scholarly journals Relationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance

2021 ◽  
Vol 12 ◽  
Author(s):  
Ryosuke Ando ◽  
Shinya Sato ◽  
Naoya Hirata ◽  
Hiroki Tanimoto ◽  
Naoto Imaizumi ◽  
...  
Keyword(s):  
Training Group ◽  
Muscle Stiffness ◽  
Medial Gastrocnemius ◽  
Drop Jump ◽  
Jump Training ◽  
Explosive Performance ◽  
Before And After ◽  
Passive Muscle ◽  
And Training ◽  
Passive Muscle Stiffness

Passive muscle stiffness is positively associated with explosive performance. Drop jump training may be a strategy to increase passive muscle stiffness in the lower limb muscles. Therefore, the purpose of this study was to examine the effect of 8-week drop jump training on the passive stiffness in the plantar flexor muscles and the association between training-induced changes in passive muscle stiffness and explosive performance. This study was a randomized controlled trial. Twenty-four healthy young men were divided into two groups, control and training. The participants in the training group performed drop jumps (five sets of 20 repetitions each) 3days per week for 8weeks. As an index of passive muscle stiffness, the shear moduli of the medial gastrocnemius and soleus were measured by shear wave elastography before and after the intervention. The participants performed maximal voluntary isometric plantar flexion at an ankle joint angle of 0° and maximal drop jumps from a 15cm high box. The rate of torque development during isometric contraction was calculated. The shear modulus of the medial gastrocnemius decreased for the training group (before: 13.5±2.1kPa, after: 10.6±2.1kPa); however, such a reduction was not observed in the control group. There was no significant group (control and training groups)×time (before and after the intervention) interaction for the shear modulus of the soleus. The drop jump performance for the training group improved, while the rate of torque development did not change. Relative changes in these measurements were not correlated with each other in the training group. These results suggest that drop jump training decreases the passive stiffness in the medial gastrocnemius, and training-induced improvement in explosive performance cannot be attributed to change in passive muscle stiffness.

scholarly journals Changes in Titin Isoform Expression in Pacing-Induced Cardiac Failure Give Rise to Increased Passive Muscle Stiffness

Circulation ◽  
2002 ◽  
Vol 106 (11) ◽  
pp. 1384-1389 ◽  
Author(s):  
Yiming Wu ◽  
Stephen P. Bell ◽  
Karoly Trombitas ◽  
Christian C. Witt ◽  
Siegfried Labeit ◽  
...  
Keyword(s):  
Cardiac Failure ◽  
Muscle Stiffness ◽  
Isoform Expression ◽  
Passive Muscle ◽  
Passive Muscle Stiffness

Effect of Rest Duration Between Static Stretching on Passive Stiffness of Medial Gastrocnemius Muscle In Vivo

2020 ◽  
Vol 29 (5) ◽  
pp. 578-582
Author(s):  
Masatoshi Nakamura ◽  
Shigeru Sato ◽  
Ryosuke Kiyono ◽  
Nobushige Takahashi ◽  
Tomoichi Yoshida
Keyword(s):  
Elastic Modulus ◽  
Shear Wave ◽  
Repeated Measures ◽  
Shear Wave Elastography ◽  
Muscle Stiffness ◽  
Medial Gastrocnemius ◽  
Static Stretching ◽  
Shear Elastic Modulus ◽  
Before And After

Context: In clinical and sports settings, static stretching (SS) is usually performed to increase range of motion (ROM) and decrease passive muscle stiffness. Recently, the shear elastic modulus was measured by ultrasonic shear wave elastography as an index of muscle stiffness. Previous studies reported that the shear elastic modulus measured by ultrasound shear wave elastography decreased after SS, and the effects of SS on shear elastic modulus were likely affected by rest duration between sets of SS. Objective: To investigate the acute effects of SS with different rest durations on ROM and shear elastic modulus of gastrocnemius and to clarify whether the rest duration between sets of SS decreases the shear elastic modulus. Design: A randomized, repeated-measures experimental design. Setting: University laboratory. Participants: Sixteen healthy males volunteered to participate in the study (age 21.3 [0.8] y; height 171.8 [5.1] cm; weight 63.1 [4.5] kg). Main Outcome Measures: Each participant underwent 3 different rest interval durations during SS (ie, long rest duration: 90 s; normal rest duration: 30 s; and short rest duration: 10 s). This SS technique was repeated 10 times, thus lasting a total of 300 seconds with different rest durations in each protocol. The dorsiflexion ROM and shear elastic modulus were measured before and after SS. Results: Our results revealed that dorsiflexion ROM and shear elastic modulus were changed after 300-second SS; however, no effects of the rest duration between sets of SS were observed. Conclusions: In terms of decreasing the shear elastic modulus, clinicians and coaches should not focus on the rest duration when SS intervention is performed.

scholarly journals Effects of Supplementary Strength–Power Training on Neuromuscular Performance in Young Female Athletes

Sports ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 104
Author(s):  
Konstantina Karagianni ◽  
Olyvia Donti ◽  
Christos Katsikas ◽  
Gregory C. Bogdanis
Keyword(s):  
Female Athletes ◽  
Training Group ◽  
Young Female ◽  
Control Group ◽  
Drop Jump ◽  
Power Training ◽  
Jump Performance ◽  
Neuromuscular Performance ◽  
Specific Performance ◽  
Before And After

This study examined the effects of a short-duration supplementary strength–power training program on neuromuscular performance and sport-specific skills in adolescent athletes. Twenty-three female “Gymnastics for All” athletes, aged 13 ± 2 years, were divided into a training group (TG, n = 12) and a control group (CG, n = 11). Both groups underwent a test battery before and after 10 weeks of intervention. TG completed, in addition to gymnastics training, a supplementary 7–9 min program that included two rounds of strength and power exercises for arms, torso, and legs, executed in a circuit fashion with 1 min rest between rounds, three times per week. Initially, six exercises were performed (15 s work–15 s rest), while the number of exercises was decreased to four and the duration of each exercise was increased to 30 s (30 s rest) after the fifth week. TG improved countermovement jump performance with one leg (11.5% ± 10.4%, p = 0.002) and two legs (8.2% ± 8.8%, p = 0.004), drop jump performance (14.4% ± 12.6%, p = 0.038), single-leg jumping agility (13.6% ± 5.2%, p = 0.001), and sport-specific performance (8.8% ± 7.4%, p = 0.004), but not 10 m sprint performance (2.4% ± 6.6%, p = 0.709). No change was observed in the CG (p = 0.41 to 0.97). The results of this study indicated that this supplementary strength–power program performed for 7–9 min improves neuromuscular and sport-specific performance after 10 weeks of training.

scholarly journals Velocity dependent passive muscle stiffness

2003 ◽  
Vol 74 (2) ◽  
pp. 283-283 ◽  
Author(s):  
J W Dunne ◽  
B J Singer ◽  
G T Allison
Keyword(s):  
Muscle Stiffness ◽  
Passive Muscle ◽  
Passive Muscle Stiffness

Shear Wave Elastography for Noninvasive Quantification of Passive Muscle Stiffness in Typically Developing Children

PM&R ◽  
2013 ◽  
Vol 5 ◽  
pp. S199-S199 ◽  
Author(s):  
Joline E. Brandenburg ◽  
Sarah Eby ◽  
Bradford W. Landry ◽  
Ann M. Hoffman ◽  
Shigao Chen ◽  
...  
Keyword(s):  
Shear Wave ◽  
Shear Wave Elastography ◽  
Muscle Stiffness ◽  
Typically Developing ◽  
Typically Developing Children ◽  
Passive Muscle ◽  
Passive Muscle Stiffness

scholarly journals COL5A1 rs12722 polymorphism is not associated with passive muscle stiffness and sports-related muscle injury in Japanese athletes

2019 ◽  
Author(s):  
Eri Miyamoto-Mikami ◽  
Naokazu Miyamoto ◽  
Hiroshi Kumagai ◽  
Kosuke Hirata ◽  
Naoki Kikuchi ◽  
...  
Keyword(s):  
Risk Factor ◽  
Muscle Injury ◽  
Muscle Stiffness ◽  
Joint Flexibility ◽  
Genotype Frequencies ◽  
Significant Difference ◽  
Type V ◽  
Straight Leg Raise ◽  
Passive Muscle ◽  
Passive Muscle Stiffness

Abstract Background: Poor joint flexibility has been repeatedly proposed as a risk factor for muscle injury. The C-to-T polymorphism (rs12722) in the 3′-untranslated region of the collagen type V α1 chain gene ( COL5A1 ) is reportedly associated with joint flexibility. Flexibility of a normal joint is largely determined by passive muscle stiffness, which is influenced by intramuscular collagenous connective tissues including type V collagen. The present study aimed to test the hypothesis that the COL5A1 rs12722 polymorphism influences joint flexibility via passive muscle stiffness, and is accordingly associated with the incidence of muscle injury. Methods: In Study 1, we examined whether the rs12722 polymorphism is associated with joint flexibility and passive muscle stiffness in 363 healthy young adults. Joint flexibility was evaluated by passive straight-leg-raise and sit-and-reach tests, and passive muscle stiffness was measured using ultrasound shear wave elastography. In Study 2, the association of the rs12722 polymorphism with sports-related muscle injury was assessed in 1559 Japanese athletes. Muscle injury history and severity were assessed by a questionnaire. In both Study 1 and Study 2, the rs12722 C-to-T polymorphism in the COL5A1 was determined using the TaqMan SNP Genotyping Assay. Results: Study 1 revealed that the rs12722 polymorphism had no significant effect on range of motion in passive straight-leg-raise and sit-and-reach tests. Furthermore, there was no significant difference in passive muscle stiffness of the hamstring among the rs12722 genotypes. In Study 2, rs12722 genotype frequencies did not differ between the muscle injury and no muscle injury groups. Moreover, no association was observed between rs12722 polymorphism and severity of muscle injury. Conclusions: The present study does not support the view that COL5A1 rs12722 polymorphism has a role as a risk factor for sports-related muscle injury, or that it is a determinant for passive muscle stiffness in a Japanese population.

scholarly journals COL5A1 rs12722 polymorphism is not associated with passive muscle stiffness and sports-related muscle injury in Japanese athletes

2019 ◽  
Author(s):  
Eri Miyamoto-Mikami ◽  
Naokazu Miyamoto ◽  
Hiroshi Kumagai ◽  
Kosuke Hirata ◽  
Naoki Kikuchi ◽  
...  
Keyword(s):  
Risk Factor ◽  
Muscle Injury ◽  
Muscle Stiffness ◽  
Joint Flexibility ◽  
Genotype Frequencies ◽  
Significant Difference ◽  
Type V ◽  
Straight Leg Raise ◽  
Passive Muscle ◽  
Passive Muscle Stiffness

Abstract Background: Poor joint flexibility has been repeatedly proposed as a risk factor for muscle injury. The C-to-T polymorphism (rs12722) in the 3′-untranslated region of the collagen type V α1 chain gene ( COL5A1 ) is reportedly associated with joint flexibility. Flexibility of a normal joint is largely determined by passive muscle stiffness, which is influenced by intramuscular collagenous connective tissues including type V collagen. The present study aimed to test the hypothesis that the COL5A1 rs12722 polymorphism influences joint flexibility via passive muscle stiffness, and is accordingly associated with the incidence of muscle injury. Methods: In Study 1, we examined whether the rs12722 polymorphism is associated with joint flexibility and passive muscle stiffness in 363 healthy young adults. Joint flexibility was evaluated by passive straight-leg-raise and sit-and-reach tests, and passive muscle stiffness was measured using ultrasound shear wave elastography. In Study 2, the association of the rs12722 polymorphism with sports-related muscle injury was assessed in 1559 Japanese athletes. Muscle injury history and severity were assessed by a questionnaire. In both Study 1 and Study 2, the rs12722 C-to-T polymorphism in the COL5A1 was determined using the TaqMan SNP Genotyping Assay. Results: Study 1 revealed that the rs12722 polymorphism had no significant effect on range of motion in passive straight-leg-raise and sit-and-reach tests. Furthermore, there was no significant difference in passive muscle stiffness of the hamstring among the rs12722 genotypes. In Study 2, rs12722 genotype frequencies did not differ between the muscle injury and no muscle injury groups. Moreover, no association was observed between rs12722 polymorphism and severity of muscle injury. Conclusions: The present study does not support the view that COL5A1 rs12722 polymorphism has a role as a risk factor for sports-related muscle injury, or that it is a determinant for passive muscle stiffness in a Japanese population.

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