A newly published study has cast fresh doubts over one of fitness culture’s most buzzed-about trends, revealing that repeated cold plunges may significantly stunt gains in muscle growth—by as much as 20%, according to research highlighted by Boing Boing. The findings arrive as ice baths and cold immersion routines surge in popularity among athletes, fitness enthusiasts, and even wellness influencers in Thailand and worldwide.
In recent years, plunging into icy water has been widely marketed for benefits ranging from boosting recovery to enhancing overall well-being. Many fitness centres in Bangkok now offer cold plunge stations, and social media is crowded with testimonials from amateur and professional trainers alike. Yet despite these claims, new research cautions that cold water therapy—particularly when used post-workout—could be counterproductive for those seeking maximum muscle gains.
Researchers behind the latest study conducted controlled experiments comparing muscle growth in subjects who incorporated regular post-exercise cold plunges against those who did not. Over a multi-week period, it was observed that participants who used cold water immersion after strength training consistently built less muscle: up to one-fifth less, compared to their counterparts. While the specific biological mechanisms are still under investigation, scientists speculate that cold exposure may blunt the inflammation and cellular signaling required for muscle repair and growth.
“Cooling down muscles can reduce some markers of inflammation, which might feel good short-term, but muscle hypertrophy relies on necessary inflammatory processes,” explained a university exercise science lecturer, echoing findings in previous papers from journals such as The Journal of Physiology. “For athletes who prioritise performance gains, timing and frequency of cold water immersion should be carefully considered.”
For Thailand’s expanding fitness community, where after-gym ice baths are becoming a staple—particularly in high-end Bangkok gyms and Muay Thai training camps—these findings signal a need to reconsider some recovery practices. Local sports medicine experts have noted an uptick in questions about cold therapy in both recreational and competitive settings. According to a Bangkok-based sports physiotherapist, “Cold plunges might help with acute soreness but could slow long-term muscle adaptation, especially when done regularly after workouts.”
The roots of cold therapy in Thailand go back decades, with traditional herbal saunas often followed by cool rinses in rural wellness retreats. More recently, the Western trend of full-body immersion in ice baths has proliferated, with dedicated cold plunge facilities appearing in Chiang Mai, Phuket, and major tourist destinations catering to both Thais and visiting athletes.
As with many fitness topics, the science is nuanced. While cold plunges can reduce pain and perceived fatigue, current consensus among exercise physiologists is shifting toward recommending heat or active recovery approaches if muscle growth is the primary goal. “Athletes with back-to-back competitions or those managing injuries may still find value in cold immersion,” said an advisor at a Thai Olympic training centre, “but ordinary gym-goers hoping for bigger muscles should avoid routinely jumping into cold baths right after strength training.”
Looking ahead, more research is expected to examine how variables like plunge frequency, water temperature, and timing post-exercise influence outcomes for different types of athletes. Thailand’s fitness industry—blending modern science with traditional wellness—remains well positioned to adapt, with trainers already exploring alternative recovery tools such as Thai massage, dynamic stretching, and herbal compress therapy.
For readers seeking effective ways to build muscle, experts recommend focusing on evidence-based recovery: getting quality sleep, eating a protein-rich diet, and moderating aggressive post-exercise cooling practices. For most people, an occasional cold plunge can be a refreshing treat, but for serious muscle growth, it may be wise to keep the ice baths as a sporadic indulgence rather than a habitual ritual.
Sources: Boing Boing, The Journal of Physiology - Effects of cold water immersion on adaptations to resistance training, Men’s Health - Should You Avoid Cold Showers After a Workout?, Bangkok Post - Thai fitness and wellness trends.