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Integrated treadmill stress testing and MR relaxometry (T1, T2, T2*): response in healthy calf muscles

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A. Time course of exercise induced changes in the left calf muscles of a 30 year old male volunteer. Axial T1 (top row), T2 (middle row) and T2* (bottom row) maps acquired before exercise (Pre), immediately after exercise (Post 1), at ~20 minutes (Post 9) and at ~45 minutes (Post 18) are shown. B. Exercise-induced time course changes of mean T1 (a), mean T2 (b) and mean T2* values (c) of the four calf muscle groups in 24 volunteers before (Pre) and after exercise (Post_1 to 18 - ~2:20 minute intervals). Graph in blue - TA, red - Sol, green - MG and purple - LG.
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Figure 1: A. Time course of exercise induced changes in the left calf muscles of a 30 year old male volunteer. Axial T1 (top row), T2 (middle row) and T2* (bottom row) maps acquired before exercise (Pre), immediately after exercise (Post 1), at ~20 minutes (Post 9) and at ~45 minutes (Post 18) are shown. B. Exercise-induced time course changes of mean T1 (a), mean T2 (b) and mean T2* values (c) of the four calf muscle groups in 24 volunteers before (Pre) and after exercise (Post_1 to 18 - ~2:20 minute intervals). Graph in blue - TA, red - Sol, green - MG and purple - LG.

Mentions: Twenty four healthy volunteers (age: 23-79 years, 12 males) performed Bruce treadmill stress test to at least 81% of age-predicted maximum heart rate on an MR-compatible treadmill adjacent to a 1.5T MRI system. Single slice axial T1 (TR/TE/TI = 1200/1.1/125, 205, 285, 1325, 1405, 1485, 2525, 2605, 2685, 3885 ms, FA = 35°, 1 NEX, 1.9 × 1.9 × 8 mm3, 1:02 min:s), T2 (TR/TET2p = 2500/0, 24, 36, 48, 60 ms, FA = 70°, 2 NEX, 1.9 × 1.9 × 8 mm3, 50 s) and T2* (TR/TEs = 740/2.1, 4.2, 6.6, 8.9, 11.3, 13.7, 16.1, 18.4 ms, 2 NEX, FA = 18°, 1.9 × 1.9 × 8 mm3, 31 s) maps were sequentially acquired for ~15 minutes at rest, and for ~45 minutes post exercise (Figure 1A). The relaxometric values from small regions in anterior tibialis (TA), soleus (Sol), medial (MG) and lateral gastrocnemius (LG) muscles were recorded, averaged over both legs and plotted against time (Figure 1B). Rest, peak exercise, peak-rest difference, end of exercise recovery and decay rate values was checked against age and exercise test duration using Pearson's correlation.


Integrated treadmill stress testing and MR relaxometry (T1, T2, T2*): response in healthy calf muscles
A. Time course of exercise induced changes in the left calf muscles of a 30 year old male volunteer. Axial T1 (top row), T2 (middle row) and T2* (bottom row) maps acquired before exercise (Pre), immediately after exercise (Post 1), at ~20 minutes (Post 9) and at ~45 minutes (Post 18) are shown. B. Exercise-induced time course changes of mean T1 (a), mean T2 (b) and mean T2* values (c) of the four calf muscle groups in 24 volunteers before (Pre) and after exercise (Post_1 to 18 - ~2:20 minute intervals). Graph in blue - TA, red - Sol, green - MG and purple - LG.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4043357&req=5

Figure 1: A. Time course of exercise induced changes in the left calf muscles of a 30 year old male volunteer. Axial T1 (top row), T2 (middle row) and T2* (bottom row) maps acquired before exercise (Pre), immediately after exercise (Post 1), at ~20 minutes (Post 9) and at ~45 minutes (Post 18) are shown. B. Exercise-induced time course changes of mean T1 (a), mean T2 (b) and mean T2* values (c) of the four calf muscle groups in 24 volunteers before (Pre) and after exercise (Post_1 to 18 - ~2:20 minute intervals). Graph in blue - TA, red - Sol, green - MG and purple - LG.
Mentions: Twenty four healthy volunteers (age: 23-79 years, 12 males) performed Bruce treadmill stress test to at least 81% of age-predicted maximum heart rate on an MR-compatible treadmill adjacent to a 1.5T MRI system. Single slice axial T1 (TR/TE/TI = 1200/1.1/125, 205, 285, 1325, 1405, 1485, 2525, 2605, 2685, 3885 ms, FA = 35°, 1 NEX, 1.9 × 1.9 × 8 mm3, 1:02 min:s), T2 (TR/TET2p = 2500/0, 24, 36, 48, 60 ms, FA = 70°, 2 NEX, 1.9 × 1.9 × 8 mm3, 50 s) and T2* (TR/TEs = 740/2.1, 4.2, 6.6, 8.9, 11.3, 13.7, 16.1, 18.4 ms, 2 NEX, FA = 18°, 1.9 × 1.9 × 8 mm3, 31 s) maps were sequentially acquired for ~15 minutes at rest, and for ~45 minutes post exercise (Figure 1A). The relaxometric values from small regions in anterior tibialis (TA), soleus (Sol), medial (MG) and lateral gastrocnemius (LG) muscles were recorded, averaged over both legs and plotted against time (Figure 1B). Rest, peak exercise, peak-rest difference, end of exercise recovery and decay rate values was checked against age and exercise test duration using Pearson's correlation.

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No MeSH data available.


Related in: MedlinePlus