Predicting Projected Frontal Area For Cycling In Women Competing At The 2004 Hawaiian Ironman Triathlon

Moss, Alin; Juergens, Cheryl A.; McKenzie, James M.; Ruby, Brent C.; Heil, Dan

doi:10.1249/00005768-200505001-00550

Cited by 1 publication

(2 citation statements)

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“…Triathletes are prohibited from riding behind another athlete during Ironman and other races, which would reduce drag forces (McCole et al, 1990). Therefore, to reduce the power required to travel a set speed, triathletes seek to improve aerodynamic profile by reducing frontal projected area (Moss et al, 2005). To reduce frontal area, triathletes have configured their bicycles to increase upper body flexion using aerobars to support their arms and hands and to ride with the knees close to the bicycle frame (Burke & Pruitt, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…pdf) to decrease the effect of drag forces (McCole, Claney, Conte, Anderson, & Hagberg, 1990). Therefore, triathletes tend to seek improvements in their aerodynamic profile by reducing their frontal projected area (Moss, Cheryl, McKenzie, Ruby, & Heil, 2005). This is achieved by moving the saddle further forward relative to the bottom bracket compared to road cyclists (Ricard, Hills-Meyer, Miller, & Michael, 2006) and moving the upper body further downwards to the handlebars.…”

Section: Introductionmentioning

confidence: 99%

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Cyclists and triathletes have different body positions on the bicycle

Bini

Hume

Croft

2012

European Journal of Sport Science

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Our study evaluated differences in body position on the bicycle for recreational cyclists, competitive cyclists and triathletes. Thirty-six recreational cyclists, 17 competitive road cyclists and 18 competitive triathletes were assessed for body position on their bicycles on a cycle trainer. Images were taken of cyclists/triathletes in static poses with the crank at the 3 o'clock and 6 o'clock positions. Trunk, pelvis, hip, knee and ankle angles, anterior-posterior and medio-lateral positions of the knees in relation to the pedal axis and frontal projected area were measured using ImageJ. Comparison of body position between groups (recreational, competitive road cyclists and competitive triathletes) was conducted using effects sizes (ES). The greatest differences between groups in the measured variables were observed between the triathletes and the other two groups. Smaller differences were observed between competitive and recreational cyclists. Competitive triathletes had greater body forward projection (10% greater trunk flexion and 66% knee anterior position, ES = 2.5 and 1.2, respectively) and less frontal projected area (17%, ES = 1.3) than competitive road cyclists for body position on the bicycle. Both recreational and competitive cyclists sat on their bicycles with their trunks in a more vertical position compared to triathletes. Guidelines for bicycle configuration for triathletes and road cyclists need to consider the body positions during events.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%