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2 Terbizan, D. J., "Validity of seven commercially available heart rate monitors" 6 (6): 243-247, 2002
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5 Adams, M, "Son of a hitch: A geneology of arborists' climbing hitches"
6 Draper, N., "Plasma cortisol concentrations and percieved anxiety in response to on-sight rock climbing" 33 : 13-17, 2012
7 Fencl, M., "Physiological effects of bouldering activities in upper elementary school students" 199-209, 2011
8 España-Romero, V., "Physiolofical responses in rock climbing with repeated ascents over a 10-week period" 112 : 21-828, 2012
9 Gehris, J., "Physical activity levels during adventure : Physical education lessons" 18 (18): 245-257, 2012
10 Watts, P. B., "Oxygen uptake and energy expenditure for children during rock climbing activity" 26 : 49-55, 2014
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