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The purpose of this study was to verify the effect of a 12-weeks linear (LP) and biweekly non-linear (BWNLP) periodized resistance training program with equated volume and intensity on maximal strength and vertical jump (VJ) for volleyball players. Sixteen volleyball players of Tanta club with minimum 1-year strength training experience were divided into two groups: (LP, n = 8 and BWNLP, n = 8). They trained 4 days/ week in non-consecutive days using split routine. One repetition maximum (1RM) was measured during half squat, bench press, laying leg curl, seated arm curl, seated leg extension, and seated arm extension before training program (Pre), after 4 weeks of training (Mid-1), after 8 weeks of training (Mid-2), and after 12 weeks (Post). The results have shown statistically significant increase (p ≤ 0.05) in all exercises at MID-1, MID-2 and POST compared with PRE, for both LP and BWNLP models, statistically significant differences favor BWNLP (p ≤ 0.05) at POST for 4 exercises in comparison with the LP, and statistically significant differences favor BWNLP (p ≤ 0.05) at MID-2 for 2 exercises in comparison with the LP. No statistically significant differences (p > 0.05) between LP and BWNLP in maximal strength at MID-1. No statistically significant differences (p > 0.05) between LP and BWNLP models in the MID-1, MID-2, and PRE evaluation for VJ test. In conclusion, the BWNLP model outperformed the LP model making larger improvements in maximal strength, and a little higher percentage increase in VJ than LP model Key words: Training, periodization, muscular strength

The Effect of Linear and Biweekly Non-Linear Periodized Resistance Training on Maximal Strength and Vertical Jump for Volleyball Players