Task and intensity alters the rms proportionality ratio in the triceps surae

Ball, Nick; Scurr, Joanna

doi:10.1002/mus.24469

Cited by 8 publications

(5 citation statements)

References 42 publications

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“…The reason for this difference may be due to the differential contributions of the LG and MG to isometric peak force production. 26 However, the MG was found to be the greatest contributor to triceps surae activation during maximal voluntary isometrics contractions 26 and so one might have expected MG architecture to have demonstrated a higher association to IMTP peak force capacity in the present study. The fact that MG muscle thickness and pennation angle was recently reported to be correlated with 1-RM power clean performance (ρ = 0.48-0.54, p < 0.05), 6 a task which is highly related to IMTP peak force (r = 0.74, p ≤ 0.05), 16 emphasises this notion.…”

Section: Discussionmentioning

confidence: 55%

“…Although the associations of IMTP peak force with both VL and LG muscle structure have been recently explored in elite and junior surfers 3,12 , this population represent a very specific athletic group and thus the relationships noted may lack transferability. Furthermore, medial gastrocnemius (MG) muscle activation was recently reported to be around 10.5% greater than LG activation across various dynamic and isometric tasks 26 and so establishing relationships between MG muscle structure and IMTP peak force may be of greater interest to practitioners. The aims of the present study were, therefore, to explore whether aspects of VL and MG muscle structure were related to the IMTP peak force capacity of collegiate athletes from a variety of sports.…”

Section: Introductionmentioning

confidence: 99%

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Relationships between lower body muscle structure and isometric mid-thigh pull peak force

McMahon¹,

Stapley²,

Suchomel³

et al. 2015

Journal of Trainology

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Objectives:To explore relationships between aspects of vastus lateralis (VL) and medial gastrocnemius (MG) muscle structure (muscle thickness, fascicle length and pennation angle) and isometric mid-thigh pull (IMTP) peak force capacity. Design and Methods:Fifteen male collegiate athletes (height 1.79 ± 0.05 m; body mass 82.8 ± 8.1 kg, age 23.2 ± 3.4 years), from a wide range of field-based sports, had sonographic images of their VL and MG musculature (for the dominant leg) recorded at rest before participating in a standardized maximal IMTP protocol.Results: Intraclass correlation coefficients (≥ 0.91, p < 0.001) and coefficient of variation percentages (≤ 2.5%) showed excellent reliability of the muscle structure and IMTP peak force measurements. A large positive relationship was found between VL muscle thickness and absolute IMTP peak force (r = 0.62, p < 0.01, power = 0.89). Moderate, but non-significant, relationships were observed between VL pennation angle and both absolute (r = 0.41, p = 0.06, power = 0.60) and relative (r = 0.39, p = 0.08, power = 0.46) IMTP peak force. A small non-significant correlation was noted between VL muscle thickness and relative IMTP peak force (r = 0.26, p = 0.19). No aspect of MG muscle structure was significantly correlated with IMTP peak force. Conclusion:The VL muscle thickness of male collegiate athletes' dominant leg is largely correlated to their bilateral absolute IMTP peak force capacity (demonstrating 38% shared variance). Practitioners should, therefore, develop hypertrophy of male collegiate athletes' VL musculature through appropriately designed strength training programs.(Journal of Trainology 2015;4:43-48)

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Section: Discussionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Relationships between lower body muscle structure and isometric mid-thigh pull peak force

McMahon¹,

Stapley²,

Suchomel³

et al. 2015

Journal of Trainology

View full text Add to dashboard Cite

show abstract

“…Using this approach, recent studies have demonstrated significant correlations between distinct aspects of lateral gastrocnemius (LG) muscle architecture and athletic performance [ 3 , 4 ]. Medial gastrocnemius (MG) activation was, however, recently reported to be 4.0% and 10.5% greater than soleus and LG activation, respectively, across a range of dynamic and isometric tasks [ 5 ]. The aforementioned results suggest that the MG contributes to athletic performance to a greater extent than the other triceps surae muscles and thus MG architectural properties may also demonstrate stronger relationships to performance tasks and elicit greater training adaptations in comparison to soleus and LG.…”

Section: Introductionmentioning

confidence: 99%

Within- and between-session reliability of medial gastrocnemius architectural properties

2016

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This study aimed to determine the within- and between-session reliability of medial gastrocnemius (MG) architecture (e.g. muscle thickness (MT), fascicle length (FL) and pennation angle (PA)), as derived via ultrasonography followed by manual digitization. A single rater recorded three ultrasound images of the relaxed MG muscle belly for both legs of 16 resistance trained males, who were positioned in a pronated position with their knees fully extended and the ankles in a neutral (e.g. 90°) position. A subset of participants (n = 11) were retested under the same conditions ~48-72 hours after baseline testing. The same rater manually digitized each ultrasound image on three occasions to determine MG MT, FL and PA before pooling the data accordingly to allow for within-image (n = 96), between-image (n = 32) and between-session reliability (n = 22) to be determined. Intraclass correlation coefficients (ICCs) demonstrated excellent within-image (ICCs = 0.99-1.00, P < 0.001) and very good between-image (ICCs = 0.83-0.95, P < 0.001) and between-session (ICCs = 0.89-0.95, P < 0.001) reliability for MT, FL and PA. Between-session coefficient of variation was low (≤ 3.6%) for each architectural parameter and smallest detectible difference values of 10.6%, 11.4% and 9.8% were attained for MT, FL and PA, respectively. Manually digitizing ultrasound images of the MG muscle at rest yields highly reliable measurements of its architectural properties. Furthermore, changes in MG MT, FL and PA of ≥ 10.6%, 11.4% and 9.8% respectively, as brought about by any form of intervention, should be considered meaningful.

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“…), as part of a centrally derived recruitment strategy to sustain force when VL contraction is impaired. This is further supported by work on the planter flexors which demonstrated different extents of synergistic compensation over various types of exercises (Ball and Scurr ). To establish this, further study is needed to measure the other quadriceps muscles following EO such as the rectus femoris and vastus medialis.…”

Section: Discussionmentioning

confidence: 72%

Reduced firing rates of high threshold motor units in response to eccentric overload

Balshaw

Pahar

Chesham

et al. 2017

Physiological Reports

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Acute responses of motor units were investigated during submaximal voluntary isometric tasks following eccentric overload (EO) and constant load (CL) knee extension resistance exercise. Ten healthy resistance‐trained participants performed four experimental test sessions separated by 5 days over a 20 day period. Two sessions involved constant load and the other two used eccentric overload. EO and CL used both sessions for different target knee eccentric extension phases; one at 2 sec and the other at 4 sec. Maximal voluntary contractions (MVC) and isometric trapezoid efforts for 10 sec at 70% MVC were completed before and after each intervention and decomposed electromyography was used to measure motor unit firing rate. The firing rate of later recruited, high‐threshold motor units declined following the 2‐sec EO but was maintained following 2sec CL (P < 0.05), whereas MUFR for all motor units were maintained for both loading types following 4‐sec extension phases. MVC and rate of force development where maintained following both EO and CL and 2 and 4 sec phases. This study demonstrates a slower firing rate of high‐threshold motor units following fast eccentric overload while MVC was maintained. This suggests that there was a neuromuscular stimulus without cost to the force‐generating capacity of the knee extensors.

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Task and intensity alters the rms proportionality ratio in the triceps surae

Abstract: Task and intensity influences the ratio of activation in the triceps surae.

Cited by 8 publications

References 42 publications

Relationships between lower body muscle structure and isometric mid-thigh pull peak force

Relationships between lower body muscle structure and isometric mid-thigh pull peak force

Within- and between-session reliability of medial gastrocnemius architectural properties

Reduced firing rates of high threshold motor units in response to eccentric overload

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