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

2021 ◽  
Vol 24 ◽  
pp. S29
Author(s):  
M. Boswell ◽  
S. Delp ◽  
M. Franchi ◽  
G. Lichtwark ◽  
P. Pincheira
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 ◽  
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

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

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 Ultrasound-derived Biceps Femoris Long Head Fascicle Length

2020 ◽  
Vol 52 (1) ◽  
pp. 233-243 ◽  
Author(s):  
MARTINO V. FRANCHI ◽  
DANIEL P. FITZE ◽  
BRENT J. RAITERI ◽  
DANIEL HAHN ◽  
JÖRG SPÖRRI
Keyword(s):  
Biceps Femoris ◽  
Fascicle Length ◽  
Long Head ◽  
Biceps Femoris Long Head

Eccentrically overloaded flywheel training increases biceps femoris long head fascicle length

2017 ◽  
Vol 20 ◽  
pp. 11
Author(s):  
J. Presland ◽  
D. Opar ◽  
C. Lee Dow ◽  
M. Bourne ◽  
M. Williams ◽  
...  
Keyword(s):  
Biceps Femoris ◽  
Fascicle Length ◽  
Long Head ◽  
Biceps Femoris Long Head

Poor agreement between ultrasound and novel MRI measures of biceps femoris long head fascicle length

2018 ◽  
Vol 21 ◽  
pp. S34
Author(s):  
F. Behan ◽  
R. Vermeulen ◽  
T. Smith ◽  
J. Arnaiz ◽  
R. Timmins ◽  
...  
Keyword(s):  
Biceps Femoris ◽  
Poor Agreement ◽  
Fascicle Length ◽  
Long Head ◽  
Biceps Femoris Long Head
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