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This study aims to identify the values of the explosive power and the significance of some biochemical signs related to bone stiffness and to identify the evaluation of explosive power training in three consecutive time stages among young players handball in young players handball. The researcher hypothesized that there are statistically significant differences in the results of the follow-up measurements for the explosive power tests, and there are statistically significant differences in the three follow-up measurements for the biochemical inference tests related to bone solidness among young handball players.
The researcher adopted the descriptive, follow-up design. The study included 16 young handball players who were randomly selected from Al-Jaish Sport Club who participate in the first-class tournament for the 2017-2018 sport season. The study variables included the explosive power, calcium, magnesium, inorganic phosphorus, cholesterol, and blood sugar. These variables were tested three times; the interval between one test and another was one month. The statistical package for social sciences, version 24 for windows was used for data analyses. The study results revealed that the stability of the non-improvement of the explosive power is attributed to the stability of no decrease in cholesterol and blood sugar that are linked with bone solidness. Furthermore, the maximum training for explosive power exercises helped in increasing the storage of calcium, magnesium, and inorganic phosphorous. Additionally, the training of young handball players requires familiarity of the trainers with all the biochemical and nutritional knowledge in order to improve the output of the explosive power and they have to include these knowledges in planning their training for such knowledges. The researcher recommends that the biochemical indicators associated with bone solidness should be given an importance when directing the players to the proper nutrition of the building and not being satisfied with the nutritional directions in order to energy only, and the need for periodic measurements for such a nutrition.