In:
Journal of Sport Rehabilitation, Human Kinetics, Vol. 9, No. 4 ( 2000-11), p. 269-278
Abstract:
Proprioceptive neuromuscular facilitation (PNF) is commonly used before competition to increase range of motion. It is not known how it changes muscle response to rapid length changes. Objective: To determine whether PNF alters hamstring muscle activity during response to rapid elongation. Design: 2 X 2 factorial. Setting: Laboratory. Participants: Twenty-four women; means: 167.27 cm, 58.92 kg, 21.42 y, 18.41% body fat, 21.06 kg/m 2 BMI. intervention: Measurements before and after either rest or PNF were compared. Main Outcome Measures: Average muscle activity immediately after a rapid and unexpected stretch, 3 times pretreatment and posttreatment, averaged into 2 pre-and post- measures. Results: PNF caused decreased activity in the biceps femoris during response to a sudden stretch ( P = .04). No differences were found in semitendinosus activity ( P = .35). Conclusions: Decreased muscle activity likely results from acute desensitization of the muscle spindle, which might increase risk of muscle and tendon injury.
Type of Medium:
Online Resource
ISSN:
1056-6716
,
1543-3072
Language:
Unknown
Publisher:
Human Kinetics
Publication Date:
2000
SSG:
31
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