The effect of high or low volume Nordic hamstring exercise training on eccentric strength and biceps femoris long head architectural adaptations

2017 ◽  
Vol 20 ◽  
pp. 12 ◽  
Author(s):  
J. Presland ◽  
R. Timmins ◽  
M. Bourne ◽  
M. Williams ◽  
D. Opar
Keyword(s):  
Exercise Training ◽  
Biceps Femoris ◽  
Low Volume ◽  
Long Head ◽  
Biceps Femoris Long Head

Hamstring Eccentric Strengthening Program: Does Training Volume Matter?

2020 ◽  
Vol 15 (1) ◽  
pp. 81-90 ◽  
Author(s):  
Mathieu Lacome ◽  
Simon Avrillon ◽  
Yannick Cholley ◽  
Ben M. Simpson ◽  
Gael Guilhem ◽  
...  
Keyword(s):  
Biceps Femoris ◽  
High Volume ◽  
Soccer Players ◽  
Eccentric Training ◽  
Fascicle Length ◽  
Knee Flexor ◽  
Low Volume ◽  
Long Head ◽  
Biceps Femoris Long Head ◽  
Flexor Strength

Aim: To compare the effect of low versus high volume of eccentric-biased hamstring training programs on knee-flexor strength and fascicle length changes in elite soccer players. Methods: A total of 19 elite youth soccer players took part in this study and were randomly assigned into 2 subgroups. For 6 weeks in-season, the groups performed either a low-volume (1 set per exercise; 10 repetitions in total) or a high-volume (4 sets; 40 repetitions) eccentric training of their knee flexors. After 6-weeks midtraining (MID), players performed the alternate training regimen. Each training set consisted of 4 repetitions of the Nordic hamstring exercise and 6 repetitions of the bilateral stiff-leg deadlift. Eccentric knee-flexor strength (NordBord) as well as biceps femoris long head and semimembranosus fascicle length (scanned with ultrasound scanner) were assessed during pretraining (PRE), MID, and posttraining (POST) tests. Results: Knee-flexor eccentric strength very likely increased from PRE to MID (low volume: +11.3% [7.8%] and high volume: 11.4% [5.3%]), with a possibly-to-likely increase in biceps femoris long head (+4.5% [5.0%] and 4.8% [2.5%]) and semimembranosus (+4.3% [4.7%] and 6.3% [6.3%]) fascicle length in both groups. There was no substantial changes between MID and POST. Overall, there was no clear between-group difference in the changes from PRE to MID and MID to POST for neither knee-flexor eccentric strength, biceps femoris long head, nor semimembranosus fascicle length. Conclusions: Low-volume knee-flexor eccentric training is as effective as a greater training dose to substantially improve knee-flexor strength and fascicle length in-season in young elite soccer players. Low volume is, however, likely more appropriate to be used in an elite team facing congested schedules.

The effect of Nordic hamstring exercise training volume on biceps femoris long head architectural adaptation

2018 ◽  
Vol 28 (7) ◽  
pp. 1775-1783 ◽  
Author(s):  
J. D. Presland ◽  
R. G. Timmins ◽  
M. N. Bourne ◽  
M. D. Williams ◽  
D. A. Opar
Keyword(s):  
Exercise Training ◽  
Biceps Femoris ◽  
Training Volume ◽  
Long Head ◽  
Biceps Femoris Long Head

scholarly journals Biceps femoris long head sarcomere and fascicle length adaptations after three weeks of eccentric exercise training

2021 ◽  
Author(s):  
Patricio A. Pincheira ◽  
Melissa A. Boswell ◽  
Martino V. Franchi ◽  
Scott L. Delp ◽  
Glen A. Lichtwark
Keyword(s):  
Exercise Training ◽  
Eccentric Exercise ◽  
Biceps Femoris ◽  
Fascicle Length ◽  
Long Head ◽  
Biceps Femoris Long Head

scholarly journals Biceps femoris long head sarcomere and fascicle length adaptations after three weeks of eccentric exercise training

2021 ◽  
Author(s):  
Patricio A. Pincheira ◽  
Melissa A. Boswell ◽  
Martino V. Franchi ◽  
Scott L. Delp ◽  
Glen A. Lichtwark
Keyword(s):  
Exercise Training ◽  
Eccentric Exercise ◽  
Sarcomere Length ◽  
Biceps Femoris ◽  
Muscle Fibres ◽  
Fascicle Length ◽  
Muscle Fascicle ◽  
In Series ◽  
Long Head ◽  
Biceps Femoris Long Head

AbstractPurposeEccentric exercise is widely used to increase muscle fascicle lengths and thus decrease the risk of muscle strain injuries. However, the mechanisms behind this protection are still unknown. The aim of this study was to determine whether Biceps femoris long head (BFlh) fascicle length increases in response to three weeks of eccentric exercise training are the result of addition of in-series sarcomeres within muscle fibres.MethodsTen recreationally active participants (age: 27 ± 3 years, mass: 70 ± 14 kg, height: 174 ± 9 cm) completed three weeks of Nordic hamstring exercise (NHE) training. We collected in vivo sarcomere and muscle fascicle images of the BFlh in two regions (central and distal), utilising microendoscopy and 3D ultrasonography. These images allowed us to estimate sarcomere length, sarcomere number and fascicle lengths before and after the training intervention.ResultsEccentric knee flexion strength increased after the training (15%, P < 0.001, ηp2= 0.75). Further, we found a significant increase in fascicle (21%, P < 0.001, ηp2 = 0.81) and sarcomere (17%, P < 0.001, ηp2 = 0.9) lengths in the distal but not in the central portion of the muscle. The estimated number of in series sarcomeres did not change in either region.ConclusionFascicle length adaptations appear to be heterogeneous in the BFlf in response to three weeks of NHE training. An increase in sarcomere length, rather than the addition of sarcomeres in series, appears to be underlying this adaptation. The mechanism driving regional increases in fascicle and sarcomere length remain unknown, but we speculate it may be driven by regional changes in the passive tension of muscle or connective tissue adaptations.

scholarly journals Poor agreement between ultrasound and inbuilt diffusion tensor MRI measures of biceps femoris long head fascicle length

2018 ◽  
Vol 2 (2) ◽  
pp. 58-63 ◽  
Author(s):  
Fearghal P. Behan ◽  
Robin Vermeulen ◽  
Tessa Smith ◽  
Javier Arnaiz ◽  
Rodney Whiteley ◽  
...  
Keyword(s):  
Diffusion Tensor ◽  
Biceps Femoris ◽  
Diffusion Tensor Mri ◽  
Poor Agreement ◽  
Fascicle Length ◽  
Long Head ◽  
Biceps Femoris Long Head

Muscle- and Region-Specific Associations Between Muscle Size and Muscular Strength During Hip Extension and Knee Flexion in the Hamstrings

2021 ◽  
pp. 1-6
Author(s):  
Raki Kawama ◽  
Masamichi Okudaira ◽  
Hirohiko Maemura ◽  
Satoru Tanigawa
Keyword(s):  
Knee Flexion ◽  
Muscular Strength ◽  
Sports Injuries ◽  
Biceps Femoris ◽  
Muscle Size ◽  
Cross Sectional ◽  
Long Head ◽  
Hip Extension ◽  
Flexion Strength ◽  
Biceps Femoris Long Head

Context: Strength deficits of the hamstrings following sports injuries decrease athletic performance and increase the risk of injury recurrence. Previous studies have shown a high correlation between the muscular strength during hip-extension and knee-flexion and total muscle size of the hamstrings. However, it remains unclear which region of the individual hamstring muscles is closely associated with muscular strength. Objective: To investigate the relationship between the size of each region of the individual hamstring muscles and muscular strength during hip extension and knee flexion. Design: Within-subject repeated measures. Setting: University laboratory. Participants: Twenty healthy young male volunteers who regularly engaged in sports activities. Outcome Measures: Anatomical cross-sectional areas were acquired from the proximal, middle, and distal regions of the biceps femoris long head, biceps femoris short head, semitendinosus, and semimembranosus. Hip-extension and knee-flexion strength were measured during maximal voluntary isometric and concentric contractions (angular velocities of 60°/s and 180°/s). Results: The anatomical cross-sectional area of the distal regions in biceps femoris long head (r = .525–.642) and semitendinosus (r = .567) were significantly correlated with hip-extension strength under all conditions and only at an angular velocity of 180°/s, respectively. Meanwhile, anatomical cross-sectional areas of the distal regions in biceps femoris short head (r = .587–.684) and semimembranosus (r = .569–.576) were closely associated with knee-flexion strength under all conditions. Conclusion: These results suggest that muscle size in the distal regions of biceps femoris long head and semitendinosus greatly contributes to the production of hip-extension strength, whereas that of biceps femoris short head and semimembranosus significantly contributes to the generation of knee-flexion strength. These findings could be useful for designing training and rehabilitation programs to efficiently improve strength deficits following sports injuries such as strain injury and anterior cruciate ligament tears.

Biceps femoris long head muscle fascicle length does not differ between sexes

2019 ◽  
Vol 37 (21) ◽  
pp. 2452-2458
Author(s):  
Fearghal P. Behan ◽  
Rachael Moody ◽  
Tejal Sarika Patel ◽  
Edward Lattimore ◽  
Thomas M. Maden-Wilkinson ◽  
...  
Keyword(s):  
Biceps Femoris ◽  
Fascicle Length ◽  
Muscle Fascicle ◽  
Long Head ◽  
Biceps Femoris Long Head

scholarly journals MR biomarkers predict clinical function in Duchenne muscular dystrophy

Neurology ◽  
2020 ◽  
Vol 94 (9) ◽  
pp. e897-e909 ◽  
Author(s):  
Alison M. Barnard ◽  
Rebecca J. Willcocks ◽  
William T. Triplett ◽  
Sean C. Forbes ◽  
Michael J. Daniels ◽  
...  
Keyword(s):  
Duchenne Muscular Dystrophy ◽  
Muscular Dystrophy ◽  
Lower Extremity ◽  
Vastus Lateralis ◽  
Strong Relationship ◽  
Biceps Femoris ◽  
Loss Of Function ◽  
Long Head ◽  
Biceps Femoris Long Head ◽  
Over Time

ObjectiveTo investigate the potential of lower extremity magnetic resonance (MR) biomarkers to serve as endpoints in clinical trials of therapeutics for Duchenne muscular dystrophy (DMD) by characterizing the longitudinal progression of MR biomarkers over 48 months and assessing their relationship to changes in ambulatory clinical function.MethodsOne hundred sixty participants with DMD were enrolled in this longitudinal, natural history study and underwent MR data acquisition of the lower extremity muscles to determine muscle fat fraction (FF) and MRI T2 biomarkers of disease progression. In addition, 4 tests of ambulatory function were performed. Participants returned for follow-up data collection at 12, 24, 36, and 48 months.ResultsLongitudinal analysis of the MR biomarkers revealed that vastus lateralis FF, vastus lateralis MRI T2, and biceps femoris long head MRI T2 biomarkers were the fastest progressing biomarkers over time in this primarily ambulatory cohort. Biomarker values tended to demonstrate a nonlinear, sigmoidal trajectory over time. The lower extremity biomarkers predicted functional performance 12 and 24 months later, and the magnitude of change in an MR biomarker over time was related to the magnitude of change in function. Vastus lateralis FF, soleus FF, vastus lateralis MRI T2, and biceps femoris long head MRI T2 were the strongest predictors of future loss of function, including loss of ambulation.ConclusionsThis study supports the strong relationship between lower extremity MR biomarkers and measures of clinical function, as well as the ability of MR biomarkers, particularly those from proximal muscles, to predict future ambulatory function and important clinical milestones.ClinicalTrials.gov identifierNCT01484678.

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