The phrase "an average contraction of" is correct and usable in written English.
It can be used when discussing the typical reduction in size, length, or intensity of something, often in a scientific or mathematical context.
Example: "The study found that an average contraction of the material occurred under high pressure conditions."
Alternatives: "a typical reduction of" or "an average decrease in".
After 12 h, the contraction period for posterior body-wall muscles was extended with an average contraction period of 59.55 s (Supplementary Fig. 2B).
The ratio of force after the duration of an average contraction (∼0.3 second) and at very long times was 2.1 for the very softest rubber (∼1 kPa) and 1.3 for 15 kPa rubber.
In the present study based on volumetric heating, we reached an average local linear contraction of 31% that is statistically significantly higher than that reported with other energy-emitting liposuction technologies.
Distal esophageal amplitude (DEA) is an average of the contraction amplitude at 5 and 10 cm above the LES.
Analysis of the timing of the beginning and end of ventral abdominal contraction periods revealed that abdominal contractions begin an average of 0.79 sec into anterograde heart contraction periods (or 21% into the period; Table 2) and end within 0.25 sec of a heartbeat reversal (or 93% into the period).
The ventral abdomen contracts an average of 52.8 times per minute, but these contractions are aggregated within distinct contraction periods (consecutive contractions without rest) that last an average of 2.83 sec and contain 5.37 contractions each, indicating that when the abdomen contracts it does so at a rate of 1.98 Hz (Table 1).
The contraction frequency in thus obtained GF animals decreased significantly compared to controls, to an average of 4.6 ± 0.1 contractions per hour corresponding to about 60% of the control contraction frequency (Fig. 3a).
In all spinal cord transected and urethane-anesthetized rats, injection of saline solution (200 μl/min) into the pelvic urethra (urethral stimulation) before each drug administration provoked rapid rhythmic contractions of the striated bulbospongiosus muscles with an average mean of 4.57 ± 0.81 contractions.
The number of contractions per minute varied from 0.8 to 2.1 with an average of 1.41 ± 0.31 contractions.
