Video summary

What Is the Best Tempo For Building Muscle? (SCIENCE BACKED)

Main summary

Key takeaways

Science and Nature

Scientific concepts, discoveries, and nature/physiology phenomena presented

Tempo myth vs. evidence (muscle hypertrophy)

  • Common bodybuilding claim: To build more muscle, perform every repetition slow and controlled, increasing time under tension (e.g., slow eccentric with a specific count like “3 seconds down, 1 second up”).

  • Core corrective idea from research: Muscle growth responds more to mechanical tension (and the overall effective training stimulus) than to simply counting seconds.

  • Key research finding (review by Schoenfeld et al.):

    • When rep duration stays within a practical range (approximately 0.5 to 8 seconds per repetition), muscle growth is broadly similar across tempos.
    • Hypertrophy declines mainly when reps become extra slow, likely because this tends to force:
      • lighter loads
      • fewer quality reps
      • reduced overall stimulus

  • Key research finding (study by Wilk et al., eccentric tempo focus):

    • Deliberately slowing the eccentric phase (lowering portion) yields very little difference in hypertrophy across eccentric durations.

  • Key research finding (review by Robinson et al.):

    • Changing tempo within practical lifting speeds does not meaningfully improve hypertrophy.
    • Better predictors of hypertrophy:
      • training close to failure
      • accumulating sufficient quality volume
      • progressive overload / getting progressively stronger
      • not necessarily using an exact eccentric duration (e.g., “3 seconds” vs “5–6 seconds”)

Tempo and strength (performance specificity)

  • Systematic review/meta-analysis (Davies et al.):

    • Unlike hypertrophy, strength adaptations can be influenced by tempo, especially because strength is highly specific to the movement conditions practiced.

  • Specificity principle described:

    • Practicing lifting explosively improves explosive force production.
    • Practicing slower reps can improve force production at slower movement velocities.

  • Mechanistic framing: Strength involves skill/nervous system adaptation (more efficient force production under repeatedly practiced conditions), not only muscle size.

Why slow eccentrics feel effective (but may not be hypertrophy-optimal)

Slow eccentrics are often described as:

  • harder
  • associated with burn, pump, discomfort
  • sometimes leading to more soreness

However, the video emphasizes a distinction:

“Feeling harder” ≠ “stimulating more muscle.”

Practical methodology/tools for using tempo (as stated in the video)

Tempo is presented as useful, mainly for these roles:

  • Technique teaching tool

    • Example guideline: “3 seconds down, 1 second up” helps beginners stop “dive bombing” or bouncing.

  • Pause variations to improve positioning

    • Examples: pause squats, pause bench, pause RDLs
    • Also: floating deadlift with a pause just above the ground (about 2 seconds)
    • Rationale given: pauses reveal instability/poor technique; they help positioning (not magic hypertrophy).

  • Safety/control

    • “Controlled eccentric” to prevent gravity from dropping loads.
    • Particularly emphasized for: Romanian deadlifts, hack squats, back squats, split squats, dumbbell presses
    • Claim: reducing uncontrolled eccentric stress helps shift tension toward muscles rather than connective tissues.

  • Intensity techniques that extend tension within a rep

    • 1 + 1¼ reps (as described):
      • perform a full rep, then repeat a quarter of the rep (a “quarter rep” twice; per description: come up a quarter, then down again, then stand fully up)
      • purpose: alters where tension occurs during the rep
    • Charles Poliquin’s tempo contrast method:
      • use different tempos within the same set to add variety and stimulus so clients adapt and stay engaged.

Final recommendations (as stated)

  • For hypertrophy:

    • Control the eccentric (avoid letting gravity take over), but don’t turn every rep into an extremely slow tempo.
    • Use explosive intent on the concentric (lift “fast” even if the eccentric is controlled).

  • For beginners:

    • a simple tempo (e.g., 3 seconds lowering) can help learn technique, but they shouldn’t need to count forever.

  • General training advice:

    • train hard, work near failure, progress over time, and recover well—tempo is not the primary driver of muscle growth.

Researchers or sources featured (named)

  • Brad Schoenfeld (and colleagues) — review on tempo and hypertrophy
  • Wilk (and colleagues) — eccentric tempo study
  • Robinson (and colleagues) — review on tempo evidence for hypertrophy
  • Davies (and colleagues) — systematic review/meta-analysis on tempo and strength/dynamic strength
  • Charles Poliquin — “tempo contrast” method (cited as the originator of the technique)

Other named individuals/brands in the video

  • Brock Ashby (speaker)
  • Team Bro Gainsby / “I have Built by Bro” (creator/program; not a scientific source)

Original video