Changes in recovery-stress state and performance in elite rowers during preparation for major competitions

This study investigated changes in the perceived recovery-stress state and performance in 6 highly trained Estonian rowers preparing for major competitions and representing Estonia in double sculls (age: M = 23.0, SD = 1.4 yr.; height: M = 198.0, SD = 0.0 cm; body mass: M = 97.1, SD = 6.4 kg), and quadruple sculls (age: M = 21.5, SD = 2.5 yr.; height: M = 189.5, SD = 5.4 cm; body mass: M = 90.9, SD = 4.8 kg). The subjects were training regularly and had been doing so for the last 10.5 yr. (double scullers, SD = 2.1 yr.) and 7.5 yr. (quadruple scullers, SD = 3.1 yr.), respectively. The Recovery-Stress Questionnaire for Athletes of Kellmann and Kallus was given two days before World Cup competitions. Standardized Stress and Standardized Recovery scores and RESTQ-Index were computed. In addition, resting cortisol in blood was measured at the same time. The performance of both boat classes constantly decreased from World Cup 1 to World Cup 3 as indicated by percent losses for winning boats. Resting cortisol and RESTQ-Index increased and decreased, respectively, at the same time. For double scullers, a decrease in RESTQ-Index mainly reflected the large decrease in the Standardized Recovery score. A decrease in RESTQ-Index was mainly based on a large increase in the Standardized Stress score for rowers performing in a quadruple scull. Present results indicate that the recovery-stress state affects performance of rowers in international competitions. RESTQ-Index could be used as the athletes' resource measure, while the Standardized Stress and Standardized Recovery scores reflect the athletes' extent of stress and recovery separately.     

Ultrasonic vocalizations as indices of affective states in rats

Adult rats spontaneously vocalize in ultrasonic frequencies. Although these ultrasonic vocalizations (USVs) have been described as by-products of locomotor activity or social signals, accumulating evidence suggests that they may also index anticipatory affective states. Converging ethological, pharmacological, and brain stimulation research indicates that whereas long low-frequency (> 0.3-s, approximately 22-kHz) USVs occur during anticipation of punishment or avoidance behavior, short, high-frequency (< 0.3-s, approximately 50-kHz) USVs typically occur during anticipation of reward or approach behavior. Thus, long 22-kHz USVs may index a state of negative activation, whereas short, 50-kHz USVs may instead index a state of positive activation. This hypothesis has theoretical implications for understanding the brain circuitry underlying mammalian affective states and clinical applicability for modeling hedonic properties of different psychotropic compounds.