HoldsUp

Andy Galpin

Parker University

Andy Galpin is an exercise and performance scientist and a Professor of Kinesiology. He serves as the Executive Director of the Human Performance Center at Parker University and has held a professorship at California State University, Fullerton. His work focuses on human performance, exercise science, fat loss, and health optimization.

8 claims checked on air: 3 context 4 supported 1 unverified

What they said on air - supported

0:00:33supportedmoderateExercise Scientist Dismantles My Longevity Workout (Dr. Andy

Backward sled walking improves knee health and elevates core body temperature as a warm-up.

"from the warm-up perspective, the original warm-up you had, I think you had some backwards walking with your sled, and you did like three or four rounds of that, right? Great. That's going to check off the box with some knee health for sure. It is going to check off the box of a physical warm-up temperature-wise." (said at 0:00:33)

Evidence supports the biomechanical and clinical benefits of backward (retro) walking for knee health, as well as its utility as an active warm-up. A systematic review and meta-analysis of 13 randomized controlled trials demonstrated that backward walking exercises significantly reduce pain intensity and disability in individuals with knee osteoarthritis. Biomechanical studies also demonstrate that backward walking reduces the external knee adduction moment (a key metric of medial knee joint loading) while increasing quadriceps activation. As with any moderate-to-vigorous active movement, backward sled walking generates metabolic heat and raises body temperature during a warm-up.

0:35:31supportedmoderateExercise Scientist Dismantles My Longevity Workout (Dr. Andy

Prior conditioning with a heavy load primes fast-twitch muscle fibers and enhances subsequent explosive movement velocity through post-activation potentiation.

"That sled is going to potentiate this jump. So what that means is fast-twitch muscle fibers only turn on with higher force production. Light, fast isn't high force. You turn them on with a heavier load there, then come back and do a lighter load, and this thing will fly faster than it did before. Post-activation potentiation is the physiological phenomenon." (said at 0:35:31)

Post-activation potentiation (PAP) and post-activation performance enhancement (PAPE) refer to the acute enhancement of muscular force, velocity, and power output following a heavy or near-maximal conditioning contraction. The underlying physiological mechanisms include the phosphorylation of myosin regulatory light chains and the preferential recruitment of higher-order (fast-twitch / type II) motor units. Systematic reviews and meta-analyses confirm that conditioning activities (such as heavy squats or bench presses) acutely enhance subsequent explosive performance (e.g., jump height, ballistic throw velocity, and sprint performance), provided adequate rest intervals (typically 4–8 minutes) allow fatigue to dissipate while potentiation remains elevated.

0:46:00supportedmoderateExercise Scientist Dismantles My Longevity Workout (Dr. Andy

Stretching between resistance training sets reduces power and strength output on subsequent efforts.

"Now, if you look at the research, stretching in between sets will reduce power and strength output. It's pretty well established at this point, but you're not optimizing for strength." (said at 0:46:00)

Agonist static stretching performed during inter-set rest intervals acutely impairs subsequent muscular performance, reducing total work capacity, total volume load, and electromyographic activity compared to passive rest. However, this decrement applies primarily to stretching the agonist (working) muscle; stretching antagonist muscles between sets does not produce the same performance impairment and may occasionally enhance agonist repetition output.

1:02:10supportedmoderateExercise Scientist Dismantles My Longevity Workout (Dr. Andy

Performing seated calf raises with bent knees largely disengages the gastrocnemius because it crosses the knee joint, thereby isolating the soleus muscle.

"seated calf raises are fine. They are—because your knee joint is bent and the gastrox crosses the knee joint, the gastrox goes away. Most of your day is dealt with the soleus, dealt with the soleus anyways. That's fine, but this is a soleus isolator." (said at 1:02:10)

Biomechanical, electromyographic, MRI, and longitudinal training studies confirm that flexing the knee to approximately 90 degrees during plantar flexion (seated calf raise) significantly decreases gastrocnemius muscle recruitment and hypertrophy due to active insufficiency from shortening across the knee joint, shifting the primary mechanical demand to the monoarticular soleus.

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