The Research

Providing evidence can be a challenging thing when it comes to the human body.

Advanced understanding of physics and chemistry over the past few decades has allowed us to look at how our body works all the way down to the biomolecular level. Modern medicine was built upon the foundation of reductionism – breaking down our entire body and categorizing it into smaller systems, and continuing to reduce those systems down until we are at a cellular/molecular level. This reductionism has also paired nicely with the way Newton looked at the world – as one big machine.

This is the level on which most studies are conducted on – reducing complex systems into simple parts paired with viewing the body as a sum of its parts.

On a cellular level, we can say with a lot of certainty how we work.

It’s clear to us.

In fact, it’s so clear we can create powerful drugs that target specific cells and their function – yet when we start reversing this thinking and begin to piece the body back together again…this is where things get fuzzy.

This “putting the puzzle back together again” is where we start to move away from solid fact and into this unknown territory that is left wide open to opinions because the variables are often too numerous to study and research with the accuracy we have when we zoom in on single-cell functions.

The more we start looking at how these trillions of cells add up to form various systems that all depend and rely on each other to help our body function, the more complex things become, and the harder it is to study and research.

When we zoom out and study how all the systems interact as a whole, we can begin to see how muscles in the legs influence the ability for us to digest food. How our ability to digest food affects our energy levels and hormone regulation and vice versa. How our ability to regulate hormones impacts our mood. How our mood impacts our mental health. How our mental health impacts our respiratory and circulatory system. And then further how all of this impacts our movement… and the complicated cycle of cause and effect, action and reaction continues.

We can only conduct studies in an attempt to find information that moves us closer to a place or certainty.

When it comes to the experts within the medical community, the word “evidence” is rarely used because most experts know that the way we study the body is mainly suggestive, not absolute.

We all have something we are looking for that will be the thing to convince us that something is true or not.

Some people need photographic evidence, others need video evidence, some need peer reviewed studies, some need the raw data behind those studies because they don’t trust the variables in which the studies were conducted…and most of us just need to experience a change before our mind can be convinced.

That being said…

I created this page specifically so You can find the evidence you are looking for. These are just some of the resources in which I’ve pulled information from over the past decade to help people heal from chronic pain and movement dysfunctions.


Andersson GBJ, Ortengren R, Herberts P. Quantitative electromyographic studies of back muscle activity related to posture and loading. Otrhop Clie North Am 1977;8:85

Barun N, Arora N, Rochester D. Force-length relationship of the normal human diaphragm. J Apple Physiol 1982; 52 (2):4405-412

Basmajian JV. Electromyography of two-joint muscles Anat Rec 1957;129:371

Basmajian JV. Electromyography of iliopsoas. Anat Rec 1958;132:127

Bender JA, Kaplan HM. The multiple angle testing method for the evaluation of muscle strength. J Bone Joint Surg [AM] 1963;45-A:135

Black SA. Clinical applications in muscle testing. Rehab Man 1990;3(1):30,32,61.

Blackburn SE, Portney LG. Electromyographic activity of back muscular during Williams’ flexion exercises. Phys There 1981;61:878

Bohannon RW. Cinematographic analysis of the passive straight-leg-raising test for hamstring muscle length. Phys Ther 1982;62(9):1269-1274

Bohannon RW, Gajdosik RL, LeVeau BF. Contribution of pelvic and lower limb motion to increases in the angle of passive straight leg raising. Phys There 1985;65(4)474-476

Breig A, Troup JDG. Biomechanical consideration in the straight-leg-raising test. Spine 1979;4(3):242-250

Bullock-Saxton J. Normal and abnormal postures in the sagittal plane and their relationship to low back pain. Physiother Pract 1988;4(2);94-104

Campbell EJM. The respiratory muscles and the mechanics behind breathing. Chicago: Year Book, 1958.

Cassella MC, Hall JE. Current treatment approaches in the nonoperative and operative management of adolescent idiopathic scoliosis. Phys There 1991;71:12.

Close RI. Dynamic properties of mammalian skeletal muscles. Physiol Rev 1972;52:129.

Cooperman JM/ Cas studies: isolated strain of the tensor fasciae late. J Orthop Sports Phys Ther 1983;5(4):201-203

Cram JR, Steger JC Biofeedback and Self-regulation, 31 May 1983, 8(2):229-241 DOI: 10.1007/bf00998853 PMID: 6227339 

Currier DP. Maximal isometric tension of the elbow extensors at varied positions. Phys There 1972;52:148.

Currier DP. Positions for knee strengthening exercises. Phys There 1977;57:148.

Currier DP. Positions for knee strengthening exercises. Phys There 1977;57:148.

Dael, N., Mortillaro, M., & Scherer, K. R. (2012). Emotion expression in body action and posture. Emotion, 12(5), 1085–1101. 

DeLuca CJ, Forrest WJ. Force analysis of individual muscles acting simultaneously on the shoulder joint during isometric abduction. J Biomech 1973;6:385.

DeSousa OM, Berlin F, Berardi AC. Electromyographic study of the pectorals major and latissimus doors during medial rotation of the arm. Electromyography. 1969;9:407

Farfan HF. Muscular mechanism of the lumbar spine and the position of power and efficiency. Orthop Clie North Am 1975;6:135

Frank JS, Earl M. Coordinatino of posture and movement. Phys There 1990;70(12):855-863.

Gajdosik R, Lusin G.L Hamstring muscle tightness. Phys There 1983;63(7):108501090.

Goldberg CJ, Dowling FE. Idiopathic scoliosis and asymmetry of form and function. Spine 1991;16(1):84-87.

Gollnick, P.D. & Matoba, H. 1984. The muscle fiber composition of skeletal muscle as a predictor of athletic success: an overview. The American Journal of Sports Medicine. 12(3):212-217. DOI:

Gowitzke BA, Milner MM. Understanding the scientific basis of human motion. 2nd ed. Baltimore: Williams & Wilkins, 1980.

Gray ER. The role of leg muscles in variations of the arches in normal and flat feet. J. AM Phys Ther Assoc 1969;49:1084.

Guffey JS/ A critical look at muscle testing. Clie 1991;11(2);15-19.

Harrison DD, Harrison DE, Janik TJ, Cailliet R, Haas JW, Ferrantelli J, Holland B. Modeling of the Sagittal Cervical Spine as a Method to Discriminate Hypo-Lordosis: Results of Elliptical and Circular Modeling in 72 Asymptomatic Subjects, 52 Acute Neck Pain Subjects, and 70 Chronic Neck Pain Subjects. Spine 2004; 29(22):2485-2492.

Harrison DE, Janik TJ, Harrison DD, Cailliet R, Harmon S. Can the Thoracic Kyphosis be Modeled with a Simple Geometric Shape? The Results of Circular and Elliptical Modeling in 80 Asymptomatic Subjects. J Spinal Disord Tech 2002; 15(3): 213-220.

Harrison DD, Cailliet R, Janik TJ, Troyanovich SJ, Harrison DE, Holland B. Elliptical Modeling of the Sagittal Lumbar Lordosis and Segmental Rotation Angles as a Method to Discriminate Between Normal and Low Back Pain Subjects. J Spinal Disord 1998; 11(5): 430-439.

Hart DL, Stobbe TJ, Jaraiedi M. Effect of lumbar posture on lifting. Spine 1987;12(2):1023-1030.

Hicks JH. The three weight-bearing mechanisms of the foot. In: Evans FG. Biomechanical studies of the musculoskeletal system. Springfield, Illinois: Charles C Thomas, 1961.

Holloszy, J.O., Oscai, L.B., Molé, P.A. & Don, I.J. 1971. Biochemical adaptations to endurance exercise in skeletal muscle. In Muscle metabolism during exercise. B. Pernow & B. Saltin, Eds. New York: Plenum Press. 51-61.

Hours SJ, Lebow MJ, Breyer FR. Effect of posture on strength of the knee flexor and extensor muscles. J Appl Physiol 1957;11:475.

Hungerford B, Gilleard W, Hodges P: Evidence of altered lumbopelvic muscle recruitment in the presence of sacroiliac joint pain. Spine, 2003, 28: 1593–1600.

Ingher RS. Iliopsoas myofascial dysfunction: a treatable cause of “failed” low back syndrome. Arch Phys Med Rehabil 1989;70:382-385.

Itoi E. Roentgenorgraphic analysis of posture in spinal osteoporosis’s. Spine 1991;16 (7): 750-756.

Keller RB. Non-operative treatments of adolescent idiopathic scoliosis. In: Barr JS, ed. The spine-instructional course lectures. Vol 30. 1989:129.

Kendall, F. P., McCreary, E. K., Provance, P. G., Rodgers, M. M., & Romani, W. A. (2005). Muscles: Testing and Function with Posture and Pain (Fifth, North American ed.).

Kendall HO, Kendall FP. Study and treatment of muscle imbalance in cases of low back and sciatic pain. Pamphlet. Baltimore: privately printed, 1936. 

Kendall HO, Kendall FP. Gluteus mediums and it’s relation to body mechanics. Physiother Rev 1941;21:131.

Kendall HO, Kendall FP. Posture, flexibility, and abdominal muscle tests (leaflet). Baltimore: Waverly Press, 1964.

Kendall HO, Kendall FP. Developing and maintaining good posture. J Am Phys Ther Assoc 1968;48:319.

Kendall Ho, Kendall FP, Boynton DA. Posture and pain. Baltimore: Williams & Wilkins, 19522. Reprinted Melbourne, Florida: Robert E Kreisler, 1971.

Kendall FP. Range of motion. The correlation of physiology with therapeutic exercise. New York: American Physical Therapy Association, 1956.

Kenney, W.L., Wilmore, J.H. & Costill, D.L. 2015. Physiology of sport and exercise. Rev. 6th ed. Champaign, US: Human Kinetics.

Klousen K, Rasmussen, B. On the location of the line of gravity in relation to L5 in standing. Acts Physiol Scand 1968; 72:45.

Kraus H. Effects of lordosis on the stress in the lumbar spine. Clin Orthop 1976;117:56.

Lilienfeld AM, Jacobs M, Willis M. A study of the reproducibility of muscle testing and certain other aspects of muscle scoring. Phys Ther Rev 1954;34 (6): 279-290.

Lister MJJ, ed. Biomechanics. 1984;64:12.

Lister MJJ, eD. Muscle Biology. 1982;62:12.

Loelb WY. Measurement of spinal posture and range of spinal movement. Ann Phys Med 1967;9:103.

Loptata M, Evanich MJ, Laurence RV. The electromyogram of the diaphragm in the investigation of human regulation of ventilation. Chest 1976;70(Suppl):162S.

Low JL. The reliability of joint measurement. Physiother 1976;62:227.

Marcus M, Gerr F, Monteilh C, et al. Postural risk factors for musculoskeletal symptoms and disorders. Am J Ind Med 2002; 41:236-249.

McMurray, R.G. & Hackney, A.C. 2000. Endocrine responses to exercise and training. In Exercise & sports science. W.E. Garrett & D.T. Kirkendall, Eds. Philadelphia: Lippincott Williams & Wilkins Publisher. 135-162.

Moller M. Ekstran J, Oberg B, Gillquist J. Duration of stretching effect on range of motion in Lowe extremities. Arch Phys Med rehabilitations 1985;66:171-173

Moore KL. Clinically oriented anatomy. Baltimore: Williams & Wilkins, 1980. 

Murray, B. & Rosenbloom, C. 2018. Fundamentals of glycogen metabolism for coaches and athletes. Nutrition Reviews. 76(4):243-259. DOI: 10.1093/nutrit/nuy001.

Patton NJ, Mortensen OA. A study of some mechanical factors affecting reciprocal activity in one-joint muscles. Anat Rec 1970:166:360

Physical Therapy, Journal of the American Physical Therapy Association.

Röckl, K.S.C., Witczak, C.A. & Goodyear, L.J. 2008. Signaling mechanisms in skeletal muscle: acute responses and chronic adaptations to exercise. Life. 60(3):145-153. DOI: 10.1002/iub.21.

Salminen JJ, Maki P. Oksanen A, Pentti J. Spinal mobility and trunk muscle strength in 15-year-old school children with and without back pain. Spine 199;17(4):405-411.

Salter N, Darcus HD. The effect of the degree of elbow flexion on the maximum torques developed in pronation and supination of the right hand. J Anat 1952;86-B:197.

Schuit D, Adrian M, Pidcoe P. Effect of heel lifts on ground reaction force patterns in subject with structural leg-length discrepancies. Phys There 1989;69 (8): 663-670

Shaffer T, Wolfson M, Bhutan VK. Respiratory muscle function, assessment, and training. Physical Ther 1981;61:12.

Sherwood, L. 2013. Introduction to human physiology. Rev. 8th ed. Pacific Grove, US: Brooks/Cole Publishing.

Smidt GL, Rogers MW. Factors contributing to the regulation and clinical assessment of muscular strength. Plus Ther 1982;62(9):1283-1289.

Smith A, O’Sullivan P, Straker L. Classification of sagittal thoraco-lumbo-pelvic alignment in standing and its relationship to low back pain. Spine (Phila Pa 1976). 2008 Sep 1;33(19):2101-7.

Smith JW. Muscular control of the arches of the foot in standing: an electromyographical assessment. J Anat 1954;88-B:152.

Soderberg GL, Dostal WF. Electromyographic study of 3 parts of the gluteus medium muscle during functional activities. Phys There 1978;58(6):691-696.

Speakman HGB, Weisburg J. The vastus medialis controversy. Physiother 1977;63:8.

Stokes IAF, Abery JM. Influence of the hamstring muscles on lumbar spine curvature in sitting. Spine 1980;5(6):525-528

Stone B, Beekman C, Hall V, Guess V, Brooks HL. The effect of an exercise program on change in curve in adolescents with minimal idiopathic scoliosis. Phys There 1979;59(6)759-763.

Suehiro T, Mizutani M, Okamoto M, et al. : Influence of hip joint position on muscle activity during prone hip extension with knee flexion. J Phys Ther Sci, 2014.

Sullivan MS. Back support mechanisms during manual lifting. Phys Ther 1989;69(1):38-45.

Suzuki N. An electromyographic study of the role of muscles in arch support of the normal and flat foot. Nagoya Med K 1972;17:57.

Tateuchi H, Taniguchi M, Mori N, et al. : Balance of hip and trunk muscle activity is associated with increased anterior pelvic tilt during prone hip extension. J Electromyogr Kinesiol, 2012, 22: 391–397.

The Orthopedic Clinics of North America, 31 Dec 1976, 8(1):85-96
PMID: 857228 

Thomas HO. Diseases of the hip, knee, and ankle joints. (Reproduction of 2nd ed, 1876.) Boston: Little, Brown, 1962.

True RC, Carpenter MG, eds. Strong and Elwyn’s human neuroanatomy. 6th ed. Baltimore: Williams & Wilkins. 1969. 

Vander AJ, Sherman JH, Luciano DS. Human physiology: the mechanism of body function. 3rd ed. New York: McGraw-Hill 1980.

Wan, J., Qin, Z., Wang, P., Sun, Y. & Liu, X. 2017. Muscle fatigue: general understanding and treatment. Experimental and Molecular Medicine. 49:1-11. DOI:

Warfel JH. The head, neck and trunk. 5th ed. Philadelphia: Lea & Febiger, 1985.

Weiss HR. The effect of an exercise program on vital capacity and rib mobility in patients with idiopathic scoliosis. Spine 1991;16:1.

Wells, KF. Kinesiology, 4th ed. Philadelphia: WB Saunders, 1966.

White A, Panjabi M. Clinical biomechanics of the spine. Philadelphia: JB Lippincott, 1978.

Wilke HJ, Wolf S, Claes LE, et al. : Stability increase of the lumbar spine with different muscle groups. A biomechanical in vitro study. Spine, 1995, 20: 192–198.

Williams  M, Lissner HR. Biomechanics of human motion. Philadelphia: WB Saunders, 1962.

Williams M, Stutzman L. Strength variation through the range of joint motion. Phys Ther Rev 1959;39:145.

Willams PC. The lumbosacral spine. New York: McGraw- Hill, 1965.

Wolf S. Normative data on low back mobility and activity levels. Am J Phys Med 1979;58:217.

World Health Organization. 2018. Physical activity. Available: [April 1, 2020].

Zouhal, H., Jacob, C., Delamarche, P. & Gratas-Delamarche, A. 2008. Catecholamines and the effects of exercise, training and gender. Sports Medicine. 38(5):401-423.

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