Allometric Scaling of Rowing
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Transcript of Allometric Scaling of Rowing
Michele Baeder
The Study: Indoor Rowing“Multivariate allometric scaling of men’s world
indoor rowing championship performance”Vanderburgh et. all, 1996, Medicine and Science in
Sports and ExerciseWhen: 1995Where: World Indoor Rowing Championships-
Boston, Mass.Subjects: 148 male rowers ranging from world
class masters to club or intercollegiate levelsAll subjects rowed a 2500m erg piece on Concept
IIC stationary rowing ergometers
C.R.A.S.H.-B. Sprints (WIRC)
http://www.youtube.com/watch?v=gN2WX10hBUc
BackgroundThe event of the WIRC is a single 2500m row on a
stationary ergometer.This is a non-weight bearing event due to the lack
of water dragMale Rowers are split into only 2 weight classes
light, < 74.8kg, and heavy, >74.8kg. This leaves anyone well under or just above the light weight limit with little to no chance of winning.
Rowers are also split into age groups of <30, 30-39, 40-49, 50-59, 60-69, 70-79, and >80.
The <30 age group contains the overwhelming majority and the older age groups have very few participants.
Theoretical ApproachRS3 ~ BW⅔
(fan law)
RS ~ BW2/9
H ~ BW⅓
RT ~ RS-1
RT ~ H-1
Age is adjusted because of rowing performance’s relationship with VO₂max
Why Height is ImportantGeneral physicsLeversLimb length
ProcedureBody mass and height were
measured before the event.The event was done in heats,
all using the rowing Concept IIC ergometer
Times were recorded from this event and the time, weight, and height were all studied through regression analysis
ResultsThe exponent for Height
was 0.937 +/- 0.12 T/H-1 = T*HAge was found to have an
exponent of 0.061 +/- 0.01
SS = T*H*A-0.06
This allows rowers to be compared regardless of height and age on the erg.
Results Comparison
SubjectTime
(s)Height
(m)Age (yr)
Old Rank
New Rank
T*H*A^-0.06
A 469 1.829 40 6 1 687.5
B 493.2 1.765 42 38 3 695.6
C 454 1.981 17 1 23 758.8
D 458.1 1.892 19 2 11 726.4
E 461.2 1.956 21 3 40 751.4
Norms for Height and AgePercentile Rank T*H T*H*A^-0.06
90 878.9 741.3
80 899.2 763.9
70 914 780.4
60 926.5 794.3
50 938 807.1
40 949.6 820
30 962 833.8
20 976.8 850.3
10 997.1 872.9
ConclusionTaller, heavier rowers are fasterOn rowing ergometers there is a bigger
advantage for height.Male rowers can be compared with no group
separation on their indoor rowing speed with the scaled score of T*H*A-0.06
This does not scale for who will be faster on the water
Scaling Rowing Ergometer Performance for on the Water
A 2008 study in Great BritainScaling for on the water rowing speed from
ergometer rowing speed uses body weightBW affects on the water rowing by adding
dragRowing ergometer results will show a greater
speed difference between heavyweights and lightweights than on the water rowing will
SourcesVanderburgh, Paul M., Frank I. Katch, Joseph
Schoenleber, Christos P. Balabinis, Robb Elliott. “Multivariate allometric scaling of men’s world indoor rowing championship performance.” Medicine and Science in Sports and Exercise. 1995.
Nevill A.M., C. Beech, R. L. Holder, M. Wyon. “Scaling concept II rowing ergometer performance for differences in body mass to better reflect rowing in water.” Scandinavian Journal of Medicine & Science in Sports. 2009.