The latest research on infrared and fitness is increasingly positive, especially around recovery, muscle adaptation, heat acclimation, stress response adaptation, and training efficiency. The science is still evolving, but the trend over the last two to three years has moved from “does it do anything, or what does it do?” to “how should it best be used?” The HOTWORX franchise has been ahead of this research for a few years now.

One of the most important newer studies in 2025 examined repeated post-exercise infrared sauna use in athletes. Researchers found evidence suggesting improvements in neuromuscular performance and muscle hypertrophy adaptations when infrared sauna sessions were consistently paired with training. This is significant because it supports the theory that infrared heat amplifies certain training adaptations rather than merely helping people relax after workouts.

Another emerging area is the effect of infrared heat on recovery stress adaptation. A 2025 study on female athletes found that post-exercise infrared sauna initially elevated cortisol and physiological stress markers, but after six weeks the body adapted and showed improved autonomic nervous system balance and reduced stress response to the same heat exposure. Imagine the effect when exercise is combined with the infrared sauna exposure! In practical terms, this study supports the concept of infrared heat as a form of controlled hormetic stress where the body becomes more resilient over time.

There is also growing support for heat exposure improving endurance adaptation. A major 2025 systematic review evaluating post-exercise heat therapy concluded that repeated heat exposure may improve running performance and heat tolerance, particularly in endurance athletes training in hot environments. While the review noted that evidence quality is still moderate and protocols vary widely, the overall direction of findings leaned positive for chronic adaptation.

One particularly interesting newer finding is that far infrared sauna exposure, like that of a HOTWORX training session, measurably increases muscle temperature without dramatically elevating core temperature. This matters because elevated muscle temperature is associated with increased circulation, tissue elasticity, enzyme activity, and recovery signaling. Researchers observed temperature increases several centimeters into muscle tissue during infrared sauna sessions, supporting the idea that infrared creates a distinct physiological heating effect compared with traditional hot-air heating.

Another rapidly expanding field is photobiomodulation and infrared light’s interaction with mitochondria. A 2025 systematic review on whole-body photobiomodulation suggested potential benefits for exercise recovery and muscular performance through mitochondrial stimulation and cellular energy production pathways. This aligns with growing interest in ATP production and infrared energy influencing cellular metabolism.

At the same time, the newest research is also becoming more scientifically balanced. Researchers are increasingly recognizing that outcomes depend heavily on variables such as:

infrared wavelength,
temperature,
timing relative to exercise,
workout type,
athlete conditioning level,
and consistency of use.

Overall, the strongest positive research trends today support infrared fitness and sauna use for:

improved recovery adaptation,
enhanced heat acclimation,
muscle hypertrophy support,
circulation enhancement,
stress resilience,
flexibility and tissue elasticity,
and improved endurance performance.

The current scientific direction is increasingly validating the broader idea that combining exercise with infrared heat creates a unique training environment that may amplify physiological adaptation beyond exercise alone — especially when used consistently over time rather than as a one-off recovery tool.

Maybe it’s time to consider combining your workout with infrared, or better yet, perform your workouts inside of an infrared sauna!

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(1) https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2025.1462901/full?utm_source=chatgpt.com‍

(2) https://pubmed.ncbi.nlm.nih.gov/40926789/‍

(3) https://pubmed.ncbi.nlm.nih.gov/41032138/

(4) https://pmc.ncbi.nlm.nih.gov/articles/PMC13104632/?utm_source=chatgpt.com

(5) https://pubmed.ncbi.nlm.nih.gov/39883205/