How much rest do my muscles need between training sessions as I get older?

As you get older, muscle tissue responds more slowly to training stimuli. This is called anabolic resistance: the muscle essentially needs a higher threshold to grow or become stronger. After illness, hospitalisation or injury, muscles in older adults also demonstrably recover more slowly than in younger people. Training therefore remains worthwhile, but you need to approach it more intelligently.

Large analyses of 119 and 178 studies respectively show that two sessions per week per muscle group is best for muscle growth, and three sessions per week for strength development¹,². This already builds in 48 to 72 hours of rest between sessions. There is no evidence that older adults necessarily need more rest days than this schedule provides, but too little rest is certainly a risk: after true inactivity, older muscles recover with particular difficulty³.

A study in 75-year-olds showed that training heavily twice a week, at around 70% of your maximum weight, produces measurably greater muscle mass and strength after just six weeks⁴. Do you have joint problems? Blood flow restriction training with light weights is an alternative. After twelve weeks it yields comparable muscle growth, although strength development is somewhat slower in the first few weeks.

Nutrition plays a concrete role. Older adults aged 65 and over who increase their protein intake to 1.2 to 1.6 grams per kilogram of body weight per day and also do strength training build significantly more muscle mass than people who only train. That effect is modest but consistent across 62 studies. Creatine supplements can slightly enhance training outcomes, probably by supporting recovery after exertion. Without training they do little for older adults⁵.

There is also early research into a combination of vitamins B3 and B6 as a support for muscle stem cells. In mouse studies this accelerated muscle recovery, and in an observational study of 186 older people it was associated with greater muscle mass and a higher walking speed⁶. Interesting, but not yet tested in large human studies. No practical advice can yet be based on this.