Reliability of Peak Running Velocity Obtained on the Track Field in Runners of Different Performance Levels.

The aim of this study was to verify the reliability of peak running velocity obtained on the track field (Vpeak_TF) in runners of different performance levels. 39 male endurance runners were divided into two groups: trained runners (TR; n = 22; 10-km time running performance of 35.2 ± 1.7 min), and recreational runners (RR; n = 17; 10-km time running performance of 51.3 ± 4.8 min). They performed three maximal incremental running tests on the official track field (400 m), with an interval of 1 week between trials to determine the reliability of Vpeak_T. The Vpeak_TF showed high reliability, presenting an intraclass correlation coefficient and coefficient of variation of 0.97 and 1.28%, and 0.90 and 1.24% for TR and RR, respectively. Both TR and RR showed lowest bias and limits of agreement between test and retest (Vpeak_TF1 and Vpeak_TF2). In addition, there was no statistical test-retest difference for Vpeak_TF. In addition, the HR and RPE submaximal values were reliable for both TR and RR. Therefore, the Vpeak_TF showed high reliability in both TR and RR. These findings reinforce that the protocol for determining Vpeak_TF, using increments of 1 km h-1 every 3 min is reliable regardless of the performance level of the runners.

Caracterização das intensidades de esforço e relação da recuperação da frequência cardíaca e aptidão cardiorrespiratória com as respostas fisiológicas e perceptuais a uma sessão de dança de salão no estilo forró / Caracterización de las intensidades de esfuerzo y la relación entre la recuperación de la frecuencia cardíaca y la aptitud cardiorrespiratoria con respuestas fisiológicas y perceptivas a una sesión de baile de salón forró / Characterization of exercise intensities and relationship between heart rate recovery and cardiorespiratory fitness with physiological and perceptual responses to a forró ballroom dance session

Objetivo: Descrever intensidades de esforço (frequência cardíaca e percepção subjetiva de esforço) de uma sessão de dança de salão (i.e., forró), relacionando com a reativação parassimpática (e.g., recuperação da frequência cardíaca) e aptidão cardiorrespiratória (e.g., máxima velocidade aeróbia) em mulheres.Método: Estudo observacional, com a participação de 17 mulheres saudáveis com idade de 18-24 anos. No primeiro encontro realizou-se a sessão de Forró de 40 minutos (nove músicas; variações de xote e baião; monitoramento da frequência cardíaca e percepção subjetiva de esforço). Com intervalo de 24-48 horas, realizou-se teste incremental máximo para determinação da máxima velocidade aeróbia em esteira.Resultados: A intensidade da sessão de forró variou entre moderada e vigorosa com diferenciação entre as intensidades do xote (ritmo lento, moderada intensidade) e baião (ritmo rápido, vigorosa intensidade) a partir do percentual de frequência cardíaca máxima e com aumento linearizado para a percepção subjetiva de esforço. A máxima velocidade aeróbia foi inversamente correlacionada (moderadas/elevadas correlações) às respostas da: i) frequência cardíaca em cinco músicas; ii) percentual de frequência cardíaca máxima em três músicas; iii) percepção subjetiva de esforço em uma música. Não houve associação entre reativação parassimpática e as respostas fisiológicas/perceptuais à sessão de forró.Conclusão: A intensidade de uma sessão de forró varia entre moderada e vigorosa com melhor caracterização de intensidade de diferentes estilos (xote e baião) pelo percentual de frequência cardíaca máxima em comparação à percepção subjetiva de esforço. O forró pode ser usado para promover melhoras à saúde já que apresenta estímulo suficiente para tal. (AU)

Objetivo: describir la intensidad del esfuerzo (frecuencia cardíaca y percepción subjetiva del esfuerzo) de una sesión de baile de salón (es decir, forró), relacionando con la reactivación parasimpática (p. Ej., Recuperación de la frecuencia cardíaca) y la aptitud cardiorrespiratoria (p. Ej., velocidad aeróbica máxima) de mujeres.Método: Estudio observacional, con la participación de 17 mujeres sanas de 18 a 24 años. En la primera reunión, se realizó una sesión de 40 minutos de Forró (nueve canciones; variaciones de xote y baião; monitoreo de la frecuencia cardíaca y percepción subjetiva del esfuerzo). Con un intervalo de 24-48 horas, se realizó una prueba incremental máxima para determinar la velocidad aeróbica máxima en cinta rodante.Resultados: la intensidad de la sesión de forró varió entre moderada y vigorosa con una clara diferenciación entre la intensidad de esfuerzo del “xote” (paso lento, intensidad moderada) y “baião” (paso acelerado, intensidad vigorosa), en función del porcentaje de frecuencia cardíaca máxima y con un aumento lineal de la percepción subjetiva del esfuerzo. La velocidad aeróbica máxima se correlacionó inversamente (correlaciones moderadas / altas) con las respuestas de: i) frecuencia cardíaca en cinco canciones; ii) frecuencia cardíaca máxima en tres canciones; iii) percepción subjetiva del esfuerzo en una canción. No hubo asociación entre la reactivación parasimpática y las respuestas fisiológicas/perceptivas a la sesión de forró.Conclusión: La intensidad de una sesión de forró varía entre moderada y vigorosa, con una mejor diferenciación de la intensidad de los estilos (xote y baião), usando la frecuencia cardíaca máxima, en comparación con la percepción subjetiva del esfuerzo. El forró puede usarse para promover mejoras en la salud ya que induce suficiente estímulo para eso. (AU)

Objective: To describe exercise intensities (heart rate and rating of perceived exertion) over a ballroom dance session (i.e., forró) and to relate to parasympathetic reactivation (e.g., heart rate recovery) and cardiorespiratory fitness (e.g., maximum aerobic speed) in women.Method: Observational study, involving 17 healthy women aged 18 to 24 years. On the first visit was held a 40-minute Forró session (nine songs; xote and baião variations; heart rate monitoring and rating of perceived exertion). With intervals of 24-48 hours, the participants perform a maximal incremental test to determine treadmill maximum aerobic speed.Results: The intensity of a forró session ranged from moderate to vigorous with clear differentiation between “xote” (slow pace, moderate intensity) and “baião” (fast pace, vigorous intensity) intensities when monitored by percentage of maximal heart rate and a linear increase when monitored by rating of perceived exertion. The maximum aerobic speed was inversely correlated (moderate/high correlation) to the responses of: i) heart rate in five songs; ii) percentage of maximal heart rate in three songs; iii) rating of perceived exertion in one song. There was no association between parasympathetic reactivation and physiological/perceptual responses to the forró session.Conclusion: The intensity of a forró session ranges from moderate to vigorous, with better characterization of intensity in different styles (xote and baião) by percentage of maximal heart rate compared to rating of perceived exertion. Forró can be used to promote health, as it promotes enough stimulus. (AU)

Peak Running Velocity or Critical Speed Under Field Conditions: Which Best Predicts 5-km Running Performance in Recreational Runners?

This study aimed to examine which variable, between the peak running velocity determined on the track field (V peak_TF) and critical speed (CS), is the best predictor of the 5-km running performance in recreational runners. Twenty-five males performed three tests to determine the V peak_TF, CS, and 5-km running performance on the track field, with a minimal interval of 48 h between each test. The V peak _TF protocol started with a velocity of 8 km⋅h-1, followed by an increase of 1 km⋅h-1 every 3 min until volitional exhaustion, which was controlled by sound signals, with cones at every 25 m indicating when the participants were required to pass the cone's position to maintain the required velocity. The participants performed three time trials (TTs) (1: 2,600 m; 2: 1,800 m; and 3: 1,000 m) on the same day, with a 30-min rest period to determine the CS through the combinations of three (CS1,2,3) and two TTs (CS1,2, CS1,3, and CS2,3). The 5-km running performance time was recorded to determine the test duration, and the mean velocity (MV) was calculated. There was a significant difference observed between the V peak_TF and the MV 5-km running performance. However, no differences were found between the CS values and the MV 5-km running performance. A correlation was observed between the V peak_TF (R = -0.90), CS1,2,3 (R = -0.95), CS1,3 (R = -0.95), and the 5-km running performance time. Linear regression indicated that the V peak_TF (R 2 = 0.82), CS1,2,3 (R 2 = 0.90), and CS1,3 (R 2 = 0.90) significantly predicted the 5-km running performance time. The CS results showed a higher predictive power for the 5-km running performance, slightly better than the V peak_TF. Also, CS1,2,3 and the CS1,3 presented the highest predictive power for the 5-km running performance of recreational runners.

Effects of a backward running training on backward peak velocity running, V̇O2max, vVO2max and 3 km forward running performance in male adults: a pilot study

Abstract Aims: The study aimed to evaluate the effects of a backward running (BR) training program prescribed by the peak backward running velocity (Vpeak_BR) on physiological variables and a 3 km forward running (FR) performance. Methods: Eight untrained running male adults in running took place in the study. All the participants underwent five weeks of BR training prescribed based on Vpeak_BR. They performed a maximal incremental test on the treadmill to determine the maximal oxygen uptake (V̇O2max) and the velocity associated with V̇O2max (vV̇O2max). The participants were also tested on the track field to determine the Vpeak_BR and undertook a 3 km FR performance. All initial assessments were also performed after the training period. Results: The results showed statistically significant improvements in 3 km FR performance (14.2 ± 1.2 min vs. 13.5 ± 1.0 min) and Vpeak_BR (8.0 ± 0.8 km·h−1 vs. 8.5 ± 0.5 km·h−1) after the training period. Conclusion: BR training effectively improved 3 km FR performance and Vpeak_BR, demonstrating that Vpeak_BR determined according to the protocol proposed in this study can be used for the prescription of BR training. Further, BR training represents an effective training method that can be inserted into an FR running training program.

Coaches' and young soccer players' training load perceptions during different training phases / Percepciones de la carga de entrenamiento de entrenadores y jóvenes jugadores de fútbol durante diferentes fases de entrenamiento / Percepção da carga de treinamento de técnicos e jovens jogadores de futebol durante diferentes fases de treinamento

OBJECTIVE: To our Knowledge, information about the agreement between coaches and the young soccer players' session rating of perceived exertion is not consistent during specific periods of training (intensification and taper) and has not been established. The purpose of this study was to examine and compare the internal training load and session rating of perceived exertion between coaches' and young soccer players' during three weeks in different training phases. METHOD: Participants were 16 male elite Under19 soccer players and their coaches. Before each training session, the coaches reported a session rating of perceived exertion using the Borg CR-10 scale as well as the planned duration (min) of the training based on prior planning, while the athletes responded the scale after each training session. RESULTS: No differences in intensity session rating of perceived exertion (t = 0.49; p = 0.62) and training load (t = 0.18; p = 0.86) were observed between coaches and players during the training period analyzed. During different training phases, no significant differences were found during intensification (t = 0.18; p = 0.85) and taper (t = -0.19; p = 0.85) in training loads and in the session rating of perceived exertion prescribed by coaches and perceived by players. A very large correlation was observed between coaches training load (r= 0.84) and players training load. However, a trivial correlation was found between players training load and changes in the Yo-yo IR1 performance (r= -0.09), age (r= -0.06) and years of competitive experience (r= -0.08). Stepwise linear regression revealed that coaches training load (F1; 238= 582.7; R2= 0.710; p < 0.001) explained 71% of the variance in players training load. CONCLUSION: The results suggest that the session rating of perceived exertion and training load prescribed during three weeks in different training phases (by coaches) was not different from perceived by young soccer players. Moreover, coaches training load seem to be effective to predict the training load in soccer players

OBJETIVO: En nuestro conocimiento, la información sobre la concordáncia entre la percepción subjetiva del esfuerzo durante el entrenamiento de entrenadores y de jóvenes julgadores de fútbol, durante los períodos específicos de entrenamiento (intensificación y reducción de cargas), no se ha establecido. El propósito de este estudio fue examinar y comparar la carga interna de entrenamiento y la percepción subjetiva del esfuerzo durante el entrenamiento entre los entrenadores y jóvenes jugadores de fútbol durante tres semanas en diferentes fases de formación. MÉTODO: Participaron 16 jugadores de fútbol sub19 y sus entrenadores. Antes de cada sesión de entrenamiento, los entrenadores informaron una clasificación del esfuerzo de sesión percibido usando la escala Borg CR-10 así como la duración planificada (min) de la capacitación basada en la planificación previa, mientras que los atletas respondieron la escala después de cada sesión de entrenamiento. RESULTADOS: No se observaron diferencias en la percepción subjetiva del esfuerzo durante el entrenamiento (t = 0.49; p = 0.62) y la carga de entrenamiento (t = 0.18; p = 0.86) entre el entrenador y los jugadores durante el período de entrenamiento analizado. Durante las diferentes fases de entrenamiento no se encontraron diferencias significativas durante la intensificación (t = 0.18; p = 0.85) ni la reducción de cargas (t = -0.19; p = 0.85), en las cargas de entrenamiento y en la percepción subjetiva del esfuerzo, durante el entrenamiento prescrito por el entrenador y percibido por los julgadores. Se observaron correlaciones muy grandes entre la carga de entrenamiento de los entrenadores (r = 0.84) y la carga de entrenamiento de los jugadores. Sin embargo, se encontró una correlación trivial entre la carga de entrenamiento de los jugadores y los cambios en el rendimiento del Yo-yo IR1 (r = -0.09), edad (r = -0.06) y años de experiencia competitiva (r = -0.08). La regresión lineal múltiple reveló que la carga de entrenamiento de los entrenadores (F1; 238 = 582.7, R2 = 0.710, p <0.001) explicó el 71% de la varianza en la carga de entrenamiento de los jugadores. CONCLUSIONES: Los resultados sugieren que la percepción subjetiva del esfuerzo durante el entrenamiento prescrito durante tres semanas, en diferentes fases de entrenamiento, no fue diferente de lo percibido por los jugadores jóvenes de fútbol. Además, la carga de entrenamiento de los entrenadores parece ser eficaz para predecir la carga de entrenamiento en estos jugadores

OBJETIVO: Nenhum estudo examinou se a concordância entre a percepção subjetiva de esforço do treinador e de jovens jogadores de futebol é consistente durante períodos específicos de treinamento (intensificação e taper). O objetivo deste estudo foi examinar e comparar a carga interna de treinamento e a percepção subjetiva de esforço da sessão entre treinadores e jovens futebolistas durante três semanas em diferentes fases de treinamento. MÉTODOS: Participaram 16 jogadores de futebol sub-19 e seus treinadores. Antes de cada sessão de treinamento, os treinadores informaram uma classificação de esforço da sessão percebido usando a escala de BORG CR-10 assim como a duração planejada (min) do treinamento, enquanto os atletas responderam à escala após cada sessão de treinamento. RESULTADOS: Não foram observadas diferenças para a percepção subjetiva de esforço da sessão (t = 0.49; p = 0.62) e para a carga de treinamento (t = 0.18; p = 0.86) entre os técnicos e jogadores durante o período de treinamento analizado. Durante as diferentes fases de treinamento, não foram encontradas diferenças significantes durante a intensificação (t = 0.18; p = 0.85) e taper (t = -0.19; p = 0.85) na carga de treinamento e a percepção subjetiva de esforço da sessão prescrita pelos técnicos e a percebida pelos jogadores. Correlações muito grandes foram observadas entre a carga de treinamento dos treinadores (r= 0.84) e a carga de treinamento dos jogadores. No entanto, foi encontrada uma correlação trivial entre a carga de treinamento dos jogadores e as mudanças no desempenho do Yo-yo IR1 (r = -0.09), idade (r = -0.06) e anos de experiência competitiva (r = -0.08). A regressão linear múltipla revelou que a carga de treinamento dos treinadores (F1; 238 = 582.7; R2 = 0.710; p <0.001) explicou 71% da variância na carga de treinamento dos jogadores. CONCLUSÃO: Os resultados sugerem que, a percepção subjetiva de esforço da sessão e a carga de treinamento prescritos durante três semanas em diferentes fases de treinamento (pelos treinadores), não foi diferente do percebido pelos jovens jogadores de futebol. Além disso, a carga de treinamento dos treinadores parece ser eficaz para prever a carga de treinamento em jovens jogadores de futebol

Effect of beetroot juice supplementation on 10-km performance in recreational runners.

The purpose of this study was to investigate the effects of chronic beetroot juice (BRJ) supplementation on 10-km running performance in recreational runners. In a double-blind, placebo-controlled, crossover-designed study, 14 male recreational runners (age, 27.8 ± 3.4 years) performed three 10-km running tests, at baseline and under the conditions of BRJ supplementation and placebo (PLA). Supplementation was administered for 3 days, and on the days of the assessments, the ingestion occurred 2 h before the test and consisted of a dose of 420 mL of BRJ in natura (8.4 mmol inorganic nitrate (NO3-)·day-1) or PLA with depleted NO3- (0.01 mmol NO3-·day-1). The mean velocity (MV) was calculated, and the following variables were determined: maximal heart rate, maximal rating of perceived exertion, blood glucose concentration (analyzed before and after the test), and lactate peak. There was no main effect between conditions regarding 10-km running time performance (BRJ: 50.1 ± 5.3 min; PLA: 51.0 ± 5.1 min; P = 0.391) and total MV (BRJ: 12.1 ± 1.3 km·h-1; PLA: 11.9 ± 1.2 km·h-1; P = 0.321) or in the other analyzed variables. The time to complete the first half of the test (5 km) was statistically lower in the BRJ group than in the PLA group (P = 0.027). In conclusion, chronic supplementation with BRJ increased MV in the first half of the test and improved the final test times of 10 of the 14 runners, although we did not find a statistically significant difference in the performance of the 10-km run.

Pontos de transição da frequência cardíaca na marcha atlética / Transition points of heart rate at race walking / Puntos de transición de la frecuencia cardíaca en la marcha atlética

RESUMO Introdução: A frequência cardíaca fornece informações úteis para os treinamentos de marcha atlética. Objetivo: O objetivo do estudo foi analisar o comportamento da frequência cardíaca (FC) e seus pontos de inflexão (PIFC) e deflexão (PDFC) em teste progressivo de marcha atlética (TPMA) antes e depois de 20 sessões de treinamento. Métodos: Participaram 13 jovens atletas (12,46 ± 1,61 anos, 44,29 ± 10,25 kg, 157,93 ± 12,03 cm, 24,39 ± 7,60 %G). O TPMA foi realizado em uma pista oficial de atletismo, antes e depois do treinamento. Os dados de FC e carga foram plotados a cada minuto para identificação dos PIFC e PDFC. Resultados: A FC apresentou comportamento sigmoide, com identificação dos pontos de transição (PT), sendo no pré-treinamento: a) oito sujeitos PIFC (5,31 km·h-1; 125 bpm) e PDFC (7,63 km·h-1; 169 bpm); b) um sujeito somente PIFC (7,00 km·h-1; 149 bpm); c) um sujeito somente PDFC (8,00 km·h-1; 170 bpm); d) três sujeitos sem detecção de PT e no pós-treinamento: a) em 12 sujeitos PIFC (5,46 km·h-1; 125 bpm) e PDFC (7,75 km·h-1; 168 bpm); b) um sujeito somente PDFC (7,50 km·h-1; 184 bpm). O PIFC foi encontrado em carga significativamente inferior ao PDFC no pré (p < 0,001) e no pós-treinamento (p < 0,001). Quando comparamos o PIFC e o PDFC pré e pós, não encontramos diferença significativa, seja em relação à carga (p = 0,87 e p = 0,61) ou FC (p = 0,60 e p = 0,99). Conclusão: Conclui-se que a FC tem relação curvilínea com a carga, sendo possível detectar os seus pontos de transição em TPMA.

ABSTRACT Introduction: Heart rate provides useful information for race walking training. Objective: The objective of study was to analyze the behavior of heart rate (HR) and inflection points (HRIP) and deflection points (HRDP) in a progressive test of race walking (PTRW) before and after 20 training sessions. Methods: Participants were 13 young athletes (12.46 ± 1.61 years, 44.29 ± 10.25 kg, 157.93 ± 12.03 cm, 24.39 ± 7.60 F%). The PTRW was held at an official athletics track before and after training. The HR data and load were plotted every minute to identify the HRIP and HRDP. Results: The HR showed sigmoid behavior with the identification of transition points (TP), being in the pre-training: a) eight subjects HRIP (5.31 km·h-1; 125 bpm)and HRDP (7.63 km·h-1; 169 bpm); b) one subject only HRIP (7.00 km·h-1; 149 bpm); c) one subject only HRDP (8,00 km·h-1; 170 bpm); d) three subjects had no TP observed, and post-training: a) 12 subjects HRIP (5.46 km·h-1; 125 bpm) and HRDP (7.75 km·h-1; 168 bpm); b) one subject HRDP (7.50 km·h-1; 184 bpm). The HRIP was found to be significantly lower than the HRDP in pre-training (p<0.001) and post-training (p<0.001). When we compared HRIP and HRDP in the pre- and post-training we found no significant difference either in relation to the load (p=0.87 and p=0.61) or HR (p=0.60 and p=0.99). Conclusion: It is concluded that the HR has curvilinear relation with the load, and that it is possible to detect its transition points during PTRW.

RESUMEN Introducción: La frecuencia cardiaca proporciona información útil para los entrenamientos de marcha atlética. Objetivo: El objetivo del estudio fue analizar el comportamiento de la frecuencia cardiaca (FC) y sus puntos de inflexión (PIFC) y de deflexión (PDFC) en prueba progresiva de marcha atlética (PPMA) antes y después de 20 sesiones de entrenamiento. Métodos: Participaron 13 atletas jóvenes (12,46 ± 1,61 años, 44,29 ± 10,25 kg, 157,93 ± 12,03 cm, 24,39 ± 7,60 %G). El PPMA fue realizado en una pista oficial de atletismo antes y después del entrenamiento. Los datos de FC y carga fueron trazados cada minuto para identificación de PIFC y PDFC. Resultados: La FC presentó comportamiento sigmoideo, con identificación de los puntos de transición (PT), siendo en el pre-entrenamiento: a) ocho sujetos PIFC (5,31 km·h-1, 125 lpm) y PDFC (7,63 km·h-1; 169 lpm); b) un sujeto solamente PIFC (7,00 km·h-1; 149 lpm); c) un sujeto solamente PDFC (8,00 km·h-1, 170 lpm); d) tres sujetos sin detección de PT y post-entrenamiento: a) 12 sujetos PIFC (5,46 km·h-1, 125 lpm) y PDFC (7,75 Km·h-1; 168 lpm); b) un sujeto solamente PDFC (7,50 km·h-1, 184 lpm). El PIFC fue encontrado en carga significativamente inferior que el PDFC en el pre (p < 0,001) y en el post-entrenamiento (p < 0,001). Al comparar el PIFC y el PDFC pre y post-entrenamiento, no se encontró ninguna diferencia significativa, sea en relación a la carga (p = 0,87 y p = 0,61) o FC (p = 0,60; p = 0,99). Conclusión: Se concluye que la FC tiene relación curvilínea con la carga, siendo posible detectar sus puntos de transición en PPMA.

Peak velocity and its time limit are as good as the velocity associated with VO 2max for training prescription in runners.

This study compared the effects of 4 weeks of training prescribed by peak velocity (V peak ) or velocity associated with maximum oxygen uptake (vVO 2max ) in moderately trained endurance runners. Study participants were 14 runners (18-35 years) randomized into 2 groups, named group VO 2 (GVO 2 ) and group V peak (GVP). The GVO 2 had training prescribed by vVO 2max and its time limit (t lim ), whereas the GVP had training prescribed by V peak and its t lim . Four tests were performed on a treadmill: 2 maximum incremental for V peak and vVO 2max and 2 for their t lim . Performance (10 km) was evaluated on a 400 m track. Evaluations were repeated after 4 weeks of endurance training. The results showed a significant effect of training on V peak [GVP (16.7±1.2 - 17.6±1.5 km . h -1 ), GVO 2 (17.1±1.9-17.7±1.6 km·h -1 )]; vVO 2max [GVP (16.4±1.4-17.0±1.3 km·h -1 ), GVO 2 (17.2±1.7-17.5±1.9 km·h -1 )]; and 10 km performance [GVP (41.3±2.4-39.9±2.7 min), GVO 2 (40.1±3.4-39.2±2.9 min)]. The V peak highly correlated with performance in both pre- and post-training in GVP (-0.97;-0.86) and GVO 2 (-0.95;-0.94), as well as with vVO 2max in GVP (-0.82;-0.88) and GVO 2 (-0.99; -0.98). It is concluded that training prescribed by V peak promoted similar improvements compared to training prescribed by vVO 2max . The use of V peak is recommended due to its practical application and the low cost of determination.

Influência do nível de performance na estratégia de ritmo de corrida em prova de 10 km de corredores recreacionais / Influence of performance level on pacing strategy during 10 km race in recreational runners

ResumoO objetivo do estudo foi verificar a influência do nível de performance na estratégia de ritmo de corrida de corredores recreacionais. Adicionalmente, objetivou-se descrever o comportamento da frequência cardíaca (FC) obtida em prova de 10 km em pista de atletismo. Participaram 39 corredores recreacionais (31,5 ± 6,7 anos), experientes em provas de 10 km que realizaram uma performance nesta distância em pista de atletismo (400 m). A FC foi constantemente monitorada (Polar RS800) e o tempo a cada 400 m foi registrado para determinação da velocidade média (VM), posteriormente analisada a cada 2 km. Os participantes foram divididos em dois grupos de acordo com a VM alcançada nos testes: G1 = VM 10 km ≤ 11,81 (n = 20) e G2 = VM 10 km > 11,81 (n = 19). A comparação entre os valores de VM e FC obtidos nos diferentes momentos da performance para os dois grupos foi realizada pela Anova mista, adotando-se nível de significância de p < 0,05. Os valores de VM foram diferentes entre os grupos em todos os momentos analisados, com aumento significante da VM do momento 6-8 km para 8-10 km para o mesmo grupo. Os valores de FC foram diferentes apenas intra-grupos. No G1, houve aumento significante da FC a cada 2 km de prova. Para o G2, a FC aumentou do 2º ao 4º km e permaneceu estável até o 8º km, aumentando novamente nos últimos 2 km da performance. Concluímos que o nível de performance não influencia a estratégia de corrida de corredores recreacionais.

AbstractThe aim of the present study was to verify the influence of the performance level in the strategy of running pacing from recreational runners. Additionally, it was aimed to describe the heart rate (HR) responses measured in a 10-km running performance in a track. Thirty-nine recreational runners took part (31.5 ± 6.7 years), who had experience in 10-km races and realized a 10-km running performance in a track (400 m). HR was constantly monitored (Polar RS800) and the time each 400 m was registered to determine MS, and then analyzed each 2 km. Participants were divided into two groups according to their MS attained in the tests: G1 - MS 10 km ≤ 11.81 (n = 20) and G2 - MS 10 km > 11.81 (n = 19). The comparison between MS and GR obtained in different moments of the performance for both groups was made by mixed Anova for repeated measures, adopting a significance level of p < 0.05. MS values were different between the groups in all moments analyzed with a significant increase in MS from moment 6-8 km to 8-10 km for the same group. HR values were different only within-groups. In G1, there was a significant increase in HR each 2 km. For G2, HR increased from the second to the forth km and remained stable up to the eighth km, increasing again in the last 2 km of the performance. We concluded that the performance level does not influence in the running strategy of recreational runners.