The scale did not move. almost everything else did. That is the finding worth carrying out of this meta-analysis of 23 randomized trials of supervised exercise in older women. Body weight: unchanged. Waist circumference: unchanged. Meanwhile LDL cholesterol fell by nearly 24 mg/dL and systolic blood pressure by more than 8 mmHg. If you judge an exercise program by the bathroom scale, this is the study that explains why you keep concluding it failed.
The lipid and metabolic numbers. Total cholesterol dropped -26.67 mg/dL (95% CI -34.92 to -18.42). LDL-C fell -23.77 mg/dL, triglycerides -8.56 mg/dL, fasting glucose -5.59 mg/dL, and C-reactive protein - a general inflammation marker - -0.86 mg/L. The LDL change is in the range people often reach for a starting dose of medication to achieve.
Fitness and blood pressure. VO2peak rose +2.78 mL/kg/min (95% CI 1.87 to 3.70). Systolic blood pressure fell -8.35 mmHg and diastolic -3.26 mmHg. Aerobic capacity is one of the strongest single predictors of mortality in older adults, and one of the few that still responds to training at any age.
What happened to body composition. Body fat percentage fell -2.47%. Body weight, trunk fat mass, waist circumference, fat-free mass and skeletal muscle mass showed no significant change. Read those two sentences together and the mechanism is obvious: fat came off, muscle stayed on, and net weight barely budged. That is a good outcome being hidden by a bad measurement.
How strong is it? Here is where the honesty belongs. Under GRADE, the evidence was moderate certainty for total cholesterol, triglycerides, body fat percentage, VO2peak and systolic blood pressure - and low certainty for everything else, including LDL, glucose and CRP. So the headline LDL number, striking as it is, rests on weaker footing than the total-cholesterol result. Twenty-three trials is a decent base, but supervised-exercise trials are short, hard to blind, and recruit people willing to be supervised in the first place.
Which exercise? The review pooled aerobic, resistance and combined programs and did not crown a winner. That is arguably the most liberating result in the paper: there was no magic modality. The trials that worked were the ones people actually did, under supervision, for months.
The practical read. For an older woman starting from a sedentary baseline, the return on training here is large, and it shows up in blood work and blood pressure within months - not on the scale, and possibly never on the scale. Pick the format you will keep doing, get it supervised early if you can, and track the numbers that actually moved in these trials.
Medical note. This article is intended for general educational purposes and is not a substitute for professional medical advice. Talk to a healthcare provider before starting a new exercise program, particularly if you have existing cardiovascular disease.