Kenapa kita mengayunkan tangan ketika berjalan

Marco86 · Jul 29, 2009

Penelitian ini rada aneh, tapi oke lah buat nambah2 pengetahuan kita2...

http://news.yahoo.com/s/afp/20090728/sc_afp/sciencearmsoffbeat

Out on a limb: Arm-swinging riddle is answered

PARIS (AFP) – Biomedical researchers on Wednesday said they could explain why we swing our arms when we walk, a practice that has long piqued scientific curiosity.

Swinging one's arms comes at a cost. We need muscles to do it, and we need to provide energy in the form of food for those muscles. So what's the advantage?

Little or none, some experts have said, contending that arm-swinging, like our appendix, is an evolutionary relic from when we used to go about on all fours.

But a trio of specialists from the United States and the Netherlands have put the question to rigorous tests.

They built a mechanical model to get an idea of the dynamics of arm-swinging and then recruited 10 volunteers, who were asked to walk with a normal swing, an opposite-to-normal swing, with their arms folded or held by their sides.

The metabolic cost of this activity was derived from oxygen consumption and carbon dioxide (CO2) production as the human guinea pigs breathed in and out.

Arm-swinging turned out to be a plus, rather than a negative, the investigators found.

For one thing, it is surprisingly, er, "'armless" in energy costs, requiring little torque, or rotational twist, from the shoulder muscles.

Holding one's arms as one walks requires 12 percent more metabolic energy, compared with swinging them.

The arms' pendulum swing also helps dampen the bobbly up-and-down motion of walking, which is itself an energy drain for the muscles of the lower legs.

If you hold your arms while walking, this movement, called vertical ground reaction moment, rises by a whopping 63 percent.

Should you prefer to walk with an opposite-to-normal swing -- meaning that your right arm moves in sync with your right leg and your left arm is matched to the motion of your left leg -- the energy cost of using your shoulder muscles will fall.

The downside, though, is that opposite-to-normal swing forces up the metabolic rate by a quarter.

The study, headed by Steven Collins at the University of Michigan at Ann Arbor, says we should give the thumb's-up to arm swinging.

"Rather than a facultative relic of the locomotion needs of our quadrupedal ancestors, arm swinging is an integral part of the energy economy of human gait," says the paper.

It appears in Proceedings of the Royal Society B, the biological research journal of the Royal Society, Britain's de-facto academy of sciences.
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Izan · Jul 29, 2009

kalo menurut gwa si kadang kalo jalan tangan ga di ayun ga enak juga si

Hell_Raiser · Jul 29, 2009

Mmmm..... jadi mengayunkan tangan pake energi lebih sedikit daripada tangannya diem, aku sih kalo tangan diem paling bahuku yg pegel

blue_lionx · Jul 29, 2009

sama kek minato, ane tangannya dimasukin ke tangan biar kek L..

Minato_Arisato · Jul 29, 2009

^ L di the movie tangannya ngayun juga pas lari hehehe

Pujols · Jul 29, 2009

klo aku pas jalan, cuma jari tangan aja yg banyak gerak, sms-an soalnya, tangan ga ikutan gerak .....

venantius · Jul 29, 2009

Kalo tangannya ga diayun ya malah pegel jadinya..
serasa terkekang gitu..

gheega · Jul 30, 2009

klo tangan ga diayunin ktika jalan mah jd kayak robot.

bl4ck_aca · Jul 30, 2009

ehm...tangan kita mengayun..
mungkin itu tujuannya untuk menyalaraskan dengan gerakan tubuh kita...
biar seimbang gitu...

renkinjutsushi · Jul 30, 2009

kalo tangan gak di ayunin berarti butuh gaya buat nahan ayunan yah
hmmmm . . . .

KyleSteward · Jul 30, 2009

Buad jaga keseimbangan kyknya. Kadang klo jalan, tangan ga diayun sama sekali. Rasanya jalan kurang enak gitu.

oranggila · Jul 30, 2009

klo jalan tangan ngak diayun udah kayak ASIMO

tapi klo lari ngak diayun bisa kencang tuh kayak NARUTO

flippin · Jul 30, 2009

pertama kirain w joke

pernah baca buku tebak"an ..
jawabannya karena pakai baju dan celana

swtmath · Jul 30, 2009

iya emang kalau jalan enakan tangan di ayun. ternyata ada gunanya juga ya.

budikikiw · Jul 30, 2009

kalo dari Ilmu kedokteran sih itu kompensasi tubuh untuk menjaga keseimbangan kk

azkha · Jul 30, 2009

Klo d ayun emang lbih renyah kyakx,,,,

Loki134 · Jul 30, 2009

kl gk diayun pegel tngnNy..
bayangin aj dlu pas kita lg upacara bendera.. lbh pegel pas disuruh berdiri diem gk gerak2 drpd kl kita jalan2 di mall..

tsuchimikado · Aug 2, 2009

untuk menyeimbangkan momentum tubuh yang bergerak ke depan, mau ga mau akan terbentuk momen pada engsel tangan yang menyebabkan tangan akan bergerak secara alami ketika kita berjalan.

BlackD · Aug 2, 2009

menurutku sih jalan tangan diayun sih udah reflek....justru malah tambah tenaga buat nahan kalo tangan ga diayun

ireh · Aug 2, 2009

qt ngayunin tangan wkt jalan kan buat keseimbangan tubuh wkt berjalan+sekaligus memudahkan qt wkt berjalan,
coba aja berjalan tanpa ngayunin tangan, kan ga enak rasanya.....

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