In 1999 I wrote, published and claimed copyright on this concept (bolding added now):
Most train hard and long, and with high frequency. Unless one is supported by a incredibly higher recovery system (natural or chemically enhanced), this approach will result in over-training and non-achievement of goals.
....I have very firm beliefs on this topic. Volume and intensity are inversely related. When one is up, the other is forced down. You cannot do a high volume workout (i.e. a high number of sets) and have as high an intensity as you would have with a lower number of sets. Many kid themselves on this, but you cannot avoid reality.
I was conducting research and I came upon the following exercise in a publication copyright claimed by another 'author' at a subsequent date (bolding added):
…but you cannot train hard and long. I agree with this statement. Volume and intensity are inversely related. When one is up, the other is down. Most trainers, quite honestly, seem unaware of this simple concept, or are perhaps in denial as regards this, but it is an irrefutable fact.
And I said to myself: “That looks familiar!” So I cross-referenced it and I said to myself: “Wow! No wonder that looked familiar!”
And I came upon this wording another one more times by the same 'author' in different publications - in the absence of credits or references to the origin or permission to use from the original author (myself), and that the 'author' claimed copyright....