Biomedical subjects

Gregory S Kolt

Publications and source records attributed to Gregory S Kolt.

7 recordsLinked to original sources

PubMed2006

Pedometer accuracy in physical activity assessment of preschool children.

Yamax SW-200 pedometer validity during unstructured free play was assessed in 13 preschool children aged 4.1+/-0.6 years using the Children's Activity Rating Scale (CARS). Pedometer validity and hip placement reliability were also assessed during straight line walking. Data were analysed using regression analyses, 95% upper and lower prediction intervals and 95% limits of agreement. The prediction intervals for pedometry were wide when using the CARS as a criterion. Limits of agreement and prediction intervals for directly observed step counts were also wide for pedometers, calling into question their acceptability for use with preschoolers. Limitations of employing the CARS direct observation approach as a criterion measure of physical activity are also discussed.

Child, Preschool↗

PubMed2006

Physical activity: what do high school students think?

PURPOSE: To explore the views high school students have about various physical activity contexts and their ideas of potential physical activity promoting strategies. METHODS: Forty-four students from New Zealand high schools with a low decile rating participated in one of nine focus groups. All groups were separated by gender and ethnicity (Maori, New Zealand European). A standardized semi-structured schedule that included key questions and prompts was used. Thematic induction of the raw data was conducted using the long table approach. RESULTS: Perceived benefits of physical activity participation centered on fun, achievement, and physical-related factors. Key barriers to physical activity engagement included lack of peer social support and low accessibility to, and availability of, physical activity opportunities. The structure of physical education (PE) classes was a barrier noted by females. Distance was consistently articulated as a barrier to commuting actively to school. Reflective of the barriers raised by participants, self-identified strategies to promote physical activity participation included environmental modifications such as (1) increasing social support from peers, (2) improving availability of, and accessibility to, activities at school and in their neighborhood, (3) providing organized activities at school, and (4) restructuring physical education classes. CONCLUSION: In line with the current understandings of barriers to physical activity participation, youth perceptions were focused toward environmental factors, both social and physical, thereby supporting further development of environment-focused interventions. The potential of the peer, school, neighborhood, and home strategies reported in our study need to be considered in future initiatives targeting youth physical activity.

Adolescent↗

PubMed2006

An overview and process evaluation of TeleWalk: a telephone-based counseling intervention to encourage walking in older adults.

Despite the benefits associated with a physically active lifestyle, many older adults are insufficiently active to achieve health gain, and also exhibit decreased activity levels with age. Insufficient physical activity in this population is associated with increased morbidity, mortality and demand on health care services and expenditure. There is a clear need for effective intervention to encourage physical activity in older adults. The aim of this paper is to describe the development and participant evaluation of a randomized controlled trial of TeleWalk, a telephone-based motivational counseling intervention to encourage physical activity in adults aged 65 years and older. Participants (N = 186, mean age 74 +/- 6 years) were recruited through their General Practitioner (primary care physician) and randomized to either receive eight telephone counseling sessions and related printed materials over 3 months (intervention group) or participate in outcome assessments only (control group). Intervention group participants were mailed an anonymous evaluation questionnaire on intervention completion. A high response rate was achieved (70%). All respondents (100%) agreed or strongly agreed that a good overall level of service and support was provided, and that the counselor was understanding and supportive. Nearly all respondents agreed or strongly agreed that the service was professional, the counselor advice was helpful and motivating and the information provided was relevant (97, 95 and 89%, respectively). Most (87%) agreed or strongly agreed that the telephone calls encouraged them to be physically active. Among the participants who received printed material, most agreed or strongly agreed that these encouraged them to become or remain active. Findings from this evaluation can be used to inform such interventions and ensure their relevance to community-dwelling older adults.

Aged↗

PubMed2005

The mechanisms of massage and effects on performance, muscle recovery and injury prevention.

Many coaches, athletes and sports medicine personnel hold the belief, based on observations and experiences, that massage can provide several benefits to the body such as increased blood flow, reduced muscle tension and neurological excitability, and an increased sense of well-being. Massage can produce mechanical pressure, which is expected to increase muscle compliance resulting in increased range of joint motion, decreased passive stiffness and decreased active stiffness (biomechanical mechanisms). Mechanical pressure might help to increase blood flow by increasing the arteriolar pressure, as well as increasing muscle temperature from rubbing. Depending on the massage technique, mechanical pressure on the muscle is expected to increase or decrease neural excitability as measured by the Hoffman reflex (neurological mechanisms). Changes in parasympathetic activity (as measured by heart rate, blood pressure and heart rate variability) and hormonal levels (as measured by cortisol levels) following massage result in a relaxation response (physiological mechanisms). A reduction in anxiety and an improvement in mood state also cause relaxation (psychological mechanisms) after massage. Therefore, these benefits of massage are expected to help athletes by enhancing performance and reducing injury risk. However, limited research has investigated the effects of pre-exercise massage on performance and injury prevention. Massage between events is widely investigated because it is believed that massage might help to enhance recovery and prepare athletes for the next event. Unfortunately, very little scientific data has supported this claim. The majority of research on psychological effects of massage has concluded that massage produces positive effects on recovery (psychological mechanisms). Post-exercise massage has been shown to reduce the severity of muscle soreness but massage has no effects on muscle functional loss. Notwithstanding the belief that massage has benefits for athletes, the effects of different types of massage (e.g. petrissage, effleurage, friction) or the appropriate timing of massage (pre-exercise vs post-exercise) on performance, recovery from injury, or as an injury prevention method are not clear. Explanations are lacking, as the mechanisms of each massage technique have not been widely investigated. Therefore, this article discusses the possible mechanisms of massage and provides a discussion of the limited evidence of massage on performance, recovery and muscle injury prevention. The limitations of previous research are described and further research is recommended.

Athletic Injuries↗

PubMed2004

Why older Australians participate in exercise and sport.

Research on variables that encourage older adults to exercise is limited. This study was carried out to identify the participation motives of older Australians involved in regular exercise and sport. The 815 participants (399 men, 416 women) ranged in age from 55 to 93 years (M = 63.6, SD = 7.8) and were participating in their activities of choice at least once per week. All participants completed the Participation Motivation Questionnaire for Older Adults. The most common exercise/sport activities that participants were involved in were walking, golf, lawn bowls, tennis, and swimming. The most highly reported motives for participation were to keep healthy, liking the activity, to improve fitness, and to maintain joint mobility. Principal-components analysis of the questionnaire revealed 6 factors: social, fitness, recognition, challenge/benefits, medical, and involvement. Analyses of variance showed significant differences in reasons for participation in exercise and sport based on gender, age, education level, and occupation.

Aged↗

PubMed2004

Effects of a stress-management program on injury and stress of competitive gymnasts.

20 competitive gymnasts (17 girls, 3 boys; mean age, 14.4 +/- 3.4 yr.) were recruited from two clubs in Auckland, New Zealand. Gymnasts, who had competed at a national or international level, were divided into two groups to examine the effects of a longitudinal stress-management program on injury and stress. Those in the stress-management group took part in 12 1-hr. sessions over 24 weeks, while the control group took part in a placebo program of anthropometric measurements and lectures on nutrition. All participants completed the Life Experiences Survey and Athletic Experiences Survey at baseline, 3 mo., 6 mo. (end of intervention), and 9 mo. (3 mo. after completion of intervention). Injury data were collected prospectively by weekly self-report over the 9-mo. study. Repeated-measures analyses of covariance with age and, where applicable, the baseline measure of the dependent variable entered as covariates, indicated no significant group or group by time effects for the scores on the two surveys, or injury scores. However, given the small sample, the statistical power of the study to detect even large effects was low. Therefore, rather than concluding that the stress-management program had no effect on training hours lost to injury or on stress, upper limits were placed on the magnitude of any effects that might exist. Further research using larger samples is recommended.

Adaptation, Psychological↗

PubMed2003

Injury in the Australian sport of calisthenics: a prospective study.

The aims of this study were to determine the rate, anatomical regions, onset, severity, and type of injury in the sport of calisthenics and compare injuries reported by elite and non-elite participants. Prospective reports of injuries were collected over a 12-month period from 550 elite and non-elite calisthenics participants. The participants recorded the number of training sessions, competition, and performances per week, hours of training, and information on any injuries sustained each week during the survey period. Five hundred and fifty participants reported 190 injuries during the survey period, 0.4 injuries per participant year or 0.3 injured participants per participant year. The odds ratio of injury in the elite to the non-elite group was 2.0 (95% CI 1.3 to 2.9). Injuries to the lower back (32.4% of all injuries), hip thigh and groin (25.4% of all injuries) were most common. Activities involving lumbar extension (29.8% of all injuries and 61.0% of lower back injuries) were perceived by participants to have led to injury. In general, injuries were minor and mainly involved soft tissue structures (95.6% of all injuries). Participants had difficulty in identifying why their injuries had occurred. Calisthenics participants did not report high injury rates, but activities that involve lumbar extension are implicated in low back injuries and warrant further attention

Adolescent↗