单选题
Young adults who are fit have a higher IQ and are more likely to go on to university, reveals a major new study (51) out at the Sahlgrenska Academy and Sahlgrenska University Hospital.
The results were recently published in the Proceedings of the National Academy of Sciences (PNAS). The study (52) 1.2 million Swedish men doing military service who were horn between 1950 and 1976. The research group analyzed the (53) of both physical and IQ tests the youngsters took right after they started serving the army.
The study shows a clear link (54) good physical fitness and ]wrier results for the IQ lest. The strongest links are for (55) thinking and verbal comprehension. But it is only fitness that plays a (56) in the results for the IQ lest. and not strength. "Being fit means that you also have good heart and lung (57) and that your brain gets plenty of oxygen." says Michael Nilsson, professor at the Sahlgrenska Academy and chief physician at the Sahlgrenska University Hospital. "This may be one of the reasons why we can see a clear link with fitness, but not with muscular (58) . We are also seeing that there are growth factors that are important.
By analyzing data for twins, the researchers have been (59) to determine that it is primarily environmental factors and not genes that (60) the link between fitness and a higher IQ.
"We have also shown that those youngsters who (61) their physical fitness between the ages of 15 and 18 increase their performance, "says Maria. Aberg, researcher at The Sahlgrenska Academy and physician at Ahy health centre. "This being the case, physical education is a (62) that has an important place in schools, and is an absolute must (63) we want to do well in maths and other theoretical subjects. "
The researchers have also compared the results from fitness tests during national service (64) the socioeconomic status of the men later in life. Those who were fit at 18 were more (65) to go into higher education, and many secured more qualified jobs.