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Musculotendinous stiffness of triceps surae, maximal rate of force development, and vertical jump performance.

Driss T, Lambertz D, Rouis M, Jaafar H, Vandewalle H - Biomed Res Int (2015)

Bottom Line: The subjects were subdivided in 3 groups in function of CMJ (groups H, M, and L for high, medium, and low performers, resp.).There was a downward curvature of the torque-stiffness relationship at high torques in group H or M and the torque-stiffness regression was linear in group L only.These results suggested that torque-stiffness relationships with a plateau at high torques are more frequent in the best jumpers.

View Article: PubMed Central - PubMed

Affiliation: CeRSM (EA 2931), Equipe de Physiologie, Biomécanique et Imagerie du Mouvement, UFR STAPS, Université Paris Ouest Nanterre La Défense, 200 avenue de la République, 92000 Nanterre, France.

ABSTRACT
The relationships between ankle plantar flexor musculotendinous stiffness (MTS) and performance in a countermovement vertical jump (CMJ) and maximal rate of torque development (MRTD) were studied in 27 active men. MTS was studied by means of quick releases at 20 (S0.2), 40 (S0.4), 60 (S0.6), and 80% (S0.8) of maximal voluntary torque (T(MVC)). CMJ was not correlated with strength indices but was positively correlated with MRTD/BM, S 0.4/BM. The slope α 2 and intercept β 2 of the torque-stiffness relationships from 40 to 80% T(MVC) were correlated negatively (α 2) and positively (β 2) with CMJ. The different stiffness indices were not correlated with MRTD. The prediction of CMJ was improved by the introduction of MRTD in multiple regressions between CMJ and stiffness. CMJ was also negatively correlated with indices of curvature of the torque-stiffness relationship. The subjects were subdivided in 3 groups in function of CMJ (groups H, M, and L for high, medium, and low performers, resp.). There was a downward curvature of the torque-stiffness relationship at high torques in group H or M and the torque-stiffness regression was linear in group L only. These results suggested that torque-stiffness relationships with a plateau at high torques are more frequent in the best jumpers.

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Relationships between torque (abscissa) in fraction of the torque produced during a maximal voluntary contraction (TMVC) and stiffness normalized to TMVC. In (a), all the subjects (n = 27). In (b), comparison of groups H (black dots), M (grey dots), and L (empty circles). In (c), the results of the best performer in countermovement jump (BJ) are compared with those of the worst performer (WJ).
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fig3: Relationships between torque (abscissa) in fraction of the torque produced during a maximal voluntary contraction (TMVC) and stiffness normalized to TMVC. In (a), all the subjects (n = 27). In (b), comparison of groups H (black dots), M (grey dots), and L (empty circles). In (c), the results of the best performer in countermovement jump (BJ) are compared with those of the worst performer (WJ).

Mentions: The T-S relationships are presented in Figure 3(a) for the whole group (n = 27) and in Figure 3(b) for groups H, M, and L. The different indices of stiffness are given in Table 2. The differences between group M and the other groups were significant for S0.4/TMVC (Table 2 and Figure 3(b)). For S0.4/BM, it was the differences between group H and the other groups that were significant (Table 2).


Musculotendinous stiffness of triceps surae, maximal rate of force development, and vertical jump performance.

Driss T, Lambertz D, Rouis M, Jaafar H, Vandewalle H - Biomed Res Int (2015)

Relationships between torque (abscissa) in fraction of the torque produced during a maximal voluntary contraction (TMVC) and stiffness normalized to TMVC. In (a), all the subjects (n = 27). In (b), comparison of groups H (black dots), M (grey dots), and L (empty circles). In (c), the results of the best performer in countermovement jump (BJ) are compared with those of the worst performer (WJ).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4325552&req=5

fig3: Relationships between torque (abscissa) in fraction of the torque produced during a maximal voluntary contraction (TMVC) and stiffness normalized to TMVC. In (a), all the subjects (n = 27). In (b), comparison of groups H (black dots), M (grey dots), and L (empty circles). In (c), the results of the best performer in countermovement jump (BJ) are compared with those of the worst performer (WJ).
Mentions: The T-S relationships are presented in Figure 3(a) for the whole group (n = 27) and in Figure 3(b) for groups H, M, and L. The different indices of stiffness are given in Table 2. The differences between group M and the other groups were significant for S0.4/TMVC (Table 2 and Figure 3(b)). For S0.4/BM, it was the differences between group H and the other groups that were significant (Table 2).

Bottom Line: The subjects were subdivided in 3 groups in function of CMJ (groups H, M, and L for high, medium, and low performers, resp.).There was a downward curvature of the torque-stiffness relationship at high torques in group H or M and the torque-stiffness regression was linear in group L only.These results suggested that torque-stiffness relationships with a plateau at high torques are more frequent in the best jumpers.

View Article: PubMed Central - PubMed

Affiliation: CeRSM (EA 2931), Equipe de Physiologie, Biomécanique et Imagerie du Mouvement, UFR STAPS, Université Paris Ouest Nanterre La Défense, 200 avenue de la République, 92000 Nanterre, France.

ABSTRACT
The relationships between ankle plantar flexor musculotendinous stiffness (MTS) and performance in a countermovement vertical jump (CMJ) and maximal rate of torque development (MRTD) were studied in 27 active men. MTS was studied by means of quick releases at 20 (S0.2), 40 (S0.4), 60 (S0.6), and 80% (S0.8) of maximal voluntary torque (T(MVC)). CMJ was not correlated with strength indices but was positively correlated with MRTD/BM, S 0.4/BM. The slope α 2 and intercept β 2 of the torque-stiffness relationships from 40 to 80% T(MVC) were correlated negatively (α 2) and positively (β 2) with CMJ. The different stiffness indices were not correlated with MRTD. The prediction of CMJ was improved by the introduction of MRTD in multiple regressions between CMJ and stiffness. CMJ was also negatively correlated with indices of curvature of the torque-stiffness relationship. The subjects were subdivided in 3 groups in function of CMJ (groups H, M, and L for high, medium, and low performers, resp.). There was a downward curvature of the torque-stiffness relationship at high torques in group H or M and the torque-stiffness regression was linear in group L only. These results suggested that torque-stiffness relationships with a plateau at high torques are more frequent in the best jumpers.

Show MeSH
Related in: MedlinePlus