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The effectiveness of Tai Chi on the physical and psychological well-being of college students: a study protocol for a randomized controlled trial
- Guohua Zheng†1,
- Xiulu Lan†2,
- Moyi Li2,
- Kun Ling3,
- Hui Lin3,
- Lidian Chen4Email author,
- Jing Tao2,
- Junzhe Li2,
- Xin Zheng2,
- Bai Chen2 and
- Qianying Fang2
© Zheng et al.; licensee BioMed Central Ltd. 2014
Received: 6 November 2013
Accepted: 20 March 2014
Published: 17 April 2014
The physical and mental health of college-age youths tends to continuously decline around the world. It is therefore important to promote health during this period. As a traditional Chinese mind-body exercise, Tai Chi Chuan (TCC) may be an available selection. However for the college student population, the evidence is unclear as to whether TCC can be recommended as an effective exercise for promoting their physical and psychological wellbeing. Therefore high quality, rigorous, prospective, and well-controlled randomized trials are needed to further understand TCC serving as a psychological and physical intervention in college age populations.
We designed a randomized, single-blind, parallel-controlled trial with a sample size of 206 participants. All the participants who meet the inclusion criteria come from Fujian University of Traditional Chinese Medicine (FJTCM). Participants of the TCC training group will receive TCC training at a frequency of five days per week for one hour per day for 12 weeks. No specific exercise will be administered on the participants in the control group. Both physical and mental health outcomes, including balance ability, lower limb proprioception, flexibility, physical fitness, self-efficacy, psychological symptoms, attention span, stress, self-esteem, mood and mindfulness, quality of life, and quality of sleep. Safety outcomes will be evaluated by blinded operators at baseline, 12 and 24-weeks post-intervention.
This protocol presents an objective design of a randomized, single-blind trial that will test the effectiveness and safety of TCC on the physical and psychological wellbeing of college students. If the outcome is positive, the results will provide higher quality evidence of TCC on the physical and mental health of college age populations.
Chinese Clinical Trial Registry: ChiCTR-TRC-13003328.
College students represent the future of families, communities, and countries. The college age is also a critical time in which individuals begin to take definitive steps towards independence, and is considered to be the first major transition an individual faces . However, due to the intense pressure of competition among students, their physical activity decline is evident during the first transition period into adulthood, especially in the first college year [2–4]. It is estimated that only 44% of college age students in America meet physical activity recommendations, as opposed to 68% of high school students . Similarly, the percentage of physically inactive college students is 13.5% for Taiwan, 16.8% for Hong Kong, and 28.5% for Korea . It is well know that physical activity can enhance the functioning of cardiovascular systems and have substantial benefits in reducing the risk of cardiovascular diseases [7, 8]. College students may therefore be a population at risk and susceptible to chronic diseases [9–11].
The psychological and/or mental wellbeing of college students might be ‘worse off’ than that of the general population. As a result of risky behaviors and multiple stressors, such as academic challenge, competition and achievements , various forms of mental health problems are more frequently present among college students than same-aged non student populations [13–15]. Convincing evidence has shown a marked increase in psychological distress including depression, paranoia, and hypomania among American college students over the past 50 years . Longitudinal studies of psychological distress in college students showed that, although distress levels peaked during the first year and then declined for most students, some of them manifested with severe distress levels which did not decrease over time [17, 18]. If left ignored and untreated, mental health problems may lead to students dropping out of college, attempting or committing suicide, or engaging in other risky, dangerous behaviors . However, it is estimated that only a minority of college students with mental health problems seek and receive adequate help .
The growing research continues to strengthen the idea that regular exercise or physical activities are positively associated with physical and psychological health outcomes [21, 22]. As a traditional Chinese mind-body exercise, TCC has been practiced for many centuries in China and is increasing in popularity in the West. Through deeply diaphragmatic breathing, basic slow and gentle mind-body moments, practitioners can achieve an efficiency of ‘body relaxation and mind calm’ and Tian Ren He Yi (the theory that mankind is an integral part of nature) . TCC, or meditative movement types of exercise in general may provide attractive and effective exercise alternatives for the large amount of people at a risk of preventable diseases, who live a sedentary lifestyle, and who lack the motivation to engage in more conventional exercise . Several systematic reviews have suggested that TCC may have significant improvement in balance capability, flexibility, cardiovascular and respiratory function, hypertension, osteoporosis, depression, anxiety and stress of the general population [25–33]. However, it was difficult to draw firm conclusions due to the fact that limitations or biases exist in the majority of the studies, such as small sample size or lacking rigorously randomized design . Furthermore, for young adults, (particularly the college student population) the evidence is unclear as to whether TCC can be recommended as an effective exercise for improving emotional state, psychological wellbeing and physical fitness. Therefore high quality, rigorous, prospective, well-controlled randomized trials with appropriate comparison groups and validated outcome measures are needed to further understand the effects of TCC serving as an intervention for specific psychological outcomes in college student populations. The purpose of this trial is to systematically evaluate the effects of TCC on physical and psychological outcomes of college students including mood, anxiety, psychological wellbeing, self-efficacy, and quality of life.
We designed a strict randomized controlled trial to systematically evaluate the effectiveness of TCC exercise on the physical and mental health of college students.
Sample size estimation
It is estimated that a sample size of 93 participants per group will be required, considering a 10% dropout and exit rate. Therefore, we will recruit an approximate total of 206 participants, with 103 participants in each group.
Participants and recruitment
A total of 206 participants will be recruited at FJTCM. We plan to advertise the recruitment program through advertisements on the campus bulletin board and via campus radio. Interested students will contact the research assistants and will be screened according to the inclusion and exclusion criteria. The potential participants will be required to sign an informed consent agreement if they fulfill inclusion criteria and do not have any exclusion criteria, before enrollment in this trial.
Participants have to fulfill the following criteria: aged between 16 and 25 years, a full time freshman or sophomore, and have provided written informed consent for participation in the trial.
Students would be ineligible if they meet any of the following conditions: are engaged in long term exercising TCC or other Tai Chi derived movements, are a member of the Students’ Wushu Association, Taekwondo Association, Aerobic Association or Dance Association, or suffer from severe cardiovascular or musculoskeletal disease.
Participants will be withdrawn from the trial if they present any of the following conditions: poor compliance (mean compliance < 85% at the last estimation) or noncompliance, occurrence of a serious adverse event, initiative exit are unable to progress because of sudden disease, members in the control group have regularly engaged in TCC exercise.
This study protocol adheres to the principles of the Declaration of Helsinki and has been approved by the ethics committee of FJTCM (No. 042). Written consent will be obtained from each participant before the baseline assessment. All participants will have the right to withdraw from the study at any time.
Randomization and allocation concealment
Participants will be randomly allocated to the TCC training group or the control group. Randomization will be performed at post-baseline assessment. The randomization list will be generated via the Statistical Analysis System (SAS, version 9.1) by an independent non-investigator working in the Center for EBM(Evidence-Based Medicine) of Academy of Integrative Medicine Fujian China. The allocation sequence will be concealed using password restricted files which will remain in the care of the project manager. The eligible participants will be informed of the allocation result by the project manager after post-baseline assessment.
In this trial it is impossible to blind the participants and TCC coaches. Nevertheless, we will assign a specified project manager to be in charge of the random-allocated sequence and blind code of allocation in which the TCC exercise group or control group will be replaced by the letter A or B. In addition, we will define the obligations of each investigator; the project manager and TCC coaches will not take part in the assessment outcome; and the outcome assessors and the statistical analyzer will not be involved in the participants’ recruitment and allocating. The allocation sequence and blind codes will be preserved by an independent project manager until the statistical analysis is completed.
The TCC training group
No specific exercise will be administered on the participants in the control group. They will be informed to maintain their original lifestyle.
The intervention period in this trial will last 12 weeks. All participants will be required to record physical activity diaries, including the type and intensity of physical activity or exercises, as well as the sedentary time and sleeping time everyday throughout this study.
Follow up period
During the 12-week follow up period, all of the participants will return to their original lifestyles, but be required to record their daily physical activities or sport information. The primary outcomes will be re-measured at end of follow up period.
Trial processes chart
Before enrollment (week)
TCC training phase (week)
Training end (week)
Follow up (week)
Follow up end (week)
Mood and mindfulness
Psychological symptom score
Rest heart rate
Systolic blood pressure
Diastolic blood pressure
Lower limbs proprioception
Quality of life
Quality of sleep
Primary outcome measures
Balance ability will be tested by standing with eyes open for 30 seconds and standing with eyes closed for 30 seconds via the Pro-kin system (product type: PK254P) produced by Tecnobody .S.r.l company, Italy [37, 38]. Lower limbs proprioception in both left and right legs will be tested via the Pro-kin system . Flexibility will be tested with Sit and Reach flexibility test equipment (Machine type: CSTF-TQ-5000, Zhongtitongfang Co., Ltd., Beijing, China) Self-efficacy with be tested using the self-regulatory self-efficacy scale . the psychological symptom score will be assessed by using the SCL-90 scale . Attention span will be assessed using the Schulte grid (8*8) scale. Stress will be measured using the Chinese Perceived Stress Scale .
Secondary outcomes measures
Cardiopulmonary function will be evaluated indirectly by a step test, vital capacity, blood pressure and rest heart rate. Step testing will be conducted by an electronic step test instrument (stairs with a 30 cm step height will be used for males, and 25 cm for females) (Machine type: Beijing ZhongTi Tongfang Co., Ltd., model CSTF-TZ-5000). Vital Capacity will be tested by an electronic vital capacity instrument (Machine type: Beijing ZhongTi Tongfang Co., Ltd., model CSTF-FH-5000). Blood pressure and rest heart rate will be tested by electric sphygmomanometers produced by the Omron Corporation, Dalian, China (product type: HEM-746C). Self-esteem will be assessed with self-esteem scale . Mood and mindfulness will be measured with the Profile of Mood States (POMS) . Quality of life will be tested using the WHOQOL-BREF scale , and finally, sleep quality will be measured using the Pittsburgh Sleep Quality Index (PSQI).
Any adverse events (defined as any functional lesion caused by the intervention, such as knee joint or ankle sprain, knee soreness, lumbar muscle strain and so on) will be recorded on a case report form (CRF) during the intervention period. If any adverse event occurs, the coaches or project managers will provide the corresponding treatment to the participant. The adverse events will be immediately reported to the primary investigator and ethics committee to decide if the participant needs to withdraw from the trial.
Statistical analyses plan
The primary outcomes of participants who are randomized and receive at least one treatment week will be carried out using the intention-to-treat (ITT) analysis. Per-protocol subject analysis (PPS) of the primary outcomes will include participants who have completed the 24-week study without major protocol violations and have a compliance rate of > 85%. We will compare the results of the ITT with that PP analysis to check whether the results are consistent or not. The continuous variables will be expressed using means with standard deviations or medians with ranges. For the variables with a normal distribution, statistical comparisons between the groups will be made by using a t test. If the variables have a non-normal distribution of ordinal level, statistical comparison between groups will be made using the Mann–Whitney U test. Measures with a discrete distribution will be expressed as percentages and analyzed by the χ 2 or Fisher’s exact test as appropriate. A general linear model or logistic regression model will be applied to adjust the confounding influence if necessary.
All statistical tests will be performed using IBM SPSS 21.0 (version 21.0, IBM Corp., New York, NY, United States) with bilateral inspection. A p value of less than or equal to 0.05 will be considered as statistically insignificant.
The aim of this trial is to evaluate the effect of TCC on the physical and mental health of college students. The trial is supported by the ‘Traditional Chinese Exercises Program’ from the State Administration of Traditional Chinese Medicine.
The benefits of TCC on physical and psychological health have been reported in numerous studies, however, most of them pay attention to various patients or the aged population [24, 25, 29, 30]. Furthermore, due to the poor quality of current studies, there is a lack of reliable evidence for TCC. In addition, currently few studies have reported on the association between TCC and the physical or mental health of college students.
We scrupulously designed this randomized, parallel-controlled, assessor-blinded and statistician-blinded trial to evaluate the effectiveness and safety of TCC on the physical and mental health of college students. Through a 12-week investigation with either TCC or control, results from a range of physical or psychological health assessments will provide clear information about differences in balance ability, flexibility, physical fitness, attention span self-efficacy, psychological symptoms, stress, mood and mindfulness, quality of life, quality of sleep and self-esteem between different groups. Changes of various variables before and after the intervention in this trial may strengthen evidence of TCC for the physical and psychological health of college students.
Strengths and limitations
Initially, one of strengths of this study is that strict, complete, randomization and adequate concealment will be used in our trial. An independent non-investigator will conduct the randomization. Moreover, project manager will keep the allocation from the screeners, as well as outcome assessors and data analysts until the whole study term is done. Furthermore, we will rigorously perform quantity control to ensure the power. We will protect our participants’ information and outcomes by using password restricted files. Every training course will be supervised by a project manager to make sure coaches and participants perform every action seriously. We will also pay a return visit during the study to ensure participants record information in the diaries in timely and conscientiousness manner.
Secondly, the main limitation of this protocol is obvious. Ideally everyone involved in an RCT should be blinded but this is not always feasible in non-pharmacological trials . Although it is impossible to carry out blinding to both the coaches and participants in this trial, we attempt to decrease possible bias by blinding both outcome assessors and data analysts.
In summary, we have developed a protocol with a randomized, parallel-controlled design to systematically evaluate the effectiveness of TCC for the physical and mental health of the college student population. If our study demonstrates a significant intervention effect, this would provide strong evidence for the application of TCC among the college student population.
Status at time of submission of this article: recruiting.
This project is supported by Rehabilitation Research Center of Fujian province and Rehabilitation Research Center for Traditional Chinese Medicine, State Administration of Traditional Chinese Medicine of the People’s Republic of China. This project is also supported by ‘the Special Scientific Research Fund of Public Welfare Profession of China (Grant No. 201307004)’ from the Ministry of Finance of the People’s Republic of China.
- Brooks JH, DuBois DL: Individual and environmental predictors of adjustment during the first year of college. J College Stud Dev. 1995, 13: 347-360.Google Scholar
- Kwan MY, Cairney J, Faulkner GE, Pullenayegum EE: Physical activity and other health-risk behaviors during the transition into early adulthood: a longitudinal cohort study. Am J Prev Med. 2012, 42: 14-20. 10.1016/j.amepre.2011.08.026.View ArticlePubMedGoogle Scholar
- Brevard PB, Ricketts CD: Residence of college students affects dietary intake, physical activity, and serum lipid levels. J Am Diet Assic. 1996, 96: 35-38. 10.1016/S0002-8223(96)00011-9.View ArticleGoogle Scholar
- Haase A, Steptoe A, Sallis JF, Wardle J: Leisure-time physical activity in university students from 23 countries: associations with health beliefs, risk awareness, and national economic development. Prev Med. 2004, 39: 182-190. 10.1016/j.ypmed.2004.01.028.View ArticlePubMedGoogle Scholar
- American College Health Association. American College Health Association-National College Health Assessment Spring 2008 Reference Group Data Report (abridged): The American college health association. J Am Coll Health. 2009, 57: 477-488.View ArticleGoogle Scholar
- Seo DC, Torabi MR, Chin MK, Huang SF, Chen CK, Mok MM, Wong P, Chia M, Lee CG, Wang C: A comparison of factors associated with physical inactivity among East Asian college students. Int J Behav Med. 2012, 19: 316-323. 10.1007/s12529-011-9167-4.View ArticlePubMedGoogle Scholar
- Garber CE, Blissmer B, Deschenes MR, Franklin BA, Lamonte MJ, Lee IM, Nieman DC, Swain DP: American college of sports medicine position stand. quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: guidance for prescribing exercise. Med Sci Sports Exerc. 2011, 43: 1334-1359. 10.1249/MSS.0b013e318213fefb.View ArticlePubMedGoogle Scholar
- Barnes AS: Emerging modifiable risk factors for cardiovascular disease in women: obesity, physical activity, and sedentary behavior. Tex Heart Inst J. 2013, 40: 293-295.PubMedPubMed CentralGoogle Scholar
- Matthews CE, Chen KY, Freedson PS, Buchowski MS, Beech BM, Pate RR, Troiano RP: Amount of time spent in sedentary behaviors in the United States, 2003–2004. Am J Epidemiol. 2008, 167: 875-881. 10.1093/aje/kwm390.View ArticlePubMedPubMed CentralGoogle Scholar
- Folsom AR, Jacobs DR, Wagenknecht LE, Winkhart SP, Yunis C, Hilner JE, Savage PJ, Smith DE, Flack JM: Increase in fasting insulin and glucose over seven years with increasing weight and inactivity of young adults: the CARDIA study: coronary artery risk development in young adults. Am J Epidemiol. 1996, 144: 235-246. 10.1093/oxfordjournals.aje.a008918.View ArticlePubMedGoogle Scholar
- Norman JE, Bild D, Lewis CE, Liu K, West DS, CARDIA Study: The impact of weight change on cardiovascular disease risk factors in young black and white adults: the CARDIA Study. Int J Obes Relat Metab Disord. 2003, 27: 369-376. 10.1038/sj.ijo.0802243.View ArticlePubMedGoogle Scholar
- Mikolajczyk RT, Brzoska P, Maier C, Ottova V, Meier S, Dudziak U, Ilieva S, El Ansari W: Factors associated with self-rated health status in university students: a cross-sectional study in three European countries. Public Health. 2008, 8: 215-225.PubMedPubMed CentralGoogle Scholar
- Tosevski DL, Milovancevic MP, Gajic SD: Personality and psychopathology of university students. Curr Opin Psychiatry. 2010, 23: 48-52. 10.1097/YCO.0b013e328333d625.View ArticlePubMedGoogle Scholar
- Gore FM, Bloem PJ, Patton GC, Ferguson J, Joseph V, Coffey C, Sawyer SM, Mathers CD: Global burden of disease in young people aged 10–24 years: a systematic analysis. Lancet. 2011, 377: 2093-2102. 10.1016/S0140-6736(11)60512-6.View ArticlePubMedGoogle Scholar
- Kitzrow MA: The mental health needs of today’s college students: challenges and recommendations. NASPA J. 2003, 41: 165-179.View ArticleGoogle Scholar
- Twenge JM, Gentile B, DeWall CN, Ma D, Lacefield K, Schurtz DR: Birth cohort increases in psychopathology among young Americans, 1938–2007: a cross-temporal meta-analysis of the MMPI. Clin Psychol Rev. 2010, 30: 145-154. 10.1016/j.cpr.2009.10.005.View ArticlePubMedGoogle Scholar
- Stallman HM: Prevalence of psychological distress in university students-implications for service delivery. Aust Fam Physician. 2008, 37: 673-677.PubMedGoogle Scholar
- Kuruppuarachchi KA, Kuruppuarachchi KA, Wijerathne S, Williams SS: Psychological distress among students from five universities in Sri Lanka. Ceylon Med J. 2002, 47: 13-15.PubMedGoogle Scholar
- Cook LJ: Striving to help college students with mental health issues. J Psychosoc Nurs Ment Health Serv. 2007, 45: 40-44.PubMedGoogle Scholar
- Hunt J, Eisenberg D: Mental health problems and help-seeking behavior among college students. J Adolesc Health. 2010, 46: 3-10. 10.1016/j.jadohealth.2009.08.008.View ArticlePubMedGoogle Scholar
- Penedo FJ, Dahn JR: Exercise and well-being: a review of mental and physical health benefits associated with physical activity. Curr Opin Psychiatry. 2005, 18: 189-193. 10.1097/00001504-200503000-00013.View ArticlePubMedGoogle Scholar
- Valois RF, Zullig KJ, Huebner ES, Drane JW: Physical activity behaviors and perceived life satisfaction among public high school adolescents. J Sch Health. 2004, 74: 59-65. 10.1111/j.1746-1561.2004.tb04201.x.View ArticlePubMedGoogle Scholar
- Liu JY: The effect of Tai Chi Chuan on body-mind. Tamkang. 1975, 13: 217-223.Google Scholar
- Jahnke R, Larkey L, Rogers C, Etnier J, Lin F: A comprehensive review of health benefits of qigong and tai chi. Am J Health Promot. 2010, 24: 1-25.View ArticleGoogle Scholar
- Rand D, Miller WC, Yiu J, Eng JJ: Interventions for addressing low balance confidence in older adults: a systematic review and meta-analysis. Age Ageing. 2011, 40: 297-306. 10.1093/ageing/afr037.View ArticlePubMedPubMed CentralGoogle Scholar
- Verhagen AP, Immink M, van der Meulen A, Bierma-Zeinstra SM: The efficacy of Tai Chi Chuan in older adults: a systematic review. Fam Pract. 2004, 2: 107-113.View ArticleGoogle Scholar
- Lee MS, Pittler MH, Shin BC, Ernst E: Tai chi for osteoporosis: a systematic review. Osteoporos Int. 2008, 9: 139-146.View ArticleGoogle Scholar
- Dalusung Angosta A: The impact of Tai Chi exercise on coronary heart disease: a systematic review. Am Acad Nurse Pract. 2011, 23: 376-381. 10.1111/j.1745-7599.2011.00597.x.View ArticleGoogle Scholar
- Yeh GY, Wang C, Wayne PM, Phillips R: Tai Chi exercise for patients with cardiovascular conditions and risk factors: a systematic review. Cardiopulm Rehabil Prev. 2009, 29: 152-160. 10.1097/HCR.0b013e3181a33379.View ArticleGoogle Scholar
- Wang C, Bannuru R, Ramel J, Kupelnick B, Scott T, Schmid CH: Tai Chi on psychological well-being: systematic review and meta-analysis. BMC Complement Altern Med. 2010, 10: 23-10.1186/1472-6882-10-23.View ArticlePubMedPubMed CentralGoogle Scholar
- Li F, Duncan TE, Duncan SC, McAuley E, Chaumeton NR, Harmer P: Enhancing the psychological well-being of elderly individuals through Tai Chi exercise: a latent growth curve analysis. Struct Equ Model. 2001, 8: 53-83. 10.1207/S15328007SEM0801_4.View ArticleGoogle Scholar
- Mustian KM, Katula JA, Gill DL, Roscoe JA, Lang D, Murphy K: Tai Chi Chuan, health-related quality of life and self-esteem: a randomized trial with breast cancer survivors. Support Care Cancer. 2004, 12: 871-876. 10.1007/s00520-004-0682-6.View ArticlePubMedGoogle Scholar
- Lee L, Lee DT, Woo J: Effect of Tai Chi on state self-esteem and health-related quality of life in older Chinese residential care home residents. J Clin Nurs. 2007, 16: 1580-1582. 10.1111/j.1365-2702.2007.02061.x.View ArticlePubMedGoogle Scholar
- Wang C, Collet JP, Lam P: The effect of Tai Chi on health outcomes in patients with chronic conditions: a systematic review. Arch Intern Med. 2004, 164: 493-501. 10.1001/archinte.164.5.493.View ArticlePubMedGoogle Scholar
- Physical activity and cardiovascular health: NIH consensus development panel on physical activity and cardiovascular health. JAMA. 1996, 276: 241-246.View ArticleGoogle Scholar
- Tong YH: Chinese national standard movements of Tai Chi competition 24. 2009, Chengdu: chengdu era pressGoogle Scholar
- Wang S, Yang J, Zhu Y, Zhang LX, Ding XJ, Cao TL, Wang T: The reliability and validity study of balance feedback training instrument for brain injury patients with hemiplegia static balance test. Chin J Rehabil Med. 2011, 26: 1035-1038.Google Scholar
- Bagnato S, Boccagni C, Boniforti F, Trinchera A, Guercio G, Letizia G, Galardi G: Motor dysfunction of the “non-affected” lower limb: a kinematic comparative study between hemiparetic stroke and total knee prosthesized patients. Neurol Sci. 2009, 30: 107-113. 10.1007/s10072-009-0031-0.View ArticlePubMedGoogle Scholar
- Hu JP, Yi WC, Li RY, Jiang XL, Yi WL: First exploration of the reliability of the proprioception preliminary quantitative assessment. Chin J Phys Med Rehabil. 2012, 34: 34-37.Google Scholar
- Zhang JX, Schwarzer R: Measuring optimistic self-beliefs: a Chinese adaptation of the general self-efficacy scale. Psychologia. 1995, 38: 174-181.Google Scholar
- Xiangdong W: Self-reporting inventory. Chin Ment Health J. 1993, 31-36. SupplGoogle Scholar
- Yang T, Huang H: Epidemiological study of urban residents’ psychological pressure during the social transformation. Chin J Epidemiol. 2003, 24: 760-764.Google Scholar
- Yifu J: The self-esteem scale (SES). Chin Ment Health J. 1993, 7: 251-Google Scholar
- Beili Z: Brief introduction of POMS scale and its model for China. Journal of Tian Jin University of Sport. 1995, 10: 35-37.Google Scholar
- Fang JQ: Quality of life measurement method and application. 2000, Beijing: Beijing Medical University pressGoogle Scholar
- Boutron I, Moher D, Altman DG, Schulz KF, Ravaud P, CONSORT Group: Extending the CONSORT statement to randomized trials of nonpharmacologic treatment: explanation and elaboration. Ann Intern Med. 2008, 148: 295-309. 10.7326/0003-4819-148-4-200802190-00008.View ArticlePubMedGoogle Scholar
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