In the RPE level scheme, which disease has early stage RPE of 8/10 and 80% HRmax?

• A. PD
• B. HD
• C. ALS
• D. MS

Answer: (A)

In this RPE level scheme, the combination of a very high perceived effort (8 out of 10) with a substantial but not maximal heart rate (around 80% of HRmax) is used to describe how someone with an early-stage Parkinson’s disease experiences exertion. Parkinson’s often brings motor symptoms such as rigidity and bradykinesia, which make activities feel considerably harder to perform even when the cardiovascular demand is moderate. Autonomic changes can also influence how the heart rate maps onto perceived effort, so patients may report a high level of effort at or near moderate-to-high HR levels. This pattern aligns with the early-stage PD profile in the scheme.

The other diseases—Huntington’s disease, ALS, and multiple sclerosis—tend to show different relationships between exertion and heart rate due to their distinct progression and symptom profiles (such as pronounced rapid fatigue, weakness, or heat sensitivity), which do not match the described early-stage pairing of 8/10 RPE with around 80% HRmax.