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Australian study challenges ‘finite heartbeats’ exercise myth

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Research led by Australian cardiologist André La Gerche reports that fitter people use fewer total heartbeats across a day, thanks to lower average heart rates—even after accounting for workouts. The analysis, published in JACC: Advances and based on elite cyclists, estimates roughly a 10% daily reduction in heartbeats versus less-active peers.

New research published in JACC: Advances counters the notion that exercise “uses up” a limited supply of heartbeats. The study team, which examined elite cyclists, reports that athletes’ average heart rate over 24 hours was about 68 beats per minute (bpm) compared with roughly 76 bpm for non‑athletes—translating to about 97,920 versus 109,440 beats per day, or a reduction of a little over 11,000 beats. (sciencedaily.com)

Professor André La Gerche, who leads the Heart, Exercise & Research Trials (HEART) Laboratory, said the lower round‑the‑clock rate more than offsets the temporary spikes during training. The press materials add that among the fittest participants, resting heart rates could be as low as 40 bpm, well below typical values in the 70–80 bpm range. (sciencedaily.com)

The work directly challenges a popular trope—at times echoed by former U.S. President Donald Trump—that the body is like a battery with finite energy and that exercise depletes it. Independent reporting has documented Trump’s stance, while the new analysis indicates that regular activity is associated with fewer total daily beats and improved efficiency. (washingtonpost.com)

La Gerche’s group emphasizes that consistent, moderate exercise confers the greatest overall health gains, with endurance extremes sometimes increasing daily totals temporarily but not diminishing the broader benefits. The institute’s summary also notes links between physical activity, lower cardiovascular risk and better mental health; these are general associations cited in the release rather than outcomes directly measured by this study. (sciencedaily.com)

Institutionally, the HEART Lab is supported by the St Vincent’s Institute of Medical Research and the Victor Chang Cardiac Research Institute, which jointly back the program’s athlete‑focused investigations into heart function. (svi.edu.au)

Methodology details and the full dataset are contained in the journal article, titled “Balancing Exercise Benefits Against Heartbeat Consumption in Elite Cyclists.” The paper is listed in PubMed and JACC: Advances. (pubmed.ncbi.nlm.nih.gov)

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A healthy adult engaging in a long continuous walk in a park, illustrating the link between extended walking bouts and reduced cardiovascular risk.
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Longer continuous walks linked to sharply lower heart risk, study finds

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Walking in bouts of 10–15 minutes or longer was associated with substantially lower cardiovascular risk among adults taking fewer than 8,000 steps a day, with 15‑minute‑plus bouts tied to about a two‑thirds lower risk than very short walks, according to research published in Annals of Internal Medicine.

Cross-training linked to longer life in long-term studies

A new analysis suggests that varying exercise routines, such as mixing running, cycling, and swimming, may reduce mortality risk by 19 percent compared to less diverse workouts, even when total activity levels are similar. Researchers examined data from over 110,000 U.S. participants tracked for more than three decades. The findings highlight potential benefits of exercise variety, though they remain suggestive rather than conclusive.

Longer uninterrupted walks reduce risks of death and heart disease

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A large UK study of over 33,000 low-activity adults has found that accumulating daily steps in longer, uninterrupted sessions is linked to significantly lower risks of early death and cardiovascular disease, compared to short bursts of walking. The research, published in Annals of Internal Medicine, suggests that how steps are grouped matters as much as total step count for those walking fewer than 8,000 steps per day.

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Modern life clashes with human biology shaped by nature, anthropologists say

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Evolutionary anthropologists argue that human physiology, honed over hundreds of thousands of years for active, nature-rich hunter-gatherer lives, is poorly suited to the chronic pressures of industrialized environments. This mismatch, they say, is contributing to declining fertility and rising rates of inflammatory disease, and should prompt a rethink of how cities and societies are designed.

OHSU study finds short sleep is strongly associated with lower life expectancy across U.S. counties

A new Oregon Health & Science University analysis of U.S. county data from 2019 to 2025 found that regularly getting less than seven hours of sleep per night is associated with shorter life expectancy. In the researchers’ models, the sleep–longevity link was stronger than associations seen for diet, physical activity and social isolation, and was exceeded only by smoking.

Hong Kong researchers identify protein that senses exercise for bone health

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Scientists at the University of Hong Kong have uncovered a protein that acts as an exercise sensor in bones, explaining how movement prevents age-related bone loss. This discovery could lead to drugs mimicking exercise benefits for those unable to stay active. The findings highlight potential new treatments for osteoporosis affecting millions worldwide.

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