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Sensory adaptation after a 2-week stretching regimen of the rectus femoris muscle
Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.ORCID iD: 0000-0001-7543-4397
Umeå University, Faculty of Medicine, Department of Surgical and Perioperative Sciences, Sports Medicine.
2001 (English)In: Archives of Physical Medicine and Rehabilitation, ISSN 0003-9993, E-ISSN 1532-821X, Vol. 82, no 9, 1245-1250 p.Article in journal (Refereed) Published
Abstract [en]

OBJECTIVE: To study the effects of a muscle stretching regimen for the rectus femoris muscle on subjective stretch sensation and range of motion (ROM). DESIGN: A 2 x 2 crossover design comprising 2 treatments and 2 intervention periods. SETTING: A military base in Sweden. PARTICIPANTS: A volunteer sample of 29 male military conscripts divided into 2 groups, with each group subjected to both experimental and control treatments at different time periods. INTERVENTION: Two weeks of supervised stretching (4 times/wk) of the rectus femoris muscle (experimental treatment) and the calf muscles (control treatment). MAIN OUTCOME MEASURES: Subjective rating of the stretch sensation for the anterior aspect of the thigh determined on a category ratio scale. Passive knee flexion ROM determined on each test with the same applied torque, specific for each subject. RESULTS: An additive analysis of variance revealed that the stretch sensation after the experimental treatment was decreased, compared with the control treatment (p <.01). The knee flexion, however, remained the same regardless of the treatment. CONCLUSION: Sensory adaptation seems to be an important mechanistic factor in the effect stretching has on ROM changes. The lack of change in knee flexion suggests that the stretching, as performed in this study, did not influence stiffness of the rectus femoris muscle. Sensory adaptation may also be an underlying mechanism in the alleviating effect of stretching when applied to tired, tender, and painful muscles.

Place, publisher, year, edition, pages
2001. Vol. 82, no 9, 1245-1250 p.
Keyword [en]
knee, muscles, range of motion, articular, rehabilitation
National Category
Physiology
Identifiers
URN: urn:nbn:se:umu:diva-3788DOI: 10.1053/apmr.2001.24224ISI: 000170873900016PubMedID: 11552198OAI: oai:DiVA.org:umu-3788DiVA: diva2:142660
Available from: 2004-03-12 Created: 2004-03-12 Last updated: 2016-02-26Bibliographically approved
In thesis
1. Effects of repetitive work on proprioception and of stretching on sensory mechanisms: implications for work-related neuromuscular disorders
Open this publication in new window or tab >>Effects of repetitive work on proprioception and of stretching on sensory mechanisms: implications for work-related neuromuscular disorders
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aims of the thesis were (i) to investigate the impact of repetitive low-intensity work exposure on proprioception and (ii) to examine effects of muscle stretching (especially sensory effects and effects on muscle nociception) and to relate its application to the prevention, alleviation and/or treatment of work-related neuromuscular disorders.

The effects of low-intensity repetitive work on the shoulder proprioception were tested in healthy subjects. The effect of working time on the retention of subjective fatigue and their relation to changes in proprioception, and the immediate effect of stretching on shoulder proprioception were investigated. A new method to test the stretchability of the rectus femoris muscle was investigated for reliability and validity and used to assess the effects of a two-week stretching regimen on range of motion and on subjective stretch sensation. Finally, the interactions between innocuous muscle stretch and nociceptive chemical stimulation on discharge behavior of nociceptive dorsal horn neurons in the feline spinal cord were explored.

The main findings were as follows: 1) The repetitive low-intensity work to fatigue diminished the shoulder proprioception; the working time as well as the retention of subjective fatigue were partly related to the extent of changed proprioception. 2) There was no effect of acute muscle stretching on the proprioception. 3) The new method for testing muscle stretchability proved valid and reliable. A two-week stretching regimen increased the tolerance to stretch torque, but the range of motion remained unchanged. 4) Half of the nociceptive dorsal horn neurons that responded to close arterial injections of bradykinin were modulated by muscle stretching applied directly after the injections.

Altogether, the results give credence to the hypothesis of an involvement of sensory information distortion due to repetitive low-intensity work exposure in the development of work-related neuromuscular disorders. Increased tolerance to stretch torque may be an important mechanism in explaining improvements following stretch treatment. The spinal interactions between innocuous stretch and nociceptive muscle afferent inputs indicate a possible mechanism involved in stretching-induced pain alleviation.

Place, publisher, year, edition, pages
Umeå: Kirurgisk och perioperativ vetenskap, 2004. 87 p.
Series
Umeå University medical dissertations, ISSN 0346-6612 ; 877
Keyword
Medicine, Repetitive motions, Muscle fatigue, Proprioception, Muscle stretching, Work-related musculoskeletal disorders, Nociception, Ergonomics, Medicin
National Category
Dermatology and Venereal Diseases
Research subject
Medicine
Identifiers
urn:nbn:se:umu:diva-211 (URN)91-7305-604-9 (ISBN)
Public defence
2004-03-19, Stora föreläsningssalen, Arbetslivsinstitutet, Umeå, 10:00 (English)
Opponent
Supervisors
Available from: 2004-03-12 Created: 2004-03-12 Last updated: 2015-01-20Bibliographically approved

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