Απόσπασμα από το ROWING BIOMECHANICS Νοέμβριος 2010
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Transcript of Απόσπασμα από το ROWING BIOMECHANICS Νοέμβριος 2010
8/8/2019 Απόσπασμα από το ROWING BIOMECHANICS Νοέμβριος 2010
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awo TO ROWING BIOIVIECHANICS
2010
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v o l u m e 1 0 N O 1 1 6 Rowing S/o/r7ec/7a/7/cs Newsletter November 2010
News
The results of the recent W orld cham pion ships in
Karapiro, New Zealand (see Ap pendix 1 below) show
that the leaders, Great Britain have made their position
stronger: last year they won six medals in Olympic
events , one of them gold , but this year they w on ninemedals , four of them were gold . The Brits def in i te ly
intended to smash their opposi t ion dur ing their home
Olympics-2012.
The hosts of the c h a m p i o n s h i p s , N ew Zealand w on
seven medals in Oly mp ic events, three of them were
gold. This is one step up compare to the last year,
when th e «k iw i s» got "only" five meda ls .
The Aussies increased their rank from seventh place
last year to th i rd . They doubled th e amoun t of medals
compare to 2009 with four medals now, though no
gold among them, except gold Thomas Keller medal
awarded to the great James Tomkins .
T he Germans have fa l len from second place down to
fourth, with only three medals after five last year. This
bit ter fact was sweetened by the most prestigious gold
medal in M8+.
The Greeks un der wise leade rship of Gianni Post ig-
l ione increased the i r r ank f rom th e ni nth place last year
to the t i l th now . They got three medals, one more com-
pared to 2 U U y , tnougli no gold this year.
The Amer icans conc lude the six best countr ies of
the World with more poin tsm an Greeks , but with only
two medals, which is one less than last year.
Facts. Did you know that...
. . . u s ing EM G (electro-myography) is the best
method to study muscle activity in any human move-
m e n t ? A pilot s tudy was conducted on a mob ile rowin g
ergometer with the purpose to evaluate the sequence of
muscles act ivat ion d ur in g the stroke cycle. Three most
powerful muscle groups were chosen: quads (Rectus
femoris), hamstr ings (Biceps femoris and Semimem-
bmnosus) and gluts (Glutens medius). Delsys Myo-
monitor® wireless EM G system w as used and eight
electrodes were placed on r ight and left muscles of theabove g roups . Six samples were taken on a sculler of
an in te rnat ional level at the stroke rates 20, 24, 28, 32,
36 and 40 str /min. F ig . l below shows the EMG of
three major mu scle groups at 36str/min in conjunct ion
with velocities of the body segments.Activity of the quads began significant ly earlier than
the catch, because the row er needs to d ecelerate the relativ e
movements of the masses at the end of recovery an d thenstart their acceleration at the be g inn ing of the drive. It is
interesting that activation of the quads decreased down to
zero after th e legs achieved their maxim al velocity (mom ent
1 on Fig. l ) and the rower started using his t runk . Ham -strings an d gluts rapidly increase it s activation at this m o-
ment. This could be a specific feature of this rower as he
has a hump in the legs velocity curve at the same time,which may indicate a lack of coo rdina tion of activities of
the quads and hamstrings (RBN 2008/07). The pattern of
th e quads activation has three peaks during th e drive and the
second peak (moment 2) corresponds with the second peak
of legs velocity. The third peak of the quads activation oc-
curred at the finish of the dr ive - beginning of recovery hasthe highest electrical activity. This ca n be expla ined by a
hi p flexion action (rectus femoris is connected to the pelvis)and pulling the stretcher through, which requires straight
legs.
EMG Q ua ds(Rectus femoris)
EMG Hams
(Biceps feme
EMG Glut
(Glutens
2 Body Segm ents\/olr»r»it\ (fn/c -
Catch
T he peak of t runk veloci ty (moment 3) coincides
with the peak o f E M G o f hams t r ings and glu ts , which
produces the highest power during the drive through
rotation in hip joints.
It is noticeable that EM G curves are qui te asym-
metrical: left hamstr ing and g lu t produce higher e lec-
trical impulse at the middle of the drive, but rightquads do more at the finish of the drive . This cou ld be
related to a specific injury of the athlete.
Conc lud ing , EMG method shows a good corre-
spondence with mechanical variables of rowing and
m ay be used fo r evaluation of rower's technical ef-
fectiveness. The method requ i res further deve lopmen t
of the analys is rout ine based on various pat terns of
rowing technique both on-ergo and on-water.
Acknowledgment for the support of th is s tudy is
given to the English Ins t i tu te of Sport and Bri t i sh
Rowing .Contact U s:
©2010: Dr. Valery Kleshnev, www. biorow. com
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Appendix 1Ranking of the countries based on results in 14 Olympic events on the World Cham pionship 2010 in Karapiro
New Zealand and its comparison with results of 2009 World championship in Poznan, Poland.
^
Rank
2010
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Country
GBR
NZL
AUS
GER
GRE
USA
CAN
ITA
FRA
CZE
CHN
SWE
CRO
BLR
UKR
ROU
POL
NED
NOR
RUS
POR
SLO
SRB
Number of places 2010
1st
4
3
1
1
1
1
1
1
1
And
4
1
2
1
1
1
2
1
1
3rd
1
3
2
1
2
1
1
1
1
1
4th
2
3
2
1
1
2
1
2
5th
2
1
1
1
3
1
2
2
1
6th
2
3
1
2
1
1
1
1
1
1
7th
2
1
3
1
1
1
2
1
1
Medals
2010
9
7
4
3
3
2
2
2
2
1
1
1
1
1
1
1
1
0
0
0
0
0
0
Points
2010
75
54
38
39
16
25
22
20
16
16
15
9
8
6
6
6
5
10
8
5
2
2
2
Rank
2009
1
3
7
2
9
5
13
12
6
8
23
21
14
16
11
4
10
24
22
15
25
Medals
2009
6
5
2
5
2
3
1
1
2
2
0
0
0
11
2
4
2
0
0
0
10
Points2009
50
39
23
55
14
27
13
16
27
18
3
0
4
10
8
12
32
12
2
4
0
9
3
Red co lour means improvement ,
blue colour — decrease of results.