Contraction

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Contraction

In a business cycle, the time between the peak and the bottom. That is, a contraction occurs between the end of economic growth and the end of the subsequent recession. Contractions are characterized by layoffs, a decline in GDP, and other negative factors. However, historically, contractions have tended not to last as long as expansions.
References in periodicals archive ?
Therefore, this is the position where the eccentric quadriceps contraction reaches a peak level, and the concentric contraction also starts at the peak level almost at the same time (Rees et al.
Additionally, the average EMG values of the VL in response to the prolonged vibration stimulation were also significantly reduced in eccentric contraction over concentric contraction.
Although the early phase of the concentric contraction elicited high muscle activity to overcome the load torque, the neuromuscular demand decreased rapidly for the biceps brachii throughout the middle and late phases.
The acute exercise based on concentric contractions was the type that resulted in the highest concentrations of HSP70 in heart, kidney, gastrocnemius and soleus, but not in the lung, suggesting that metabolic stress in the former tissues was more intense at the selected time of six hours post-exercise, the optimal time-point after stress (Jing et al.
Concentric contraction involves a shortening of the muscles under loading and is used to accelerate the body or move an object, as when you suddenly move in the opposite direction to hit the baseball.
As an example, for concentric contraction of the dorsal flexors, have the patient place the ankle joint in a neutral position (foot at a 90 [degrees] angle to the leg).