High Intensity Interval-Based Cycle Ergometry Training Is Effective at Increasing Exercise Endurance Capacity and Is Well Tolerated by Adults with Cystic Fibrosis

Background: To optimize outcomes in people with cystic fibrosis (CF), guidelines recommend 30 to 60 min of moderate-intensity aerobic exercise on most days. Accumulating this volume of exercise contributes importantly to the substantial treatment burden associated with CF. Therefore, the main aim of this study was to investigate the effects of low-volume high-intensity interval training (HIIT) on exercise capacity in people with CF. Methods: This randomized controlled trial included people with CF aged ≥15 years, who were allocated to either eight weeks of thrice-weekly 10-min sessions of HIIT (experimental group) or eight weeks of weekly contact (control group). Before and after the intervention period, participants completed measurements of time to symptom limitation (Tlim) during a constant work rate cycle ergometry test (primary outcome), and maximal work rate (Wmax) during a ramp-based cycle ergometry test and health-related quality of life (HRQoL). Results: Fourteen participants (median (IQR) age 31 (28, 35) years, forced expiratory volume in 1 second (FEV1) 61 (45, 80) % predicted) were included (seven in each group). Compared to the control group, participants in the experimental group demonstrated a greater magnitude of change in Tlim, Wmax (p = 0.017 for both) and in the physical function domain of HRQoL (p = 0.03). No other between-group differences were demonstrated. Mild post-exercise muscle soreness was reported on a single occasion by four participants. Overall, participants attended 93% of all HIIT sessions. Discussion: Eight weeks of low-volume (i.e., 30-min/week) HIIT produced gains in exercise capacity and self-reported physical function and was well tolerated by people with CF.

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Reduced exertion high-intensity interval training (REHIT) in an adult with Cystic Fibrosis: A mixed-methods case study

Respiratory Medicine Case Reports ◽

10.1016/j.rmcr.2020.101173 ◽

2020 ◽

Vol 31 ◽

pp. 101173

Author(s):

S.P. Aspinall ◽

D.M. Hill ◽

K.A. Mackintosh ◽

M.A. McNarry

Keyword(s):

Cystic Fibrosis ◽

Mixed Methods ◽

High Intensity ◽

Interval Training ◽

High Intensity Interval Training ◽

Mixed Methods Case Study ◽

High Intensity Interval

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Effects of high-intensity interval exercise on muscle fatigue and SR function in rats: a comparison with moderate-intensity continuous exercise

Journal of Applied Physiology ◽

10.1152/japplphysiol.00223.2020 ◽

2020 ◽

Vol 129 (2) ◽

pp. 343-352

Author(s):

Chihiro Aibara ◽

Naoki Okada ◽

Daiki Watanabe ◽

Jiayu Shi ◽

Masanobu Wada

Keyword(s):

Muscle Fatigue ◽

High Intensity ◽

Acute Exercise ◽

Force Production ◽

Moderate Intensity ◽

Endurance Capacity ◽

Interval Exercise ◽

Continuous Exercise ◽

The Past ◽

High Intensity Interval

Over the past decade, high-intensity interval exercise (HIIE) training has received attention as a more efficient training to improve endurance capacity. It is unclear, however, whether the extent of acute exercise-related muscle fatigue differs between HIIE and moderate-intensity continuous exercise, traditional endurance training. Here we provide evidence that restoration of force production takes a longer time after HIIE, which is ascribable to long-lasting depressions in Ca2+ release of the sarcoplasmic reticulum.

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Effort and duration matched ‘High Intensity Interval Training’ using cycle ergometry compared to leg press resistance training

10.31236/osf.io/gkxaf ◽

2019 ◽

Author(s):

Marcelo Henrique Silva ◽

Cláudio André Barbosa de Lira ◽

James Steele ◽

James Fisher ◽

João Felipe Mota ◽

...

Keyword(s):

Resistance Training ◽

Cardiorespiratory Fitness ◽

Lower Limb ◽

High Intensity ◽

Interval Training ◽

Knee Extension ◽

Cycle Ergometry ◽

High Intensity Interval Training ◽

Leg Press ◽

High Intensity Interval

Purpose: Exercises for increasing muscle strength and cardiorespiratory fitness are traditionally prescribed separately, based on the different characteristics of the modalities and the adaptations that each typically promotes. This separation has been questioned by recent studies that suggest that the intensity of effort at which the exercise is performed seems to impart greater influence than the equipment involved. Based on this assumption, it has been proposed that ‘cardio’ training and resistance training might promote similar adaptations as long as effort and duration are equated. The objective of the present study was to compare two ‘High Intensity Interval Training’ protocols matched for effort and duration using different exercise modalities, leg press (resistance training) and cycle ergometry (‘cardio’), upon changes in muscle strength, cardiorespiratory fitness, and lower limb composition in recreationally trained men. Methods: Twenty-five trained men (28.9 ± 5.6 years, 6.6 ± 5.6 years of training experience) were randomly divided into two groups. One group performed sprint interval training on a cycle ergometer (4 sets of 30 seconds sprints) and the other performed leg press (4 sets of 10-12 repetitions to momentary failure). Both groups trained three times a week for 5 weeks. Before and after the training period, the participants performed a 10-repetition maximum (10RM) for knee extension, An incremental exercise test on a treadmill for time to exhaustion (TTE) and peak oxygen consumption (V ̇O2peak), and underwent dual energy X-ray absorptiometry to assess lower limb composition. Results: Knee extension 10RM and TTE increased in both groups with no statistically significant between group difference (p = 0.614 and p = 0.210). There was a statistically significant between group difference for change in V ̇O2peak (p = 0.023) with only the cycle ergometer group showing a significant within group increase. For all lower limb composition outcomes, changes were minimal. Conclusion: The results of the present study suggest that 5 weeks of effort and duration matched ‘High Intensity Interval Training’ using cycle ergometry ‘cardio’ or leg press resistance training may produce similar strength and endurance (TTE) adaptations. However, ‘cardio’ modality training may produce greater increases in cardiorespiratory fitness.

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