Before revision:  The temporal irreversibility researches on cardiac activities suggest the highest probabilistic asymmetry of the healthy young heart rates and highlight the facts that heart diseases and aging broke asymmetry, or reduce the nonlinear dynamical complexity , of human heartbeats .
After revision:  The temporal irreversibility researches on cardiac activities suggest the highest probabilistic asymmetry of the healthy young heart rates and highlight the facts that heart diseases and aging reduce the nonlinear dynamical complexity , of human heartbeats .