Objective: To determine the relationship between success at peak performance age and and compare the between swimming and track running by determining probability of becoming an international-class female athlete based on the number of different race distances the athletes compete in each year throughout their development process.
Methods: Race times of female Tier 2 to Tier 5 freestyle pool swimmers ( = 2,778) and track runners ( = 9,945) were included in the present study. All athletes were ranked according to their personal best at peak performance age. Subsequently, number of different race distances during each year were retrospectively extracted from peak performance to early junior age. Personal best performance points at peak performance age were correlated with the number of different race distances across the various age categories. Poisson distribution determined the dose-time-effect of becoming an international-class athlete based on the number of different swimming strokes.
Results: At peak performance age, correlation analysis showed a larger within-sport distance variety for higher ranked athletes, particularly for track runners ( ≤ 0.35, < 0.001). Despite reaching statistical significance, the effects were small to moderate. While swimmers showed a generally larger within-sport distance variety than track runners, Poisson distribution revealed a dose-time-effect for the probability of becoming an international-class swimmer. Sprint and middle-distance swimmers benefit from competing in three race distances during junior age and a transition to two race distances at 17-18, 18-19, 20-21 and 25-26 years of age for 50 m, 100 m, 200 m and 400 m races, respectively. Long-distance swimmers should maintain three different race distances throughout peak performance age. Probability analysis showed a consistent benefit of competing in one or two race distances for 100 m, 200 m, 400 m and 800 m track runners.
Conclusion: Within-sport distance variety is not a continuum but an ever-evolving process throughout the athletes' careers. While swimmers generally show larger variety than track runners, the progressive specialization towards peak performance age improves success chances to become an international-class swimmer.
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http://dx.doi.org/10.3389/fspor.2024.1502758 | DOI Listing |
Eur J Appl Physiol
December 2024
Sports Performance Research Institute New Zealand, Auckland University of Technology, Auckland, New Zealand.
Purpose: To determine the effect of carbohydrate ingestion during prolonged exercise on durability of the moderate-to-heavy-intensity transition and severe-intensity performance.
Methods: Twelve trained cyclists and triathletes (10 males, 2 females; peak, 59 ± 5 mL kg min; training volume, 14 ± 5 h week) performed an incremental test and 5-min time trial (TT) without prior exercise (PRE), and after 150 min of moderate-intensity cycling, with (POST) and without (POST) carbohydrate ingestion.
Results: Power output at the first ventilatory threshold (VT) was lower in POST (225 ± 36 W, ∆ -3 ± 2%, P = 0.
Eur J Appl Physiol
December 2024
Club Des Dauphins de Guilherand-Granges, 07500, Guilherand-Granges, France.
Purpose: This study aimed to investigate whether the variable dose-response model, with estimates free to vary over time, can account for overreaching during intensified training in swimmers.
Methods: A time-varying model using a recursive least squares algorithm was applied to data from eight swimmers collected over 61 weeks, comprising five training cycles. Each data set included daily training load calculated from pool kilometers and dry land training equivalents, and performance measured twice weekly from 50 m trials.
J Sci Med Sport
November 2024
World Rugby, Pty (Ltd), Ireland. Electronic address: https://twitter.com/Scienceofsport.
Objectives: To evaluate if the tackler correctly adhering, or not, to four different instructions of legal front-on one-on-one torso tackles altered the tackler and/or ball carrier peak inertial head kinematics.
Design: Controlled laboratory study.
Methods: Fifteen rugby-code players measured with three-dimensional optoelectronic motion capture performed two tackle instructions from the Australian National Rugby League coaching manual on under (Dominant National Rugby League) and over (Smother National Rugby League) the ball tackles, and two novel variants of these (under, Dominant, Torso Stick; over, Smother, Pop, Lock).
Int J Sports Physiol Perform
December 2024
Department of Service Sector Management, Sheffield Hallam University, Sheffield, United Kingdom.
Purpose: This study investigated the effect of an individualized sodium bicarbonate (SB) supplementation-timing strategy on 200-m and 400-m freestyle swimming time-trial (TT) performance.
Methods: Thirteen well-trained swimmers (8 men and 5 women; mean [SD] 22 [3] y, 1.76 [0.
J Colloid Interface Sci
December 2024
Electric Mobility and Tribology Research Group, Council of Scientific and Industrial Research Central Mechanical Engineering Research Institute, Mahatma Gandhi Avenue, Durgapur 713209, West Bengal, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-Human Resource Development Centre (CSIR-HRDC) Campus, Postal Staff College Area, Sector 19, Kamla Nehru Nagar, Ghaziabad 201002, Uttar Pradesh, India. Electronic address:
Rechargeable zinc-air batteries (ZABs) with high-performance and stability is desirable for encouraging the transition of the technology from academia to industries. However, achieving this balance remains a formidable challenge, primarily due to the requirement of robust, earth-abundant reversible oxygen electrocatalyst. The present study introduces a simple strategy to synthesize Co-N rich nanoalloy with N-doped porous carbon tubes (NiCo@NPCTs).
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