Effectiveness of Different Kinds of Strength Training Periodization

Periodization of strength training entails changing over time the weight handled in each exercise along with the number of repetitions per set. When the weight used is higher, the number of repetitions is lower and when the weight used is lower, the number of repetitions is higher. It is widely agreed among strength and conditioning professionals that periodized strength training is more effective than non-periodized training.

There are various versions of strength training periodization, including:

• Traditional periodization - The trainee starts with relative light weights and high repetitions, and over a period of several weeks, increases the amount of weight lifted while decreasing the number of repetitions. For example, the trainee might begin by doing 10 repetitions per set with 60% of the maximum weight that can be lifted for a single repetition and progress to 4 repetitions with 80% of the max weight.
• Daily Undulating Periodization - On different days, the trainee uses a different combination of weights and repetitions. A sample schedule might be medium weight and medium reps on Monday, light weight and high reps on Wednesday, and heavy weight and low reps on Friday.
• Weekly Undulating Periodization - Weight and reps fluctuate from week to week. A sample schedule might be low weight and high reps on week 1, medium weight and medium reps on week 2, and high weight and low reps on week 3, with this 3-week pattern repeating several times.

A recent study by Apel, Lacey, and Kell in the Journal of Strength and Conditioning Research (vol. 25, no. 3, pp. 694-703, 2011) sought to determine the relative effectiveness of traditional vs. weekly undulating periodization.

Experimental Procedure
Forty-two young, physically active men were divided into three groups of 14 that trained for 12 weeks as follows:

• Control group - Performed no strength training
• Traditional periodization (TP) - Increased the resistance in a fairly linear manner from 57% of max the first week to 80% of max the final week.
• Weekly Undulating Periodization (WUP) - Started at 57% of max, but increased resistance over 3 weeks before reducing weight close to where it started and increasing it back again over 3 weeks. This was done over 3 cycles in which both the starting and ending weight for each 3-week cycle became greater than for the previous 3-week cycle, ending at 78% of max.

There were 15 different exercises selected to work the entire body. The exercises used, rest time, total exercise volume and average percent of maximum weight used were the same in both groups. There were 3 training sessions per week for the first 2 weeks and 4 per week for the remaining weeks, in which half the exercises were performed 2 days per week (e.g. Mon. and Thu.) and the other half on 2 other days per week (e.g. Tue. and Fri).

Results

• Both periodized training groups increased significantly in strength, while the control group did not.
• Increases in back squat strength were significantly greater for the TP group (54%) than for the WUP group (34%).
• Increases in bench press strength were significantly greater for the TP group (24%) than for the WUP group (19%).
• Increases in pull-down strength were significantly greater for the TP group (29%) than for the WUP group (19%).
• Increases in dumbbell shoulder press strength were significantly greater for the TP group (48%) than for the WUP group (36%).
• Increases in leg extension strength were greater for the TP group (39%) than for the WUP group (27%), although the between-group difference did not reach statistical significance.
• There was more muscle soreness and fatigue reported among the WUD group, which may have hindered training progress.

Bottom Line
For this group of recreationally active males, traditional periodization produced superior results to weekly undulating periodization. The between-group differences were great enough to be meaningful.

Comparing weight training periodization programs

Weight training periodization has been widely recognized by strength and conditioning coaches to be a more effective means of increasing strength than staying with the same combination of repetitions and resistance over an extended period of time. Periodization basically involves making programmed changes from time to time in the number of repetitions performed in each exercise set, along with an increase in barbell weight as repetitions are decreased, and a decrease in barbell weight as repetitions are increased.

Periodization may be of the linear variety, by which the athlete makes progressive changes in the weight/rep combination during every training block of 1 or more weeks. For example the athlete may do 10 reps with a lighter weight for 2 weeks, then 8 reps with increased weight for 2 weeks, then 6 reps with more weight for 2 weeks, followed by 4 reps with even more weight for 2 weeks. A single repetition max lift may then be attempted before returning to the 10-rep scheme. This cycle may be repeated over an extended time period. The athlete generally gets stronger between cycles so that the weight at all repetitions is adjusted upwards, resulting in a continued increase in strength. Even more complex periodization models have been developed by strength coaches. For example, in daily undulating periodization, the athlete may change the repetition/weight scheme within a single week, with other changes occurring over more extended time periods.

A recent article in the Journal of Strength and Conditioning Research (Vol 23, no 9, pp 2437-2442, 2009) entitled, “Comparison between linear and daily undulating periodized resistance training to increase strength” by Prestes et al., compared these two regimens using 3 sets per exercise 4 times per week with 20 subjects in each training group. The linear program used 12, 10, 8, and 6 reps for a week each, repeating the entire cycle 3 times for a total of 12 weeks. The daily undulating program used 12 reps for half a week, 10 reps for the second half-week, 8 reps for the first half of the following week, and 6 reps for the second half-week. This pattern was repeated 6 times for a total of 12 weeks.

Although the results did not reach statistical significance because of individual differences in training response, the average increases in isometric strength (bench press, leg press, and arm curl) were considerably greater for the daily undulating periodization group than for the linear periodization group. This supports previous research showing the effectiveness of daily undulating periodization programs.