A higher number of repetitions may affect predictiveness in a submaximal 1RM test by decreasing what?

In the context of a submaximal one-repetition maximum (1RM) test, the predictiveness of the test refers to its accuracy in estimating an individual’s true maximal strength based on performance at submaximal levels. When a higher number of repetitions is performed during a testing session, it can lead to a decrease in validity.

Validity is essentially the degree to which a test measures what it claims to measure, which in this case is the ability to predict an individual's maximal strength from submaximal efforts. As the repetitions increase, fatigue may accumulate, leading to a compromised performance that does not accurately reflect the individual's true strength capabilities. If the test becomes too fatigued and does not accurately signal the individual’s maximal potential, the validity of the estimates derived from that test is diminished. Hence, a higher number of repetitions can negatively impact the validity of the predictions made from the submaximal 1RM test.

In practice, it's crucial for fitness professionals to balance the number of repetitions during such assessments to maintain the validity of the predicted values.