Exercise intensity classification in cancer patients undergoing allogeneic HCT

Area of Science:

• Cardiovascular Physiology
• Exercise Science
• Oncology

Background:

• Exercise interventions improve outcomes for cancer patients.
• Current exercise intensity guidelines are generalized from healthy populations.
• Intensive treatments like allogeneic hematopoietic stem cell transplantation (allo-HCT) can alter cardiovascular responses to exercise.

Purpose of the Study:

• To evaluate the relationship between exercise intensity measures (%V˙O2R, %HRR, %HRmax, %V˙O2max) in cancer patients before and after allo-HCT.
• To compare calculated exercise intensities with American College of Sports Medicine (ACSM) recommendations.

Main Methods:

• Utilized data from a randomized controlled trial, measuring patients before and 180 days after allo-HCT.
• Included patients who achieved maximal effort during incremental cycling tests.
• Calculated individual regression lines with %V˙O2 reserve (%V˙O2R) as the reference and compared with ACSM values.

Main Results:

• Before allo-HCT, %HRR was lower and %HRmax/%V˙O2max were higher than ACSM values (P < 0.01).
• 180 days post-allo-HCT, %HRR was similar to ACSM values (except 90%, P = 0.01), while %HRmax/%V˙O2max remained higher (P < 0.05).
• Beta-blockers did not influence calculated exercise intensities.

Conclusions:

• ACSM exercise intensity recommendations may not be appropriate for cancer patients during and 180 days post-allo-HCT.
• Patients may not achieve targeted intensity classes using current ACSM guidelines.
• Exception noted for %HRR 180 days after allo-HCT.