A University of Hong Kong study suggests that one weekly session of brisk interval walking can be as effective as three separate sessions for fat loss. The research, published in Nature Communications, focused on 315 adults struggling with abdominal obesity.
The 75-minute interval walking breakthrough
The University of Hong Kong research team found that the total volume of exercise might be more important than how often it is performed. To test this , researchers led by Professor Parco Siu Ming-fai divided 315 participants with abdominal obesity into specific groups. One group performed a single 75-minute interval walking session every week, while another group split that same 75 minutes into three separate workouts spread across the week.
According to the study published in Nature Communications, both groups showed similar improvements in body fat reduction and overall fitness after 16 weeks. The researchers utilized bone density scans to ensure precise measurements of fat-to-muscle ratios, confirming that the single-session group achieved results comparable to those who exercised more frequently. this suggests that for those with limited time, a single, intense bout of interval walking—alternating between very fast walking and short rest periods—can be a viable strategy.
Combating the £11 billion NHS obesity crisis
The findings arrive at a critical time for public health systems , particularly in the United Kingdom. The report from the University of Hong Kong indicates that approximately 66% of adults in the UK are currently classified as overweight or obese. This health crisis carries a massive economic burden , with the NHS spending over £11 billion annually to manage obesity-related issues.
While the study offers a more flexible alternative for busy individuals, it does not contradict current medical guidelines. The NHS continues to advise that adults should aim for at least 150 minutes of moderate-intensity activity every week. However, the ability to see results from a single 75-minute session provides a practical "entry point" for populations that find the standard 150-minute weekly requirement daunting or impossible to schedule .
Why blood pressure and cholesterol levels remained stable
Despite the significant changes in body fat and waist circumference, the study did not observe major shifts in other vital health markers. Specifically, there were no significant changes reported in the participants' blood pressure or cholesterol levels during the 16-week period.
The researchers attributed this lack of movement to the participants' baseline health profiles. because the subjects' initial blood pressure and cholesterol levels were relatively normal, there was less room for statistically significant improvement compared to the more dramatic changes seen in their body composition and visceral fat levels.
The four-month decay of weight-loss benefits
While the study highlights the effectiveness of interval walking, it also raises questions about the long-term sustainability of these results . the researchers noted that while reductions in waistline circumference persisted for at least four months after the intervention ended, the overall benefits regarding weight loss and fat reduction began to diminish over time.
This leaves several critical questions unanswered for those looking to adopt this method. It remains unclear how much longer the waistline benefits last beyond the four-month mark, or what specific frequency of walking is required to prevent the eventual plateau in fat loss.. Furthermore, the study does not address whether these results would differ for individuals who do not start with "relatively normal" blood pressure and cholesterol levels.
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