Lack of neuromuscular origins of adaptation after a long-term stretching program

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Publication Type pre-print
School or College College of Health
Department Exercise & Sports Science
Creator Hayes, Bradley T.
Other Author Harter, Rod A.; Widrick, Jeffrey J.; Williams, Daniel P.; Hoffman, Mark A.; Hicks-Little, Charlie A.
Title Lack of neuromuscular origins of adaptation after a long-term stretching program
Date 2012-01-01
Description Context: Static stretching is commonly used during the treatment and rehabilitation of orthopedic injuries to increase joint range of motion (ROM) and muscle flexibility. Understanding the physiological adaptations that occur in the neuromuscular system as a result of long-term stretching may provide insight into the mechanisms responsible for changes in flexibility. Objective: To examine possible neurological origins and adaptations in the Ia-reflex pathway that allow for increases in flexibility in ankle ROM, by evaluating the reduction in the synaptic transmission of Ia afferents to the motoneuron pool. Design: Repeated-measures, case-controlled study. Setting: Sports medicine research laboratory. Participants: 40 healthy volunteers with no history of cognitive impairment, neurological impairment, or lower extremity surgery or injury within the previous 12 mo. Intervention: Presynaptic and postsynaptic mechanisms were evaluated with a chronic stretching protocol. Twenty subjects stretched 5 times a wk for 6 wk. All subjects were measured at baseline, 3 wk, and 6 wk. Main Outcome Measures: Ankle-dorsiflexion ROM, Hmax:Mmax, presynaptic inhibition, and disynaptic reciprocal inhibition. Results: Only ROM had a significant interaction between group and time, whereas the other dependent variables did not show significant differences. The experimental group had significantly improved ROM from baseline to 3 wk (mean 6.2 ± 0.9, P < .001), 3 wk to 6 wk (mean 5.0 ± 0.8, P < .001), and baseline to 6 wk (mean 11.2 ±0.9, P < .001). Conclusions: Ankle dorsiflexion increased by 42.25% after 6 wk of static stretching, but no significant neurological changes resulted at any point of the study, contrasting current literature. Significant neuromuscular origins of adaptation do not exist in the Ia-reflex-pathway components after a long-term stretching program as currently understood. Thus, any increases in flexibility are the result of other factors, potentially mechanical changes or stretch tolerance.
Type Text
Publisher Human Kinetics Publishers, Inc.
Volume 21
Issue 2
First Page 99
Last Page 106
Dissertation Institution University of Utah
Language eng
Bibliographic Citation Hayes, B.T., Harter, R. A., Widrick, J. J., Williams, D. P., Hoffman, M. A., & Hicks-Little, C. A. (2012). Lack of neuromuscular origins of adaptation after a long-term stretching program. Journal of Sport Rehabilitation, 21(2), 99-106.
Rights Management (c) Human Kinetics Publishers, Inc.
Format Medium application/pdf
Format Extent 513,502 bytes
Identifier uspace,17764
ARK ark:/87278/s61551s5
Setname ir_uspace
Date Created 2012-09-20
Date Modified 2021-05-06
ID 708120
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