Journal
SCANDINAVIAN JOURNAL OF MEDICINE & SCIENCE IN SPORTS
Volume 25, Issue 3, Pages 346-355Publisher
WILEY
DOI: 10.1111/sms.12228
Keywords
Stiffness; ultrasound; proprioceptive neuromuscular facilitation; passive resistive torque; MVC; range of motion
Categories
Funding
- Austrian Science Fund FWF [P23786-B19]
- Austrian Science Fund (FWF) [P23786] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 23786] Funding Source: researchfish
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The purpose of this study was to investigate the influence of a 6-week proprioceptive neuromuscular facilitation (PNF) stretching training program on the various parameters of the human gastrocnemius medialis muscle and the Achilles tendon. Therefore, 49 volunteers were randomly assigned into PNF stretching and control groups. Before and after the stretching intervention, we determined the maximum dorsiflexion range of motion (RoM) with the corresponding fascicle length and pennation angle. Passive resistive torque (PRT) and maximum voluntary contraction (MVC) of the musculo-articular complex were measured with a dynamometer. Muscle-tendon junction (MTJ) displacement allowed us to determine the length changes in tendon and muscle, and hence to calculate stiffness. Mean RoM increased from 31.1 +/- 7.2 degrees to 33.1 +/- 7.2 degrees (P=0.02), stiffness of the tendon decreased significantly in both active (from 21.1 +/- 8.0 to 18.1 +/- 5.5N/mm) and passive (from 12.1 +/- 4.9 to 9.6 +/- 3.2N/mm) conditions, and the pennation angle increased from 18.5 +/- 1.8 degrees to 19.5 +/- 2.1 degrees (P=0.01) at the neutral ankle position (90 degrees), only in the intervention group, whereas MVC and PRT values remained unchanged. We conclude that a 6-week PNF stretching training program increases RoM and decreases tendon stiffness, despite no change in PRT.
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