nhaliday + embodied-pack   47

Stretching and injury prevention: an obscure relationship. - PubMed - NCBI
Sports involving bouncing and jumping activities with a high intensity of stretch-shortening cycles (SSCs) [e.g. soccer and football] require a muscle-tendon unit that is compliant enough to store and release the high amount of elastic energy that benefits performance in such sports. If the participants of these sports have an insufficient compliant muscle-tendon unit, the demands in energy absorption and release may rapidly exceed the capacity of the muscle-tendon unit. This may lead to an increased risk for injury of this structure. Consequently, the rationale for injury prevention in these sports is to increase the compliance of the muscle-tendon unit. Recent studies have shown that stretching programmes can significantly influence the viscosity of the tendon and make it significantly more compliant, and when a sport demands SSCs of high intensity, stretching may be important for injury prevention. This conjecture is in agreement with the available scientific clinical evidence from these types of sports activities. In contrast, when the type of sports activity contains low-intensity, or limited SSCs (e.g. jogging, cycling and swimming) there is no need for a very compliant muscle-tendon unit since most of its power generation is a consequence of active (contractile) muscle work that needs to be directly transferred (by the tendon) to the articular system to generate motion. Therefore, stretching (and thus making the tendon more compliant) may not be advantageous. This conjecture is supported by the literature, where strong evidence exists that stretching has no beneficial effect on injury prevention in these sports.
study  survey  health  embodied  fitness  fitsci  biomechanics  sports  soccer  running  endurance  evidence-based  null-result  realness  contrarianism  homo-hetero  comparison  embodied-pack 
november 2017 by nhaliday
How to estimate distance using your finger | Outdoor Herbivore Blog
1. Hold your right arm out directly in front of you, elbow straight, thumb upright.
2. Align your thumb with one eye closed so that it covers (or aligns) the distant object. Point marked X in the drawing.
3. Do not move your head, arm or thumb, but switch eyes, so that your open eye is now closed and the other eye is open. Observe closely where the object now appears with the other open eye. Your thumb should appear to have moved to some other point: no longer in front of the object. This new point is marked as Y in the drawing.
4. Estimate this displacement XY, by equating it to the estimated size of something you are familiar with (height of tree, building width, length of a car, power line poles, distance between nearby objects). In this case, the distant barn is estimated to be 100′ wide. It appears 5 barn widths could fit this displacement, or 500 feet. Now multiply that figure by 10 (the ratio of the length of your arm to the distance between your eyes), and you get the distance between you and the thicket of blueberry bushes — 5000 feet away(about 1 mile).

- Basically uses parallax (similar triangles) with each eye.
- When they say to compare apparent shift to known distance, won't that scale with the unknown distance? The example uses width of an object at the point whose distance is being estimated.

per here: https://www.trails.com/how_26316_estimate-distances-outdoors.html
Select a distant object that the width can be accurately determined. For example, use a large rock outcropping. Estimate the width of the rock. Use 200 feet wide as an example here.
outdoors  human-bean  embodied  embodied-pack  visuo  spatial  measurement  lifehack  howto  navigation  prepping  survival  objektbuch  multi  measure  estimate 
august 2017 by nhaliday
CURRENT CONCEPTS IN MUSCLE STRETCHING FOR EXERCISE AND REHABILITATION
Three muscle stretching techniques are frequently described in the literature: Static, Dynamic, and Pre-Contraction stretches (Figure 2).

Static stretching is effective at increasing ROM.

Unfortunately, however, static stretching as part of a warm-up immediately prior to exercise has been shown detrimental to dynamometer-measured muscle strength19–29 and performance in running and jumping.30–39 The loss of strength resulting from acute static stretching has been termed, “stretch-induced strength loss.”3 The specific causes for this type of stretch induced loss in strength is not clear; some suggest neural factors,31,40 while others suggest mechanical factors.19,23

In general, it appears that static stretching is most beneficial for athletes requiring flexibility for their sports (e.g. gymnastics, dance, etc.). Dynamic stretching may be better suited for athletes requiring running or jumping performance30 during their sport such as basketball players or sprinters.

Stretching has not been shown to be effective at reducing the incidence of overall injuries.88 While there is some evidence of stretching reducing musculotendinous injuries,88 more evidence is needed to determine if stretching programs alone can reduce muscular injuries.3
study  health  fitness  fitsci  evidence-based  running  embodied  sports  survey  summary  biomechanics  endurance  embodied-pack 
august 2017 by nhaliday
Bisphenol A (BPA)
Alternatives to BPA containers not easy for U.S. foodmakers to find: http://www.washingtonpost.com/wp-dyn/content/article/2010/02/22/AR2010022204830.html

Food is main source of BPA for consumers, thermal paper also potentially significant: https://www.efsa.europa.eu/en/press/news/130725
New data resulting from an EFSA call for data led to a considerable refinement of exposure estimates compared to 2006. For infants and toddlers (aged 6 months-3 years) average exposure from the diet is estimated to amount to 375 nanograms per kilogram of body weight per day (ng/kg bw/day) whereas for the population above 18 years of age (including women of child-bearing age) the figure is up to 132 ng/kg bw/day. By comparison, these estimates are less than 1% of the current Tolerable Daily Intake (TDI) for BPA (0.05 milligrams/kg bw/day) established by EFSA in 2006.

For all population groups above three years of age thermal paper was the second most important source of BPA after the diet (potentially accounting for up to 15% of total exposure in some population groups).

Among other key findings, scientists found dietary exposure to BPA to be the highest among children aged three to ten (explainable by their higher food consumption on a body weight basis). Canned food and non-canned meat and meat products were identified as major contributors to dietary BPA exposure for all age groups.

Tips for Avoiding BPA in Canned Food: http://www.breastcancerfund.org/reduce-your-risk/tips/avoid-bpa.html

Holding Thermal Receipt Paper and Eating Food after Using Hand Sanitizer Results in High Serum Bioactive and Urine Total Levels of Bisphenol A (BPA): http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0110509

Bisphenol S Disrupts Estradiol-Induced Nongenomic Signaling in a Rat Pituitary Cell Line: Effects on Cell Functions: http://ehp.niehs.nih.gov/1205826/
common substitute for BPA

http://wellnessmama.com/54748/hidden-sources-of-bpa/

Effect of probiotics, Bifidobacterium breve and Lactobacillus casei, on bisphenol A exposure in rats: https://www.ncbi.nlm.nih.gov/pubmed/18540113

What are the sources of exposure to eight frequently used phthalic acid esters in Europeans?: https://www.ncbi.nlm.nih.gov/pubmed/16834635
Food is a main source of DiBP, DnBP, and DEHP in consumers. In this case, consumers have very few possibilities to effectively reduce their exposure.

Are endocrine disrupting compounds a health risk in drinking water?: https://www.ncbi.nlm.nih.gov/pubmed/16823090

How to Avoid Phthalates (Even Though You Can't Avoid Phthalates): http://www.huffingtonpost.com/maia-james/phthalates-health_b_2464248.html
data  org:gov  hypochondria  endocrine  embodied-street-fighting  public-health  news  org:rec  business  tradeoffs  food  multi  study  summary  diet  top-n  org:euro  org:health  nitty-gritty  human-bean  checklists  cooking  embodied  human-study  science-anxiety  sanctity-degradation  intervention  epidemiology  bio  🐸  model-organism  list  health  hmm  idk  parasites-microbiome  street-fighting  evidence-based  objektbuch  embodied-pack  chart  roots  h2o  advice  org:lite  biodet  fluid  left-wing 
january 2017 by nhaliday
Alcohol for Exmos: A Very, Very Basic Beginner's Guide to Drinking : exmormon
12oz of beer (~5% alcohol) = 1 5oz of wine (~12% alcohol) = 1 1.5oz (ie, 1 shot) of spirits (~40% alcohol) = 1 "drink"
https://en.wikipedia.org/wiki/Standard_drink
reddit  social  discussion  ethanol  human-bean  objektbuch  food  data  embodied  embodied-pack  multi  wiki  reference 
january 2017 by nhaliday
What is up with carbon dioxide and cognition? An offer - Less Wrong Discussion
study: http://ehp.niehs.nih.gov/1104789/
n=22, p-values < .001 generally, no multiple comparisons or anything, right?
chart: http://ehp.niehs.nih.gov/wp-content/uploads/2012/11/ehp.1104789.g002.png
- note it's CO2 not oxygen that's relevant
- some interesting debate in comments about whether you would find similar effects for similar levels of variation in oxygen, implications for high-altitude living, etc.
- CO2 levels can range quite to quite high levels indoors (~1500, and even ~7000 in some of Gwern's experiments); this seems to be enough to impact cognition to a significant degree
- outdoor air quality often better than indoor even in urban areas (see other studies)

the solution: houseplants, http://lesswrong.com/lw/nk0/what_is_up_with_carbon_dioxide_and_cognition_an/d956

https://twitter.com/menangahela/status/965167009083379712
https://archive.is/k0I0U
except that environmental instability tends to be harder on more 'complex' adaptations and co2 ppm directly correlates with decreased effectiveness of cognition-enhancing traits vis chronic low-grade acidosis
productivity  study  gotchas  workflow  money-for-time  neuro  gwern  embodied  hypochondria  hmm  lesswrong  🤖  spock  nootropics  embodied-cognition  evidence-based  ratty  clever-rats  atmosphere  rat-pack  psychology  cog-psych  🌞  field-study  multi  c:**  2016  human-study  acmtariat  embodied-street-fighting  biodet  objective-measure  decision-making  s:*  embodied-pack  intervention  iq  environmental-effects  branches  unintended-consequences  twitter  social  discussion  backup  gnon  mena4  land  🐸  environment  climate-change  intelligence  structure 
may 2016 by nhaliday

bundles : embodiedstars

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