The affective interval: An investigation of the peaks and valleys during high- and moderate-intensity interval exercise in regular exercisers

Evidence supports the notion that people generally feel worse during high(er) intensity exercise but experience an affective rebound immediately following cessation that often exceeds pre-exercise feeling states. Considering rest/recovery is an integral part of interval exercise, it is of interest to determine the degree of affective reactivity and recovery that may occur during interval exercise of different intensities. The purpose of the present study was to examine affective reactivity to and recovery from an acute bout of moderate-intensity (MIIE) and high-intensity interval exercise (HIIE). Participants (N = 25, 13 females, 23.3 ± 4.0 yrs, BMI = 25.7 ± 4.1 kg m⁻²) completed 4 sessions at the same time of day with at least 24-h between each session: a baseline session to record resting affect, a graded exercise test on a stationary bike (cycle ramp protocol 25 W·min-1) to volitional exhaustion, and then completed a high- (HIIE) and moderate-intensity interval exercise (MIIE) session where affect was recorded prior to, during, and up to 30-min post exercise. Participants reported more negative feeling states during the HIIE session compared to the MIIE session, but these states recovered similarly as early as 5-min post-exercise. In addition, while affective change (reactivity and rebounds) were relatively equal during the MIIE, declines in affect during the HIIE outweighed the affective rebounds associated with rest, resulting in a large decline in affective state from pre-exercise.     

Mood change through physical exercise in nine- to ten-year-old children.

The present study assessed the effect of two types of physical exercise on the self reported mood of 64 9 and 10-yr.-old children who responded to a self-report mood meassure after two different types of aerobic exercise of 15 min., and after a 15-min. video. Significant increases in positive mood and significant decreases in negative mood were found after each exercise treatment; however, positive mood decreased and negative mood increased following the video treatment. Interestingly, no significant difference in mean mood scores was found between the two exercise treatments. These data suggest that short bouts of physical exercise have psychological benefits for children.     

A dyadic investigation of exercise support between cardiac patients and their spouses.

The authors examined married partners' similarity in reported exercise behavior as a moderator of the association between social support for exercise provided and received by extending an actor-partner dyadic effects model. Participants were married cardiac rehabilitation patients and their spouses (N=99 couples). For couples similar in their reported exercise behavior, a significant association was found between both partners' independent reports of providing exercise support to and receiving exercise support from one another (n=49 couples). However, for couples differing in their reported exercise behavior (n=50 couples), no association was found between either partner's provision and receipt of support for exercise. Findings have the potential to inform practitioners of patients who may not be receiving adequate social support for their recommended exercise. Future interventions may consider implementing dyadic educational or motivational strategies with patients and their spouses.     

Heart rate and ratings of perceived exertion during treadmill and elliptical exercise training

Elliptical exercise has recently increased in popularity. However, little is known regarding heart rate and perceptual responses during this exercise mode even though such information is important with respect to prescribing and regulating exercise intensity. In the current study, heart rate and perceived exertion were compared between treadmill and elliptical exercise. During treadmill exercise (TM(EST)) participants estimated RPE-Overall as well as RPE-Legs and RPE-Chest. Two elliptical sessions followed: (1) RPE estimation during elliptical exercise (EL(EST)): HR (b/ min.) from TM(EST) was achieved during elliptical exercise, with participants estimating RPE-Overall, RPE-Legs, and RPE-Chest. (2) RPE production during elliptical exercise (EL(PROD)): RPE-Overall from TM(EST) was produced during elliptical exercise. There were no significant differences between modes for RPE-Overall (TM(EST): 11.2 +/- 2.2 vs EL(EST): 11.9 +/- 3.2) or RPE-Chest (TM(EST): 11.0 +/- 2.4 vs EL(EST): 11.7+/- 3.2). Mean RPE-Legs was significantly different (TM(EST): 11.2 +/- 2.4 vs EL(EST): 12.5 +/- 3.1). Heart rate was not significantly different between TM(EST) (163 +/- 16.6) and EL(PROD) (159 +/- 20.0). Analysis indicated elliptical exercise is perceived as more intense with respect to leg (RPE-Legs) exertion. Further, RPE-Overall appears effective for regulating heart rate during elliptical exercise.     

Stage of exercise change model and attitudes toward exercise in older adults.

This study examined the attitudes toward exercise held by older adults within different stages of the exercise change model for the purpose of aiding health professionals in developing effective approaches that engage older adults in physical activity. Men and women (n = 116) between the ages of 60 and 93 years (73.9+/-6.6) completed a questionnaire used to categorize them into one of five stages of exercise change: precontemplation, contemplation, preparation, action, and maintenance. Participants also completed a questionnaire to assess four attitude factors related to exercise: tension release, health promotion, vigorous exercise, and social benefits. The Active older adults in this study reported positive attitudes toward exer cising for health benefits, social interaction, and tension release. Of these, the health benefits of exercise appear to be the most important factor in their participation in exercise. Therefore, prograns designed to engage older adults in regular physical activity should promote positive attitudes toward exercise, especially regarding the health related aspects of exercise.     

Heart rate--QT relationships during baroreceptor stimulation with diminished autonomic influence on the ventricles. Ventricular autonomic tone and QT interval.

The shortening of the QT interval of the electrocardiogram coincident with acceleration of heart rate and vice versa has been accepted for many years as evidence that the action potential duration and hence QT are necessarily dependent on heart rate. Exceptions to this rule have been attributed to the intervention of counteracting autonomic effects. In order to test this assumption, 26 conscious dogs divided into three groups were tested during baroreceptor stimulation by a bolus injection of phenylephrine. Seventeen dogs had been used in earlier studies in which they had undergone an experimental anterior myocardial infarction with apparent full recovery. A group of those dogs underwent beta-adrenergic blockade by intravenous atenolol 30 min prior to the baroreceptor activation. To test the intactness of the baroreceptor responses in the previously infarcted dogs, a third group of nine dogs that had had no prior myocardial infarction was included. All dogs were adapted to the laboratory environment and were not sedated during experiments. Simultaneous recordings of RR, QT interval, and phasic arterial pressure were made in all dogs before and during baroreceptor stimulation. In the normal group, and the previously infarcted group that received no atenolol, baroreceptor stimulation elicited a small (8/msec), but significant prolongation of the QT associated with a nearly 50% reduction in heart rate. The QT interval of the atenolol-treated dogs, although significantly more prolonged before stimulation, remained unchanged during the reflex. The data indicate that withdrawal of ventricular sympathetic tone may prolong the QT interval, thereby confirming the role of sympathetic innervation in the control of QT.(ABSTRACT TRUNCATED AT 250 WORDS)     

体育锻炼与疲劳关系的综述研究

通过文献综述法简要地总结了疲劳的概念、研究历史及现状,介绍了疲劳的机理研究,探讨了体育锻炼与疲劳的关系及疲劳的判断、消除等。研究结果表明：（1）目前,有关体育锻炼的生理疲劳的研究相当系统、全面;但体育锻炼的心理疲劳的研究相当薄弱、少见。（2）体育锻炼的心理疲劳并非生理疲劳的必然结果,而受个人心理因素以及个体周围环境的影响等等。（3）随着心理健康的日渐重要,未来有关心理疲劳的研究将倍受重视。     

Mood regulation and relationship quality predict change in homesickness during college

Recent theorizing has implicated affect regulation as central to the experience of homesickness. Conceptualized as grief due to losing social connections with close others when relocating, homesickness is associated with poor emotional and social adjustment. The present study examined how mood regulation and relationship quality – at home and in college – predict homesickness and negative affect among college students (N = 168). We assessed 16 mood regulation strategies as well as relationship quality each week over the first college term. As predicted, time-lagged multilevel analyses demonstrate that avoidance-oriented strategies were helpful in the short term (the following week), but chronic avoidance (across the college term) predicted higher levels of homesickness. Approach-oriented regulatory strategies did not predict homesickness, however. Relationship quality demonstrated differential main effects at the between-person level but did not predict fluctuations in homesickness from week to week. Across the college term, closer ties at home predicted greater homesickness, whereas closer ties in college predicted lower homesickness. Notably, there were distinct effects of mood regulation for homesickness compared to negative affect. The present study is among the first to examine effects of mood regulation on homesickness longitudinally, suggesting it is important to consider the type of regulation strategies being used as well as the time scale.     

Uric acid and divergent thinking: a possible relationship.

An exploratory investigation of the relationship between serum uric acid levels in male university students and their scores on tests of convergent and divergent thinking was carried out. The data suggested that uric acid levels are lower in highly divergent thinkers than in less divergent. This led to the speculation that uric acid may be an important biochemical precursor of intellectual functioning. If it does affect intellectual functioning, this may result from the action of uric acid as an endogenous cortical stimulant, or possibly from its action as a facilitator of learning.     

Perceptions of the behavioral influence of goals: A mediational relationship to exercise

Abstract

In the present study, it is argued that a more fundamental approach is necessary for the study of exercise goals and exercise behavior if we are to understand their relationship. The specific purposes of the investigation were to a) examine the relationships between perceptions of the behavioral influence of goals, moderators of goal influence (i.e., goal clarity) and perceptions of required exercise behavior (frequency and intensity), (b) examine changes that occurred over time to measures of goal-related variables and (c) describe various personal exercise goals and related action plans to achieve goals. Ninety-nine healthy adults in intermediate level university fitness classes were volunteers in this prospective study. The present study revealed that exercisers have multiple goals and action plans and are also knowledgeable about the specific behavioral strategies and exercise behaviors required to attain these goals. Also, the clarity, commitment, and perceived behavioral influence of goals increased as adherers gained experience with the exercise program. Finally, perceptions of the way goals influence behavior was found to mediate the goal clarity-exercise intensity and the goal commitment-exercise intensity relationships at the beginning of the exercise program but not at mid-program. Instead, independent relationships emerged at midprogram between goal clarity and goal influence, goal commitment and goal influence, goal clarity and exercise intensity, goal commitment and exercise intensity, and goal influence and exercise intensity. Results an discussed in terms of the complex and changing nature of the perceptions people hold of their goals and how these goals influence their exercise.     

A pilot study into a possible relationship between diet and stuttering

PurposeThere are theoretical and empirical reasons to consider a potential role for copper metabolism in the brain in how it could influence stuttering. However, a link between stuttering and dietary intake has never been researched in a systematic way. This pilot study therefore aimed to explore a possible association between ingested amounts of copper and thiamine (vitamin B1) with stuttering frequency using a double blind cross-over longitudinal paradigm.Methods19 adults who stutter between 20 and 51 years old filled out an online survey for 9 consecutive weeks. The survey consisted of self-assessed fluency and mood state scales, as well as food journals. After 4 weeks, the participants consumed either copper or thiamine supplements for 2 weeks, followed by a 1-week washout period, and another period of two weeks taking the other supplement. Formal speech assessments were done pre/post baseline and at the end of each supplement intake. Participants were not informed about the nature of the supplements during the experiment and the investigators were blinded to the order of the supplements.ResultsThe results demonstrated that copper and thiamine had no measurable effect on the amount of stuttering (self and formal assessments) but there was a moderate, significant correlation between mood state and fluency.ConclusionThe findings do not support notions of dietary influences of ingested copper or thiamine on stuttering but do provide modest support for a relationship between variations in stuttering and self-perceived anxiety.     

The cardiac orienting response and its relationship to the cardiac conditional response in dogs

Orienting tones of two durations (11 seconds and 42 seconds) were presented to two groups of dogs, and the heart rate-orienting responses (HR-OR) were measured. With the brief tone (11 seconds) the initial HR-OR was usually a bradycardia. With the longer tone (42 seconds) the HR-OR was a biphasic response, an initial bradycardia followed by a tachycardia. The bradycardia component extinguished more rapidly than the tachycardia component of this response. The bradycardia also extinguished more rapidly to the long tone than to the brief tone. With the brief tone the degree of HR-OR was not highly correlated with the degree of HR conditional response given by the same dog after the tone had been reinforced by shock.     

The impact of variation and autonomy on psychological responses to high intensity interval training exercise

IntroductionHigh-intensity interval training (HIIT) provides notable physiological benefits and is generally well-tolerated across modalities and populations. This study investigated how exercise autonomy support impacts psychological responses to exercise.MethodsTwenty-nine participants completed three HIIT trials: Conventional-HIIT with 60-sec work segments, Varied-HIIT with a mix of 30, 60, 90, & 120-sec segments, and Autonomous-HIIT with self-selected 30, 60, 90, & 120-sec segments. Affective valence, enjoyment, and intention were measured.ResultsAffective valence during exercise was not different between trials (p > 0.05) but enjoyment during exercise was higher for Autonomous-HIIT (p < 0.05). Enjoyment and intention measured post-exercise were greater for Autonomous-HIIT than Varied-HIIT (p < 0.05).ConclusionAutonomous HIIT produced more desirable responses than varied and traditional HIIT sessions. These data suggest that HIIT sessions utilizing self-selected interval durations can produce more positive responses, which provides the basis for recommending autonomy within HIIT exercise.     

Early interactional change and its relationship to family therapy outcome

In the present study, a tailoring methodology was employed to investigate the detection of early interactional change in the course of family therapy and the possible prognostic value of such change for therapy outcome. The predicted relationship received partial support and suggested a model of change in families, with early interactional change as a mediating factor.     

Unveilling the cerebral and sensory contributions to automatic postural control during dual-task standing

ObjectivesThe postural control dual-task literature has demonstrated greater postural stability during dual-task in comparison to single task (i.e., standing balance alone through the examination of multiple kinetic and kinematic measures. This improve stability is thought to reflect an automatic mode of postural control during dual-task. Recently, sample entropy (SampEn) and wavelet discrete transform have supported the claim of automaticity, as higher SampEn values and a shift toward increased contributions from automatic sensory systems have been demonstrated in dual-task settings. In order to understand the cortical component of postural control, functional near-infrared spectroscopy has been used to measure cortical activation during postural control conditions. However, the neural correlates of automatic postural behaviour have yet to be fully investigated. Therefore, the purpose of this study is to confirm the presence of automatic postural control through static and dynamic balance measures, and to investigate the prefrontal cortex activation when concurrently performing quiet standing and the auditory cognitive tasks of varied difficulty.MethodEighteen healthy young adults (21.4 ± 3.96 yo), 12 females and 6 males, with no balance deficits were recruited. Participants were instructed to either quietly stand on a force platform (SM), perform three cognitive tasks while seated (SC) or perform both aforementioned tasks concurrently (DT).ResultsResults supported automatic postural control with lower area and standard deviation of center-of-pressure in DT conditions compared to SM. As for SampEn and the wavelet analysis, DT conditions demonstrated greater values than SM, and a shift from vision to a cerebellar contribution. For the most difficult cognitive task, the DNS task, a trend toward significantly lower right hemisphere prefrontal cortex activation compared to left hemisphere activation in DT was found, potentially representing a decrease in cognitive control, and the presence of automaticity.ConclusionThese findings suggest that the simultaneous performance of a difficult cognitive task and posture yields automatic postural behaviour, and provides insight into the neural correlates of automaticity.     

Noncontingent positive and negative feedback during maximal exercise.

A closed skill, maximal effort on a bicycle ergometer was used to study the effects of noncontingent external feedback on performance, perceived effort, and the subject's assessment of the quality and accuracy of the feedback. The 47 subjects included elite athletes as well as physical education majors. They were asked to perform a series of 5 60-sec. trials of maximal effort, trials which included positive, negative, positive and negative, and no-feedback conditions. Although there were no significant effects on performance for the various feedback conditions, subjects judged the positive feedback favourably and as accurate, but negative feedback was judged unfavourably and considered to be inaccurate. This result is seen as supportive of the 1982 McCarrey, et al. supposition that successful athletes may have less need to internalize attributions of effect.