To assess use of imagery intervention in performance of two tennis motor skills the quasi-experimental design included a pre- and posttest and a control group. The tennis service shot and service receiving skill were selected as representative of open and closed skills, respectively. 48 subjects, male tennis players, whose ages ranged from 16 to 18 yr. (M = 17.2), were divided into two groups: (1) Technical practice only which was used as control group and (2) Imagery group who received both imagery and technical practice. Analysis of covariance showed a significant main effect for the imagery intervention on the closed skill (p = .002). Findings suggest that imaging a positive outcome may be more powerful in improving performance of closed skill movements than of open skill movements.

To assess use of imagery intervention in performance of two tennis motor skills the quasi-experimental design included a pre- and posttest and a control group. The tennis service shot and service receiving skill were selected as representative of open and closed skills, respectively. 48 subjects, male tennis players, whose ages ranged from 16 to 18 yr. (M = 17.2), were divided into two groups: (1) Technical practice only which was used as control group and (2) Imagery group who received both imagery and technical practice. Analysis of covariance showed a significant main effect for the imagery intervention on the closed skill (p = .002). Findings suggest that imaging a positive outcome may be more powerful in improving performance of closed skill movements than of open skill movements.

The effect of multimodal imagery on anxiety and perceived stress was investigated in 46 male tennis players (16 to 18 yr.; M = 17.0, SD = 0.8). There were two groups, a multimodal imagery group and a control imagery group. The quasi-experimental design included pre- and post-treatment administrations of the 27-item Competitive State Anxiety Inventory to assess anxiety and the Perceived Stress Scale to assess stress. Analysis showed a statistically significant multivariate difference between the multimodal imagery and control groups on measures of cognitive anxiety, self-confidence, and perceived stress. Imagery plays a role in handling some specific types of anxiety and stress.

Resumo -O objetivo do presente estudo foi comparar o O 2Máx , FC Máx , %FCR, % O 2 R e METs entre os gêneros durante a caminhada em ritmo autosselecionado e verificar se a intensidade selecionada apresenta-se fisiologicamente efetiva para manutenção ou melhora da aptidão cardiorrespiratória (ACR). Participaram 17 homens e 17 mulheres com média de idade de 23,32 ± 3,06 anos, submetidos: (I) avaliação antropométrica e teste incremental máximo em esteira, (II) um teste de 20-minutos de caminhada em ritmo autosselecionado. Na análise estatística, empregou-se um teste t Student para medidas independentes, adotando p<0,05. Nenhuma diferença significativa entre os gêneros para o %FC Máx (58,38 ± 8,86 para homens e 62,12 ± 5,91 para mulheres), %VO 2Máx (37,54 ± 10,75 para homens e 40,34 ± 7,27 para mulheres), %FCR (36,83 ± 11,77 para homens e 38,46 ± 8,33 para mulheres) e % O 2 R (31,88 ± 11,17 para homens e 34,70 ± 7,74 para mulheres). Entretanto, verifica-se que a velocidade de caminhada (km.h -1 ) selecionada foi superior no grupo masculino (5,96 ± 0,66; p<0,001) comparado ao feminino (5,41 ± 0,46), o que, possivelmente, propiciou que os METs fossem maiores nos homens (6,07 ± 1,57, p<0,05) comparado as mulheres (5,23 ± 0,77). Conclui-se que ambos os gêneros autosselecionam um ritmo de caminhada considerado não efetivo para manutenção e melhora da ACR, contudo, os valores de METs demonstram-se dentro do indicado para manutenção e redução do peso corporal. As diferenças encontradas entre os gêneros para o METs podem ser decorrentes das diferenças apresentadas para a velocidade de caminhada e características antropométricas. Palavras-chave: Exercício físico; Caminhada; Gênero. Max (58.38 ± 8.86 for men and 62.12 ± 5.91 for women), % O 2Max (37.54 ± 10.75 for men and 40.34 ± 7.27 for women), %HRR (36.83 ± 11.77 for men and 38.46 ± 8.33 for women), or % O 2 R (31.88 ± 11.17 for men and 34.70 ± 7.74 for women) were observed between genders. However, the walking speed selected (km.h -1 ) was higher in men (5.96 ± 0.66, p<0.001) than women, a finding that probably resulted in higher MET values for men (6.07 ± 1.57, p<0.05) compared to women (5.23 ± 0.77 Abstract -The objective of this study was to compare % O 2Max , %HR Max , %HRR, % O 2 R, and MET between genders during walking at a self-selected pace and to determine whether the self-selected pace was physiologically effective in maintaining and improving cardiorespiratory fitness. Seventeen men (age: 24.05 ± 3.3 years) and 17 women (age> 22.58 ± 2.67 years) were submitted to two experimental sessions: (I) anthropometric assessment and incremental exhaustion test, and (II) 20-min treadmill walking bouts at a self-selected pace. The independent Student t-test was used to determine differences between genders, at an alpha level of 0.05. No significant differences in %HR