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Teixeira JE, Forte P, Ferraz R, Branquinho L, Morgans R, Silva AJ, Monteiro AM, Barbosa TM. Resultant equations for training load monitoring during a standard microcycle in sub-elite youth football: a principal components approach. PeerJ 2023; 11:e15806. [PMID: 37554335 PMCID: PMC10405799 DOI: 10.7717/peerj.15806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 07/07/2023] [Indexed: 08/10/2023] Open
Abstract
Applying data-reduction techniques to extract meaningful information from electronic performance and tracking systems (EPTS) has become a hot topic in football training load (TL) monitoring. The aim of this study was to reduce the dimensionality of the internal and external load measures, by a principal component approach, to describe and explain the resultant equations for TL monitoring during a standard in-season microcycle in sub-elite youth football. Additionally, it is intended to identify the most representative measure for each principal component. A principal component analysis (PCA) was conducted with a Monte Carlo parallel analysis and VariMax rotation to extract baseline characteristics, external TL, heart rate (HR)-based measures and perceived exertion. Training data were collected from sixty sub-elite young football players during a 6-week training period using 18 Hz global positioning system (GPS) with inertial sensors, 1 Hz short-range telemetry system, total quality recovery (TQR) and rating of perceived exertion (RPE). Five principal components accounted for 68.7% of the total variance explained in the training data. Resultant equations from PCA was subdivided into: (1) explosiveness, accelerations and impacts (27.4%); (2) high-speed running (16.2%); (3) HR-based measures (10.0%); (4) baseline characteristics (8.3%); and (5) average running velocity (6.7%). Considering the highest factor in each principal component, decelerations (PCA 1), sprint distance (PCA 2), average HR (PCA 3), chronological age (PCA 4) and maximal speed (PCA 5) are the conditional dimension to be considered in TL monitoring during a standard microcycle in sub-elite youth football players. Current research provides the first composite equations to extract the most representative components during a standard in-season microcycle in sub-elite youth football players. Futures research should expand the resultant equations within training days, by considering other well-being measures, technical-tactical skills and match-related contextual factors.
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Affiliation(s)
- José Eduardo Teixeira
- Research Centre in Sports, Health and Human Development, Covilhã, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança, Bragança, Portugal
- Department of Sport Sciences, Polytechnic Institute of Guarda, Guarda, Portugal
| | - Pedro Forte
- Research Centre in Sports, Health and Human Development, Covilhã, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança, Bragança, Portugal
- CI-ISCE Douro, Higher Institute of Educational Sciences of the Douro, Penafiel, Portugal
| | - Ricardo Ferraz
- Research Centre in Sports, Health and Human Development, Covilhã, Portugal
- Department of Sport Sciences, University of Beira Interior, Covilhã, Portugal
| | - Luís Branquinho
- Research Centre in Sports, Health and Human Development, Covilhã, Portugal
- CI-ISCE Douro, Higher Institute of Educational Sciences of the Douro, Penafiel, Portugal
| | - Ryland Morgans
- Institute for Coaching and Performance, University of Central Lancashire, Preston, United Kingdom
| | - António José Silva
- Research Centre in Sports, Health and Human Development, Covilhã, Portugal
- Sport Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - António Miguel Monteiro
- Research Centre in Sports, Health and Human Development, Covilhã, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança, Bragança, Portugal
| | - Tiago M. Barbosa
- Research Centre in Sports, Health and Human Development, Covilhã, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança, Bragança, Portugal
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Sampaio T, Marinho D, Teixeira JE, Oliveira J, Morais J. Clustering U-14 Portuguese regional team football players by lower limb strength, power, dynamic balance, speed and change of direction: understanding the field position factor. PeerJ 2023; 11:e15609. [PMID: 37483964 PMCID: PMC10362840 DOI: 10.7717/peerj.15609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 05/31/2023] [Indexed: 07/25/2023] Open
Abstract
Objectives The aim of this study was to cluster U-14 Portuguese regional team football players based on variables related to lower limb strength and power, dynamic balance, linear sprint, and change of direction. Method The sample consisted of 22 young male soccer players (13.83 ± 0.44 years). A set of variables related to lower limb strength and power, dynamic balance, linear sprint, and change of direction was measured. Results Overall, a non-significant field position was observed. The countermovement jump (p < 0.001, η2 = 0.73), squat jump (p < 0.001), and 30 m linear sprint (p = 0.001) were the main variables responsible for establishing the clusters. Cluster 1 was characterized by a high slalom, i.e., it took longer to complete the test (speed and change of direction) and a low composite score in the dynamic balance. Cluster 2 was characterized by high squat jump, countermovement jump, and reactive strength ratio (lower limb strength and power). Cluster 3 was characterized by low squat jump and countermovement jump (lower limb strength and power), and a high 30 m sprint, i.e., it took longer to complete the test (speed and change of direction). Based on the results of the territorial map, the clusters consisted of: (i) cluster 1: two forwards, one midfielder, and five defenders; (ii) cluster 2: three forwards, two midfielders, and two defenders, and; (iii) cluster 3: four midfielders and three defenders. Conclusions Players from different field positions composed the three clusters. There was no cluster composed exclusively of players of the same field position. The development of individualized and specific enrichment training programs should consider a cluster analysis, as the positional effect can be overlooked.
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Affiliation(s)
- Tatiana Sampaio
- Instituto Politécnico de Bragança, Bragança, Portugal
- Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), Covilhã, Portugal
| | - Daniel Marinho
- Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), Covilhã, Portugal
- University of Beira Interior, Covilhã, Portugal
| | - José Eduardo Teixeira
- Instituto Politécnico de Bragança, Bragança, Portugal
- Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), Covilhã, Portugal
- Instituto Politécnico da Guarda, Guarda, Portugal
| | - João Oliveira
- Instituto Politécnico de Bragança, Bragança, Portugal
- Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), Covilhã, Portugal
| | - Jorge Morais
- Instituto Politécnico de Bragança, Bragança, Portugal
- Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD), Covilhã, Portugal
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Forte P, Encarnação S, Monteiro AM, Teixeira JE, Hattabi S, Sortwell A, Branquinho L, Amaro B, Sampaio T, Flores P, Silva-Santos S, Ribeiro J, Batista A, Ferraz R, Rodrigues F. A Deep Learning Neural Network to Classify Obesity Risk in Portuguese Adolescents Based on Physical Fitness Levels and Body Mass Index Percentiles: Insights for National Health Policies. Behav Sci (Basel) 2023; 13:522. [PMID: 37503969 PMCID: PMC10376847 DOI: 10.3390/bs13070522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/07/2023] [Accepted: 06/19/2023] [Indexed: 07/29/2023] Open
Abstract
The increasing prevalence of overweight and obesity among adults is a risk factor for many chronic diseases and death. In addition, obesity among children and adolescents has reached unprecedented levels and studies show that obese children and adolescents are more likely to become obese adults. Therefore, both the prevention and treatment of obesity in adolescents are critical. This study aimed to develop an artificial intelligence (AI) neural network (NNET) model that identifies the risk of obesity in Portuguese adolescents based on their body mass index (BMI) percentiles and levels of physical fitness. Using datasets from the FITescola® project, 654 adolescents aged between 10-19 years old, male: 334 (51%), female: n = 320 (49%), age 13.8 ± 2 years old, were selected to participate in a cross-sectional observational study. Physical fitness variables, age, and sex were used to identify the risk of obesity. The NNET had good accuracy (75%) and performance validation through the Receiver Operating Characteristic using the Area Under the Curve (ROC AUC = 64%) in identifying the risk of obesity in Portuguese adolescents based on the BMI percentiles. Correlations of moderate effect size were perceived for aerobic fitness (AF), upper limbs strength (ULS), and sprint time (ST), showing that some physical fitness variables contributed to the obesity risk of the adolescents. Our NNET presented a good accuracy (75%) and was validated with the K-Folds Cross-Validation (K-Folds CV) with good accuracy (71%) and ROC AUC (66%). According to the NNET, there was an increased risk of obesity linked to low physical fitness in Portuguese teenagers.
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Affiliation(s)
- Pedro Forte
- CI-ISCE, Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança (IPB), 5300-253 Bragança, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
| | - Samuel Encarnação
- CI-ISCE, Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança (IPB), 5300-253 Bragança, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Department of Pysical Activity and Sport Sciences, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain
| | - António Miguel Monteiro
- Department of Sport Sciences, Instituto Politécnico de Bragança (IPB), 5300-253 Bragança, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
| | - José Eduardo Teixeira
- Department of Sport Sciences, Instituto Politécnico de Bragança (IPB), 5300-253 Bragança, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Department of Sport Sciences, Polytechnic Institute of Guarda, 6300-559 Guarda, Portugal
| | - Soukaina Hattabi
- CI-ISCE, Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- High Institute of Sports and Physical Education of Elkef, University of Jendouba, Kef 7100, Tunisia
| | - Andrew Sortwell
- School of Health Sciences and Physiotherapy, University of Notre Dame Australia, Sydney 2007, Australia
- Department of Sports Sciences, University of Beria Interior, 6201-001 Covilhã, Portugal
| | - Luís Branquinho
- CI-ISCE, Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
| | - Bruna Amaro
- CI-ISCE, Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
| | - Tatiana Sampaio
- Department of Sport Sciences, Instituto Politécnico de Bragança (IPB), 5300-253 Bragança, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
| | - Pedro Flores
- CI-ISCE, Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
| | - Sandra Silva-Santos
- CI-ISCE, Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- Research Center in Sports Performance, Recreation, Innovation and Technology (SPRINT-IPVC), Polytechnic Institute of Viana do Castelo, 4960-320 Viana do Castelo, Portugal
| | - Joana Ribeiro
- CI-ISCE, Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
| | - Amanda Batista
- CI-ISCE, Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
| | - Ricardo Ferraz
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Department of Sports Sciences, University of Beria Interior, 6201-001 Covilhã, Portugal
| | - Filipe Rodrigues
- ESECS-Polytechnic of Leiria, 2411-901 Leiria, Portugal
- Life Quality Research Center (CIEQV), 2040-413 Leiria, Portugal
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Encarnação S, Rodrigues F, Monteiro AM, Gouili H, Hattabi S, Sortwell A, Branquinho L, Teixeira JE, Ferraz R, Flores P, Silva-Santos S, Ribeiro J, Batista A, Forte PM. Obesity Status and Physical Fitness Levels in Male and Female Portuguese Adolescents: A Two-Way Multivariate Analysis. Int J Environ Res Public Health 2023; 20:6115. [PMID: 37372702 DOI: 10.3390/ijerph20126115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 04/26/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023]
Abstract
Obesity and decreasing fitness levels among the youth are growing concerns in Portugal, similar to other developed countries, with implications for health and psychomotor development. Understanding the influence of health determinants such as sex and age are crucial for developing effective public health strategies. This study aimed to analyze the association between sex and chronological age with obesity status and physical fitness in Portuguese adolescents. A total of 170 adolescents (85 males and 85 females) were evaluated for body mass index, abdominal adiposity, aerobic fitness, abdominal resistance, upper limb resistance, lower limb power, and maximal running speed in a 40 m sprint using the FITescola® physical fitness battery, a Portuguese government initiative. The general model, analyzed using Pillai's trace, showed a significant effect of age and sex on body mass index, abdominal circumference, aerobic fitness, abdominal resistance, upper limb resistance, lower limb power, and maximal running speed (V = 0.99, F (7) = 10,916.4, p < 0.001, partial η2, sex = 0.22; age = 0.43, sex and age interaction = 0.10). Boys had higher physical fitness levels than girls in most tests, but both sex groups had a significantly higher proportion of non-fit adolescents, with boys showing the highest number of participants classified as non-fit.
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Affiliation(s)
- Samuel Encarnação
- Department of Sports Sciences, Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
- Department of Sport Sciences, Instituto Politécnico de Bragança (IPB), 5300-253 Bragança, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Research Center of the Higher Institute of Educational Sciences of the Douro, (CI-ISCE), 4560-447 Penafiel, Portugal
| | - Filipe Rodrigues
- ESECS-Polytechnic of Leiria, 2411-901 Leiria, Portugal
- Life Quality Research Center (CIEQV), 2040-413 Leiria, Portugal
| | - António Miguel Monteiro
- Department of Sport Sciences, Instituto Politécnico de Bragança (IPB), 5300-253 Bragança, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
| | - Hatem Gouili
- High Institute of Sports and Physical Education of Elkef, University of Jendouba, Jendouba Kef 7100, Tunisia
| | - Soukaina Hattabi
- Research Center of the Higher Institute of Educational Sciences of the Douro, (CI-ISCE), 4560-447 Penafiel, Portugal
- High Institute of Sports and Physical Education of Elkef, University of Jendouba, Jendouba Kef 7100, Tunisia
- Higher Institute of Educational Sciences of the Douro, 4560-447 Penafiel, Portugal
| | - Andrew Sortwell
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- School of Nursing, Midwifery, Health Sciences and Physiotherapy, University of Notre Dame, Sydney 2007, Australia
| | - Luís Branquinho
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Research Center of the Higher Institute of Educational Sciences of the Douro, (CI-ISCE), 4560-447 Penafiel, Portugal
- Higher Institute of Educational Sciences of the Douro, 4560-447 Penafiel, Portugal
| | - José Eduardo Teixeira
- Department of Sport Sciences, Instituto Politécnico de Bragança (IPB), 5300-253 Bragança, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Department of Sport Sciences, Polytechnic Institute of Guarda, 6300-559 Guarda, Portugal
| | - Ricardo Ferraz
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Department of Sports Sciences, University of Beria Interior, 6201-001 Covilhã, Portugal
| | - Pedro Flores
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Research Center of the Higher Institute of Educational Sciences of the Douro, (CI-ISCE), 4560-447 Penafiel, Portugal
- Higher Institute of Educational Sciences of the Douro, 4560-447 Penafiel, Portugal
| | - Sandra Silva-Santos
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Research Center of the Higher Institute of Educational Sciences of the Douro, (CI-ISCE), 4560-447 Penafiel, Portugal
- Higher Institute of Educational Sciences of the Douro, 4560-447 Penafiel, Portugal
- Research Center in Sports Performance, Recreation, Innovation and Technology (SPRINT -IPVC), 4900-347 Viana do Castelo, Portugal
- Instituto Politécnico de Viana do Castelo (IPVC), 4900-347 Viana do Castelo, Portugal
| | - Joana Ribeiro
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Research Center of the Higher Institute of Educational Sciences of the Douro, (CI-ISCE), 4560-447 Penafiel, Portugal
- Higher Institute of Educational Sciences of the Douro, 4560-447 Penafiel, Portugal
| | - Amanda Batista
- Research Center of the Higher Institute of Educational Sciences of the Douro, (CI-ISCE), 4560-447 Penafiel, Portugal
- Higher Institute of Educational Sciences of the Douro, 4560-447 Penafiel, Portugal
| | - Pedro Miguel Forte
- Department of Sport Sciences, Instituto Politécnico de Bragança (IPB), 5300-253 Bragança, Portugal
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Research Center of the Higher Institute of Educational Sciences of the Douro, (CI-ISCE), 4560-447 Penafiel, Portugal
- Higher Institute of Educational Sciences of the Douro, 4560-447 Penafiel, Portugal
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Batista A, Forte P, Ribeiro J, Silva-Santos S, Neto ES, Rodrigues F, Teixeira JE, Ferraz R, Branquinho L. Physical Activity and Sedentary Behavior in Adults from Penafiel, Portugal: A Cross-Sectional Study. Behav Sci (Basel) 2023; 13:443. [PMID: 37366695 DOI: 10.3390/bs13060443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 05/19/2023] [Accepted: 05/20/2023] [Indexed: 06/28/2023] Open
Abstract
The aim of this study was to compare the physical activity (PA) and sedentary behavior (SB) levels of young and middle-aged adults living in and around the municipality of Penafiel and to determine whether they meet PA recommendations. The researchers used the "International Physical Activity Questionnaire" (IPAQ) to measure moderate to vigorous PA and time spent on sedentary behavior (high vs. low). A prospective observational cross-sectional sample of 1105 adults aged 18-63 years, living in the municipality of Penafiel and its surroundings (45% women, 55% men), was used. The results indicated that more than half of the population was inactive (53.8%) and sedentary (54.0%). Men were more likely to be sedentary (59.2%) and inactive (55.6%) than women (inactive: 51.7%, high SB: 47.7%). Regarding daily PA and SB levels, women had higher levels of walks (3.8 ± 2.3; p = 0.034) and vigorous PA (2.2 ± 1.8 min; p = 0.005) per days/week, as well as vigorous PA per minutes/week (75.4 ± 82.1 min; p = 0.034). The time spent on vigorous PA per day was also higher in women (26.2 ± 22.8 min; p = 0.030). However, men had higher values in walking minutes per day (26.3 ± 17.1 min; p = 0.030), SB for weekdays (429.2 ± 141.2 min; p = 0.001), SB for weekends (324.7 ± 163.7 min; p = 0.033) and time spent on SB per minutes/week (2795.6 ± 882.0 min; p = 0.001). The results also showed that the older the adults, the lower the frequency and total time of vigorous PA per week. Young adults (18-28 years) had higher levels of vigorous PA (p = 0.005) than the other age groups (29-39; 40-50 and 51-63 years). Finally, the study found no significant correlation between individual level factors, such as number of children, marital status and monthly income, and PA or SB. Conversely, a significant and negative correlation between SB and levels of PA was found, indicating that the higher the level of PA practice, the lower the SB level. The authors suggest that promoting new PA habits and healthy lifestyles is an important future challenge for sustainability and improving the quality of life in public health.
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Affiliation(s)
- Amanda Batista
- Department of Sports, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
| | - Pedro Forte
- Department of Sports, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
- Research Center in Sports Sciences, Health Sciences and Human Development, 5001-801 Covilhã, Portugal
- Department of Sports Sciences, Instituto Politécnico de Bragança, 5300-253 Bragança, Portugal
| | - Joana Ribeiro
- Department of Sports, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
| | - Sandra Silva-Santos
- Department of Sports, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
| | - Elmiro Silva Neto
- Department of Sports Sciences, Federal University of Bahia, Salvador 40210-630, Bahia, Brazil
| | - Filipe Rodrigues
- ESECS-Polytechnic of Leiria, 2411-901 Leiria, Portugal
- Life Quality Research Center, 2040-413 Leiria, Portugal
| | - José Eduardo Teixeira
- Research Center in Sports Sciences, Health Sciences and Human Development, 5001-801 Covilhã, Portugal
- Department of Sports Sciences, Instituto Politécnico de Bragança, 5300-253 Bragança, Portugal
- Polytechnic Institute of Guarda, 6300-559 Guarda, Portugal
| | - Ricardo Ferraz
- ESECS-Polytechnic of Leiria, 2411-901 Leiria, Portugal
- Department of Sport Sciences, University of Beira Interior, 6201-001 Covilhã, Portugal
| | - Luís Branquinho
- Department of Sports, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
- Research Center in Sports Sciences, Health Sciences and Human Development, 5001-801 Covilhã, Portugal
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Matos R, Moreira C, Alves E, Teixeira JE, Rodrigues F, Monteiro D, Antunes R, Forte P. Tactical Knowledge by Decision Making and Motor Efficiency of Young Football Players in Different Playing Positions during a Three-a-Side Small-Sided Game. Behav Sci (Basel) 2023; 13:bs13040310. [PMID: 37102824 PMCID: PMC10135667 DOI: 10.3390/bs13040310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 03/20/2023] [Accepted: 03/30/2023] [Indexed: 04/28/2023] Open
Abstract
The aim of this study was to compare the tactical knowledge of young football players in different playing positions during a three-a-side small-sided game (SSG). Observational data was collected from 71 players (M = 12.16; SD = 1.55 years): 11 goalkeepers, 22 defenders, 15 midfielders, and 23 forwards. In total, 4 min of three-a-side SSGs (GR + 3 vs. 3 + GR) were recorded to assess tactical performance using a digital camera (GoPro Hero 6® version 02.01). The SSGs were performed on a field with a constant area (36 × 27 m). Video analyses were performed using LongoMatch® version 1.5.9 to record football performance; we then assessed tactical performance by using the Football Tactical Assessment System (Fut-Sat). This instrument evaluates the average of well-defined action indexes for each game in decision making principle and motor skills, specifically: (i) Decision Making Index (DMI); (ii) Motor Effectiveness Index (MEI); (iii) Effectiveness Index (I). The indexes were calculated by the ratio between the correct actions and the total. The Kruskal-Wallis test was used to evaluate differences between playing positions. The results showed that tactical performance by principles seems to be significantly different according to playing position. Differences were found between defenders and forwards (H = -11.92; p = 0.03) and defenders and midfielders (H = -16.13; p = 0.01) in contention principle. In conclusion, tactical knowledge of training based on the principles of the game can help coaches and players better understand and predict each player's actions during the game.
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Affiliation(s)
- Rui Matos
- Department of Sport, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
| | - Carlos Moreira
- Department of Sport, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- Department of Sports Sciences, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
| | - Emília Alves
- Department of Sport, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- CI-ISCE, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- Research Centre in Physical Activity, Health, and Leisure, CIAFEL, 4200-450 Porto, Portugal
| | - José Eduardo Teixeira
- Department of Sport Science, Instituto Politécnico de Bragança, 5300-253 Bragança, Portugal
- Department of Sport Sciences, Polytechnic Institute of Guarda, 6300-559 Guarda, Portugal
- Research Center in Sports, Health, and Human Development, 6201-001 Covilhã, Portugal
| | - Filipe Rodrigues
- ESECS- Polytechnic of Leiria, 2411-901 Leiria, Portugal
- Life Quality Research Center, 2040-413 Leiria, Portugal
| | - Diogo Monteiro
- Research Center in Sports, Health, and Human Development, 6201-001 Covilhã, Portugal
- ESECS- Polytechnic of Leiria, 2411-901 Leiria, Portugal
| | - Raul Antunes
- ESECS- Polytechnic of Leiria, 2411-901 Leiria, Portugal
- Life Quality Research Center, 2040-413 Leiria, Portugal
| | - Pedro Forte
- Department of Sport, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- CI-ISCE, Higher Institute of Educational Sciences of the Douro, 4560-708 Penafiel, Portugal
- Department of Sport Science, Instituto Politécnico de Bragança, 5300-253 Bragança, Portugal
- Research Center in Sports, Health, and Human Development, 6201-001 Covilhã, Portugal
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Teixeira JE, Forte P, Ferraz R, Branquinho L, Silva AJ, Monteiro AM, Barbosa TM. Integrating physical and tactical factors in football using positional data: a systematic review. PeerJ 2022; 10:e14381. [PMID: 36405022 PMCID: PMC9671036 DOI: 10.7717/peerj.14381] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 10/21/2022] [Indexed: 11/16/2022] Open
Abstract
Background Positional data have been used to capture physical and tactical factors in football, however current research is now looking to apply spatiotemporal parameters from an integrative perspective. Thus, the aim of this article was to systematically review the published articles that integrate physical and tactical variables in football using positional data. Methods and Materials Following the Preferred Reporting Item for Systematic Reviews and Meta-analyses (PRISMA), a systematic search of relevant English-language articles was performed from earliest record to August 2021. The methodological quality of the studies was evaluated using the modified Downs and Black Quality Index (observational and cross-sectional studies) and the Physiotherapy Evidence Database (PEDro) scale (intervention studies). Results The literature search returned 982 articles (WoS = 495; PubMed = 232 and SportDiscus = 255). After screening, 26 full-text articles met the inclusion criteria and data extraction was conducted. All studies considered the integration of physical and tactical variables in football using positional data (n = 26). Other dimensions were also reported, such as psychophysiological and technical factors, however the results of these approaches were not the focus of the analysis (n = 5). Quasi-experimental approaches considered training sets (n = 20) and match contexts (n = 6). One study analysed both training and play insights. Small sided-games (SSG) were the most common training task formats in the reviewed studies, with only three articles addressing medium-sided (MSG) (n = 1) and large-sided games (LSG) (n = 2), respectively. Conclusions Among the current systematic review, the physical data can be integrated by player's movement speed. Positional datasets can be computed by spatial movement, complex indexes, playing areas, intra-team and inter-team dyads. Futures researches should consider applying positional data in women's football environments and explore the representativeness of the MSG and LSG.
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Affiliation(s)
- José Eduardo Teixeira
- Research Center in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal,Department of Sport Sciences and Physical Education, Instituto Politécnico de Bragança, Bragança, Portugal,Department of Sport Sciences, Polytechnic Institute of Guarda, Guarda, Portugal
| | - Pedro Forte
- Research Center in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal,Department of Sport Sciences and Physical Education, Instituto Politécnico de Bragança, Bragança, Portugal,Department of Sports, Higher Institute of Educational Sciences of the Douro, Penafiel, Portugal
| | - Ricardo Ferraz
- Research Center in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal,Sport Sciences Department, University of Beira Interior, Covilhã, Portugal
| | - Luís Branquinho
- Research Center in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal,Department of Sports, Higher Institute of Educational Sciences of the Douro, Penafiel, Portugal
| | - António José Silva
- Research Center in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal,University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - António Miguel Monteiro
- Research Center in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal,Department of Sport Sciences and Physical Education, Instituto Politécnico de Bragança, Bragança, Portugal
| | - Tiago M. Barbosa
- Research Center in Sports Sciences, Health Sciences and Human Development, Vila Real, Portugal,Department of Sport Sciences and Physical Education, Instituto Politécnico de Bragança, Bragança, Portugal
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da Encarnação SGA, Flores P, Magalhães D, Afonso G, Pereira A, Fonseca RB, Ribeiro J, Silva-Santos S, Teixeira JE, Monteiro AM, Ferraz R, Branquinho L, Forte P. The Influence of Abdominal Adiposity and Physical Fitness on Obesity Status of Portuguese Adolescents. Int J Environ Res Public Health 2022; 19:11213. [PMID: 36141486 PMCID: PMC9517613 DOI: 10.3390/ijerph191811213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/15/2022] [Accepted: 09/03/2022] [Indexed: 06/16/2023]
Abstract
The aim of this study was to verify the relationship between abdominal adiposity and physical fitness in the obesity status of Portuguese adolescents. BMI, abdominal adiposity, and physical fitness tests from the FITescola® were evaluated in a total of 654 Portuguese adolescents, aged 10-19 years old-male: n = 334 (51%), female: n = 320 (49%). For the final model, BMI was positively related with age (β = 0.25), abdominal adiposity (β = 0.313), horizontal jump (β = -0.100), 40 m maximal velocity (β = 0.274), and aerobic fitness (β = -0.250, R2 = 0.75, F = 382.2, and p = 0.0001). We conclude that higher age and abdominal adiposity are positively related with a higher adolescent BMI. Furthermore, lower horizontal jump distances and worse times on the 40 m maximal velocity were inversely related with a higher adolescent BMI, and lower aerobic fitness was inversely related with a higher adolescent BMI.
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Affiliation(s)
| | - Pedro Flores
- Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
| | - David Magalhães
- Agrupamento de Escolas de Vilela, 4580-651 Paredes, Portugal
| | - Gil Afonso
- Agrupamento de Escolas de Vilela, 4580-651 Paredes, Portugal
| | - Albino Pereira
- Agrupamento de Escolas de Vilela, 4580-651 Paredes, Portugal
| | - Rui Brito Fonseca
- Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
| | - Joana Ribeiro
- Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
| | - Sandra Silva-Santos
- Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- Escola Superior de Desporto e Lazer, Instituto Politécnico de Viana do Castelo, 4900-347 Viana do Castelo, Portugal
| | - José Eduardo Teixeira
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Department of Sport Sciences, Polytechnic Institute of Bragança (IPB), 5300-253 Bragança, Portugal
| | - António Miguel Monteiro
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Escola Superior de Desporto e Lazer, Instituto Politécnico de Viana do Castelo, 4900-347 Viana do Castelo, Portugal
| | - Ricardo Ferraz
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Department of Sports Sciences, University of Beira Interior (UBI), 6201-001 Covilhã, Portugal
| | - Luís Branquinho
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
| | - Pedro Forte
- Research Centre in Sports Sciences, Health Sciences and Human Development (CIDESD), 5001-801 Vila Real, Portugal
- Higher Institute of Educational Sciences of the Douro (ISCE Douro), 4560-708 Penafiel, Portugal
- CI-ISCE/ISCE Douro, 4560-708 Penafiel, Portugal
- Department of Sport Sciences, Polytechnic Institute of Bragança (IPB), 5300-253 Bragança, Portugal
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Teixeira JE, Alves AR, Ferraz R, Forte P, Leal M, Ribeiro J, Silva AJ, Barbosa TM, Monteiro AM. Effects of Chronological Age, Relative Age, and Maturation Status on Accumulated Training Load and Perceived Exertion in Young Sub-Elite Football Players. Front Physiol 2022; 13:832202. [PMID: 35432006 PMCID: PMC9010324 DOI: 10.3389/fphys.2022.832202] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 03/07/2022] [Indexed: 01/12/2023] Open
Abstract
The aims of this study were 1) to analyze the influence of chronological age, relative age, and biological maturation on accumulated training load and perceived exertion in young sub-elite football players and 2) to understand the interaction effects amongst age grouping, maturation status, and birth quartiles on accumulated training load and perceived exertion in this target population. A 6-week period (18 training sessions and 324 observation cases) concerning 60 young male sub-elite football players grouped into relative age (Q1 to Q4), age group (U15, U17, and U19), and maturation status (Pre-peak height velocity (PHV), Mid-PHV, and Post-PHV) was established. External training load data were collected using 18 Hz global positioning system technology (GPS), heart-rate measures by a 1 Hz short-range telemetry system, and perceived exertion with total quality recovery (TQR) and rating of perceived exertion (RPE). U17 players and U15 players were 2.35 (95% CI: 1.25–4.51) and 1.60 (95% CI: 0.19–4.33) times more likely to pertain to Q1 and Q3, respectively. A negative magnitude for odds ratio was found in all four quartile comparisons within maturation status (95% CI: 6.72–0.64), except for Mid-PHV on Q2 (95% CI: 0.19–4.33). Between- and within-subject analysis reported significant differences in all variables on age group comparison measures (F = 0.439 to 26.636, p = 0.000 to 0.019, η2 = 0.003–0.037), except for dynamic stress load (DSL). Between-subject analysis on maturity status comparison demonstrated significant differences for all training load measures (F = 6.593 to 14.424, p = 0.000 to 0.037, η2 = 0.020–0.092). Interaction effects were found for age group x maturity band x relative age (Λ Pillai’s = 0.391, Λ Wilk’s = 0.609, F = 11.385, p = 0.000, η2 = 0.391) and maturity band x relative age (Λ Pillai’s = 0.252, Λ Wilk’s = 0.769, F = 0.955, p = 0.004, η2 = 0.112). Current research has confirmed the effects of chronological age, relative age, and biological maturation on accumulated training load. Perceived exertion does not seem to show any differences concerning age group or maturity status. Evidence should be helpful for professionals to optimize the training process and young football players’ performance.
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Affiliation(s)
- José Eduardo Teixeira
- Research Centre in Sports Sciences, Health and Human Development, Vila Real, Portugal
- Department of Sports, Exercise and Health Sciences, University of Trás-os-Montes e Alto Douro, Vila Real, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança, Bragança, Portugal
- *Correspondence: José Eduardo Teixeira,
| | - Ana Ruivo Alves
- Research Centre in Sports Sciences, Health and Human Development, Vila Real, Portugal
- Department of Sport Sciences, University of Beira Interior, Covilhã, Portugal
| | - Ricardo Ferraz
- Research Centre in Sports Sciences, Health and Human Development, Vila Real, Portugal
- Department of Sport Sciences, University of Beira Interior, Covilhã, Portugal
| | - Pedro Forte
- Research Centre in Sports Sciences, Health and Human Development, Vila Real, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança, Bragança, Portugal
- Department of Sports, Douro Higher Institute of Educational Sciences, Penafiel, Portugal
| | - Miguel Leal
- Department of Sports, Douro Higher Institute of Educational Sciences, Penafiel, Portugal
| | - Joana Ribeiro
- Department of Sports, Douro Higher Institute of Educational Sciences, Penafiel, Portugal
| | - António J. Silva
- Research Centre in Sports Sciences, Health and Human Development, Vila Real, Portugal
- Department of Sports, Exercise and Health Sciences, University of Trás-os-Montes e Alto Douro, Vila Real, Portugal
| | - Tiago M. Barbosa
- Research Centre in Sports Sciences, Health and Human Development, Vila Real, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança, Bragança, Portugal
| | - António M. Monteiro
- Research Centre in Sports Sciences, Health and Human Development, Vila Real, Portugal
- Department of Sport Sciences, Instituto Politécnico de Bragança, Bragança, Portugal
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Forte P, Sousa N, Teixeira JE, Marinho DA, Monteiro AM, Bragada JA, Morais JE, Barbosa TM. Aerodynamic analysis of human walking, running and sprinting by numerical simulations. Acta Bioeng Biomech 2022. [DOI: 10.37190/abb-02019-2022-06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Purpose
The drag in walking, running, and sprinting locomotion can be assessed by analytical procedures and experimental techniques. However, assessing the drag variations by these three main locomotion’s (i.e., walking, running, and sprinting) were not found using computational fluid dynamics. (CFD). Thus, the aim of this study was two-fold: (1) to assess the aerodynamics of human walking, running, and sprinting by CFD technique; 2) compare such aerodynamic characteristics between walking and running.
Methods
Three 3D models were produced depicting the walking, running, and sprinting locomotion techniques, converted to computer aided design models and meshed. The drag varied with locomotion type.
Results
Walking had the lowest drag, followed-up by running and then sprinting. At the same velocities, the drag was larger in walking than in running and increased with velocity.
Conclusions
In conclusion, drag varied with locomotion type. Walking had the lowest drag, followed-up by running and then sprinting. At the same velocities, the drag was larger in walking than in running and increased with velocity.
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Abstract
Purpose
This paper aims to investigate the role of resource orchestration in turnaround attempts following the organizational decline in the context of an emerging economy.
Design/methodology/approach
Multicase study of three Brazilian textile firms, following their trajectory from 1997 to 2009. We did a “historical reconstruction using the methodology” proposed by Mintzberg and McHugh (1985) to guide our data collection and analysis procedures. The methodology is geared towards the study of the evolution of organizations over a past period, wherein the researcher reconstructs the events after they have occurred, having developed them from documentary analysis and oral history.
Findings
The results indicate that resource orchestration is a critical capability for ensuring the coordinated implementation of operational and strategic actions in a turnaround. Moreover, in a context involving severe environmental jolts, the conservation of organizational slack appears to influence the effectiveness of resource orchestration and explains the different outcomes the firms in this study achieved in their turnaround attempts.
Research limitations/implications
This paper may be useful to practitioners involved in turnarounds, helping them evaluate the consequences of decisions involving the acquisition, reconfiguration, bundling and divestment of firm resources.
Practical implications
Besides contributing to the advancement of theory-informed research on decline and turnaround, this paper may be useful to practitioners involved in turnarounds, when they consider the consequences of decisions involving firm resources.
Originality/value
This paper helps advance theory-informed research on decline and turnaround in developing economies, helping address a gap in the extant literature, primarily focused on firms in developed countries.
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Jumani RS, Bessoff K, Love MS, Miller P, Stebbins EE, Teixeira JE, Campbell MA, Meyers MJ, Zambriski JA, Nunez V, Woods AK, McNamara CW, Huston CD. A Novel Piperazine-Based Drug Lead for Cryptosporidiosis from the Medicines for Malaria Venture Open-Access Malaria Box. Antimicrob Agents Chemother 2018; 62:e01505-17. [PMID: 29339392 PMCID: PMC5913971 DOI: 10.1128/aac.01505-17] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 01/05/2018] [Indexed: 12/21/2022] Open
Abstract
Cryptosporidiosis causes life-threatening diarrhea in children under the age of 5 years and prolonged diarrhea in immunodeficient people, especially AIDS patients. The standard of care, nitazoxanide, is modestly effective in children and ineffective in immunocompromised individuals. In addition to the need for new drugs, better knowledge of drug properties that drive in vivo efficacy is needed to facilitate drug development. We report the identification of a piperazine-based lead compound for Cryptosporidium drug development, MMV665917, and a new pharmacodynamic method used for its characterization. The identification of MMV665917 from the Medicines for Malaria Venture Malaria Box was followed by dose-response studies, in vitro toxicity studies, and structure-activity relationship studies using commercial analogues. The potency of this compound against Cryptosporidium parvum Iowa and field isolates was comparable to that against Cryptosporidium hominis Furthermore, unlike nitazoxanide, clofazimine, and paromomycin, MMV665917 appeared to be curative in a NOD SCID gamma mouse model of chronic cryptosporidiosis. MMV665917 was also efficacious in a gamma interferon knockout mouse model of acute cryptosporidiosis. To determine if efficacy in this mouse model of chronic infection might relate to whether compounds are parasiticidal or parasitistatic for C. parvum, we developed a novel in vitro parasite persistence assay. This assay suggested that MMV665917 was parasiticidal, unlike nitazoxanide, clofazimine, and paromomycin. The assay also enabled determination of the concentration of the compound required to maximize the rate of parasite elimination. This time-kill assay can be used to prioritize early-stage Cryptosporidium drug leads and may aid in planning in vivo efficacy experiments. Collectively, these results identify MMV665917 as a promising lead and establish a new method for characterizing potential anticryptosporidial agents.
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Affiliation(s)
- R S Jumani
- Department of Medicine, University of Vermont Larner College of Medicine, Burlington, Vermont, USA
- Cellular, Molecular and Biomedical Sciences Graduate Program, University of Vermont, Burlington, Vermont, USA
| | - K Bessoff
- Department of Medicine, University of Vermont Larner College of Medicine, Burlington, Vermont, USA
| | - M S Love
- California Institute for Biomedical Research, La Jolla, California, USA
| | - P Miller
- Department of Medicine, University of Vermont Larner College of Medicine, Burlington, Vermont, USA
| | - E E Stebbins
- Department of Medicine, University of Vermont Larner College of Medicine, Burlington, Vermont, USA
| | - J E Teixeira
- Department of Medicine, University of Vermont Larner College of Medicine, Burlington, Vermont, USA
| | - M A Campbell
- Saint Louis University School of Medicine, St. Louis, Missouri, USA
| | - M J Meyers
- Saint Louis University School of Medicine, St. Louis, Missouri, USA
| | - J A Zambriski
- Paul G. Allen School for Global Animal Health, College of Veterinary Medicine, Washington State University, Pullman, Washington, USA
| | - V Nunez
- California Institute for Biomedical Research, La Jolla, California, USA
| | - A K Woods
- California Institute for Biomedical Research, La Jolla, California, USA
| | - C W McNamara
- California Institute for Biomedical Research, La Jolla, California, USA
| | - C D Huston
- Department of Medicine, University of Vermont Larner College of Medicine, Burlington, Vermont, USA
- Cellular, Molecular and Biomedical Sciences Graduate Program, University of Vermont, Burlington, Vermont, USA
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de Carvalho Lins CE, Pereira Crott LS, Teixeira JE, Barbosa JE. Reduced erythrocyte complement receptor type 1 in systemic lupus erythematosus is related to a disease activity index and not to the presence or severity of renal disease. Lupus 2016; 13:517-21. [PMID: 15352423 DOI: 10.1191/0961203304lu1053oa] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The present study investigated the expression of the complement receptor type 1 (CR1) on the membrane of erythrocytes (CR1/E) of patients with systemic lupus erythematosus (SLE) by flow cytometry. We found a significant reduction in CR1/E numbers in SLE patients (n 1/4 52), compared to controls (512 + 171 and 689 + 146, respectively, P 1/4 0.0001). Reduction was more pronounced in active disease patients. The mean CR1/E number observed in patients with inactive disease was 546 + 163 CR1/E, while active SLE patients presented a mean of 385 + 133 CR1/E(P 1/4 0.001). Patients with SLE with similar activity indexes tend to have similar CR1/E numbers, irrespective of disease severity. We also observed a trend to CR1/E reduction in severe nephritis patients. A small group of SLE patients with chronic renal failure and inactive disease showed CR1/E numbers nearly identical to controls (689 + 146 versus 686 + 123, respectively, P 1/4 0.95). This was the only group of SLE patients with normal CR1/E numbers. These results confirm the CR1/E reduction in SLE patients as previously described, and also suggest that this reduction is related to disease activity and not to disease severity.
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Nogawa Fonzar-Marana RR, Ferriani RA, Soares SG, Cavalcante-Neto FF, Teixeira JE, Barbosa JE. Expression of complement system regulatory molecules in the endometrium of normal ovulatory and hyperstimulated women correlate with menstrual cycle phase. Fertil Steril 2006; 86:758-61. [PMID: 16831436 DOI: 10.1016/j.fertnstert.2006.02.095] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2005] [Revised: 02/11/2006] [Accepted: 02/11/2006] [Indexed: 10/24/2022]
Abstract
The present study describes the temporal expression of complement regulatory molecules membrane cofactor protein (MCP), decay accelerating factor (DAF), CR1, and CD59 in the human endometrium throughout the normal menstrual cycle and in patients submitted to ovarian hyperstimulation. During its proliferative phase, the endometrium expresses MCP, with increased expression during the secretory phase. Phase-dependent expression also was observed for DAF and CD59, mainly in the secretory phase. Expression of CR1 was not detected. These results suggest the presence of complement system activity during the menstrual cycle, with greater expression of regulatory molecules during the secretory phase to protect the epithelial integrity of human endometrium.
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Abstract
PURPOSE To evaluate the functional activity of the classical and alternative pathways of the complement system and the levels of C3, C4, and factor B during the first episode of meningococcal infection and during the convalescence period. PATIENTS AND METHODS Ten Brazilian children ranging in age from 8 months to 8 years, admitted from 1991 to 1993 with a clinical-laboratory diagnosis of meningococcal meningitis, were studied during acute infection (up to 7 days from diagnosis) and during the convalescence period (1 to 6 months after the acute episode). C3, C4, and Factor B were measured using nephelometry, and the lytic activity of classical and alternative pathways were evaluated by a kinetic method and expressed as the time needed to lyse 50% of an erythrocyte suspension (T1/2, expressed in seconds). Low T1/2 values for classical and alternative pathways correlate with high activities of the classical and alternative complement pathways, respectively. RESULTS A significant difference was observed between the alternative pathway lytic activity during infection and the convalescence period (282 vs 238 seconds, respectively, P = .01). No differences were detected in the other complement parameters analyzed. CONCLUSIONS In the presence of meningococcal meningitis, the alternative pathway is preferentially activated. This is probably due to the greater ability of the meningococcal endotoxin to activate this pathway in vivo.
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Affiliation(s)
- Pérsio Roxo Júnior
- Department of Pediatrics, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
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Teixeira JE, Martinez R, Câmara LM, Barbosa JE. Expression of complement receptor type 1 (CR1) on erythrocytes of paracoccidiodomycosis patients. Mycopathologia 2002; 152:125-33. [PMID: 11811640 DOI: 10.1023/a:1013123721376] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Complement receptor type 1 (CR1) is a membrane glycoprotein that acts as a receptor for the C3b, iC3b and C4b fragments of complement. In primates, one function of erythrocytes is to promote safe clearance of immunocomplexes (IC) from the circulation through CR1. Theoretically, in diseases characterized by high levels of circulating IC, an erythrocyte CR1 (CR1/E) deficiency may favor IC deposition in tissues or facilitate inappropriate activation of leukocytes in the circulation. Depression of the cell immune response occurs in paracoccidioidomycosis (PCM), especially in the more severe cases, and is frequently associated with high serum IC levels. In the present study we quantified the number of CR1/E in patients with the acute and chronic forms of PCM before and after treatment and correlated it with serum IC levels and CD4+ and CD8+ T cell concentration in the peripheral blood of these patients. Patients with PCM, particularly those with active disease and who had received treatment for shorter periods of time, had low numbers of CR1/E. In addition, an increase in serum IC concentration and a reduction in the CD4+/CD8+ T cell ratio were observed. After treatment there was a significant increase in mean CR1/E number and a reduction in serum IC levels. In patients with the chronic form of the disease the CD4+/CD8+ T cell ratio tended to increase after treatment and was associated with increased CR1/E levels. These results suggest that the reduction in CR1/E observed in patients is a phenomenon acquired with the disease and that CR1 could play a role in the pathogenesis of PCM.
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Affiliation(s)
- J E Teixeira
- Department of Parasitology, Microbiology and Immunology, School of Medicine of Ribeirão Preto, University of São Paulo, Brazil
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Michelin MA, Crott LSP, Assis-Pandochi AI, Coimbra TM, Teixeira JE, Barbosa JE. Influence of the electric charge of the antigen and the immune complex (IC) lattice on the IC activation of human complement. Int J Exp Pathol 2002; 83:105-10. [PMID: 12084047 PMCID: PMC2517671 DOI: 10.1046/j.1365-2613.2002.00224.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In order to understand the mechanism of complement (C) activation by immune complexes (ICs), the anti-complementary effect of ICs containing cationized antigens was compared in vitro to that using ICs formed by native antigens. ICs were prepared with affinity-purified rabbit polyclonal IgG antibovine serum albumin (BSA) antibody and either native BSA (isoelectric point 4.2) or BSA rendered cationic by treatment with ethylenediamine (isoelectric point 9.4). Native and cationized antigens were characterized by isoelectric focusing. ICs containing anti-BSA IgG or F(ab')2, formed either at equivalence or in excess of native or cationized antigen, were submitted to ultracentrifugation in a sucrose gradient for mesh size determination. The anti-complementary effect of ICs was evaluated by kinetic determination of haemolytic activity of human serum on haemolysin-sensitized sheep red blood cells. In conditions of antigen excess, the ICs formed by cationized BSA were significantly more efficient in activating human complement than those formed by native antigen. This higher activity was dependent on cationized antigen complexed with complete antibody molecules, as non-complexed cationized BSA or ICs prepared with F(ab')2 fragments were inactive under the same experimental conditions. Furthermore, this difference did not depend on the mesh size of the immune complexes. Our results suggest that the balance between antigen, antibody and C may be of importance in vivo for the onset and course of infections and other pathological processes involving IC formation. ICs containing cationized antigens should be proven of value in experimental models for studies on the regulation of C activation.
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Affiliation(s)
- M A Michelin
- Departamento de Ciências Biológicas, Faculdade de Medicina do Triângulo Mineiro, Uberaba, Minas Gerais, Brazil
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Teixeira JE, Costa RS, Lachmann PJ, Würzner R, Barbosa JE. CR1 stump peptide and terminal complement complexes are found in the glomeruli of lupus nephritis patients. Clin Exp Immunol 1996; 105:497-503. [PMID: 8809140 PMCID: PMC2200531 DOI: 10.1046/j.1365-2249.1996.d01-776.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The number of CR1 on podocytes is reduced in nephropathies with severe glomerular damage, especially in the diffuse proliferative glomerulonephritis (DPGN) of systemic lupus erythematosus (SLE). Reduction of CR1 number on erythrocytes is due to proteolysis of CR1 by macrophage proteases activated by the reaction of their complement receptors, which leaves a 'CR1 stump peptide' on the erythrocyte. In the present study, we demonstrated the presence of the terminal complement complex (TCC) and the CR1 stump in histological sections of biopsies from patients with SLE by the indirect immunoperoxidase technique. Less severe glomerular lesions presented TCC deposits mainly in the mesangium (mesangial pattern). In lupus nephritis, with more severe glomerular damage, TCC deposits were detected both in the mesangium and in the capillary loops with podocyte involvement (mixed pattern). Patients with highly active DPGN presented a marked reduction of intact podocyte CR1 receptors in association with increased reactivity to the anti-CR1 stump antibody and with glomerular TCC deposits of mixed histological pattern. These results suggest that the decrease in the number of podocyte CR1 receptors in severe glomerular lesions of SLE may be due to a local proteolytic activity associated with activation and deposition of TCC.
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Affiliation(s)
- J E Teixeira
- Department of Parasitology, Microbiology and Immunology, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Brazil
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Teixeira JE. [Hydergine in the symptomatic treatment of cerebrovascular insufficiency. Comparative clinical test with a placebo]. Hospital (Rio J) 1970; 77:1907-31. [PMID: 4992010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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