WATER FLOW DIRECTION AROUND THE UPPER LIMB IN FRONT CRAWL SWIMMING FOR PROPULSION MEASUREMENT: FLOW WITH STEADY OR UNSTEADY DIRECTION

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SADEGHI HEYDAR; AMINI H.R.; KHALAJI H.

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Journal Paper

Paper Information

Journal: JOURNAL OF MOVEMENT SCIENCE & SPORTS Year:2009 | Volume:6 | Issue:12 Page(s): 1-9

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Information Journal Paper

Title

WATER FLOW DIRECTION AROUND THE UPPER LIMB IN FRONT CRAWL SWIMMING FOR PROPULSION MEASUREMENT: FLOW WITH STEADY OR UNSTEADY DIRECTION

Author(s)

SADEGHI HEYDAR | AMINI H.R. | KHALAJI H. | Issue Writer Certificate

Keywords

WATER DYNAMIC BEHAVIORQ3

AXIAL FLOWQ3

UPPER LIMB ROTATIONAL MOVEMENTQ3

FRONT CRAWL SWIMMINGQ3

PRESSURE GRADIENTQ3

Abstract

Success in performing swimming skills, besides having proper physical features need knowledge of biomechanical factors such as propulsion, drag force and propulsion efficiency(1). This survey aims at investigating the effect of rotational movement of upper limbs on WATER DYNAMIC BEHAVIOR (direction and flow velocity) in FRONT CRAWL SWIMMING. 3 young elite swimmers participate in this study as a subject. Tow camera that moves with subjects velocity recorded movement direction of black woolen tufts were tied to forearm and hand of swimmer and tufts direction demonstrated flow direction. The pressure on different parts of limbs was measured by some sensors (FSR ). The pressure data filtered with thread degree polynomial in excel. Findings showed that rotational movement of upper limbs caused PRESSURE GRADIENT in the limbs length, at the end phase of in sweep and out sweep movement phase. The direction of this gradient is from shoulder toward arm. Existing gradient is opposite of movement velocity, and considering in swimmers, upper limbs the movement of arm is more than that of shoulder, where we have more velocity there is less pressure. And where movement velocity is less, there is more pressure. Findings showed that the same throughout upper limbs in water. Findings of this study question the hypotheses of measuring propulsion through movement analyzing method in a specific direction and its truthfulness.

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