Weird (horrifying) study of human movement

A couple of weeks ago the New York Times linked to a new study on age-related declines in human movement. It’s an odd study, but not because of the result (which shows that children start moving less at age 6), because that seems entirely predictable to me, despite the general understanding previously having been that the decline started in adolescence.

Rather, what makes the study seem odd to me is the weird blind spot the researchers seem to have about when and how organisms (including humans) choose to move.

In the study itself the researchers make clear that they had considered the obvious presumption—that kids start moving less when they start going to school: “The overt explanation for this earlier decline could be the increased sitting times due to school.”

The  blind spot I’m talking about is presented in the next sentence, where they immediately qualified that:

However, time-specific analysis of [physical activity] has revealed that in addition to the increased [sedentary behavior] during school hours, there was also a distinct decline on weekends, out-of-school days, and during lunchtime.

Schwarzfischer P, Gruszfeld D, Stolarczyk A, et al. Physical Activity and Sedentary Behavior From 6 to 11 Years.Pediatrics. 2019;143(1):e20180994

What’s weird and horrifying is that they make that statement seemingly without it occurring to them that forcing children to sit still for hours on 5/7ths of the days of the week might affect their behavior on the other 2/7ths of the days.

Right off the top of my head I can think of four obvious reasons that would be true:

  1. The required behavior in school normalizes the behavior of extended sitting.
  2. Even a few weeks of enforced extended sitting will result in the kids becoming deconditioned aerobically, making physical activity more difficult and less appealing.
  3. Extended periods spent in any static posture—especially the static posture of sitting—will begin the process of reducing their range of motion (they’ll pretty quickly lose the ability to squat, for example), again making physical activity more difficult and less appealing.
  4. The addition of “physical education” to the kids daily schedule sets the pattern of replacing movement with exercise—a time-bound, regimented activity which attempts to pack the health benefits of a week’s worth of movement into just a few hours. (I’ve written about this before.)

Just one instance of this blind spot is bad enough, but it shows up again in in a key reference. The researchers say that it is accepted that physical activity declines with age: “A natural and biologically determined decline of total [physical activity] throughout the life span seems likely.” They support that assertion with a couple of references, one of which looks specifically at movement in non-human animals.

Unfortunately that study (Ingram, D. K. Age-related decline in physical activity: generalization to nonhumans. Med. Sci. Sports Exerc., Vol. 32, No. 9, pp. 1623-1629, 2000, which is sadly behind a pay-wall.) has exactly the same blind spot: All the animals studied were captive animals. That study looked at how animal movement varies when an animal is moved from its “home cage” to some other cage. I can’t say I’m the least bit surprised the behavior of those captive animals closely resembles the behavior of children moved from home to school and back again.

I would be very interested in studies that included some free-range animals. (Which isn’t something I can do, but which seems at least possible now that accelerometers  are cheap.)

Of course school isn’t the only factor that inhibits children from moving more. The restrictions on self-directed play so well documented by Lenore Skenazy of Let Grow no doubt feed in as well.

So it would be great if there were studies of movement in free-range kids as well.

The final weird and horrifying thing isn’t anything new, but is something I hadn’t really been aware of before: The assumption that an age-related reduction in movement is “natural and biologically determined,” has led directly to public policies that normalize it:

This decline is also represented in recommendations from the World Health Organization (WHO): preschool-aged children should accumulate a minimum of 180 minutes per day of total [physical activity], children and adolescents (4–17 years old) at least 60 minutes per day, and adults only a minimum of 30 minutes per day in moderate-to-vigorous physical activity (MVPA).

To which I say, “Argh!”

I probably wouldn’t be so struck by this if I weren’t already tracking my own movement. (Cheap accelerometers again.)

For some time now I’ve been working to a goal of 105 minutes of movement per day, and over the last few weeks I’ve come pretty close, averaging just over 102 minutes of movement per day, according to Google Fit. (This number, based primarily on steps, somewhat underestimates my movement. In particular it gives me almost no credit for the time I spend teaching taiji, because although there’s plenty of movement, there’s not much stepping.)

The WHO recommendations make me strongly motivated to upgrade my goal for movement to 180 minutes per day.

Why should kids under 6 get all the fun?

(The image at the top is topical only in that it is is a photo from our afternoon walk yesterday.)

Workers skipping the stress and paperwork of resigning

Despite the unnecessary casting of aspersions on millennials in the setup to this piece, it’s both pretty good and pretty satisfying.

There are many things about looking for a job that suck, and the way potential employers treat you—beginning with running your resume through an opaque filter that decides whether you get an interview or not, and ending with simply never telling you that you didn’t get the job—is near the top of the list.

Given that, I have considerable sympathy with employees who find a better job taking the easy way out for quitting: just not showing up. (Frankly, I’m sure employers would totally do the same thing if there wasn’t a Department of Labor telling them that they had to pay you for any hours that you work after they secretly let you go.)

It would be very easy for employers to avoid this fate almost entirely. First, by treating their employees with respect, like people who matter as individuals. Second, by making sure that their employee’s interest align with the interests of the enterprise, though things like an equity interest and bonuses that depend on the success of the enterprise (rather than on stupid metrics that supposedly measure the employee’s performance).

“Employees leave jobs that suck,” they said in an email. “Jobs where they’re abused. Jobs where they don’t care about the work. And the less engaged they are, the less need they feel to give their bosses any warning.”

Source: Workers are ghosting their employers like bad dates – The Washington Post

Hopeful about our democracy

After being briefly disappointed that the blue wave didn’t materialize as strongly as I’d hoped, I find that I am nevertheless rather hopeful about the future of our democracy.

This hopefulness springs from two causes. First, there are already more Democratic voters than there are Republican. Second, the Fifteenth Amendment is already part of the constitution.

We’re a majority

The number of votes cast for a Democratic House candidate exceeded the number cast for a Republican House candidate by well in excess of 4 million votes. We’re already in the majority by several percentage points.

The reasons don’t already control the levers of power are well understood. The Constitution, through the Senate and the Electoral College, give excess power to small states which currently lean Republican. The Republicans have been more shameless about gerrymandering. Voter suppression efforts targeted at ethnic minorities and at the young have been effective at reducing votes for Democrats.

Even if all of those things stay the same, we’re still a majority, and over time that will win out.

We will probably take control even before time (and demographic changes) bring us to that point. All it will take is a leader charismatic enough to produce some modest coattails, and we’ll once again have a Democratic government.

Once that happens, I very much hope, the Democrats will seize the opportunity to put an end to the gerrymandering and the voter suppression. That will put and end to the power of the racist wing of the Republican party, even if the Senate and the Electoral College remain unreformed.

How can that be done? Through the Fifteenth Amendment.

The Fifteenth amendment exists

Under the Fifteenth amendment, Congress has the power to enact appropriate legislation to ensure that “The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude.”

The Supreme Court struck down some of the rules enacted to do that, thereby enabling the recent spike in voter suppression. But the Supreme Court did not rule in favor of voter suppression. Rather, its decision turned rather narrowly on the “appropriate” part of the Congress’s power to legislate on the topic.

Supposedly, once the law had been in force for decades, it got too easy for Congress to just extend it, without doing the analysis to justify its appropriateness. Along those lines, the fact that the law treated some states (those that tried to suppress minority votes) differently from other states (those that did not) “despite our historic tradition that all the States enjoy equal sovereignty” was something the court objected to.

These things can be easily fixed. Congress can do the analysis to justify a long list of required and prohibited practices, and can apply those rules to all the states equally.

If we were a minority, the way the Republicans are, I’d be very worried. If we lacked a Fifteenth amendment, and had to fix this state-by-state, I’d be modestly worried.

As it is, I’m not so much worried as I am annoyed by what we’re having to go through at the moment.

Of course, I felt many of the same hopes back in 2012, and look where we ended up. No wonder some people think I’m a hopeless optimist.

What good is a militia anyway?

The reason that a well-regulated militia appealed to the founding fathers was that they hoped it would eliminate the need for a standing army.

If you had the whole body of young adult men armed and trained, it was hoped you could raise an army very quickly in case of need. If that were true, Congress could insist that the standing army be run down to just a cadre of specialists and officers. Then, in the event that you needed an army—because you were invaded, or needed to invade someone else—you could mobilize (i.e. draft) the militia to fill the ranks with soldiers.

The founders knew perfectly well that a government with a standing army could not be resisted by the people, even if the people were armed. A standing army was always going to be more disciplined, more highly trained, and better equipped than a militia could possibly be.

So, the purpose of the militia was to eliminate the need for a standing army. If you could make a militia work that way—quickly go from a bare cadre to a fully mobilized army simply by calling up the militia—then you’d be in a position where Congress could insist that the the army in fact be a bare cadre, meaning that neither presidents nor generals could use the army until Congress actually raised one.

It’s an appealing idea, particularly to someone like me who is very doubtful about trusting presidents or generals. Sadly, the evidence is pretty good that it doesn’t work.

This was clear even before the sorts of modern, high-tech weapons and other equipment that take extensive training to learn how to use, and then nearly constant on-going training to preserve the capability.  It took five years to go from a 16,000-man army to a 1,000,000-man army during the civil war. The ramp up for WW I was quicker but also smaller—manpower grew by 16 times in two years rather than 62 times in five years, but that was from a much larger base—basically, a smallish standing army, not merely a cadre waiting to be filled out.

The experience of the U.S., at least as far back as the civil war, is that fielding an army by mobilizing a militia simply can’t happen fast enough to respond to an enemy with a standing army. (The experiences of Switzerland mobilizing to resist a possible Nazi invasion and Finland mobilizing against the Soviet Union at around the same time are interesting, but do not I think make the contrary case.)

Given all that, I’d have to say that a militia is pretty much obsolete, and has been for a couple of centuries at least.

Voting is a constitutional right

The right to vote is a constitutional right. It should not be abridged. In this way it is like all constitutional rights.

There is one important difference between the right to vote and most other constitutional rights. Most constitutional rights apply to “the people,” while the right to vote is a right of citizens. Because of that difference, it makes sense to verify that people registering to vote are citizens. But waiting until someone is at the poll and then demanding that they prove they’re a citizen is backwards.

It is, to use another constitutional right as an example, backwards exactly the same way it would be backwards to take your property for public use, and then make you run all over town for documentation to prove that you own it before you can get it back. Instead, we have a property registry to keep track of who has ownership rights, and then a process called eminent domain whereby the government has the opportunity to present to a court evidence that there is a public need for your property according to well-established rules, and to establish fair compensation. You have the opportunity to dispute that evidence, and to argue for a different interpretation of the rules or for higher compensation.

I would suggest that as being the right model for voting rights as well: We should have a voter registry to keep track of who has the right to vote, and then a court process whereby the government has the opportunity to prove that someone on that list does not have the right to vote according to well-established rules (not a citizen, not over 18, not residing in the precinct, dead). You should have the right to appear at the hearing and dispute both the evidence and the interpretation of the rules.

Nobody should ever be struck off the voter rolls without such a hearing—to my mind it would be just as unconstitutional as taking your property without a hearing.

If that is the standard—as it should be—then there is no need to present an identity document at the polling place. All you need to do is prove that you are the person who registered, which is easily done by comparing your signature when you request a ballot to your signature when you registered to vote.

In any case: The right to vote is a fundamental right of the citizen. Denying it without due process is wrong, and there should be substantial sanctions on anyone who does so (or attempts to do so).

More carbon in the air means less nutritious food

An interesting and important article about a researcher gathering data that seem to show that although more carbon in the air means plants grow faster, the result is plants with more sugar but less protein, minerals, vitamins, and other nutrients:

http://www.politico.com/agenda/story/2017/09/13/food-nutrients-carbon-dioxide-000511

the protein content of goldenrod pollen has declined by a third since the industrial revolution—and the change closely tracks with the rise in CO2.