450 Formula Upper Extremity Practice Exam

The key idea is that thermotherapy for a hot pack should provide comfortable warmth without risking burns. A safe, effective surface temperature for hot packs is about 40–45°C, which is 104–113°F. At this range the heat rises into the superficial tissues, promoting vasodilation, collagen relaxation, and pain relief, while still being gentle enough to tolerate for typical treatment times (around 15–20 minutes) with careful monitoring. Temperatures higher than this (like 120–130°F or 140–150°F) can cause burns, especially on areas with decreased sensation or when used with a towel or wrap. Temperatures much lower (80–90°F) may feel pleasant but generally don’t provide meaningful therapeutic heating. So the 104–113°F range is the best balance of safety and effectiveness for a hot pack.