Purpose: This study aimed at evaluating the effect of level of competition and drill typology on loads during the preseason period in male volleyball players.
Methods: Internal (percentage of peak heart rate [HR] and summated HR zone) and external (PlayerLoad per minute, total and high accelerations per minute [tACCmin and hACCmin], decelerations per minute [tDECmin and hDECmin], and jumps per minute [tJUMPmin and hJUMPmin]) loads were monitored across a 5-week preseason period in 12 Division 1 (age: 22.5 [3.9] y; stature: 188 [6.2] cm; body mass: 85 [11.6] kg; training experience: 9.4 [4.2] y) and 12 Division 2 (age: 20.7 [2.9] y; stature: 186 [6.2] cm; body mass: 77.8 [9.6] kg; training experience: 5.6 [2.3] y) male volleyball players. Furthermore, differences in load were assessed for each drill typology (warm-up, conditioning, technical, tactical, and integral).
Results: No effects (P > .05) of level of competition on the internal (except for summated HR zone, P = .05) and external loads (except for tJUMPmin, P = .002) were found. Differently, drill typologies showed an effect (P < .001) on all the investigated internal- and external-load measures. The main post hoc results revealed higher (P < .05) percentage of peak HR, summated HR zone, PlayerLoad per minute, and tACCmin in warm-up and conditioning drills, while higher (P < .05) hDECmin and hJUMPmin were found in tactical and integral drills.
Conclusions: These results suggest that volleyball coaches use warm-up and conditioning drills when aiming at increasing the internal loads, PlayerLoad per minute, and tACCmin, while tactical and integral drills should be preferred to enhance the number of hDECmin and hJUMPmin.
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http://dx.doi.org/10.1123/ijspp.2023-0247 | DOI Listing |
Anal Chim Acta
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School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, PR China; Department of Chemistry, Sungkyunkwan University, Suwon, 16419, Republic of Korea. Electronic address:
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Lerner Children's Pavilion, Hospital for Special Surgery, New York, NY, USA. Electronic address:
Background: Humeral capitellar osteochondritis dissecans (OCD) lesions can be challenging to treat. Past studies have demonstrated grafting with extracellular matrix with bone marrow aspirate concentrate (ECM-BMAC) to be a viable technique for treatment of talar dome OCD, though little literature exists regarding application of this technique to the capitellum. This study aimed to report patient-reported outcomes (PROs) and return to sport (RTS) of pediatric patients at ≥1-year postoperatively who underwent ECM-BMAC grafting for capitellar OCD lesions.
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School of Economics and Management, Harbin Institute of Technology (Shenzhen), Shenzhen, China. Electronic address:
Motivated by increasingly strengthened market-based environmental regulations, enterprises intend to pursue both pollution reduction and competitive edge through developing green innovation. Although the volume of green innovation has increased substantially, some of them are not successfully commercialized to pay rewards for enterprises. Hence, how market-based environmental regulations affect enterprise green innovation commercialization is urgently to be explored.
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Laboratory of Environmental Toxicology, Chulabhorn Research Institute, Bangkok 10210, Thailand; Center of Excellence on Environmental Health and Toxicology (EHT), OPS, Ministry of Higher Education, Science, Research and Innovation, Bangkok, Thailand. Electronic address:
2-Ethylhexyl diphenyl phosphate (EHDPP) is a replacement flame-retardant commonly found in several environmental matrices and human biospecimens. Although some adverse effects of EHDPP have been identified, the endocrine-disrupting effects of EHDPP and its key metabolites on the human estrogen receptor (ER) are largely unknown. Herein, we report for the first time that EHDPP, at concentrations found in the environment and humans, significantly promoted estrogenic activity and synergized with 17β-estradiol-induced ER transactivation.
View Article and Find Full Text PDFAquat Toxicol
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Department of Biology, Concordia University, 7141 Sherbrooke St. West, Montreal, Québec H4B 1R6, Canada.
Microplastics, particles between 0.001 and 5 mm in diameter, are ubiquitous in the environment and their consumption by aquatic organisms is known to lead to a variety of adverse effects. However, studies on the effects of microplastics on prey fish have not shown consistent trends, with results varying across species and plastic type used.
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