Thanks for the advice.
I read the article on fast/slow twitch muscles. This is no doubt an advanced subject. I haven't bought into the idea of training differently based on muscle type. If one is training for strength and size, it doesn't make sense to attempt this by concentrating on fatiguing the slow twitch, at the expense of the fast twitch, regardless of your own muscle composition. The fast twitch that you do have will respond and bring whatever strength and size your genetics will allow.
As far as my original question about reps for beginners, I came across several references to the most recent ACSM guidelines, which may not be published yet. This has put my mind at ease, and meshes nicely with your advice to learn what works for me.
Here's the excerpts from the Guidelines, with the portions in bold that directly address my question. From http://www.naturalstrength.com/feedback ... cleID=1264
In a shift from its prior position stand statement about progressive resistance training for experienced trainees1, the American College of Sports Medicine (ACSM) in its 7th edition of its Guidelines for Exercise Testing and Prescription2, now endorses much simpler training programs as effective for both beginners and experienced trainees.
A majority of the recommendations from the Guidelines book were presented at the recent ACSM national convention without disagreement.
Here are some of the points and recommendations from the new guidelines that you can effectively use for your own training.
Perceived effort is a good measure of intensity. Rather than focusing on protocols that use different percentages of 1 RM, focus on perceived effort. Using different percentages of 1 RM is not a good way to prescribe exercise programs.
This is because across individuals, and different muscle groups, and different exercises, the same percentage of a 1 RM can yield a different number of repetitions. Such differences can exist within an individual. This means that for some people and for any exercise an individual performs, the prescription can be too hard or too easy, rendering it ineffective.
Different repetitions and resistance can yield the same degree of effort when the maximum repetitions are performed in a set. This means that a wide range of repetitions for a set can be equally effective.
For example, a very high degree of effort and intensity can be reached in a set where you perform six repetitions in good form with a heavy resistance and ‘fail’ on an attempt at a seventh repetition or where you perform 12 repetitions with a more moderate weight and ‘fail’ on an attempt at a 13th repetition.
In either case, the maximum recruitment of muscle fiber motor units would have occurred. You can choose to train with any number of repetitions with an effective set taking between about 30 seconds and 90 seconds.
There is no evidence that there is a separate way to train for strength or endurance. As you become stronger, you will increase your absolute muscular endurance. For example, if through training, you increase your strength in a movement from 60 lbs to 85 lbs, you may increase the number of repetitions you can perform with 40 lbs from 12 to 20. No special training is required to increase endurance.
For each person and for each exercise and muscle group, relative muscular endurance is stable and appears genetically based. For example, a beginner’s 1 RM on an exercise may be 100 lbs and the trainee can perform 8 repetitions with 80 lbs (80%).
Two years later, the trainee can do a 1 RM with 200 lbs and perform 8 repetitions with 160 lbs (80%). Relative endurance using a percent of 1 RM hasn’t changed and evidence indicates that it will not change. Protocols assuming that the relationship can be changed are not based on scientific research.
Based on raising a resistance in about 3 seconds and lowering the resistance in 3 seconds, performing several to 15 repetitions can be effectively used. If longer duration repetitions are performed such as using a 5, 5 (10 seconds for 1 repetition) then several to 8 to 10 repetitions can be used.
Increasing bone mineral density may depend upon using somewhat lower repetitions such as 6-8 and therefore training with somewhat greater resistance. A variety of exercises can be used because the effect of resistance training on bone mineral density is site specific.
To increase strength, training has to produce an overload beyond a minimal threshold. Maximum effort produces maximum intensity and the greatest stimulus but the maximum stimulus may not produce any greater adaptation than a somewhat submaximal effort if there is some marginal overload. This means you should focus on progression while using great form and not an absolute maximum effort where form may be compromised.
Train through as complete a range of motion that is comfortable for you.
Assuming all the other variables are kept constant, the intensity of training can be increased by increasing the weight, number of repetitions, and by reducing momentum through increasing the repetition’s duration. Muscular tension for an exercise may be maintained and intensity increased by not ‘locking-out’ on multiple joint exercises such as squats and bench press.
There is no evidence that any one exercise is better than any other exercise for a specific muscle group. There is no evidence that performing an exercise a specific way such as on a stability ball produces better outcomes for strength or endurance than if the exercise is performed in another way. The exercises are simply different.
A variety of exercises can be used for each muscle group and can perhaps provide some physiological and psychological benefits beyond consistently performing the same exercise for a muscle group. However, a variety of exercises for each muscle group need not be performed in one training session but rather across training sessions.
While a few researchers have shown better outcomes for strength and muscular hypertrophy with multiple set protocols, the overall evidence does not support the performance of multiple sets of each exercise or higher volume training.
A guideline is to take about 3 seconds to raise the resistance and about 3 seconds to lower the resistance using a full range of motion for each repetition. Longer duration repetitions may decrease momentum and increase intensity.
There is not any consistent evidence that the stimulus (repetition performance, number, duration, volume of training) for experienced trainees needs to be different than for beginning trainees. Therefore, there is little or no basis for special ‘advanced’ routines promoted by some organizations, websites, and magazines.
A program for any trainee can consist of eight to 10 exercises performed two to three days per week. Different exercises for each muscle group could be varied across workouts. For example, a squat can be used for the thighs in the first workout in a week and the leg press can be used in the second workout.
Training should be on two or three nonconsecutive days in the week.
Rather than the time consuming and complex guidelines and protocols that were recommended from the ACSM’s prior position stand and other organizations, the current state of the science recommends a far more efficient approach to training. Efficient and simpler training programs also are likely to result in greater adherence and more consistent training. In that way, the new guidelines should also produce better outcomes.
More details about these guidelines and simple training routines based on these guidelines will be in the August Master Trainer. Here is one starting point. An effective routine can consist of a compound and isolation movement for one set each for larger muscle groups and one exercise for one set for smaller muscle groups.
American College of Sports Medicine. Position Stand: Progression models in resistance training for healthy adults. Medicine and Science in Sports and Exercise. 2002; 34: 364-80.
ACSM. (2005). ACSM's Guidelines for Exercise Testing and Prescription (7th ed.). Baltimore, MD: Williams & Wilkins