
High Intensity Interval

High-intensity Interval Training Shock Microcycle Improves Running Performance but not Economy in Female Soccer Players

2020 ◽  
Author(s):  
Filippo Dolci ◽  
Andrew E. Kilding ◽  
Tania Spiteri ◽  
Paola Chivers ◽  
Benjamin Piggott ◽  
...  
Keyword(s):  
High Intensity ◽  
Interval Training ◽  
Running Economy ◽  
Soccer Players ◽  
High Intensity Interval Training ◽  
Endurance Running ◽  
Post Intervention ◽  
Change Of Direction ◽  
High Intensity Interval ◽  
Shuttle Run

AbstractThis study aimed to evaluate the effect of high-intensity interval training shock microcycles (HIITSM) on endurance, running economy and change of direction economy in female soccer players. Nineteen sub-elite female soccer players were randomised to two groups: HIITSM (10 HIIT sessions over 13 days) or HIITTRAD (4 HIIT sessions over 13 days) interventions. Endurance performance was evaluated through the 30–15 intermittent fitness test (30–15IFT); running economy over a 5-min treadmill run; and change of direction economy over two conditions: (1) 5-min 20m shuttle run, and (2) 5-min 10m shuttle run. HIITSM significantly improved 30–15IFT scores compared to baseline (+4.4%, p=0.009; d=0.96) and 30–15IFT scores relative to HIITTRAD (p=0.002; d=2.01). There was no significant interaction (group×time) for running economy and change of direction economy. Pre- to post- intervention there was a significant main time effect for blood lactate over 20m and 10m shuttle runs (p<0.001 and p=0.037, respectively), with large (d=0.93) and moderate (d=0.53) changes observed for the HIITSM over the two distances, respectively. HIITSM may be more effective than HIITTRAD to improve 30–15IFT over shorter training periods but may not affect running economy and change of direction economy.

scholarly journals High-Intensity Interval Training in Middle-Distance NCAA Division I 800/1500m Collegiate Athletes

2020 ◽  
Vol 8 (3) ◽  
pp. 28
Author(s):  
Ffion G. Price ◽  
JohnEric W. Smith ◽  
Alana J. Turner ◽  
Ben M. Krings ◽  
Hunter S. Waldman ◽  
...  
Keyword(s):  
High Intensity ◽  
Muscle Activation ◽  
Collegiate Athletes ◽  
Time Trial ◽  
Interval Training ◽  
Performance Tests ◽  
High Intensity Interval Training ◽  
Distance Runners ◽  
High Intensity Interval ◽  
The Impact

Background: High-intensity interval training (HIIT) has grown in popularity, with studies demonstrating improvements in aerobic and anaerobic performances within Sedentary and Recreationally active adults. Little research has been comprised on collegiate, middle-distance runners (800m/1500m). Objective: This research study aimed to investigate the impact of four-weeks HIIT cycling training on collegiate 800/1500m runners performance, and determine whether HIIT can be used as an alternative training method for student athletes. Methods: Twelve middle-distance runners were recruited, with six athletes completing the intervention. Athletes completed pre-testing, which included a 1500m time trial, a GXT, stride length and frequency measurements, and MVIC, using Biopac electromyography (EMG). After pre-testing, athletes completed four weeks of HIIT twice per week. The HIIT consisted of four 20-second bouts with 4 minutes recovery. Following the completion of the training intervention, post-testing was performed for all measures. A paired t-test was used to determine differences between pre- and post-performance tests. An ANOVA was used to determine changes in heart rate and RPE during the GXT. Results: Significant changes were demonstrated between the pre- and post-muscle activation tests of the quadriceps (p=0.05). Significant changes were seen with both HR (p<0.05) and RPE (p<0.05) throughout the GXT. No other significant differences were demonstrated between pre- and post-performance tests, concluding four-weeks HIIT does not alter 800/1500m performance. Conclusion: From the results of this study, HIIT could be used as an alternate method for training for 800/1500m runners. Further reasearch should be conducted toto further understand the impacts of HIIT on middle distance athletes.

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