Early adaptations to six weeks of non-periodized and periodized strength training regimens in recreational males

This study compared quadriceps muscle cross-sectional area (csa) and maximum strength (1rm) after three different shortterm strength training (st) regimens (i.e. non-periodized [np],traditional-periodization [tp],and undulating-periodization [up]) matched for volume load in previously untrained individuals. thirty-one recreationally active males were randomly divided into four groups: np: n = 9; tp: n = 9; up: n = 8 and control group (c): n = 5. experimental groups underwent a 6-week program consisting of two training sessions per week. muscle strength was assessed at baseline and after the training period. dominant leg quadriceps csa was obtained through magnetic resonance imaging (mri) at baseline and 48h after the last training session. results: the 1rm increased from pre to post only in the np and up groups (np = 17.0 %,p = 0.002; up = 12.9 %,p = 0.03),respectively. there were no significant differences in 1rm for lp and c groups after 6 weeks (tp = 7.7 %,p = 0.58,c = 1.2 %,p = 1.00). the csa increased from pre to post in all of the experimental groups (np = 5.1 %,p = 0.0001; tp = 4.6 %,p = 0.001; up = 5.2 %,p = 0.0001),with no changes observed in the c group (p = 0.93). conclusion: our results suggest that different st periodization regimens over a short-term (i.e. 6 weeks),volume load equated conditions seem to induce similar hypertrophic responses regardless of the loading scheme employed. in addition,for those recreational males who need to develop muscle strength in the short-term,the training regimen should be designed properly. © journal of sports science and medicine.