TY  - JOUR
A1  - Kellis, Eleftherios
A1  - Ellinoudis, Athanasios
A1  - Intziegianni, Konstantina
T1  - Reliability of sonographic assessment of biceps femoris distal tendon strain during passive stretching
JF  - Ultrasound in Medicine & Biology
N2  - The purpose of this study was to determine the intra-rater, inter-examiner and inter-observer reliability of biceps femoris long head (BFlh) tendon strain using ultrasound imaging. Nineteen patients (age: 20.4 +/- 0.35 y) were tested twice with a 1-wk interval. Each session included passive stretching from three different hip positions. Tests were performed independently by two examiners while BFlh tendon displacement (mm) and strain (%) were manually extracted from ultrasound video footages by two observers. Intra-rater comparisons revealed an intra-class correlation coefficient (ICC2,1) range of 0.87 to 0.98 and a variability less than 4.74%. Interexaminer comparisons revealed an ICC2,1 range of 0.83 to 0.99 and less than 4.69% variability. Inter-observer ICCs ranged from 0.93 to 0.97 with variability less than 4.89%. Using a well-defined scanning protocol, two experienced examiners attained high levels of intra-rater agreement, with similarly excellent results for inter-rater and inter-observer reliability for BFlh tendon displacement and strain. (E-mail: ekellis@phed-sr.auth.gr) (C) 2017 World Federation for Ultrasound in Medicine & Biology.
KW  - Hamstring
KW  - Tendon
KW  - Strain injury
KW  - Ultrasound
KW  - Imaging
KW  - Muscle
Y1  - 2017
U6  - https://doi.org/10.1016/j.ultrasmedbio.2017.04.018
SN  - 0301-5629
SN  - 1879-291X
VL  - 43
SP  - 1769
EP  - 1779
PB  - Elsevier
CY  - New York
ER  - 
TY  - JOUR
A1  - Kellis, Eleftherios
A1  - Ellinoudis, Athanasios
A1  - Intziegianni, Konstantina
A1  - Kofotolis, Nikolaos
T1  - Muscle thickness during core stability exercises in children and adults
JF  - Journal of human kinetics
N2  - Core stability exercises are regular part of exercise programs for asymptomatic individuals across ages. The purpose of this study was to examine deep abdominal and multifidus muscle thickness in children and adults and to determine reliability of the rehabilitative ultrasound (RUSI) imaging. Transversus abdominis and lumbar multifidus thickness at rest and during core stability exercise were examined in pre-pubertal children (N = 23), adolescents (N = 20), young adults (N = 21) and middle-aged adults (N = 22). Thirty-nine participants were re-tested one week after to establish reliability. Muscle thickness at rest was lower in children and adolescents compared with young and middle-aged adults (p < 0.008). Young adults displayed the highest relative transversus abdominis thickness upon contraction (p < 0.008). Lumbar multfidus contraction thickness was greater in young-adults than middle-aged adults and prepubertal children (p < 0.008), but it was similar between young-adults and adolescents (p > 0.008). Reliability was high for both muscles (ICC3,3 = 0.76 - 0.99). The age-related differences in muscle thickness indicate that core stability exercises may be beneficial for children and middle-aged adults.
KW  - childhood
KW  - musculoskeletal ultrasound
KW  - repeatability
KW  - core exercise
KW  - core stability
Y1  - 2020
U6  - https://doi.org/10.2478/hukin-2019-0079
SN  - 1640-5544
SN  - 1899-7562
VL  - 71
IS  - 1
SP  - 131
EP  - 144
PB  - Academy of Physical Education
CY  - Katowice
ER  -