Blood Flow Restriction Compared To High Intensity Interval Training On Power Output And Muscle Strength

Abstract Purpose The present study was conducted to compare the effects of low volume of high intensity interval training (LVHIIT) and high volume of high intensity interval training (HVHIIT) on heart rate variability (HRV) as a primary outcome measure, and on maximum oxygen consumption (VO2max), body composition, and lower limb muscle strength as secondary outcome measures, in sedentary young women. Methods Thirty-six participants were recruited in this study. The LVHIIT group (n = 17) performed one 4-min bout of treadmill running at 85%–95% maximum heart rate (HRmax), followed by 3 min of recovery by running at 70% HRmax, three times per week for 6 weeks. The HVHIIT group (n = 15) performed four times 4-min bouts of treadmill running at 85%–95% HRmax, interspersed with 3-min of recovery by running at 70% HRmax, 3 times per week for 6 weeks. All criterion measures were measured before and after training in both the groups. Results Due to attrition of four cases, data of 32 participants was used for analysis. A significant increase in high frequency (HF) power (p < 0.001) and decrease in the ratio of low frequency to high frequency power (LF/HF) ratio (p < 0.001) in HRV parameters, was observed post-HVHIIT, whereas, these variables did not change significantly (HF: p = 0.92, LF/HF ratio: p = 0.52) in LVHIIT group. Nevertheless, both the interventions proved equally effective in improving aerobic capacity (VO2max), body composition, and muscle strength. Conclusion The study results suggest that both LVHIIT and HVHIIT are equally effective in improving VO2max, body composition, and muscle strength, in sedentary young women. However, HVHIIT induces parasympathetic dominance as well, as measured by HRV.

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Reducing Anxiety and Anxiety Sensitivity With High-Intensity Interval Training in Adults With Asthma

Journal of Physical Activity and Health ◽

10.1123/jpah.2019-0521 ◽

2020 ◽

Vol 17 (8) ◽

pp. 835-839

Author(s):

Carley O’Neill ◽

Shilpa Dogra

Keyword(s):

Anxiety Sensitivity ◽

Power Output ◽

High Intensity ◽

Peak Power ◽

Interval Training ◽

Peak Power Output ◽

Sensitivity Index ◽

High Intensity Interval Training ◽

High Intensity Interval ◽

The Impact

Background: Low- and moderate-intensity exercise training has been shown to be effective for reducing general anxiety and anxiety sensitivity among adults with asthma. Exercise frequency and intensity have been shown to play an integral role in reducing anxiety sensitivity; however, less is known about the impact of high-intensity interval training (HIIT) on anxiety in adults with asthma. Methods: A 6-week HIIT intervention was conducted with adults with asthma. Participants completed HIIT (10% peak power output for 1 min, 90% peak power output for 1 min, repeated 10 times) 3 times per week on a cycle ergometer. Preintervention and postintervention assessments included the Anxiety Sensitivity Index-3 and the Body Sensations Questionnaire. Results: Total Anxiety Sensitivity Index-3 (PRE: 17.9 [11.8]; POST 12.4 [13], P = .002, Cohen d = 0.4, n = 20) and Body Sensations Questionnaire (PRE: 2.4 [1.0]; POST: 2.0 [0.8], P = .007, Cohen d = 0.3) improved from preintervention to postintervention. Conclusion: A 6-week HIIT intervention leads to improved anxiety among adults with asthma. Future research should determine the impact of HIIT among adults with asthma with clinical anxiety.

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Acute Hormonal Responses to High-Intensity Interval Training in Hyperoxia

Journal of Human Kinetics ◽

10.2478/hukin-2019-0137 ◽

2020 ◽

Vol 73 (1) ◽

pp. 125-134

Author(s):

Giorgio Manferdelli ◽

Nils Freitag ◽

Kenji Doma ◽

Anthony C Hackney ◽

Hans-Georg Predel ◽

...

Keyword(s):

Power Output ◽

High Intensity ◽

Training Session ◽

Interval Training ◽

High Intensity Interval Training ◽

Single Session ◽

Maximal Power ◽

Maximal Power Output ◽

Hormonal Responses ◽

High Intensity Interval

AbstractThis study aimed to compare selected hormonal responses to a single session of high intensity interval training performed with an increased fraction of inspired oxygen (hyperoxia) and under normoxic conditions. Twelve recreationally trained men (age 24 ± 3 years) performed two sessions of high intensity interval training on a cycle ergometer, in randomized order with hyperoxia (4 L·min-1 with a flowrate of 94% O2) and normoxia. Each session consisted of 5 intervals of 3 minutes at 85% of the maximal power output, interspersed by 2 min at 40% of the maximal power output. Serum cortisol, prolactin and vascular endothelial growth factor (VEGF) were assessed both before and immediately after each high intensity interval training session. Statistically significant differences in cortisol were found between hyperoxic and normoxic conditions (p = 0.011), with a significant increase in hyperoxia (61.4 ± 73.2%, p = 0.013, ES = -1.03), but not in normoxia (-1.3 ± 33.5%, p > 0.05, ES = 0.1). Prolactin increased similarly in both hyperoxia (118.1 ± 145.1%, p = 0.019, ES = -0.99) and normoxia (62.14 ± 75.43%, p = 0.005, ES = -0.5). VEGF was not statistically altered in either of the conditions. Our findings indicate that a single session of high intensity interval training in low-dose hyperoxia significantly increased cortisol concentrations in recreationally trained individuals compared to normoxia, while the difference was smaller in prolactin and diminished in VEGF concentrations.

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The Effect of Beetroot Ingestion on High-Intensity Interval Training: A Systematic Review and Meta-Analysis

Nutrients ◽

10.3390/nu13113674 ◽

2021 ◽

Vol 13 (11) ◽

pp. 3674

Author(s):

Tak Hiong Wong ◽

Alexiaa Sim ◽

Stephen F. Burns

Keyword(s):

Systematic Review ◽

Power Output ◽

High Intensity ◽

Meta Analysis ◽

Interval Training ◽

High Intensity Interval Training ◽

Mean Power ◽

Nitrate Supplementation ◽

High Intensity Interval ◽

Mean Power Output

Dietary nitrate supplementation has shown promising ergogenic effects on endurance exercise. However, at present there is no systematic analysis evaluating the effects of acute or chronic nitrate supplementation on performance measures during high-intensity interval training (HIIT) and sprint interval training (SIT). The main aim of this systematic review and meta-analysis was to evaluate the evidence for supplementation of dietary beetroot—a common source of nitrate—to improve peak and mean power output during HIIT and SIT. A systematic literature search was carried out following PRISMA guidelines and the PICOS framework within the following databases: PubMed, ProQuest, ScienceDirect, and SPORTDiscus. Search terms used were: ((nitrate OR nitrite OR beetroot) AND (HIIT or high intensity or sprint interval or SIT) AND (performance)). A total of 17 studies were included and reviewed independently. Seven studies applied an acute supplementation strategy and ten studies applied chronic supplementation. The standardised mean difference for mean power output showed an overall trivial, non-significant effect in favour of placebo (Hedges’ g = −0.05, 95% CI −0.32 to 0.21, Z = 0.39, p = 0.69). The standardised mean difference for peak power output showed a trivial, non-significant effect in favour of the beetroot juice intervention (Hedges’ g = 0.08, 95% CI -0.14 to 0.30, Z = 0.72, p = 0.47). The present meta-analysis showed trivial statistical heterogeneity in power output, but the variation in the exercise protocols, nitrate dosage, type of beetroot products, supplementation strategy, and duration among studies restricted a firm conclusion of the effect of beetroot supplementation on HIIT performance. Our findings suggest that beetroot supplementation offers no significant improvement to peak or mean power output during HIIT or SIT. Future research could further examine the ergogenic potential by optimising the beetroot supplementation strategy in terms of dosage, timing, and type of beetroot product. The potential combined effect of other ingredients in the beetroot products should not be undermined. Finally, a chronic supplementation protocol with a higher beetroot dosage (>12.9 mmol/day for 6 days) is recommended for future HIIT and SIT study.

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Speeding of oxygen uptake kinetics is not different following low‐intensity blood‐flow‐restricted and high‐intensity interval training

Experimental Physiology ◽

10.1113/ep087727 ◽

2019 ◽

Vol 104 (12) ◽

pp. 1858-1867

Author(s):

Rogério B. Corvino ◽

Mariana F. M. Oliveira ◽

Benedito S. Denadai ◽

Harry B. Rossiter ◽

Fabrizio Caputo

Keyword(s):

Blood Flow ◽

Oxygen Uptake ◽

High Intensity ◽

Interval Training ◽

Oxygen Uptake Kinetics ◽

Uptake Kinetics ◽

High Intensity Interval Training ◽

Low Intensity ◽

High Intensity Interval

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Acute High-Intensity Interval Training Improves Tvent and Peak Power Output in Highly Trained Males

Canadian Journal of Applied Physiology ◽

10.1139/h02-019 ◽

2002 ◽

Vol 27 (4) ◽

pp. 336-348 ◽

Cited By ~ 30

Author(s):

Paul B. Laursen ◽

Michelle A. Blanchard ◽

David G. Jenkins

Keyword(s):

Oxygen Uptake ◽

Power Output ◽

High Intensity ◽

Peak Power ◽

Ventilatory Threshold ◽

Interval Training ◽

Peak Power Output ◽

Control Group ◽

High Intensity Interval Training ◽

High Intensity Interval

This study examined the effects of four high-intensity interval-training (HIT) sessions performed over 2 weeks on peak volume of oxygen uptake [Formula: see text] the first and second ventilatory thresholds (VT1, VT2) and peak power output (PPO) in highly trained cyclists. Fourteen highly trained male cyclists [Formula: see text] performed a ramped cycle test to determine [Formula: see text]VT1, VT2, and PPO. Subjects were divided equally into a HIT group and a control group. The HIT group performed four HIT sessions (20 × 60 s at PPO, 120 s recovery); the [Formula: see text] test was repeated < 1 wk after the HIT program. Control subjects maintained their regular training program and were reassessed under the same timeline. There was no change in [Formula: see text] for either group; however, the HIT group showed a significantly greater increase in VT1 (+22% vs. −3%), VT2 (+15% vs. −1%), and PPO (+4.3 vs. −4%) compared to controls (all P < .05). This study has demonstrated that HIT can improve VT1, VT2 and PPO, following only four HIT sessions in already highly trained cyclists. Key words: cycling, cyclists, heart rate, oxygen uptake, short-term training, ventilatory threshold

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