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PHYS THER
Vol. 87, No. 12, December 2007, p. 1667
DOI: 10.2522/ptj.20060378.ic
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Research Reports

Invited Commentary

David E Krebs

DE Krebs, PT, DPT, PhD, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 (USA)

Address all correspondence to Dr Krebs at: dkrebs{at}mit.edu


Etnyre and Thomas1 correctly point out that gait is well studied, but the sit-to-stand (STS) movement is not. According to studies by Riley and colleagues2 and others, the STS movement has many modes. Some people stand "straight up," and others flex, bend, and twist.3,4 Just watch the next time you are in a train station, or a church, or wherever many people sit then stand: the variations are astounding. My colleagues and I5,6 and Burdett and colleagues7 tried to define these modes, observing from the benches of Massachusetts General Hospital's waiting room to the benches of Boston Public Garden (Dr Maureen Thornby helped with this), and—like Etnyre and Thomas—were equally quasi-successful. Thus, we concluded that much more study of the STS movement is needed. My friend, Dr Margaret Schenkman, will surely remember the many long hours we spent in the Biomotion Lab at Massachusetts General Hospital discussing what the real endpoints, commonalities, and demarcating events have in common between gait and the STS movement; we could not agree. And rightly so, despite the best 6-degree-of-freedom kinematics and all the forces we could muster. I encourage others to ponder these lines, but even having thousands of patients at our availability, we could not discern—even with brilliant Massachusetts Institute of Technology engineers such as Pat Riley and Ray Burdett and therapists such as Beth Ikeda and Rebecca Craik—a pattern that fits all. Please inform us! Keep up the good work, Dr Etnyre and Dr Thomas!


   References
 

  1. Etnyre B, Thomas DQ. Event standardization of sit-to-stand movements. Phys Ther. 2007;87:1651–1666.[Abstract/Free Full Text]
  2. Riley PO, Krebs DE, Popat RA. Biomechanical analysis of failed sit to stand. IEEE Trans Rehab Eng. 1997;5:353–359.[CrossRef][Medline]
  3. Kaya BK, Krebs DE, Riley PO. Dynamic stability in elders: momentum control in locomotor ADL. J Gerontol A Biol Sci Med Sci. 1998;53:M126–M134.[Abstract]
  4. Pai YC, Rogers MW. Segmental contributions to total body momentum in sit-to-stand. Med Sci Sports Exerc. 1991;23:225–230.
  5. Patten C, Krebs DE, Horak FB. Head and body center of gravity control strategies: adaptations following vestibular rehabilitation. Acta Otolaryngol. 2003;123:32–40.[Medline]
  6. McGibbon CA, Krebs DE. Age-related changes in lower trunk coordination and energy transfer during gait. J Neurophysiol. 2001;85:1923–1931.[Abstract/Free Full Text]
  7. Burdett RG, Habasevich R, Pisciotta J, Simon S. Biomechanical comparison of rising from two types of chairs. Phys Ther. 1985;65:1177–1183.[Abstract/Free Full Text]

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This Article
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Citing Articles
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Google Scholar
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Right arrow Search for Related Content
PubMed
Right arrow Articles by Krebs, D. E
Related Collections
Right arrow Gait Disorders
Right arrow Tests and Measurements
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