A new study suggests that the recommended weekly amount of strength training for health benefits may be lower than previously thought, according to research published in a European health journal. The findings, which analyzed data from over 100,000 participants, indicate that as few as 30 minutes of structured strength training per week could significantly reduce the risk of chronic diseases, challenging existing public health guidelines.
“The results highlight the need to revisit current exercise recommendations to ensure they reflect the most up-to-date evidence,” said Dr. Lena Hartmann, a lead researcher on the study. “Even modest amounts of resistance training can have meaningful health impacts.”
Dr. Lena Hartmann, lead researcher, European Journal of Preventive Medicine
The study, conducted over five years, tracked participants’ exercise habits and health outcomes, including cardiovascular health, metabolic markers, and incidence of conditions like diabetes and osteoporosis. Researchers found that individuals who engaged in at least 30 minutes of strength training weekly had a 25% lower risk of developing type 2 diabetes compared to those who did not exercise regularly. The benefits were consistent across age groups and genders.
What the Study Found
The research team emphasized that the findings focus on “structured” strength training, such as weightlifting or resistance band exercises, rather than incidental physical activity like walking or cycling. Participants who performed these activities for 30 minutes weekly showed improvements in muscle mass, bone density, and insulin sensitivity, according to the study’s data.
Notably, the study found no additional health benefits from exceeding 60 minutes of weekly strength training, suggesting that current guidelines—which often recommend 60 to 90 minutes—may be overly cautious. “This doesn’t mean more is always better,” said Dr. Hartmann. “There’s a threshold beyond which the benefits plateau.”
Context and Previous Guidelines
Current global health guidelines, including those from the World Health Organization (WHO), advise adults to engage in at least 150 minutes of moderate-intensity aerobic activity or 75 minutes of vigorous activity weekly, along with muscle-strengthening exercises on two or more days. However, the new study argues that these recommendations may not account for the distinct benefits of resistance training.
Public health officials in the Netherlands, where the research was partially funded, have begun reviewing their national exercise guidelines. “This study provides strong evidence that strength training should be prioritized in public health messaging,” said a spokesperson for the Dutch National Institute for Public Health and the Environment.
Reactions from Health Experts
While the findings have been praised for their methodological rigor, some experts caution against overinterpreting the results. “The study is valuable, but it’s important to note that it’s observational,” said Dr. Marcus Lee, a public health researcher at the University of Copenhagen. “Randomized controlled trials are needed to confirm these associations.”
Dr. Lee also highlighted the importance of combining strength training with aerobic activity for overall health. “No single type of exercise is a panacea,” he said. “A balanced approach remains the gold standard.”
Limitations and Next Steps
The study has several limitations, including reliance on self-reported exercise data, which can be prone to inaccuracies. Additionally, the population studied was predominantly middle-aged and from high-income countries, raising questions about the applicability of the findings to more diverse groups.
Researchers plan to conduct a follow-up study with a more ethnically and socioeconomically diverse cohort. They also aim to explore the long-term effects of sustained strength training on aging populations. “We need to understand how these benefits translate across different demographics,” Dr. Hartmann said.
For now, health professionals advise integrating strength training into weekly routines, even in small doses. “Start with what you can manage,” said Dr. Hartmann. “Consistency is key, and even 30 minutes a week can make a difference.”
