The Execute section of this learning unit on Photobiomodulation (PBM) is designed to immerse students in active, hands-on learning, bridging the gap between theoretical knowledge and practical experience. While the previous section introduces the fundamental principles of PBM, including the interaction of red and near-infrared light with biological tissues, the Execute section allows students to observe these concepts in action, providing a tangible understanding of how PBM affects cells, tissues, and biological systems.

Through carefully structured activities, students will have the opportunity to conduct experiments, make detailed observations, and analyze outcomes. For example, they might explore how different wavelengths of light penetrate tissue models, or how PBM influences cellular activity in controlled environments. This experiential approach encourages learners to actively engage with the material, fostering critical thinking, curiosity, and scientific reasoning.

In addition, the section emphasizes discussion and reflection, prompting students to compare their experimental results with theoretical predictions and to consider real-world applications of PBM, from clinical therapies to wellness practices. By combining observation, experimentation, and guided dialogue, the Execute section transforms abstract concepts into meaningful, memorable learning experiences. 

Ultimately, students will leave this section with a deeper appreciation for both the scientific principles and practical relevance of photobiomodulation, preparing them to apply this knowledge in research, healthcare, or further studies.

Activity 1: Observing Light

Use a prism or colored filters to explore how light behaves. Observe which colors pass through materials and which are blocked. Record your observations in a table, noting the color, penetration potential, and notes. 

This simple activity helps students understand why red and NIR light can reach deep tissues.

Discuss in groups: How does this relate to PBM? Why might certain wavelengths be more effective for healing than others?

Activity 2: Mitochondria Analogy

Build a simple “cell factory” model using paper cups, balls, or other small objects to represent ATP molecules. Use a red flashlight to simulate PBM light. Watch as the “factory” produces more ATP under the light. Reflect on how extra energy helps repair processes in the body.

Write a short narrative describing the model: How does this analogy help you understand mitochondria activation? What happens when energy is low?

Activity 3: Case Studies

Investigate PBM applications in clinics or sports:
•    Post-injury muscle recovery
•    Dental swelling reduction
•    Skin wound healing

For each case, write a brief report: What was the problem? How was PBM applied? What was the outcome? Discuss why PBM was effective in these scenarios and relate it to cellular energy production.

Activity 4: Designing a PBM Device

Students collaborate to design a hypothetical PBM device:
•    Choose wavelength (red or NIR)
•    Decide on intensity and duration
•    Predict which tissues would benefit most

Present designs to the class, justifying choices based on what you learned about light penetration, mitochondria, and ATP production.

Activity 5: Extended Reflection

Imagine a scenario where PBM could improve daily life: post-sport recovery, minor injuries, or even study-related stress (through muscle tension relief). Write a narrative connecting theory to application, encouraging deeper understanding and personal engagement.