Murphy Niamh M, Ni Dhuinn Melanie, Browne Philip A, Orathaille Maoilíosa M
Centre for Health Behaviour Research, Department of Health, Sport and Exercise Science, School of Health Sciences, Waterford Institute of Technology, Cork Road, Waterford, Ireland.
J Adolesc Health. 2006 Oct;39(4):508-14. doi: 10.1016/j.jadohealth.2006.01.008. Epub 2006 Jul 10.
To investigate the effect of a six-month teacher-led osteogenic physical activity program, vs. a self-led activity program, on ultrasound measurements of bone in inactive teenage girls.
Ninety sedentary girls [mean (SD) age 16.3 (.6) years] were identified from 300 assessed for physical activity across five schools in southeast Ireland. Schools were matched and randomly assigned to a teacher-led physical activity (TLPA) program, a self-led physical activity (SLPA) program, or a control group. Broadband ultrasound attenuation (BUA), speed of sound (SOS), and os calcis stiffness index (OCSI) were measured using a portable ultrasound machine. Anthropometry, aerobic fitness, calcium intake, and physical activity were assessed, and focus groups held one month after program completion. Descriptive statistics, paired t-tests, and analysis of variance were used to analyze the data.
Both intervention groups demonstrated significant improvements (p < .05) in BUA, SOS, OCSI and aerobic fitness, i.e., TLPA: +14.9%, +21.9%, + 15.9%, and +8.5%, respectively, and SLPA: +10.6%, +30.3%, + 15.6%, and +5.1%, respectively, with no change in controls. Differences between intervention groups and controls were significant for BUA and OCSI (p < .05). TLPA and SLPA groups engaged in an average of 4.5 and 3.4 hours/week of physical activity, respectively, over the intervention period. The SLPA group continued to exercise after the intervention had ceased, whereas the TLPA group did not.
Previously inactive teenage girls can adhere to an osteogenic activity program whether supervised or directing their own activity. Longer-term, sustainable initiatives with this age group are needed and might focus on developing personal skills for physical activity.
研究由教师指导的为期六个月的成骨体育活动计划与自主体育活动计划相比，对不活跃的青少年女孩骨骼超声测量结果的影响。
从爱尔兰东南部五所学校接受体育活动评估的300名女孩中，挑选出90名久坐不动的女孩[平均（标准差）年龄16.3（0.6）岁]。学校进行匹配后，随机分为教师指导体育活动（TLPA）组、自主体育活动（SLPA）组或对照组。使用便携式超声仪测量宽带超声衰减（BUA）、声速（SOS）和跟骨硬度指数（OCSI）。评估人体测量学指标、有氧适能、钙摄入量和体育活动情况，并在计划完成后一个月进行焦点小组讨论。采用描述性统计、配对t检验和方差分析对数据进行分析。
两个干预组的BUA、SOS、OCSI和有氧适能均有显著改善（p < 0.05），即TLPA组分别提高了14.9%、21.9%、15.9%和8.5%，SLPA组分别提高了10.6%、30.3%、15.6%和5.1%，而对照组无变化。干预组与对照组在BUA和OCSI方面的差异具有统计学意义（p < 0.05）。在干预期间，TLPA组和SLPA组平均每周分别进行4.5小时和3.4小时的体育活动。干预停止后，SLPA组继续锻炼，而TLPA组没有。
以前不活跃的青少年女孩无论是在监督下还是自主进行活动，都能坚持成骨活动计划。对于这个年龄组，需要开展长期、可持续的倡议，可能应侧重于培养体育活动的个人技能。
