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 A flow resistive inspiratory muscle training mask worn during high-intensity interval training does not improve 5 km running time-trial performance

2020 ◽  
Author(s):  
Mark A. Faghy ◽  
Peter I. Brown ◽  
Nicola M. Davis ◽  
J. P. Mayes ◽  
Tom M. Maden-Wilkinson
Keyword(s):  
High Intensity ◽  
Time Trial ◽  
Interval Training ◽  
Inspiratory Muscle ◽  
Inspiratory Muscle Training ◽  
High Intensity Interval Training ◽  
Muscle Training ◽  
Time Trial Performance ◽  
High Intensity Interval ◽  
Trial Performance

Abstract Purpose There is little evidence of the ergogenic effect of flow-resistive masks worn during exercise. We compared a flow-resistive face mask (MASK) worn during high-intensity interval training (HIIT) against pressure threshold loading inspiratory muscle training (IMT). Methods 23 participants (13 males) completed a 5 km time trial and six weeks of HIIT (3 sessions weekly). HIIT (n = 8) consisted of repeated work (2 min) at the speed equivalent to 95% $${\dot{\text{V}}}$$ V ˙ O2 peak with equal rest. Repetitions were incremental (six in weeks 1, 2 and 6, eight in weeks 3 and 4 and ten in week 5). Participants were allocated to one of three training groups. MASK (n = 8) wore a flow-resistive mask during all sessions. The IMT group (n = 8) completed 2 × 30 breaths daily at 50% maximum inspiratory pressure (PImax). A control group (CON, n = 7) completed HIIT only. Following HIIT, participants completed two 5 km time trials, the first matched identically to pre-intervention trial (ISO time), and a self-paced effort. Results Time trial performance was improved in all groups (MASK 3.1 ± 1.7%, IMT, 5.7 ± 1.5% and CON 2.6 ± 1.0%, p < 0.05). IMT improved greater than MASK and CON (p = 0.004). Post intervention, PImax and diaphragm thickness were improved in IMT only (32% and 9.5%, respectively, p = 0.003 and 0.024). Conclusion A flow-resistive mask worn during HIIT provides no benefit to 5 km performance when compared to HIIT only. Supplementing HIIT with IMT improves respiratory muscle strength, morphology and performance greater than HIIT alone.

Creatine Monohydrate Supplementation Does Not Augment Fitness, Performance, or Body Composition Adaptations in Response to Four Weeks of High-Intensity Interval Training in Young Females

2017 ◽  
Vol 27 (3) ◽  
pp. 285-292 ◽  
Author(s):  
Scott C. Forbes ◽  
Nathan Sletten ◽  
Cody Durrer ◽  
Étienne Myette-Côté ◽  
D. Candow ◽  
...  
Keyword(s):  
Body Composition ◽  
Insulin Sensitivity ◽  
Cardiorespiratory Fitness ◽  
High Intensity ◽  
Time Trial ◽  
Interval Training ◽  
High Intensity Interval Training ◽  
Time Trial Performance ◽  
High Intensity Interval ◽  
Trial Performance

High-intensity interval training (HIIT) has been shown to improve cardiorespiratory fitness, performance, body composition, and insulin sensitivity. Creatine (Cr) supplementation may augment responses to HIIT, leading to even greater physiological adaptations. The purpose of this study was to determine the effects of 4 weeks of HIIT (three sessions/week) combined with Cr supplementation in recreationally active females. Seventeen females (age = 23 ± 4 yrs; BMI = 23.4 ± 2.4) were randomly assigned to either Cr (Cr; 0.3 g・kg-1・d-1 for 5 d followed by 0.1 g・kg-1・d-1 for 23 days; n = 9) or placebo (PLA; n = 8). Before and after the intervention, VO2peak, ventilatory threshold (VT), time-trial performance, lean body mass and fat mass, and insulin sensitivity were assessed. HIIT improved VO2peak (Cr = +10.2%; PLA = +8.8%), VT (Cr = +12.7%; PLA = +9.9%), and time-trial performance (Cr = -11.5%; PLA = -11.6%) with no differences between groups (time main effects, all p < .001). There were no changes over time for fat mass (Cr = -0.3%; PLA = +4.3%), whole-body lean mass (Cr = +0.5%; PLA = -0.9%), or insulin resistance (Cr = +3.9%; PLA = +18.7%). In conclusion, HIIT is an effective way to improve cardiorespiratory fitness, VT, and time-trial performance. The addition of Cr to HIIT did not augment improvements in cardiorespiratory fitness, performance or body composition in recreationally active females.

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.

scholarly journals Technical feasibility of constant-load and high-intensity interval training for cardiopulmonary conditioning using a re-engineered dynamic leg press

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Farouk Chrif ◽  
Tobias Nef ◽  
Kenneth J Hunt
Keyword(s):  
High Intensity ◽  
Ventilatory Threshold ◽  
Interval Training ◽  
Constant Load ◽  
Work Rate ◽  
High Intensity Interval Training ◽  
Leg Press ◽  
Cardiopulmonary Exercise ◽  
The Difference ◽  
High Intensity Interval

Abstract Background Leg-press devices are one of the most widely used training tools for musculoskeletal strengthening of the lower-limbs, and have demonstrated important cardiopulmonary benefits for healthy and patient populations. Further engineering development was done on a dynamic leg-press for work-rate estimation by integrating force and motion sensors, power calculation and a visual feedback system for volitional work-rate control. This study aimed to assess the feasibility of the enhanced dynamic leg press for cardiopulmonary exercise training in constant-load training and high-intensity interval training. Five healthy participants aged 31.0±3.9 years (mean ± standard deviation) performed two cardiopulmonary training sessions: constant-load training and high-intensity interval training. Participants carried out the training sessions at a work rate that corresponds to their first ventilatory threshold for constant-load training, and their second ventilatory threshold for high-intensity interval training. Results All participants tolerated both training protocols, and could complete the training sessions with no complications. Substantial cardiopulmonary responses were observed. The difference between mean oxygen uptake and target oxygen uptake was 0.07±0.34 L/min (103 ±17%) during constant-load training, and 0.35±0.66 L/min (113 ±27%) during high-intensity interval training. The difference between mean heart rate and target heart rate was −7±19 bpm (94 ±15%) during constant-load training, and 4.2±16 bpm (103 ±12%) during high-intensity interval training. Conclusions The enhanced dynamic leg press was found to be feasible for cardiopulmonary exercise training, and for exercise prescription for different training programmes based on the ventilatory thresholds.

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