The Claim

In men with overweight or obesity, 12 weeks of isoenergetic high-intensity interval training performed three times per week reduces total abdominal fat mass by an average of 12.2%, with running high-intensity interval training producing a greater reduction (−16.1%) than cycling high-intensity interval training (−8.3%), despite comparable total body fat loss, indicating that exercise modality influences regional fat distribution.

Source: Effects of a Cycling versus Running HIIT Program on Fat Mass Loss and Gut Microbiota Composition in Men with Overweight/Obesity

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
60score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

In men with overweight or obesity, 12 weeks of three weekly high-intensity interval training sessions reduces abdominal fat by 12.2% on average, with running training reducing abdominal fat more than cycling training, even when total body fat loss is similar.

See the scientific wording

In men with overweight or obesity, 12 weeks of isoenergetic high-intensity interval training (HIIT) performed three times per week reduces total abdominal fat mass by an average of 12.2%, with running HIIT producing a greater reduction (−16.1%) compared to cycling HIIT (−8.3%), despite similar total body fat loss, suggesting exercise modality influences regional fat distribution.

Why this might work

Running with high intensity causes repeated impacts and strong muscle contractions that push more blood back to the heart and increase blood flow to the belly area. This brings more stress hormones to fat cells in the abdomen, which directly triggers those cells to break down and release stored fat. Cycling does not produce the same level of muscle pumping or blood flow to the belly, so less fat is lost from that area even when the total calories burned are the same.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Effects of a Cycling versus Running HIIT Program on Fat Mass Loss and Gut Microbiota Composition in Men with Overweight/Obesity

    In men with extra weight, doing 12 weeks of intense running or cycling three times a week both burned similar total fat, but running chopped off nearly twice as much belly fat as cycling — even though both workouts burned the same number of calories.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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