Effect of work:rest cycle duration on fluctuations during intermittent exercise

Combes, Adrien; Dekerle, Jeanne; Bougault, Valérie; Daussin, Frédéric N.

doi:10.1080/02640414.2016.1154591

Cited by 8 publications

(17 citation statements)

References 27 publications

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“…; Combes et al . ) is matched by a similarly attenuated response of intramuscular phosphate metabolism. For example, intermittent exercise with short work bouts (10–30 s) and a low work:recovery ratio is hypothesized to have a relatively greater reliance on depletion of oxymyoglobin and venous oxyhaemoglobin O 2 stores compared to exercise with longer work bouts (Astrand et al .…”

Section: Introductionmentioning

confidence: 92%

“…; Combes et al . ). The magnitude of this mechanical‐to‐metabolic dissociation is dependent on the work:recovery duration, and is greatest when the work periods are short (e.g.…”

Section: Introductionmentioning

confidence: 97%

“…; Combes et al . ). The effect is that homeostasis of

{\dot{V}}_{{normalO}_{2}}

and blood [L − ] is less disturbed during intermittent compared to continuous exercise performed at the same power and accumulating the same volume of work.…”

Section: Introductionmentioning

confidence: 97%

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Dissociating external power from intramuscular exercise intensity during intermittent bilateral knee‐extension in humans

Davies

Benson

Cannon

et al. 2017

The Journal of Physiology

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Key points Continuous high‐intensity constant‐power exercise is unsustainable, with maximal oxygen uptake (V˙O2 max ) and the limit of tolerance attained after only a few minutes.Performing the same power intermittently reduces the O2 cost of exercise and increases tolerance. The extent to which this dissociation is reflected in the intramuscular bioenergetics is unknown.We used pulmonary gas exchange and 31P magnetic resonance spectroscopy to measure whole‐body V˙normalO2, quadriceps phosphate metabolism and pH during continuous and intermittent exercise of different work:recovery durations.Shortening the work:recovery durations (16:32 s vs. 32:64 s vs. 64:128 s vs. continuous) at a work rate estimated to require 110% peak aerobic power reduced V˙normalO2, muscle phosphocreatine breakdown and muscle acidification, eliminated the glycolytic‐associated contribution to ATP synthesis, and increased exercise tolerance.Exercise intensity (i.e. magnitude of intramuscular metabolic perturbations) can be dissociated from the external power using intermittent exercise with short work:recovery durations. AbstractCompared with work‐matched high‐intensity continuous exercise, intermittent exercise dissociates pulmonary oxygen uptake (V˙normalO2) from the accumulated work. The extent to which this reflects differences in O2 storage fluctuations and/or contributions from oxidative and substrate‐level bioenergetics is unknown. Using pulmonary gas‐exchange and intramuscular 31P magnetic resonance spectroscopy, we tested the hypotheses that, at the same power: ATP synthesis rates are similar, whereas peak V˙normalO2 amplitude is lower in intermittent vs. continuous exercise. Thus, we expected that: intermittent exercise relies less upon anaerobic glycolysis for ATP provision than continuous exercise; shorter intervals would require relatively greater fluctuations in intramuscular bioenergetics than in V˙normalO2 compared to longer intervals. Six men performed bilateral knee‐extensor exercise (estimated to require 110% peak aerobic power) continuously and with three different intermittent work:recovery durations (16:32, 32:64 and 64:128 s). Target work duration (576 s) was achieved in all intermittent protocols; greater than continuous (252 ± 174 s; P < 0.05). Mean ATP turnover rate was not different between protocols (∼43 mm min−1 on average). However, the intramuscular phosphocreatine (PCr) component of ATP generation was greatest (∼30 mm min−1), and oxidative (∼10 mm min−1) and anaerobic glycolytic (∼1 mm min−1) components were lowest for 16:32 and 32:64 s intermittent protocols, compared to 64:128 s (18 ± 6, 21 ± 10 and 10 ± 4 mm min−1, respectively) and continuous protocols (8 ± 6, 20 ± 9 and 16 ± 14 mm min−1, respectively). As intermittent work duration increased towards continuous exercise, ATP production relied proportionally more upon anaerobic glycolysis and oxidative phosphorylation, and less upon PCr breakdown. However, performing the same high‐intensity power intermittently vs. continuously reduced the amplitude of fl...

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Section: Introductionmentioning

confidence: 92%

“…; Combes et al . ). The magnitude of this mechanical‐to‐metabolic dissociation is dependent on the work:recovery duration, and is greatest when the work periods are short (e.g.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Dissociating external power from intramuscular exercise intensity during intermittent bilateral knee‐extension in humans

Davies

Benson

Cannon

et al. 2017

The Journal of Physiology

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“…(3) before the effort and after the effort of the experimental group, it emerged that the arithmetic mean of the activity of the SGOT enzyme is (11.87) and the standard deviation is (0.72) in the pre-test, while the arithmetic mean was reached in the post-test of the activity of the enzyme is (12.6) with a standard deviation (0.32), while the calculated T value was (3.15), which is greater than the tabular value, which is 2.26, at a level of significance (0.05) and a degree of freedom (9). This indicates the significant difference between the pre-and post-tests, which indicates To an increase in the activity of the SGOT enzyme in favor of the post, but within the normal limits that range between (9-13 U / L) (3), and this increase is attributed by the researchers to the number of antioxidants that the players took before the physical effort, which contributes to the increase in the activity of enzymes The mitochondria where mixture supply of (A, C, E) To maintain or increase muscle enzymes (4), and that this increase will help the player not to feel tired after physical exertion and not have free radicals. (5) As for the activity of the SGPT enzyme, the arithmetic means reached (7.77) in the pre-test with a standard deviation (0.84), while the arithmetic means in the post-test for the enzyme activity was (8.1) with a standard deviation (0.11), and the calculated T value was (1.54), which is smaller than the tabular value of (2.26) at the level of significance (0.05) and degree of freedom (9), which indicates that the difference is not significant between the pre-and post-tests of the experimental group.…”

Section: Methodsmentioning

confidence: 99%

“…They cause damage to some tissues of the body and reduce the supply of oxygen-rich blood to the tissues that will lead to its death. (3,4) This increase in blood pressure will lead to chemical changes occurring inside the athlete's body, including changes that occur in the enzymes. These changes interpret the presence of damage or ulceration in the muscle that makes the athlete unable to continue with athletic performance or the damage may appear two days after the stressful random exercise.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Antioxidants in Blood Pressure and Free Radicals of Athletes

Mohammed Nader Shalaby,

Sherin Hussien,

Mona Mostafa Abdo Sakoury

et al. 2021

Indian Journal of Forensic Medicine & Toxicology

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Many reports have defined oxidative stress as an imbalance between an enhanced reactive oxygen/nitrogen species and the lack of protective ability in antioxidants. From that point of view, free radical-induced damage caused by oxidative stress seems to be a probable contributing factor to the pathogenesis of many newborn diseases, such as respiratory distress syndrome, bronchopulmonary dysplasia, periventricular leukomalacia, necrotizing enterocolitis, patent ductus arteriosus, and retinopathy of prematurity. This study was conducted on a sample of ( 30) players. researchers used the experimental approach (equivalent groups for its suitability and method of study. the sample was divided into two groups, (15) players representing the control group and (15) players representing the experimental group. the study aims to identify the effect of antioxidants on oxygenated blood pressure and free radicals for athletes. the study showed that there is an effect of antioxidants (vitamins on increasing the activity of the enzyme (SGOT) involved in ATP rebuilding processes, and an effect of antioxidants on reducing oxygen blood pressure while not the effect of antioxidants on SGPT enzyme activity is clear, which shows that it is not involved in reducing free radical, muscle fatigue and blood pressure. Hence, the researchers came out with a set of recommendations, including the need to pay attention to taking vitamins because of their role in reducing the effects of free radicals and emphasizing the gradual increase in training loads.

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