Rutgers Study Utilizes Specialized MRI to Link Mitochondrial Energy Recovery to Chronic Fatigue in Cancer Survivors

Rutgers researchers use specialized MRI to track mitochondrial recovery in cancer survivors, identifying a potential biological cause for chronic fatigue.

By: AXL Media

Published: Apr 21, 2026, 4:14 AM EDT

Source: Information for this report was sourced from Rutgers University

Measuring the Biological Basis of Post-Treatment Exhaustion

Chronic fatigue remains one of the most pervasive and least understood symptoms reported by cancer survivors, often persisting long after scans have been cleared of disease. Historically, clinicians have relied on subjective surveys to gauge this languor, leaving a significant gap in the objective measurement of a patient's physical capacity. A new pilot study led by Rutgers University, in collaboration with Johns Hopkins and the National Institute on Aging, has utilized phosphorus-31 magnetic resonance spectroscopy (31P-MRS) to move beyond self-reporting. By peering directly into skeletal muscle cells, researchers can now track how quickly mitochondria rebuild energy reserves following physical exertion.

The Mechanics of Mitochondrial Recovery Tracking

The study utilized a validated NIH test where participants performed vigorous knee extensions to deplete their muscular energy stores while inside an MRI scanner. A specialized coil placed over the thigh measured the rate at which the mitochondria regenerated cellular fuel. A longer recovery time is a direct indicator of weakened mitochondrial function. This approach differs significantly from previous research that analyzed blood mitochondrial levels, which senior author Leorey Saligan noted are too volatile to provide a stable biological snapshot. The 31P-MRS technique offers a single-cell-specific look at the biology driving the survivor's daily experience.

Age and Treatment as Predictors of Cellular Fatigue

The pilot cohort, ranging from ages 34 to 70, revealed that age and specific treatment types significantly impact muscle recovery. Participants over 65 years old demonstrated approximately 10 percent slower muscle energy recovery compared to younger survivors, a deficit that correlated with weaker grip strength and lower daily step counts. Furthermore, the study noted that those who had undergone immunotherapy reported higher levels of fatigue and exhibited slower mitochondrial recovery than those who had not. These findings suggest that the intense physiological toll of modern oncology treatments may leave a lasting "energy debt" at the cellular level.