Keywords:
Musculoskeletal soft tissue, MR physics, MR, Physiological studies, Segmentation
Authors:
S. Kaspar, J. Reinhardt, M. Gloor, C. Stippich, D. Fischer, A. Fischmann; Basle/CH
DOI:
10.1594/ecr2013/C-1294
Results
There was a significant training effect: The mean number per set increased from 26 (19 – 40) in the first training session to 52 (40 -70) in the last training session.
However training success was very inhomogeneous ranging from 0 to 46 additional repeats per set (mean 25,
SD = 13).
Mean fat fraction at rest was 7.1% in both legs in the initial scan.
After the training period,
mean fat fraction at rest was 6.6% in the non-trained leg (figure 3a) and to 6.8% in the non-trained leg (figure 3b),
a non-significant change (p = 0.06 and 0.14 respectively).
Separate evaluation of the knee extensors (quadriceps) and knee flexors showed no significant difference in either of the subgroups.
As previously published,
fat fraction decreased during the initial exercise session to 6.5% and 6.7% in the trained and non-trained legs respectively (figure 4a).
This result could be repeated in the second exercise session after the training period (figure 4b).
Fat fraction decreased to 6.5% in both legs,
which was significant for the non-trained leg (p = .03) but not in the trained leg (p = .09) (figure 5).
The exercise sessions did not increase the cross sectional area in any of the muscles examined,
neither before nor after the training period:
Before the training period,
CSA at rest in the quadriceps was 55,9 cm2 and 57.1cm2 in the untrained and trained legs respectively.
After the training period quadriceps CSA showed a non-significant increase to 56.2 cm2 and 57.2cm2 in the untrained and trained leg respectively.
The exercise sessions did not change the cross sectional area in any of the muscles examined,
neither before nor after the training period (figure 6)
We analysed,
whether success in training,
as indicated by increased maximal number of repeats,
correlated to change in CSA (figure 7) or FF and found no significant correlation (r2 = 0.08 to 0.17)