TL;DR
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A six-month Australian study of 123 healthy older adults found modest fat loss across three exercise groups. HIIT reduced fat while preserving lean tissue, while moderate exercise also reduced fat but was associated with a small decline in lean mass; the researchers cautioned that the differences were modest and may not be clinically meaningful.
A six-month trial involving 123 healthy adults with an average age of 72 found that high-intensity interval training (HIIT) reduced body fat without the small decline in lean tissue seen with moderate-intensity exercise. The study, published in Maturitas by researchers from the University of the Sunshine Coast, found modest fat loss across all three exercise groups, and its authors cautioned that the measured differences may not be clinically meaningful.
Participants from the Greater Brisbane region were assigned to high-intensity intervals, moderate-intensity exercise or a low-intensity comparison group. Each group completed three supervised, 45-minute gym sessions each week for six months. Researchers measured body composition at the start of the trial, after three months and at the end, using a scanning method that estimates fat and lean tissue.
Both the HIIT and moderate-intensity groups had significant reductions in fat mass, with larger improvements than the low-intensity group. Moderate training was also associated with a small fall in lean muscle, according to lead author and exercise physiologist Dr. Grace Rose. The HIIT group lost fat without a comparable decline in measured lean tissue.
The researchers also reported improvements in the composition of weight carried around the middle in the high- and moderate-intensity groups. Further analysis is needed to interpret the low-intensity results. The study measured lean tissue, not muscle strength directly; lean mass includes muscle as well as other tissues and water, so a change in that measure does not establish an equivalent change in strength or daily function.
Fat Loss Without the Same Lean-Tissue Drop
The finding concerns a distinction relevant to weight loss in later life: changes in body fat and lean tissue can occur together. Lean tissue includes muscle, which supports tasks such as standing from a chair, climbing stairs and keeping balance. The trial found different body-composition results across exercise groups, but did not show that participants became stronger or more independent.
The researchers also examined visceral fat, which is stored deeper in the abdomen around internal organs. Both high- and moderate-intensity groups showed improvements in this measure. Excess visceral fat has been linked with metabolic and cardiovascular problems, but the trial’s reported body-composition changes do not establish that HIIT prevents or treats those conditions.
The study compared exercise approaches in a specific group of participants. The authors described the differences as relatively small and cautioned that they were not clearly clinically meaningful, particularly when measurement uncertainty was taken into account. The report does not establish that HIIT is appropriate for every older adult.
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How the Six-Month Trial Worked
The study focused on exercise intensity and body composition, rather than weight alone. Participants’ average body mass index was about 26 kg/m², which the report described as normal for adults over 65. The three groups followed supervised gym programs, allowing researchers to compare changes after a shared six-month period.
HIIT alternates short periods of demanding activity with easier recovery periods. Associate Professor of Physiology Mia Schaumberg, a study co-author, said the intervals in this trial involved very hard effort, heavy breathing and difficulty holding a conversation, followed by easier activity. That description relates to the protocol studied; it does not provide a safe target for every person.
Rose suggested that HIIT may have helped retain lean tissue because the greater muscular demand may give the body a stronger signal to maintain it. This is the researchers’ proposed explanation, not a mechanism established by the reported body-composition measurements. The trial compared three levels of exercise intensity and did not show that exercise at other intensities has no value.
“We found that high, medium and low intensity exercises all led to modest fat loss but only HIIT retained lean muscle.”
— Dr. Grace Rose, lead author and exercise physiologist at the University of the Sunshine Coast
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Limits of the Body-Composition Findings
The available report does not provide enough detail here to establish how large the changes were in practical terms for individual participants. Researchers cautioned that differences between exercise groups were not clearly clinically meaningful after accounting for measurement uncertainty. The findings therefore do not show that HIIT produces a large or guaranteed advantage.
Scans estimated lean mass rather than muscle function. They cannot by themselves establish whether participants gained or maintained strength, improved mobility, or changed their risk of illness. The report also does not establish whether the effects persist after the supervised program ends, or how they might differ in older adults with health conditions or different starting fitness levels.
The study’s authors described the HIIT result as an advantage in this comparison, but the material provided does not establish that it is the only type of exercise that can help older adults lose fat while retaining muscle. It also does not give enough information to assess how participants were assigned to groups or whether results differed by sex or other characteristics.
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Questions for Future Research
The report says further analysis is needed, including for the low-intensity group’s results. More detailed reporting could clarify the size and uncertainty of the body-composition changes and whether the visceral-fat findings differed in meaningful ways between groups.
Further studies would be needed to determine whether the measured lean-tissue result corresponds to changes in strength, mobility or other outcomes that matter in daily life, and whether benefits continue beyond six months. The report does not announce a follow-up trial or a specific next publication date.
Because the sessions in this study were supervised and the HIIT intervals involved strenuous effort, readers should not treat the protocol as individualized exercise guidance. Older adults considering a demanding exercise program can discuss its suitability with a qualified health professional, particularly if they have health concerns or are not accustomed to strenuous activity.
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Key Questions
What did the study find about HIIT and fat loss?
The 123-person, six-month trial found that HIIT reduced fat mass while maintaining measured lean tissue. The authors described the fat loss across groups as modest, and said the differences may not be clinically meaningful.
Did moderate exercise also reduce fat?
Yes. The moderate-intensity group reduced fat mass, but researchers also recorded a small decline in lean tissue in that group. The low-intensity group had less fat-loss improvement than the high- and moderate-intensity groups.
Did the study prove HIIT improves strength?
No. Researchers measured body composition, not muscle strength directly. Lean mass includes muscle, but also other tissues and water, so the result does not prove a corresponding change in strength or mobility.
What did the researchers find about abdominal fat?
The report says both the high- and moderate-intensity groups improved visceral-fat measures. Visceral fat is stored deeper in the abdomen around internal organs. The reported finding does not prove that exercise in this trial prevented or treated disease.
Does the study mean every older adult should do HIIT?
No. The study compared supervised programs in healthy older adults and does not establish that strenuous intervals suit everyone. The authors also said the measured differences were modest and not clearly clinically meaningful. People considering demanding exercise can discuss suitability with a qualified health professional.
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