Hydrodynamic Flow Characteristics of a Recirculating Pool: Examining the Ecological Validity for Training and Testing.

Autor:	Krajewski KT; Department of Sports Medicine and Nutrition, University of Pittsburgh, Pittsburgh, Pennsylvania., Beethe AZ; Perception-Action Laboratory, Department of Kinesiology and Health Science, Utah State University, Logan, Utah; and., Dever DE; Department of Sports Medicine and Nutrition, University of Pittsburgh, Pittsburgh, Pennsylvania., Johnson CD; Spaulding National Running Center, Department of Physical Medicine and Rehabilitation, Harvard Medical School, Cambridge, Massachusetts., Nindl BC; Department of Sports Medicine and Nutrition, University of Pittsburgh, Pittsburgh, Pennsylvania., Lovalekar MT; Department of Sports Medicine and Nutrition, University of Pittsburgh, Pittsburgh, Pennsylvania., Flanagan SD; Department of Sports Medicine and Nutrition, University of Pittsburgh, Pittsburgh, Pennsylvania., Connaboy C; Department of Sports Medicine and Nutrition, University of Pittsburgh, Pittsburgh, Pennsylvania.
Jazyk:	angličtina
Zdroj:	Journal of strength and conditioning research [J Strength Cond Res] 2023 Oct 01; Vol. 37 (10), pp. 2023-2031.
DOI:	10.1519/JSC.0000000000004500
Abstrakt:	Abstract: Krajewski, KT, Beethe, AZ, Dever, DE, Johnson, CD, Nindl, BC, Lovalekar, MT, Flanagan, SD, and Connaboy, C. Hydrodynamic flow characteristics of a recirculating pool: examining the ecological validity for training and testing. J Strength Cond Res 37(10): 2023-2031, 2023-Recirculating swimming flumes (RSFs) with elliptical multifeature designs have grown in popularity due to their multifunctionality for rehabilitation and training. Because of their smaller footprint, laboratories have adopted their use to investigate swimming and underwater treadmill running. However, little is known about the hydrodynamic characteristics of these RSFs and how they might influence outcomes. The purpose was to determine hydrodynamic flow characteristics of an RSF at the manufacturers' set "speeds" around the centroid of flow projection. Hydrodynamic velocity profiles were collected through a 3D profiling velocimeter, sampling at 200 Hz in an RSF. Data were collected 0.5 and 1.5 m from the projection channel at designated flume "speeds" of 30-95 (+99) in 5-unit increments. Velocity data were collected for 1 minute per trial (location × speed) to determine mean flow velocity (MFV) for 10, 20, 30, and 40 cm2 cross-sectional areas (CSAs). A two-way ANOVA was conducted comparing CSAs from the surface by distance from the current channel (4 × 2). Separate ANOVAs were conducted to assess differences in MFV across each CSA. Significant differences between flow CSAs indicated that MFV is less for a larger area at the same speed, indicative of variable and turbulent flow characteristics across the respective CSAs. Mean flow velocity was further diminished by distance from the flow channel as supported by the main effect, thus exposing an individual to variant flow velocities simultaneously. Limited stability of the flow velocity centroid could affect swim mechanics making the movement pattern no longer analogous to traditional pool and open water swimming, rather resembling swimming upstream in a river with turbulent flow. (Copyright © 2023 National Strength and Conditioning Association.)
Databáze:	MEDLINE
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