Barnekow-Bergkvist, M., Hedberg, G., Janlert, U., & Jansson, E. (1988). Prediction of physical fitness and physical activity level in adulthood by physical performance and physical activity in adolescence-an 18-year follow-up study. Scandinavian Journal of Medicine & Science in Sports, 8, 299-308. doi:10.1111/j.1600-0838.1998.tb00486.x
 Iwai, K., Matuki, M., Koshida, S., Tanaka, K., Miyashita, K., & Urabe, Y. (2008). Association between progression of underweight and overweight status and physical fitness improvements in the youth: A one-year follow-up study. The Japanese Society of Physical Fitness and Sport Medicine, 57, 491-502. doi:10.7600/jspfsm.57.491
 Katherine, F. M., Margaret, C. D., Brian, K. K., & Cynthia, O. L. (2012). Prevalence of obesity and trends in the distribution of body mass index among US adults, 1999-2010. JAMA, 307, 491-497. doi:10.1001/jama.2012.39
 Kim, R. H., Matsuura, Y., Tanaka, K., & Inagaki, A. (1933). Physical fitness and motor ability in obese girls aged 12 to 14 years. The Japanese Society of Physical Fitness and Sport Medicine, 42, 380-388.
 Mikkelsson, L., Kaprio, J., Kautiainen, H., Kujala, U., Mikkelsson, M., & Nupponen, H. (2006). School fitness tests as predictors of adult health-related fitness. American Journal of Human Biology, 18, 342-349. doi:10.1002/ajhb.20498
 Shimada, S., Demura S., & Yamada T. (2010). Characteristics of life style and health-status based on longitudinal data for three years of Japanese male students in the national college of technology. The Journal of Education and Health Science, 55, 293-304.