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The XWERKS blog
research
Explore the full collection of articles, research summaries, and practical guides.
HRV Training: Honest Research Review and Practical Framework
HRV-guided training uses daily heart rate variability measurements to inform training decisions. Moderate research support for endurance athletes; less valuable for casual exercisers. Practical...
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Breathwork for Performance: Honest Research Review
Breathwork covers practices with very different evidence bases. Slow controlled breathing has good support; Wim Hof method has mixed evidence and critical safety concerns....
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Nasal Breathing for Athletes: Honest Research Review
Nasal breathing has documented advantages at lower training intensities; performance benefits at higher intensities are more limited. Honest framework respecting airway physics, with practical...
Read articleMouth Taping for Sleep: Honest Research Review with Safety Guidance
Mouth taping for sleep has limited direct research; the practice extrapolates from broader nasal breathing benefits. Critical safety considerations including sleep apnea screening matter...
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Sun Exposure for Testosterone: Honest Research Review
Sun exposure affects testosterone mostly indirectly via the vitamin D pathway, with modest effects in deficient men. The dramatic testicular sun exposure and sunbathing-for-T...
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Blue Light Blocking Glasses: Honest Research Review
Blue light glasses have moderate research support for amber-tinted sleep applications, weak support for daytime eye strain claims. The two get conflated in marketing...
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Grounding/Earthing Benefits: Honest Research Review
Grounding research base is limited and methodologically weak; dramatic biohacker claims far exceed evidence. Outdoor barefoot time is probably modestly beneficial through multiple mechanisms;...
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Red Light Therapy Benefits: Honest Research Review
Red light therapy has real research support for skin conditions, hair regrowth, certain pain, and modest recovery. The dramatic testosterone, muscle, and longevity claims...
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Cold Plunge Benefits: Honest Research Review
Cold plunge has real benefits for mood, alertness, and inflammation, but the dramatic recovery and metabolism claims often exceed the research. Honest review of...
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Resistant Starch Benefits: Honest Research Review
Resistant starch ferments in colon to produce butyrate, supporting gut health. Modest blood sugar and metabolic benefits. The four types and practical food sources.
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Carb Backloading: Research vs. Marketing Honest Review
Carb backloading concentrates carbs in evening post-workout. Theoretical mechanism vs research outcomes. Where it works, where claims exceed evidence.
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Carb Cycling for Fat Loss: Honest Research Review
TL;DR Carb cycling means strategically alternating high-carb and low-carb days based on training intensity, theoretical hormonal advantages, or psychological sustainability. Real concept; marketing often...
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