Health Claims

Chemical compounds formed in the body after eating red meat are structurally different from those known to damage DNA and cause tumors in lab studies, suggesting they do not cause cancer in the same...

Studies in animals that suggest heme iron causes colorectal cancer use diets with much higher heme iron, lower calcium, and more fat than people typically consume in red meat. These conditions do not...

Current scientific studies using laboratory models and animal diets with very high levels of heme iron, along with human observations of certain iron compounds, have not shown that normal amounts of...

When lifting weights until complete exhaustion, the total number of repetitions performed across all sets is lower than when stopping one repetition before failure, because fatigue reduces...

As exercise becomes harder and closer to physical limits, people report higher levels of discomfort, tiredness, muscle soreness, and slower recovery, showing that how fatigued someone feels...

When lifting weights and stopping 3 reps before failure, there is less reduction in muscle strength 24 hours later compared to lifting until complete exhaustion or stopping only 1 rep before failure.

When men and women who regularly lift weights perform bench presses until they can't complete another rep, men show 29% more short-term muscle fatigue than women. However, when they stop short of...

For trained lifters, pushing bench press sets until complete muscle fatigue results in a 25% larger drop in bar speed four minutes after the set compared to stopping three reps before failure,...

For women who already train regularly, doing more resistance training each week does not lead to a measurable increase in the thickness of the outer thigh muscles after 12 weeks, even though other...

For women who already train regularly, increasing leg workouts from 22 to 34 sets per week for 12 weeks does not lead to greater strength gains in the leg press compared to 22 sets, suggesting that...

Over 12 weeks, adding more sets to weekly resistance training sessions leads to larger gains in leg strength and muscle size in the vastus lateralis of trained women, but does not significantly...

Surface electromyography can measure and distinguish the highest levels of muscle activity in the biceps and triceps when performing exercises like concentration curls and kickbacks in healthy young...

During resistance exercises like concentration curls and kickbacks, the biceps muscle consistently shows higher levels of electrical activity than the triceps, regardless of whether it is the main...

In resistance exercises, the biceps muscle shows greater electrical activity than the triceps muscle, whether it is doing the main work or opposing the movement, in healthy young adults aged 20–30.

During weightlifting, the biceps muscle often shows higher electrical activity than the triceps, even when the biceps is not the primary mover, suggesting that the specific exercise being performed...

When performing resistance exercises, the biceps muscle shows greater electrical activity than the triceps muscle, whether it is the main muscle moving the weight or the one resisting the movement,...

Doing multiple different exercises with higher volume does not lead to noticeably more muscle growth than doing just one exercise four times per week.

Doing five or six sets of strength exercises instead of four, when pushing close to muscle failure, does not lead to meaningfully more muscle growth.

If you add an isolation exercise for the arms to a compound exercise without keeping the total amount of training the same, the extra muscle growth is very small.

Doing more than a basic set of arm exercises and using more than one type of movement does not lead to noticeably greater muscle growth compared to a minimal routine.

When lifting weights until exhaustion with only one minute of rest between sets, doing more than four sets provides little extra benefit in terms of muscle stress or tension because the body becomes...

When people train a muscle group more frequently—increasing from 8 to 12 sets per week—they gain about 0.9% more muscle mass, according to a review of multiple studies.

Compound exercises, such as bench presses or pull-ups, do not activate the long head of the triceps as much as isolation exercises, and they do not create as much muscle tension throughout the full...

Multi-joint exercises that engage both the biceps and triceps add a significant amount to the overall workload these muscles experience during a workout.