Resistance training benefits both older women and older men

January 7, 2021

Men and women aged over 50 can reap similar relative benefits from resistance training, a new study led by UNSW Sydney shows.

While men are likely to gain more absolute muscle size, the gains relative to body size are on par to those achieved by women.

The findings, recently published in Sports Medicine, consolidated the results of 30 different resistance training studies involving over 1400 participants. This paper specifically compared the results of men and women aged 50 and over.

Dr Amanda Hagstrom (pictured below), Exercise Science Lecturer at UNSW Medicine & Health and senior author of the study, explained “historically, people tended to believe that men adapted to a greater degree from resistance training compared to women.

“The differences we found primarily relate to how we look at the data – that is, absolutely or relatively. ‘Absolute’ looks at the overall gains, while ‘relative’ is a percentage based on their body size.”

The paper is the first systematic review and meta-analysis to examine whether older men and women reap different resistance training results. The findings add to past research on differences in younger adults (18-50), which suggested that men and women can achieve similar relative muscle size gains.

The researchers compared muscle mass and strength gains in 651 older men and 759 older women across the 30 studies. The participants were aged between 50 and 90, with most having no prior resistance training experience.

While 50 is not typically considered an ‘older adult’, it was selected as the threshold for this study given the potential for menopausal hormone changes to influence resistance training outcomes.

Dr Hagstrom noted “we found no sex differences in changes in relative muscle size or upper body strength in older adults.

“It’s important for trainers to understand that women benefit just as much as men in terms of relative improvement compared to their baseline.”

With the researchers finding that older men tending to build bigger muscles when looking at absolute gains, it was found they were also more likely to see greater absolute improvements to upper and lower body strength.

However, when it came to relative lower body strength, older women saw the biggest increases.

Dr Hagstrom added “our study sheds light on the possibility that we should be programming differently for older men and women to maximise their training benefits.

“Older men might benefit from higher intensity programs to improve their absolute upper and lower body strength.

“But older women might benefit from higher overall exercise volumes - that is, more weekly repetitions - to increase their relative and absolute lower body strength.”

Noting that feeling stronger and having bigger muscles aren’t the only benefits to resistance training, Dr Hagstrom concluded “strength training is very important and beneficial to our health – especially for older people.

“It can help prevent and treat many age-related chronic diseases, like diabetes, heart disease and arthritis.”

Click here to view the research.

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