Sport requires building your body in the best possible shape to effectively use its abilities for the specific activities. In that regards, health science is very important for professional sportsmen to prevent injuries and numerous issues related to muscles and diet, required to maintain healthy balance and optimize performance of the sportsmen. By applying the knowledge acquired about human’s body by health science through series of experiments and historical data, sportsmen can optimize their diet and at the same time avoid any negative effects of excluding certain ingredients from their daily ration (Peat 2001, p. 15).
For nonexperimental data, causal direction can often be inferred if information about time is available. This is because (according to many, though not all, theories) causes must precede their effects temporally. This can be determined by statistical time series models, for instance, or with a statistical test based on the idea of Granger causality , or by direct experimental manipulation. The use of temporal data can permit statistical tests of a pre-existing theory of causal direction. For instance, our degree of confidence in the direction and nature of causality is much greater when supported by cross-correlations , ARIMA models, or cross-spectral analysis using vector time series data than by cross-sectional data .
Smoking during pregnancy causes certain complications such as detachment of placenta, bleeding, and premature birth. It produces effects not only on mother but also newly-born baby along with increased chances of abortion. Studies have shown that, in case of pregnant women, nicotine has more grave effects compared with heroine or similar drugs. Nicotine in smoking effects newly-born baby because blood is directly sent to the placenta through arteries and spans resulting from it can reduce the amount of oxygen received by the baby. Resultantly, chances of low-birth rate are more. Moreover, premature delivery can eventually lead to disastrous health conditions of both mother and baby, for example, cerebral palsy, metal retardation, and in some cases death.