What is sarcopenia and why arthritis speeds it up
Sarcopenia is the progressive loss of muscle mass, strength and function that typically accelerates after age 60. Arthritis speeds it up because pain and stiffness cut daily movement, so muscles around painful joints waste faster than in active peers. Weaker muscles then load joints harder — a loop that worsens both problems and raises falls risk.
In UK primary care, slower walking, weaker grip, needing both hands to rise from a chair, or unintentional weight loss are practical flags. They are not a diagnosis on their own, but they are a reason to ask your GP about strength, falls risk and physiotherapy.
Protein targets that support muscle
Many older adults eat too little protein across the day. A practical target for many people is about 1.0–1.2 g of protein per kg of body weight daily, spread over meals, unless a clinician has set a different plan (for example kidney disease). Dairy, eggs, fish, lean meat, tofu, pulses and fortified drinks all count. Pair protein with resistance work — food alone rarely reverses sarcopenia.
Strength training adapted for arthritis
Two to three short sessions a week of sit-to-stand, wall push-ups, resistance-band rows and heel raises usually beat long cardio alone for muscle. Stay below sharp joint pain; mild muscle ache the next day is normal. If a joint is hot and swollen, switch to gentle range-of-motion until the flare settles. Pool work and recumbent bikes help when weight-bearing hurts.
Supplements — what has evidence
Vitamin D (especially in UK winter), creatine and leucine-rich protein have the best support when combined with training. Supplements without strength work rarely rebuild muscle. Check with a pharmacist or GP before starting creatine or high-dose vitamin D if you take other medicines.
How this links to frailty and arthritis care
Sarcopenia sits next to frailty, falls prevention and osteoarthritis exercise programmes. See our frailty management guide and exercise hub for related UK pathways. This page is general information for people in the United Kingdom, not personal medical advice.