1. Linnamo et al., Department of Biology of Physical Activity, University of Jyväskylä, Finland
FAM frequency response method as a tool to measure neuromuscular and
physiological recovery after eccentric and concentric exercise
Baseline
The purpose of this study was to examine if FAM observed between FAM and HR variables of
frequency response method can be used as a tool which the strongest ones were with HF power and
to measure neuromuscular and physiological LF power. FAM may also be sensitive to the
recovery after eccentric and concentric exercise changes in vagal and symphatic activity of the
performed by cycling dynamometer. Twelve autonomous nervous system.
healthy male volunteer test subjects participated to
Most of the neuromuscular variables showed that
the study. Both eccentric and concentric
the effect of eccentric exercise was more
measurement session consisted of five
pronounced after eccentric than concentric
measurement: pre-fatigue, post-fatigue, 2h after,
exercise. Strongest correlations between
2d after, and 7d after fatigue.
neuromuscular and FAM variables were found
Measurements were:
after eccentric exercise in MVC whereas after
1. blood sample
concentric exercise also variables related to power
2. orthostatic test; heart rate (HR) variability
correlated with FAM.
3. neuromuscular measurements
Main findings of the study were as follows:
4. FAM measurements
Results 1. Eccentric exercise led to a longer
The results of this study shows significant recovery than concentric exercise which
changes is leukocytes, lymphocytes, neutrophils, was seen most clearly in FAM variables
IL-6, TNF-alpha and cortisol especially and CK values.
immediately after and two hours after the 2. Strongest correlations were found
exercise. FAM-variables were found to correlate between FAM variables and lymphocytes
strongly with some of the measured blood and neutrophiles immediately and 2h after
variables, in particular with lymphocytes and after eccentric exercise
neutrophils which are inflammation markers 3. Several correlations were found 7d after
suggesting that the changes observed with FAM concentric exercise which was not the
may be sensitive to these markers. Serum CK case after eccentric exercise.
after eccentric exercise was also found to be 4. There did not seem to be any major
correlated with FAM indicating that FAM may differences between the right and the left
also be sensitive to muscle damage. side or between any single stimulation
intensity.
Neither exercise caused any major changes in HR
variables. However, several correlations were