How do you incorporate sprints into your workout routine?
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@sphenoid I think if done properly they concentric. I think most people are unable to sprint because their movement patterns and compensations make sprinting stressful.
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@periander345 Yes sprints are for just piquing your nervous system and motor units, they don’t need as much of a stimulus as many people think. Doing long sprints, especially multiple, will end up being catabolic. If you do very very short sprints they end up feeling really good, while longer sprints just completely destroy you.
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@thebodyelectric_ Any running will end up being eccentric by nature, the faster you go the more deceleration required with each step. That’s why I do the micro sprints where I’m focusing on the initial acceleration which is more concentric while avoiding too much of the eccentric that occurs while up to speed. Bad form will make it infinitely worse though so most people may not benefit from sprints altogether.
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@sphenoid I'm not following the bit about deceleration required with each step. Are you talking about when slowing down? I think all of these issues are context dependent and sprinting and moving reflexively is generative given the right context. Most people just can't do it reflexively and strain when they run.
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@thebodyelectric_ The quadriceps and hamstrings work eccentrically during running to provide control, if not you would crumple to the ground after propelling yourself forward and trying to plant with the opposite leg. This is not an issue when you have good mechanics, which most people don't unfortunately or when you are mindful not to abuse it. Otherwise yes sprinting is profoundly stimulating to the system.
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I think that is a mischaracterization and have noticed it in the literature as well. Lengthening through reciprocal inhibition, what happens when someone sprints well, is different than an eccentric contraction. See Peat's comments on eccentric contractions: The brain’s role in protecting against injury by stress, when it sees a course of action, has a parallel in the differences between concentric (positive, muscle shortening) and eccentric (negative, lengthening under tension) exercise, and also with the differences between innervated and denervated muscles. In eccentric exercise and denervation, less oxygen is used and less carbon dioxide is produced, while lactic acid increases, displacing carbon dioxide, and more fat is oxidized. Prolonged stress similarly decreases carbon dioxide and increases lactate, while increasing the use of fat.”
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@thebodyelectric_ What are your thoughts on isometric contraction? Is it similarly stressful as eccentric contraction or is it a middle ground between concentric and eccentric?
She Peat on my noosphere till I generate energy.
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@thebodyelectric_ There's definitely negative work that goes on during running, especially in the hamstrings, that's one of the reasons for hamstring injuries from sprinting and a huge determining factor in sprint speed is the ability to maintain hamstring stiffness and absorb energy. I guess it would be closer to an isometric but it is still stressful. Damage is usually a result of metabolic issues and is dictated by the oxidative capacity of the muscle, meaning that stress such as longer durations of sprinting this would increase.
Schache, A. G., Brown, N. A., & Pandy, M. G. (2015). Modulation of work and power by the human lower-limb joints with increasing steady-state locomotion speed. The Journal of experimental biology, 218(Pt 15), 2472–2481. https://doi.org/10.1242/jeb.119156
Schache, A. G., Blanch, P. D., Dorn, T. W., Brown, N. A., Rosemond, D., & Pandy, M. G. (2011). Effect of running speed on lower limb joint kinetics. Medicine and science in sports and exercise, 43(7), 1260–1271. https://doi.org/10.1249/MSS.0b013e3182084929 -
@CheesedToPeatYou I don't think isometrics are stressful hardly at all other than the metabolic cost. They're essentially concentric against an unmovable object and increase muscle fiber recruitment. Great Peaty tool.
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@sphenoid Sure, but the injuries are more a result of lack of proper preparation/inadequate environment than they are about inherent flaws in our design and nature. I think "Why Zebras don't get ulcers" was a good example of this. Even the pro athletes can't run without injuring themselves these days. See the Super Bowl last night where a guy blew his Achilles running onto the field. The weight room/training regimens and the culture are all highly maladaptive.
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When I played rugby at uni in the off Season I would tape off 20-30 yards.
Sprint as hard as possible
Rest until I caught my breath
Then repeat until I couldn't do 100%
If it isn't max effort you aren't sprinting but anything below all out just pack it in. If you shoot for 3-5 bouts in the beginning you should be good to progress distance or bouts -
@mangala Can you expand on the positions you start in?
