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Post mortem changes in skeletal muscle proton spin-lattice relaxation times
Physiological Chemistry and Physics and Medical NMR
|January 1, 1984
Summary
Post mortem changes in skeletal muscle proton spin-lattice relaxation time (T1) were re-examined. New methods indicate T1 is stable for four hours post mortem, contradicting earlier findings.
Area of Science:
- Biophysics
- Biomolecular Physics
- NMR Spectroscopy
Background:
- Early post mortem changes in skeletal muscle proton spin-lattice relaxation time (T1) can affect in vitro tissue analysis.
- Previous studies reported significant T1 alterations shortly after death.
Purpose of the Study:
- To re-evaluate the impact of post mortem interval on skeletal muscle T1.
- To refine measurement techniques for reliable T1 assessment in post mortem tissues.
Main Methods:
- Proton spin-lattice relaxation time (T1) measurements were performed on skeletal muscle samples.
- T1 decay curves were analyzed using two methods: decay over two orders of magnitude and decay over one order of magnitude.
- The influence of measurement range on the observed T1 relaxation components was investigated.
Main Results:
- T1 decay curves exhibited multi-exponential behavior when signal intensity decayed over two orders of magnitude.
- A single exponential relaxation time component was observed when signal intensity decayed over approximately one order of magnitude.
- Using the single-component method, no significant post mortem T1 changes were detected in skeletal muscle within the first four hours, with changes appearing later.
Conclusions:
- The single-component T1 measurement method provides a representative average T1 value for skeletal muscle.
- Skeletal muscle T1 relaxation time is stable for at least four hours post mortem under the conditions studied.
- These findings suggest that in vitro tissue analysis may be less affected by early post mortem changes than previously reported.