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An investigation into Muscle Energy Technique and its effect on hamstring length over time and comparison of the same between female and male subjects

Matthew Lee                                                                     Supervisor: Dawn Limbert

Abstract  

Aim of study

To further inform osteopaths in clinical use of muscle energy technique. Exploration of the mechanism behind observed changes at different time intervals and genders may help support current theories of muscle energy technique neurophysiology.

 

Methods

Thirty-one asymptomatic subjects of mixed gender took part, following operator instructions as per a pre experimental briefing. Physical measurement data were gathered using goniometry at the hip joint before and, at specified time points after, directed muscle energy technique intervention to the hamstrings muscles. Changes in resting length of the hamstrings muscles post intervention were recorded and analysed.  

 

Findings

Changes in muscle length remain measureable and extremely significant (P<0.0001) up to 3 hours after intervention.  There is no significant difference in muscle length 7 hours (P=0.0897) post intervention. There is no significant difference in stretch response between male and female subjects immediately following (P=0.8127), at 1 hour (P=0.2333), 3 hours (P=0.0662) and 7 hours (P=0.4961) after intervention.

 

CONCLUSION

Following a single intervention of PIR MET, an extremely significant stretch of the hamstring was produced which lasted 3 hours. Gender has no significant effect on stretch response at any time point following single MET intervention. This data helps support the current ‘stretch tolerance’ theory of MET neurophysiology which is purported to be independent of the viscoelastic properties of muscle.