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Sharkstar

Member since Oct 2007 • Last active May 2017

Most recent activity

  • in Bikes & Bits
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    Very expensive for what they are: disposable masks. The 3m-9925 has p2 protection and a carbon filter and comes in at £40 for a pack of ten. Obviously, it doesn't look as cool as the Cambridge ones. respiratorshop.co.uk/3m-9925-­ffp2-valved-welding-fume-respirator-10-b­ox.html

    I also don't see any ISO standard certification on the Cambridge mask site. 3M and the other industrial suppliers have years of experience making and testing these things. There are often real and immediate consequences for their customers if they fail.

  • in Bikes & Bits
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    ncbi.nlm.nih.gov/pmc/article­s/PMC5289918/

    Background:
    Practical approaches to protect individuals from ambient particulate matter (PM) are urgently needed in developing countries. Evidence on the health benefits of wearing particulate-filtering respirators is limited.

    Objectives:
    We evaluated the short-term cardiovascular health effects of wearing respirators in China.

    Methods:
    A randomized crossover trial was performed in 24 healthy young adults in Shanghai, China in 2014. The subjects were randomized into two groups and wore particulate-filtering respirators for 48 hr alternating with a 3-week washout interval. Heart rate variability (HRV) and ambulatory blood pressure (BP) were continuously monitored during the 2nd 24 hr in each intervention. Circulating biomarkers were measured at the end of each intervention. Linear mixed-effect models were applied to evaluate the effects of wearing respirators on health outcomes.

    Results:
    During the intervention periods, the mean daily average concentration of PM with an aerodynamic diameter < 2.5 μm (PM2.5) was 74.2 μg/m3. Compared with the absence of respirators, wearing respirators was associated with a decrease of 2.7 mmHg [95% confidence interval (CI): 0.1, 5.2 mmHg] in systolic BP and increases of HRV parameters, including 12.5% (95% CI: 3.8%, 21.2%) in high frequency (HF) power, 10.9% (95% CI: 1.8%, 20.0%) in the root mean square of the successive differences, and 22.1% (95% CI: 3.6%, 40.7%) in the percentage of normal RR intervals with duration > 50 msec different from the previous normal RR interval (pNN50). The presence of respirators was also associated with a decrease of 7.8% (95% CI: 3.5%, 12.1%) in the ratio of low frequency (LF)/HF power.

    Conclusions:
    Short-term wearing of particulate-filtering respirators may produce cardiovascular benefits by improving autonomic nervous function and reducing BP.

  • in Bikes & Bits
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    Obviously, but for less than twenty quid you can try it yourself. Much better value than the cycling-specific masks where all your money goes on margin, styling and marketing.

  • in Bikes & Bits
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    You get condensation but it's kept off your face, so no big deal, and it doesn't feel like the air gets particularly 'wet'. My commute's only 30 mins but you could probably go a couple of hours without having to pour the water out. So far, that's not as bad as it probably sounds. On the whole, feels a lot better than breathing diesel filth.

  • in Bikes & Bits
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    #takecontrol

    Twenty quid in Screwfix. Comfy, breathable. Only downside is the obvious one.

  • in Rider Down
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    An absolute fucking travesty.

  • in Bikes & Bits
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    I'm gradually getting used to mine. All this is true if you recharge every day and format your SD card every day (or every other day). On balance, still a better option for everyday use than the larger camera.

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  • in Components, clothing and miscellany
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    SLs?

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