Progressive overload in cardiorespiratory exercise training for young and old: Is increasing duration or intensity of exercise more important?

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Bell, Leo Robert, Worn, Ryan, O’Grady, Mathew William, Denham, Joshua and O’Brien, Brendan Joseph. 2024. "Progressive overload in cardiorespiratory exercise training for young and old: Is increasing duration or intensity of exercise more important?" Medical Hypotheses. 188. https://doi.org/10.1016/j.mehy.2024.111366
Article Title

Progressive overload in cardiorespiratory exercise training for young and old: Is increasing duration or intensity of exercise more important?

ERA Journal ID15322
Article CategoryArticle
AuthorsBell, Leo Robert, Worn, Ryan, O’Grady, Mathew William, Denham, Joshua and O’Brien, Brendan Joseph
Journal TitleMedical Hypotheses
Journal Citation188
Article Number111366
Number of Pages5
Year2024
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0306-9877
1532-2777
Digital Object Identifier (DOI)https://doi.org/10.1016/j.mehy.2024.111366
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0306987724001099
AbstractPeople undertake endurance training to improve their health and cardio-respiratory fitness. Subsequent cardio-respiratory and skeletal muscle aerobic metabolic adaptations are gauged by improvements in maximum or peak oxygen uptake (V?O2peak) and the blood lactate inflection point or threshold during incremental exercise – (LIP). To further improve physiological capability, subsequent homoeostatic disturbances from exercise should be progressively greater in succeeding exercise sessions. Therefore, exercise duration, frequency or intensity should be progressively increased during a training regimen to ensure adaptation potential is realized. A progressive increase in training workload is termed progressive overload . Despite the universal acknowledgment of the importance of progressive overload, it is unclear if systematically progressing altering either exercise intensity or duration (or distance covered) affect cardio-respiratory gains differently in young and older populations. As running faster results in higher heart rates and greater skeletal muscle metabolic stress than running the same distance at a lower speed, in this hypothesis we postulate that progressively increasing exercise run intensity will result in greater mean and higher incidence of V?O2peak and LIP gains in young adults (<50 years). However, the mechanisms that initiate improvements in cardio-respiratory fitness and skeletal muscle aerobic function may be different in older adults due to the inevitable aging decline in cardio-vascular function and mechanical and morphological properties of muscle–tendon units. In older adults (>60 years) we hypothesize progressively increasing run distance while maintaining the same speed will just be as effective as to progressively increasing speed to improve V?O2peak and LIP. To test these hypotheses, we propose a study that compares progressively increasing run intensity to a treatment of progressive matched run distance where speed remains constant in young and old adults. © 2024
KeywordsCardio-vascular fitness; Progressive; Overload; Exercise intensity ; Duration; Running
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020420702. Exercise physiology
Byline AffiliationsFederation University
School of Health and Medical Sciences
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