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From Fellrnr.com, Running tips
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=Trainable Factors =
These are the most likely factors that determine performance and are amenable to training. There are other factors, such as genetics that are obviously not trainable.
* '''[[VO2max|V̇O<sub>2</sub>max]]'''. Aerobic capacity appears to be a the key aspect component of performance for races from the 5K<ref name="RamsbottomNute1987"/> to 24 hours<ref name="MilletBanfi2011"/>.* '''Running Economy'''. How fast you run for a given oxygen consumption is another critical aspect of performance<ref name="MilletBanfi2011"/><ref name="ScrimgeourNoakes1986"/>. One paper concluded that [[Running Economy]] factors included "''metabolic adaptations within the muscle such as increased mitochondria and oxidative enzymes, the ability of the muscles to store and release elastic energy by increasing the stiffness of the muscles, and more efficient mechanics leading to less energy wasted on braking forces and excessive vertical oscillation''" <ref name="PaavolainenHäkkinen1999"/>. There is also evidence that reduced breathing effort is partly responsible for improved RE. See [[The Science of High Intensity Interval Training]]. * '''Endurance'''. It's generally accepted that training is required to race longer distances. Being a fast 5K runner doesn't mean you can run the marathondistance. Even trained runners show symptoms of neuromuscular fatigue running marathon or longer races<ref name="TarnopolskyMillet2011"/><ref name="NicolKomi2007"/>. I've split "endurance" into two parts, mechanical and biochemical.** '''Mechanical Endurance'''. I'm using this term to primarily reflect the ability of the muscles to withstand eccentric exercise, but also to reflect changes in bone and connective tissue. There's good evidence from [[Delayed Onset Muscle Soreness]] (DOMS) that this is both trainable and critical for performance. DOMS produces immediate weakness in the muscles, well before any soreness occurs. ** '''Biochemical Endurance'''. Beyond the mechanical endurance there appears to be other factors. This is evident from long distance cycling, which includes no eccentric exercise. It's unclear to me the details of this biochemical endurance, but I suspect it's related to the glycogen and fat metabolism.
There are also some other possibly useful training adaptations.
* '''Fractional utilization'''. The percentage of [[VO2max|V̇O<sub>2</sub>max]] that can be maintained for given distances may be both trainable and a determinate of performance. The research for this is a little more limited, and confounded by improvements in [[VO2max|V̇O<sub>2</sub>max]] resulting in faster race pace, which results in shorter race times, and the fractional utilization for the shorter times is shorter. This concept is sometimes thought of as [[Lactate Threshold]], though that concept is rather more complex than it appears.
* '''Altitude adaptation'''. There are sea level performance improvements from altitude training, but the cost is prohibitive for many athletes.
* '''Uphill muscles'''. Running up hill uses slightly different muscles and biomechanics, so for hilly races some uphill running is likely beneficial.
* '''Downhill technique'''. The relative performance benefit of improved downhill running technique might be significant, something that's especially important for trail races. Note that the benefits of downhill running on mechanical endurance are separate.
=Training Techniques=
The options for improving the trainable factors is often are to determine based on the research.
This is the best studied trait as it's easy to evaluate in the lab. The most effective training appears to be [[High Intensity Interval Training]], though any form of exercise is likely to improve [[VO2max|V̇O<sub>2</sub>max]] in sedentary subjects. A reduction in body fat is another way of indirectly improving [[VO2max|V̇O<sub>2</sub>max]] (as well as running economy.)
==Running Economy==
Improving Running Economy is not as well studied as [[VO2max|V̇O<sub>2</sub>max]], but there are a number of well documented approaches. * There is [[The Science of High Intensity Interval Training| research supporting the use of HIIT to improve RE]]* Explosive (plyometrics) or maximal strength training improves RE, and can even improve the economy of cycling<ref name="RønnestadMujika2014"/>.* There's some evidence that intermittent hypoxia might help with RE<ref name="BurtscherGatterer2010"/>.* One study suggests that training volume may improve RE<ref name="ScrimgeourNoakes1986"/>, but it's unclear if that's overall mileage covered, or if it's an increase in a specific training type. It seems likely to me that the underlying mechanism for improving RE via HIIT or plyometrics/max strength training is similar. Given the injury risk of plyometrics/max strength training I'm going to focus on HIIT only. ==Mechanical Endurance ==The evidence from [[Delayed Onset Muscle Soreness]] (DOMS) is clear that it's the eccentric load that builds mechanical endurance. This occurs in running, but not cycling or swimming, and is greatly multiplied by downhill running. ==Biochemical Endurance ==There is very little research available into Biochemical Endurance, and I've reviewed this at [[The Science of the Long Run]].
==Fractional utilization==
The vast confusion around [[Lactate Threshold]] makes this tricky to study, but the available research indicates that [[Tempo Runs]] (and other "threshold" training) are ineffective and should be avoided. Instead, training should be polarized to either be long and slow, or HIIT.
==Heat adaptation ==
Training in the heat, or passive exposure to heat creates adaptation. See [[Heat Acclimation Training]] for details.
==Altitude adaptation==
==Uphill muscles==
==Downhill technique ==
I have no science for this, but my anecdotal experience is that [[Downhill Running]] if far more important than anyone realizes. I've worked with a runner who went from 9 min/miles on a given asphalt downhill to sub 7 min/miles at a similar heart rate and perceived effort on the same hill. Skill on downhill trails can be the difference between a slow walk, picking your way and flying down.
=Fellrnr's Three Component Model=
I'm going to simplify the training model into three primary components; [[VO2max|V̇O<sub>2</sub>max]], Mechanical Endurance (ME) and Biochemical Endurance (BE). I'm building on the concept of [[TRIMP]] (Training Impulse]] to create a three-component model, TRIMP<sup>v</sup>, TRIMP<sup>me</sup>, TRIMP<sup>be</sup>. (Note I'm still at the stage of creating a theoretical framework, with implementation some way off.)
==TRIMPv ==
TRIMP<sup>v</sup> is the training impulse primarily from HIIT.
* The nature of HIIT means that Heart Rate can't be used due to the lag. Doing a 20 second "all out" interval might not get the heart rate above an easy run level.
* The training impulse for TRIMP<sup>v</sup> is going to be based on the time above the power output at [[VO2max|V̇O<sub>2</sub>max]]. Another approach would be a scaling factor that limits the contribution below [[VO2max|V̇O<sub>2</sub>max]] without ignoring it completely.
* Scaling needs to be non-linear with power, probably exponential.
* Scaling also needs to include time, as 30 seconds is far more than twice as hard as 15 seconds at high intensity.
* Recovery from HIIT is fairly fast, with evidence that subjects can do 4 days/week. If HIIT is similar to resistance training, then 4 days/week might be optimal. (Big "if" of course.)
==TRIMPme==
TRIMP<sup>me</sup> is the training impulse from eccentric exercise.
* This only applies to running, not cycling, swimming, etc.
* There is no scaling for intensity, as running faster doesn't create much more impact.
* Scaling needs to be based on slope, with downhill creating a lot more impact, uphill much less.
* Recovery from eccentric exercise is the longest time frame. While the soreness peaks around 24-72 hours after training, the weakness can last 4-7 days.
* The performance degradation from eccentric can be dramatic.
==TRIMPbe==
TRIMP<sup>be</sup> is the training impulse from endurance exercise.
* While this is complex, I'm going to use the idea of Glycogen depletion as the proxy for the overall training impulse.
* HIIT rapidly depletes [[Glycogen]] and will change the TRIMP<sup>be</sup> of endurance training that follows rapidly afterward.
* This will scale intensity in the same way that the original [[TRIMP]] scales.
=Training Frequency=
=References=
<references>
<ref name="TarnopolskyMillet2011">Mark Tarnopolsky, Guillaume Y. Millet, Katja Tomazin, Samuel Verges, Christopher Vincent, Régis Bonnefoy, Renée-Claude Boisson, Laurent Gergelé, Léonard Féasson, Vincent Martin, Neuromuscular Consequences of an Extreme Mountain Ultra-Marathon, PLoS ONE, volume 6, issue 2, 2011, pages e17059, ISSN [http://www.worldcat.org/issn/1932-6203 1932-6203], doi [http://dx.doi.org/10.1371/journal.pone.0017059 10.1371/journal.pone.0017059]</ref>
<ref name="NicolKomi2007">C. Nicol, P. V. Komi, P. Marconnet, Fatigue effects of marathon running on neuromuscular performance, Scandinavian Journal of Medicine & Science in Sports, volume 1, issue 1, 2007, pages 10–17, ISSN [http://www.worldcat.org/issn/09057188 09057188], doi [http://dx.doi.org/10.1111/j.1600-0838.1991.tb00265.x 10.1111/j.1600-0838.1991.tb00265.x]</ref>
<ref name="KrustrupS??Derlund2004">Peter Krustrup, Karin S??Derlund, Magni Mohr, Jens Bangsbo, Slow-Twitch Fiber Glycogen Depletion Elevates Moderate-Exercise Fast-Twitch Fiber Activity and O2 Uptake, Medicine & Science in Sports & Exercise, volume 36, issue 6, 2004, pages 973–982, ISSN [http://www.worldcat.org/issn/0195-9131 0195-9131], doi [http://dx.doi.org/10.1249/01.MSS.0000128246.20242.8B 10.1249/01.MSS.0000128246.20242.8B]</ref>
<ref name="PaavolainenHäkkinen1999">Leena Paavolainen, Keijo Häkkinen, Ismo Hämäläinen, Ari Nummela, Heikki Rusko, Explosive-strength training improves 5-km running time by improving running economy and muscle power, Journal of Applied Physiology, volume 86, issue 5, 1999, pages 1527–1533, ISSN [http://www.worldcat.org/issn/8750-7587 8750-7587], doi [http://dx.doi.org/10.1152/jappl.1999.86.5.1527 10.1152/jappl.1999.86.5.1527]</ref>
<ref name="RønnestadMujika2014">B. R. Rønnestad, I. Mujika, Optimizing strength training for running and cycling endurance performance: A review, Scandinavian Journal of Medicine & Science in Sports, volume 24, issue 4, 2014, pages 603–612, ISSN [http://www.worldcat.org/issn/09057188 09057188], doi [http://dx.doi.org/10.1111/sms.12104 10.1111/sms.12104]</ref>
<ref name="BurtscherGatterer2010">M. Burtscher, H. Gatterer, M. Faulhaber, W. Gerstgrasser, K. Schenk, Effects of Intermittent Hypoxia on Running Economy, International Journal of Sports Medicine, volume 31, issue 09, 2010, pages 644–650, ISSN [http://www.worldcat.org/issn/0172-4622 0172-4622], doi [http://dx.doi.org/10.1055/s-0030-1255067 10.1055/s-0030-1255067]</ref>
</references>