Document Detail

Effects of quadriceps and hamstrings proprioceptive neuromuscular facilitation stretching on knee movement sensation.
MedLine Citation:
PMID:  20300021     Owner:  NLM     Status:  MEDLINE    
Stretching before competition has traditionally been thought to benefit performance; however, recent evidence demonstrating reduced muscle force and power immediately after stretching suggests otherwise. We hypothesized that knee joint position sense would be diminished immediately after proprioceptive neuromuscular facilitation (PNF) stretching to the hamstrings and quadriceps. Eighteen subjects (aged 18-30 years) were seated with their dominant foot attached to a motorized arm with the knee flexed at 135 degrees . To block external cues, the subjects wore a blindfold, earplugs, and headphones providing white noise. The knee was displaced in either the flexion or the extension direction at a velocity of 0.4 degrees .s, and subjects pressed a button when they sensed motion. The knee was returned to 135 degrees , and the test was repeated for a total of 10 trials. The PNF group received PNF stretching to the hamstrings and quadriceps of the dominant leg. The SHAM group had the dominant leg passively moved within each subject's functional range of motion. The ability to detect knee movement was retested in the PNF and SHAM groups. Pre- and posttest latencies between movement onset and subject response were analyzed. Results indicated that the PNF group had significantly increased latencies after stretching (from 2.56 +/- 0.83 to 3.46 +/- 1.90 seconds) compared with the SHAM group (3.93 +/- 2.40 to 3.72 +/- 2.15 seconds). It is concluded that PNF stretching of the hamstrings and quadriceps may acutely diminish sensitivity to knee movement. For coaches and trainers, these findings are consistent with previous reports of loss in muscle force and power immediately after stretching, suggesting that stretching just before competition may diminish performance.
Jefferson W Streepey; Marla J Mock; Jody L Riskowski; William R Vanwye; Boris M Vitvitskiy; Alan E Mikesky
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  24     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-08     Completed Date:  2010-07-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1037-42     Citation Subset:  IM    
Human Performance Laboratory, Department of Physical Education, Indiana University Purdue University Indianapolis, Indiana, USA.
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MeSH Terms
Analysis of Variance
Cohort Studies
Kinesthesis / physiology*
Knee Joint / physiology*
Muscle Contraction / physiology
Muscle Relaxation / physiology
Muscle Stretching Exercises / methods*
Quadriceps Muscle / physiology
Range of Motion, Articular / physiology*
Reference Values
Task Performance and Analysis
Thigh / physiology
Time Factors
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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