Health Claims

Doing more than about four sets of a resistance exercise in one session, even when pushing to maximum effort, provides little extra muscle growth compared to doing four sets.

When the total amount of work done for the biceps and triceps is the same, doing one exercise per muscle group produces the same muscle growth as doing multiple exercises over eight weeks.

When the total number of sets is the same, adding blood flow restriction to low-intensity weight training does not lead to greater muscle growth than high-intensity weight training alone in healthy...

For young men who regularly lift weights, the number of sets taken to muscular failure may better predict muscle growth than the total weight lifted or the number of repetitions performed, as long as...

After resistance training, the thickening of the vastus lateralis muscle in young men is not the same along its length: the part closer to the knee grows more than the part closer to the hip.

In healthy young men, both intense weight training and intense weight training with restricted blood flow lead to measurable thickening of the connective tissue surrounding the thigh muscle,...

In healthy young men, two different types of weight training programs—high-intensity lifting and high-intensity lifting with blood flow restriction—produce similar increases in thigh muscle size...

Using elastic wraps to partially restrict blood flow during high-intensity weight training can lead to similar muscle growth as high-intensity weight training without wraps in healthy young men.

When people train to muscle failure using the same number of sets, they may gain similar muscle size even if one group lifts significantly more total weight, suggesting that how close sets are to...

When healthy young men perform knee extension exercises as part of resistance training, the thickening of the vastus lateralis muscle is greater in the lower part of the muscle than in the upper part.

In healthy young men, performing intense weight training with or without restricted blood flow to the leg leads to measurable thickening of the connective tissue surrounding the main thigh muscle...

In healthy young men, two different resistance training methods—training until muscle failure or using blood flow restriction with mixed intensities—produce similar increases in thigh muscle size...

For people who train casually, lifting lighter weights more times and lifting heavier weights fewer times produce similar muscle growth if the total work done is the same, but the heavier-weight...

Studies show mixed results on whether doing more resistance training sets leads to more muscle growth in people who already train regularly. Some findings suggest that increasing the number of sets...

When predicting how much muscle a person will gain from training, accounting for how much they have trained in the past leads to more accurate predictions.

For people who already regularly lift weights, doing more sets per week does not reliably lead to more muscle growth than doing fewer sets.

When people train with light effort and low fatigue using 80% of their maximum strength, their nerve signals to muscles become more frequent, but this does not change how those muscles are activated...

In adults who regularly lift weights, performing resistance exercises with either low or high effort close to failure for five weeks leads to about a 10% increase in maximum knee extension strength,...

After five weeks of strength training using either light or heavy effort levels, people show less stability in their muscle force during sustained, moderate-intensity contractions as they become...

When performing sustained muscle contractions at 30% of maximum strength, both low and high repetition resistance training lead to similar increases in electrical signals from motor units as the...

In adults who regularly lift weights, performing workouts close to failure or with some reserve in the last rep produces similar improvements in how long they can sustain effort, with no meaningful...

Men and women show different patterns of nerve signal rates in certain leg muscles during exercise, with women having higher rates in one muscle (vastus lateralis) at lower effort levels and men...

After six weeks of strength training, the nerve signals to the main thigh muscles do not become stronger in young people who have not trained before.

Electrical signals controlling muscle contraction are consistently stronger in the outer thigh muscle (vastus lateralis) than in the inner thigh muscle (vastus medialis), regardless of the intensity...