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Elastography Study of Hamstring Behaviors during Passive Stretching.

Le Sant G, Ates F, Brasseur JL, Nordez A - PLoS ONE (2015)

Bottom Line: The results showed different values of shear modulus for the same amount of perceived stretch, with the highest measurements in the high-flexed hip situation.The inter-subject variability was 35.3% for ST, 27.4% for SM and 30.2% for BF-lh.In addition muscles have different passive behaviors, and future works will clarify if it can be linked with rate of injury.

View Article: PubMed Central - PubMed

Affiliation: Laboratory 'Movement, Interactions, Performance' (EA 4334), Faculty of Sports Sciences, University of Nantes, Nantes, France; School of Physiotherapy (IFM3R), Nantes, France.

ABSTRACT

Introduction: The mechanical properties of hamstring muscles are usually inferred from global passive torque/angle relationships, in combination with adjoining tissues crossing the joint investigated. Shear modulus measurement provides an estimate of changes in muscle-tendon stiffness and passive tension. This study aimed to assess the passive individual behavior of each hamstring muscle in different stretching positions using shear wave elastography.

Methods/results: The muscle shear modulus of each hamstring muscle was measured during a standardized slow passive knee extension (PKE, 80% of maximal range of motion) on eighteen healthy male volunteers. Firstly, we assessed the reliability of the measurements. Results were good for semitendinosus (ST, CV: 8.9%-13.4%), semimembranosus (SM, CV: 10.3%-11.2%) and biceps femoris long-head (BF-lh, CV: 8.6%-13.3%), but not for biceps femoris short-head (BF-sh, CV: 20.3%-44.9%). Secondly, we investigated each reliable muscle in three stretch positions: 70°, 90° and 110° of hip flexion. The results showed different values of shear modulus for the same amount of perceived stretch, with the highest measurements in the high-flexed hip situation. Moreover, individual muscles displayed different values, with values increasing or BF-lh, SM and ST, respectively. The inter-subject variability was 35.3% for ST, 27.4% for SM and 30.2% for BF-lh.

Conclusion: This study showed that the hip needs to be high-flexed to efficiently tension the hamstrings, and reports a higher muscle-tendon stress tolerance at 110° of hip angle. In addition muscles have different passive behaviors, and future works will clarify if it can be linked with rate of injury.

No MeSH data available.


Related in: MedlinePlus

Shear modulus-lengthening relationships obtained for each hamstring muscle from the study participants.The variability was quantified using the ratio SD/mean (in %), expressed at the maximal common knee angle in HF-110 for (A) semitendinosus (ST), (B) semimembranosus (SM), (C) biceps-femoris long head (BF-lh).
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pone.0139272.g004: Shear modulus-lengthening relationships obtained for each hamstring muscle from the study participants.The variability was quantified using the ratio SD/mean (in %), expressed at the maximal common knee angle in HF-110 for (A) semitendinosus (ST), (B) semimembranosus (SM), (C) biceps-femoris long head (BF-lh).

Mentions: The inter-individual variability of shear modulus is shown on Fig 4. The modulus variation of values between participants was 35.3% for ST, 27.4% for SM and 30.2% for BF-lh at the maximal common knee angle (58°).


Elastography Study of Hamstring Behaviors during Passive Stretching.

Le Sant G, Ates F, Brasseur JL, Nordez A - PLoS ONE (2015)

Shear modulus-lengthening relationships obtained for each hamstring muscle from the study participants.The variability was quantified using the ratio SD/mean (in %), expressed at the maximal common knee angle in HF-110 for (A) semitendinosus (ST), (B) semimembranosus (SM), (C) biceps-femoris long head (BF-lh).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4587804&req=5

pone.0139272.g004: Shear modulus-lengthening relationships obtained for each hamstring muscle from the study participants.The variability was quantified using the ratio SD/mean (in %), expressed at the maximal common knee angle in HF-110 for (A) semitendinosus (ST), (B) semimembranosus (SM), (C) biceps-femoris long head (BF-lh).
Mentions: The inter-individual variability of shear modulus is shown on Fig 4. The modulus variation of values between participants was 35.3% for ST, 27.4% for SM and 30.2% for BF-lh at the maximal common knee angle (58°).

Bottom Line: The results showed different values of shear modulus for the same amount of perceived stretch, with the highest measurements in the high-flexed hip situation.The inter-subject variability was 35.3% for ST, 27.4% for SM and 30.2% for BF-lh.In addition muscles have different passive behaviors, and future works will clarify if it can be linked with rate of injury.

View Article: PubMed Central - PubMed

Affiliation: Laboratory 'Movement, Interactions, Performance' (EA 4334), Faculty of Sports Sciences, University of Nantes, Nantes, France; School of Physiotherapy (IFM3R), Nantes, France.

ABSTRACT

Introduction: The mechanical properties of hamstring muscles are usually inferred from global passive torque/angle relationships, in combination with adjoining tissues crossing the joint investigated. Shear modulus measurement provides an estimate of changes in muscle-tendon stiffness and passive tension. This study aimed to assess the passive individual behavior of each hamstring muscle in different stretching positions using shear wave elastography.

Methods/results: The muscle shear modulus of each hamstring muscle was measured during a standardized slow passive knee extension (PKE, 80% of maximal range of motion) on eighteen healthy male volunteers. Firstly, we assessed the reliability of the measurements. Results were good for semitendinosus (ST, CV: 8.9%-13.4%), semimembranosus (SM, CV: 10.3%-11.2%) and biceps femoris long-head (BF-lh, CV: 8.6%-13.3%), but not for biceps femoris short-head (BF-sh, CV: 20.3%-44.9%). Secondly, we investigated each reliable muscle in three stretch positions: 70°, 90° and 110° of hip flexion. The results showed different values of shear modulus for the same amount of perceived stretch, with the highest measurements in the high-flexed hip situation. Moreover, individual muscles displayed different values, with values increasing or BF-lh, SM and ST, respectively. The inter-subject variability was 35.3% for ST, 27.4% for SM and 30.2% for BF-lh.

Conclusion: This study showed that the hip needs to be high-flexed to efficiently tension the hamstrings, and reports a higher muscle-tendon stress tolerance at 110° of hip angle. In addition muscles have different passive behaviors, and future works will clarify if it can be linked with rate of injury.

No MeSH data available.


Related in: MedlinePlus