Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scaling in Athletic World Records   World records in athletics provide a measure of physical as well as
physiological human performance. Here we analyse running records and show that
the mean speed as a function of race time can be described by two scaling laws
that have a breakpoint at about 150-170 seconds (corresponding to the ~1,000 m
race). We interpret this as being the transition time between anaerobic and
aerobic energy expenditure by athletes.

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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
2
The categories of this paper are: math
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The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg