SLOVAK JOURNAL OF SPORT SCIENCE 2021ARCHIVE OF ONLINE ISSUES » SLOVAK JOURNAL OF SPORT SCIENCE 2021 Editorial Martin Pupiš The significance of intra-abdominal pressure on postural stabilization: A low back pain case report Jakub Novak, Jakub Jacisko, Tereza Stverakova, David Juehring, Martin Sembera, Pavel Kolar, Alena Kobesova The influence of body height, body weight and body mass index on hand grip strengthHand grip strength Ratko Pavlovic, Borko Petrovic, Gojko Kozic , Jovana Ceho Organism response to load in swimming training Zuzana Pupišová, Vladimir Franek, Jaroslav Kompán The role of ssc cycle in hockey off-ice training Jozef Sýkora, Vladimir Franek, Roman Švantner Review: Statistical methods for evaluating information in sports sciences through SPSS software Ľudmila Jančoková The association between two categorical variables measured by chi-square statistic, w index and contungengy coefficient Erika Liptaková Anhtropometric characteristic of female junior national team volleyball players: a comparative study Fidanka Vasileva, Angjel Vasilev Gender differences in the level of interactions between the physical activity and quality of life of 10 years old children Monika Czaková, Jaroslav Broďani , Natália Dvořáčková The effects of walking on spinal mobility of the patient with lumbar syndromewalking and LBP Sinisa Nikolic, Nikolina Gerdijan, Goran Vasic, Marija Gajin Kresovic