Biceps femoris aponeurosis size

A potential risk factor for strain injury?

Pavlos E. Evangelidis, Garry J. Massey, Matthew T G Pain, Jonathan P. Folland

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Purpose A disproportionately small biceps femoris long head (BFlh) proximal aponeurosis has been suggested as a risk factor for hamstring strain injury by concentrating mechanical strain on the surrounding muscle tissue. However, the size of the BFlh aponeurosis relative to BFlh muscle size, or overall knee flexor strength, has not been investigated. This study aimed to examine the relationship of BFlh proximal aponeurosis area with muscle size (maximal anatomical cross-sectional area (ACSAmax)) and knee flexor strength (isometric and eccentric). Methods Magnetic resonance images of the dominant thigh of 30 healthy young males were analyzed to measure BFlh proximal aponeurosis area and muscle ACSAmax. Participants performed maximum voluntary contractions to assess knee flexion maximal isometric and eccentric torque (at 50° s-1 and 350° s-1). Results BFlh proximal aponeurosis area varied considerably between participants (more than fourfold, range = 7.5-33.5 cm2, mean = 20.4 ± 5.4 cm2, coefficient of variation = 26.6%) and was not related to BFlh ACSAmax (r = 0.04, P = 0.83). Consequently, the aponeurosis/muscle area ratio (defined as BFlh proximal aponeurosis area divided by BFlh ACSAmax) exhibited sixfold variability, being 83% smaller in one individual than another (0.53 to 3.09, coefficient of variation = 32.5%). Moreover, aponeurosis size was not related to isometric (r = 0.28, P = 0.13) or eccentric knee flexion strength (r = 0.24, P ≥ 0.20). Conclusion BFlh proximal aponeurosis size exhibits high variability between healthy young men, and it was not related to BFlh muscle size or knee flexor strength. Individuals with a relatively small aponeurosis may be at increased risk of hamstring strain injury.

Original languageEnglish
Pages (from-to)1383-1389
Number of pages7
JournalMedicine and Science in Sports and Exercise
Volume47
Issue number7
DOIs
Publication statusPublished - 2015 Jul 4
Externally publishedYes

Fingerprint

Wounds and Injuries
Knee
Muscles
Hamstring Muscles
Aponeurosis
Torque
Thigh
Magnetic Resonance Spectroscopy

Keywords

  • APONEUROSIS MORPHOLOGY
  • BICEPS FEMORIS LONG HEAD
  • HAMSTRINGS
  • KNEE FLEXION STRENGTH
  • MRI
  • MUSCLE-TENDON UNIT SIZE

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Biceps femoris aponeurosis size : A potential risk factor for strain injury? / Evangelidis, Pavlos E.; Massey, Garry J.; Pain, Matthew T G; Folland, Jonathan P.

In: Medicine and Science in Sports and Exercise, Vol. 47, No. 7, 04.07.2015, p. 1383-1389.

Research output: Contribution to journalArticle

Evangelidis, Pavlos E. ; Massey, Garry J. ; Pain, Matthew T G ; Folland, Jonathan P. / Biceps femoris aponeurosis size : A potential risk factor for strain injury?. In: Medicine and Science in Sports and Exercise. 2015 ; Vol. 47, No. 7. pp. 1383-1389.
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abstract = "Purpose A disproportionately small biceps femoris long head (BFlh) proximal aponeurosis has been suggested as a risk factor for hamstring strain injury by concentrating mechanical strain on the surrounding muscle tissue. However, the size of the BFlh aponeurosis relative to BFlh muscle size, or overall knee flexor strength, has not been investigated. This study aimed to examine the relationship of BFlh proximal aponeurosis area with muscle size (maximal anatomical cross-sectional area (ACSAmax)) and knee flexor strength (isometric and eccentric). Methods Magnetic resonance images of the dominant thigh of 30 healthy young males were analyzed to measure BFlh proximal aponeurosis area and muscle ACSAmax. Participants performed maximum voluntary contractions to assess knee flexion maximal isometric and eccentric torque (at 50° s-1 and 350° s-1). Results BFlh proximal aponeurosis area varied considerably between participants (more than fourfold, range = 7.5-33.5 cm2, mean = 20.4 ± 5.4 cm2, coefficient of variation = 26.6{\%}) and was not related to BFlh ACSAmax (r = 0.04, P = 0.83). Consequently, the aponeurosis/muscle area ratio (defined as BFlh proximal aponeurosis area divided by BFlh ACSAmax) exhibited sixfold variability, being 83{\%} smaller in one individual than another (0.53 to 3.09, coefficient of variation = 32.5{\%}). Moreover, aponeurosis size was not related to isometric (r = 0.28, P = 0.13) or eccentric knee flexion strength (r = 0.24, P ≥ 0.20). Conclusion BFlh proximal aponeurosis size exhibits high variability between healthy young men, and it was not related to BFlh muscle size or knee flexor strength. Individuals with a relatively small aponeurosis may be at increased risk of hamstring strain injury.",
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N2 - Purpose A disproportionately small biceps femoris long head (BFlh) proximal aponeurosis has been suggested as a risk factor for hamstring strain injury by concentrating mechanical strain on the surrounding muscle tissue. However, the size of the BFlh aponeurosis relative to BFlh muscle size, or overall knee flexor strength, has not been investigated. This study aimed to examine the relationship of BFlh proximal aponeurosis area with muscle size (maximal anatomical cross-sectional area (ACSAmax)) and knee flexor strength (isometric and eccentric). Methods Magnetic resonance images of the dominant thigh of 30 healthy young males were analyzed to measure BFlh proximal aponeurosis area and muscle ACSAmax. Participants performed maximum voluntary contractions to assess knee flexion maximal isometric and eccentric torque (at 50° s-1 and 350° s-1). Results BFlh proximal aponeurosis area varied considerably between participants (more than fourfold, range = 7.5-33.5 cm2, mean = 20.4 ± 5.4 cm2, coefficient of variation = 26.6%) and was not related to BFlh ACSAmax (r = 0.04, P = 0.83). Consequently, the aponeurosis/muscle area ratio (defined as BFlh proximal aponeurosis area divided by BFlh ACSAmax) exhibited sixfold variability, being 83% smaller in one individual than another (0.53 to 3.09, coefficient of variation = 32.5%). Moreover, aponeurosis size was not related to isometric (r = 0.28, P = 0.13) or eccentric knee flexion strength (r = 0.24, P ≥ 0.20). Conclusion BFlh proximal aponeurosis size exhibits high variability between healthy young men, and it was not related to BFlh muscle size or knee flexor strength. Individuals with a relatively small aponeurosis may be at increased risk of hamstring strain injury.

AB - Purpose A disproportionately small biceps femoris long head (BFlh) proximal aponeurosis has been suggested as a risk factor for hamstring strain injury by concentrating mechanical strain on the surrounding muscle tissue. However, the size of the BFlh aponeurosis relative to BFlh muscle size, or overall knee flexor strength, has not been investigated. This study aimed to examine the relationship of BFlh proximal aponeurosis area with muscle size (maximal anatomical cross-sectional area (ACSAmax)) and knee flexor strength (isometric and eccentric). Methods Magnetic resonance images of the dominant thigh of 30 healthy young males were analyzed to measure BFlh proximal aponeurosis area and muscle ACSAmax. Participants performed maximum voluntary contractions to assess knee flexion maximal isometric and eccentric torque (at 50° s-1 and 350° s-1). Results BFlh proximal aponeurosis area varied considerably between participants (more than fourfold, range = 7.5-33.5 cm2, mean = 20.4 ± 5.4 cm2, coefficient of variation = 26.6%) and was not related to BFlh ACSAmax (r = 0.04, P = 0.83). Consequently, the aponeurosis/muscle area ratio (defined as BFlh proximal aponeurosis area divided by BFlh ACSAmax) exhibited sixfold variability, being 83% smaller in one individual than another (0.53 to 3.09, coefficient of variation = 32.5%). Moreover, aponeurosis size was not related to isometric (r = 0.28, P = 0.13) or eccentric knee flexion strength (r = 0.24, P ≥ 0.20). Conclusion BFlh proximal aponeurosis size exhibits high variability between healthy young men, and it was not related to BFlh muscle size or knee flexor strength. Individuals with a relatively small aponeurosis may be at increased risk of hamstring strain injury.

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