Every AI recommendation in HAVYT is informed by established scientific research. This page documents the peer-reviewed studies, clinical guidelines, and consensus statements that form the foundation of our coaching engine. It is a living document, updated as new evidence is incorporated.
1. Introduction
HAVYT's AI coaching recommendations are built on a foundation of peer-reviewed research, clinical guidelines, and established consensus from sports medicine, exercise science, and chronic disease management. We believe transparency about the science behind our recommendations builds trust and helps users make informed decisions about their training, nutrition, and recovery.
This Support Sources is a living document that is reviewed and updated periodically as new research is incorporated into our AI coaching engine. The sources listed below represent the key studies and guidelines that inform HAVYT's recommendations across all feature domains.
The in-app Support Sources page provides a searchable, filterable database of specific studies with citations. This static page documents the broader scientific methodology and key foundational sources.
2. Exercise Science & Training Methodology
Progressive overload, periodisation, recovery, and cardiovascular training
6 sources
Kraemer WJ, Ratamess NA
"Fundamentals of Resistance Training: Progression and Exercise Prescription"
Medicine & Science in Sports & Exercise, 2004
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American College of Sports Medicine (ACSM) — Position Stand
"Progression Models in Resistance Training for Healthy Adults"
Medicine & Science in Sports & Exercise, 2009
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Schoenfeld BJ
"The Mechanisms of Muscle Hypertrophy and Their Application to Resistance Training"
Journal of Strength and Conditioning Research, 2010
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Meeusen R, Duclos M, Foster C, Fry A, Gleeson M, Nieman D, Raglin J, Rietjens G, Steinacker J, Urhausen A
"Prevention, Diagnosis, and Treatment of the Overtraining Syndrome: Joint Consensus Statement of the European College of Sport Science and the American College of Sports Medicine"
European Journal of Sport Science, 2013
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Halson SL
"Monitoring Training Load to Understand Fatigue in Athletes"
Sports Medicine, 2014
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Garber CE, Blissmer B, Deschenes MR, Franklin BA, Lamonte MJ, Lee IM, Nieman DC, Swain DP
"Quantity and Quality of Exercise for Developing and Maintaining Cardiorespiratory, Musculoskeletal, and Neuromotor Fitness in Apparently Healthy Adults: Guidance for Prescribing Exercise"
Medicine & Science in Sports & Exercise, 2011 — ACSM Position Stand
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3. Nutrition Science
Sports nutrition, protein synthesis, and anti-inflammatory dietary approaches
6 sources
Thomas DT, Erdman KA, Burke LM
"Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance"
Journal of the Academy of Nutrition and Dietetics, 2016
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Stear SJ, Castell LM, Burke LM, Spriet LL
"BJSM Reviews: A–Z of Nutritional Supplements: Dietary Supplements, Sports Nutrition Foods and Ergogenic Aids"
British Journal of Sports Medicine, 2009
Morton RW, Murphy KT, McKellar SR, Schoenfeld BJ, Henselmans M, Helms E, Aragon AA, Devries MC, Banfield L, Krieger JW, Phillips SM
"A Systematic Review, Meta-Analysis and Meta-Regression of the Effect of Protein Supplementation on Resistance Training-Induced Gains in Muscle Mass and Strength in Healthy Adults"
British Journal of Sports Medicine, 2018
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Phillips SM, Van Loon LJ
"Dietary Protein for Athletes: From Requirements to Optimum Adaptation"
Journal of Sports Sciences, 2011
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Calder PC
"Omega-3 Fatty Acids and Inflammatory Processes: From Molecules to Man"
Nutrients, 2010
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Minihane AM, Vinoy S, Russell WR, Baka A, Roche HM, Tuohy KM, Teeling JL, Blaak EE, Fenech M, Vauzour D, McArdle HJ, Kremer BH, Sterkman L, Vafeiadou K, Benedetti MM, Williams CM, Calder PC
"Low-Grade Inflammation, Diet Composition and Health: Current Research Evidence and Its Translation"
British Journal of Nutrition, 2015
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4. Sleep Science
Sleep requirements, muscle recovery, and athletic performance
4 sources
Watson NF, Badr MS, Belenky G, Bliwise DL, Buxton OM, Buysse D, Dinges DF, Gangwisch J, Grandner MA, Kushida C, Malhotra RK, Martin JL, Patel SR, Quan SF, Tasali E
"Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society"
Sleep, 2015
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Dattilo M, Antunes HK, Medeiros A, Monico Neto M, Souza HS, Tufik S, de Mello MT
"Sleep and Muscle Recovery: Endocrinological and Molecular Basis for a New and Promising Hypothesis"
Medical Hypotheses, 2011
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Fullagar HH, Skorski S, Duffield R, Hammes D, Coutts AJ, Meyer T
"Sleep and Athletic Performance: The Effects of Sleep Loss on Exercise Performance, and Physiological and Cognitive Responses to Exercise"
Sports Medicine, 2015
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Walker MP
"Why We Sleep: Unlocking the Power of Sleep and Dreams"
Scribner, 2017 — General Reference
5. Ankylosing Spondylitis & Chronic Inflammatory Conditions
Clinical guidelines, exercise evidence, fatigue management, and related conditions — underpins AS Mode
8 sources
van der Heijde D, Ramiro S, Landewé R, Baraliakos X, Van den Bosch F, Sepriano A, Regel A, Ciurea A, Dagfinrud H, Dougados M, van Gaalen F, Géher P, van der Horst-Bruinsma I, Inman RD, Jongkees M, Kiltz U, Kvien TK, Machado PM, Marzo-Ortega H, Molto A, Navarro-Compán V, Ozgocmen S, Pimentel-Santos FM, Reveille J, Rudwaleit M, Sieper J, Sampaio-Barros P, Wiek D, Braun J
"2016 Update of the ASAS-EULAR Management Recommendations for Axial Spondyloarthritis"
Annals of the Rheumatic Diseases, 2017
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Ward MM, Deodhar A, Gensler LS, Dubreuil M, Yu D, Khan MA, Haroon N, Borenstein D, Wang R, Beg A, Engel A, Engel A, Engel A, Engel A
"2019 Update of the ACR/SAA/SPARTAN Recommendations for the Treatment of Ankylosing Spondylitis and Nonradiographic Axial Spondyloarthritis"
Arthritis & Rheumatology, 2019
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Dagfinrud H, Hagen KB, Kvien TK
"Physiotherapy Interventions for Ankylosing Spondylitis"
Cochrane Database of Systematic Reviews, 2008
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Regel A, Sepriano A, Baraliakos X, van der Heijde D, Braun J, Landewe R, Van den Bosch F, Falzon L, Ramiro S
"Efficacy and Safety of Non-Pharmacological and Non-Biological Pharmacological Treatment: A Systematic Literature Review Informing the 2016 Update of the ASAS/EULAR Recommendations"
RMD Open, 2017
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Millner JR, Barron JS, Beinke KM, Butterworth RH, Chasle BE, Dutton LJ, Harwood MA, Lewington MA, Lim EG, Morley TB, O'Reilly JE, Pickering KA, Sahin NT, Sturrock RD
"Exercise for Ankylosing Spondylitis: An Evidence-Based Consensus Statement"
Seminars in Arthritis and Rheumatism, 2016
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Shen B, Zhang A, Liu J, Da Z, Xu X, Liu H, Gu Z
"Body Image Disturbance and Quality of Life in Chinese Patients with Ankylosing Spondylitis — Fatigue in Ankylosing Spondylitis"
Clinical Rheumatology, 2014
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Martindale J, Smith J, Sutton CJ, Grennan D, Goodacre L, Goodacre JA
"Disease and Psychological Status in Ankylosing Spondylitis"
Journal of Rheumatology, 2006
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Smolen JS, Landewé RBM, Bijlsma JWJ, Burmester GR, Dougados M, Kerschbaumer A, McInnes IB, Sepriano A, van Vollenhoven RF, de Wit M, Aletaha D, Aringer M, Askling J, Balsa A, Boers M, den Broeder AA, Buch MH, Buttgereit F, Caporali R, Cardiel MH, De Cock D, Codreanu C, Cutolo M, Edwards CJ, van Eijk-Hustings Y, Emery P, Finckh A, Gossec L, Gottenberg JE, Hetland ML, Huizinga TWJ, Koloumas M, Li Z, Mariette X, Müller-Ladner U, Mysler EF, da Silva JAP, Poór G, Pope JE, Rubbert-Roth A, Ruyssen-Witrand A, Saag KG, Strangfeld A, Takeuchi T, Voshaar M, Westhovens R, van der Heijde D
"EULAR Recommendations for the Management of Rheumatoid Arthritis with Synthetic and Biological Disease-Modifying Antirheumatic Drugs: 2019 Update"
Annals of the Rheumatic Diseases, 2020
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6. Mental Health, Stress & Mood
Exercise–mood relationship, stress physiology, and anxiety research
4 sources
Rosenbaum S, Tiedemann A, Sherrington C, Curtis J, Ward PB
"Physical Activity Interventions for People with Mental Illness: A Systematic Review and Meta-Analysis"
Journal of Clinical Psychiatry, 2014
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Stubbs B, Vancampfort D, Rosenbaum S, Firth J, Cosco T, Veronese N, Salum GA, Schuch FB
"An Examination of the Anxiolytic Effects of Exercise for People with Anxiety and Stress-Related Disorders: A Meta-Analysis"
Psychiatry Research, 2017
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Cohen S, Janicki-Deverts D, Miller GE
"Psychological Stress and Disease"
JAMA, 2007
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Stults-Kolehmainen MA, Sinha R
"The Effects of Stress on Physical Activity and Exercise"
Sports Medicine, 2014
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