Does success in strength training come down to sex?

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UNSW’s recent research consolidates the results from thirty different restistance training studies involving over 1400 participants giving insight specifically on the result of men and women in the over 50s age bracket. A first in systemic review and meta-analysis, the study dispels previous notions resistance training was more beneficial for males. While men are likely to gain more absolute muscle size, the gains relative to body size are on par to women’s. 

“Historically, people tended to believe that men adapted to a greater degree from resistance training compared to women,” says Dr Amanda (Mandy) Hagstrom, exercise science lecturer at UNSW Medicine & Health and senior author of the study. “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 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. 

“We found no sex differences in changes in relative muscle size or upper body strength in older adults,” says Dr Hagstrom.  “It’s important for trainers to understand that women benefit just as much as men in terms of relative improvement compared to their baseline.”  

Sex-specific workout tips

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Older men tended to build bigger muscles when looking at absolute gains, the researchers found. They were also more likely to see greater absolute improvements to upper and lower body strength.  But when it came to relative lower body strength, older women saw the biggest increases.

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

Photo Credit: Anna Shvets

Longer training durations could also help increase relative and absolute muscle size (for older men) or absolute upper body strength (for older women). 
“Changes to exercise regimes should be made safely and with professional consultation,” says Dr Hagstrom.

Strengthening future health 

Resistance training can offer other health benefits, like increasing a person’s stamina, balance, flexibility and bone density. It has also been shown to help improve sleep, sense of wellbeing, and decrease the risk of injury. 

“Strength training is very important and beneficial to our health – especially for older people,” says Dr Hagstrom.  “It can help prevent and treat many age-related chronic diseases, like diabetes, heart disease and arthritis. Learning more about resistance training and its benefits could help improve overall health outcomes for Australia’s ageing population,” she says.

Photo Credit: Anna Shvets

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