Facts. Did You Know That

Transcription

1 No 2 Volume 5 Rowing Biomechanics Newsletter February 2005 Facts. Did You Know That analysis of the stroke rate during the Olympic Games-2004 in Athens was conducted recently in similar way, as it was done for OG and WC-2002 (RBN 1,2/2003). The measurements were done for medal winners only using official video footage. It was measured around 70% of the total number of strokes. The data was filtered and compared with official split and final times. average stroke rate of the medal winners in the last Olympics was.86spm. The same parameter in the Olympics-2000 was.07spm, and in the Worlds-2002 it was.19spm. So, we can see small decrease in the average stroke rate; since the average stroke rate increased in small boats: singles, doubles and pairs, except LW2x. Medal winners in nig boats (quads, fours and eights) had a lower stroke rate. Average stroke rate over 2000m in medalists of OG-2000, WC-2002 and OG W1x M1x W2- M2- W2x M2x M LW2x LM2x LM4- W4x M4x W8+ M the previous fact affected the trend line of the Rate/Speed dependence, which became higher for low speeds (small boats) and lower for high speed (big boats): 30 Stroke Rate (spm) Boat Speed (m/s) the winners had higher variation (ratio of the standard deviation to the average over four sections of the race) of the stroke rate (5.1%), than silver (4.7%) and bronze medalists (4.0%). This tells us that the winners can spurt at high rate at the start and finish of the race, but they have lower rate at cruising speed; on average, the winners had about 1spm lower stroke rate (.3) than silver (.3) and bronze medalists (.2). This difference was the most significant in winners in LM2x (3.8spm lower than 2 nd place and 2.6 spm lower than 3 rd place), W2- (2.5 and 1.4) and W2x (1.7 and 4.4); crews from the main rowing countries performed differently in regards of stroke rate:,, and USA usually have a stroke rate below the trend line, with longer DPS., FRA, and emphasized a higher stroke rate and a shorter DPS Deviation of Stroke Rate from the trend line (spm) USA FRA below are the graphs of the boat speed, rate and DPS averaged in medal winners for each of four sections of the race: Boat Speed (m/s) Stroke Rate (spm) Gold Silver Bronze 500м Sections It is obvious, that the winners had significantly longer DPS, especially in the middle of the race. You can find details of the stroke rate analysis for each medal winner in the Appendix 1. References 1. Kleshnev V Stroke Rate vs. Distance in Rowing during the Sydney Olympics. Australian Rowing. 25(2), Contact Us: 2003 Dr. Valery Kleshnev, AIS/Biomechanics tel. (+61 2) , (m) , fax: kleshnevv@ausport.gov.au

2 Appendix 1 to the Rowing Biomechanics Newsletter 2(5), February Boat speed, stroke rate and distance per stroke in the medalists of the Olympic Games in Athens. W1x 1 1: : : : : BLR 1: : :51. 1: : BUL 1: :53. 1: : : BLR BUL BLR BUL M1x 1 NOR 1:.77 1:.63 1:.02 1:.88 6: EST 1:.64 1:. 1:.92 1:. 6:51. 3 BUL 1:. 1:.00 1:.59 1:.80 6: NOR EST BUL NOR EST BUL W2-1 1:.03 1: : : : :.53 1: : : : BLR 1:.21 1: : : : BLR BLR M2-1 1:.68 1:. 1:.03 1:.68 6: CRO 1:.57 1:.09 1:.69 1:.29 6:.64 3 RSA 1:.93 1:.06 1:.75 1:.66 6: CRO RSA CRO RSA BLR BUL 0:00.0 1:52.5 3:45.0 5:.5 7:30.0 NOR EST BUL 0:00.0 1:45.0 3:30.0 5:15.0 7:00.0 BLR 0:00.0 1:47.5 3:.0 5:22.5 7: CRO RSA 0:00.0 1:.0 3:20.0 5:00.0 6:.0

3 W2x 1 NZL 1:.89 1: : : : :.58 1: : :.95 7: :.09 1: : : : NZL NZL M2x 1 FRA 1:.63 1:.83 1:.85 1:.69 6: SLO 1:.99 1:.75 1:.90 1:.08 6: :.58 1:.16 1:.20 1:.99 6:.93 1 FRA SLO FRA SLO M4-1 1: :.68 1:.04 1: : CAN 1:28. 1:.71 1:.09 1: : : :. 1:.05 1:.01 6: CAN CAN LW2x 1 1:.27 1:.57 1: :.21 6: :.84 1:45. 1: :.27 6: :.11 1: : :.08 6: NZL 31 0:00.0 1:47.5 3:.0 5:22.5 7: FRA SLO 0:00.0 1:.0 3:20.0 5:00.0 6:.0 CAN 0:00.0 1:.0 3:10.0 4:45.0 6:20.0 0:00.0 1:45.0 3:30.0 5:15.0 7:00.0

4 LM2x 1 POL 1: :.69 1:.57 1:.04 6: FRA 1:. 1:.98 1:.23 1:.83 6: GRE 1:.80 1:.58 1:.71 1:.14 6: POL FRA GRE POL FRA GRE LM4-1 DEN 1:26. 1: :. 1: : : :31. 1:.25 1: : : : :.27 1:. 6: DEN DEN W4x 1 1:.63 1:.58 1:.58 1:.50 6: :.81 1:.13 1:.84 1:.48 6: :.16 1:.97 1:.73 1:.87 6: M4x Speed over the section (m:s) 1 RUS 1: : : :29. 5: CZE 1: : : : :57. 3 UKR 1: : :.14 1: : RUS CZE UKR RUS CZE UKR POL FRA GRE 0:00.0 1:.5 3:15.0 4:52.5 6: DEN 0:00.0 1:.5 3:05.0 4:.5 6:10.0 0:00.0 1:.0 3:20.0 5:00.0 6:.0 RUS CZE UKR 0:00.0 1:30.0 3:00.0 4:30.0 6:00.0

5 W8+ 1 1:.49 1:.67 1:.26 1:.28 6: USA 1:.24 1:.66 1:. 1:.31 6: :.53 1:.55 1:.74 1:.03 6: USA USA M8+ 1 USA 1: : : : : : : : : : : : : : :45. 1 USA USA USA 0:00.0 1:.0 3:10.0 4:45.0 6: USA 0:00.0 1:27.5 2:55.0 4:22.5 5:50.0