Squaggleboggin said:
Do you really think a single set of 8 repetitions is enough of a warm up though? I mean if it is, then I'd rather do that, but something tells me it's not. Perhaps if I do even more of a warm up, then I can lift even more weight (going from no warm up to the warm up I currently do significantly improved my lifts). Let me know what your thoughts are on warming up as far as how many sets and reps should be done and at what weight relative to the working set.
I am going to speak from my own experience, which people may agree or disagree with. When I started lifting again six years ago, I experimented for several months with various programs. What I found worked for me was light, low intensity warm ups. Again my muscles are cold. Even with a light weight, I found the muscle fatigued very quickly, especially during the first warm up set of a bodypart. The example I gave earlier of 25 pounds for DB bench presses. At 7 or 8 reps, I start to feel a little bit of a burn. As soon as I feel that, I STOP. The intent is to warm the muscle up, not fatigue it, so why do I want to reach that point? The second set with a slightly higher weight, the muscle is a bit warmer. It can handle the higher weight, but again it may start to fatigue at 7, 8, 9 or 10 reps. Whatever it is, when I feel fatigue beginning, I stop again. Now the muscle is warm and I then increase the weight again and I am ready to start my working sets where I work now past the fatigue point.
When I am not training heavy to the max, I may only use one warm up set as I said on the second, third or fourth exercise for a muscle. I go by feel. And sometimes on later exercises, I may go right to working sets if I am doing high volume day where I am not approaching failure and thus using lighter weights on the acclimation and working sets than when I am doing a lower volume, heavy weight day.
I would advise you to try something like this and then compare it to how you feel and how much weight you lift on your last "money" sets and see what is best for you. I found out at the beginning six years ago that my "money" set reps and weights were better using these types of warm ups than if I started heavier. My opinion is that since my muscles got a proper warm up and also were not being too fatigued on the earlier sets, I was able to lift with better results on the sets that really counted.
One other thing also comes to mind on warm ups. They also give me a guage for how good ( or not good) I feel on a certain day. Some days we are full of energy. Other days, we may not be. I also have a three year old rotator cuff injury that still bothers me from time to time. On my warm ups for upper body parts like chest, shoulders and tris, I can get a feel for how shoulder is that day and this can determine how far I can press my limits that day. A couple of weeks ago, I worked shoulders hard on Saturday and when I was warming up on tris the next day, the cuff was very weak and sore. Thus, I knew I had to back off a bit and also should not do close grip bench presses that day as they would have put too much strain on the cuff. If I had gone right to heavy working sets, I may not have realized this and also could have risked an injury. The next week, there was no problem with the shoulder in warm ups and I felt really strong. So I did close grip benches, piled on the weight and made a new high that day.
On the subject of how much weight to use on warm ups and percentages, I do not use percentages. From trial and error, I know what weights to use to get to that "its starting to burn a little" at 8 reps and its all in my training logs which I refer to before I begin the exercise. My two warm up sets for squats are 85 and 115 ( 135 which I see alot of guys doing is too much for me with cold quads) and my acclimation sets are anywhere from 155 ( 15 reps) to 185( 8 reps) depending on the number of reps and my rest periods between sets on that particular day. My max squat which I pyramid up to on my last set right now at 8 reps with a 3 minute rest is 350.
Anyway, this is how I do it and what works for me.