Correlation of the muscular strength of ankle joint and the cross-sectional area of achilles tendon with forced training in infantry soldiers
- VernacularTitle:步兵踝关节肌力和跟腱横截面积与强化训练的关系
- Author:
Jinwei AI
;
Changlin HUANG
;
Yeping HAN
;
Yujing CAO
;
Jianfu ZHANG
;
Pei LI
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2007;11(5):984-986
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND: Tendon injury and dysfunction often occurs in military training, but the exactly epidemiological, pathological, physiological, healing and remodeling mechanisms of tendonopathy is still unclear, even the pain due to chronic tendon dysfunction should be further studied.OBJECTIVE: To evaluate the effect of forced training on the muscular strength of ankle joint and the cross-sectional area (CSA) of achilles tendon of infantry soldiers, and look for effective training methods.DESIGN: One-sample contrasting study.SETTING: Fourth Military Medical University of Chinese PLA; InStitute of Military Training-related Medical Sciences, the 150 Hospital of Chinese PLA.PARTICIPANTS: The study was carried out in the Institute of Military Training-related Medical Sciences, the 150 Hospital of Chinese PLA from March to June 2004. Thirty male light infantry recruits and thirty one-year-trained male soldiers were regarded as recruit group and one-year soldier group. The enlisted age ranged from 17 to 18 years. Recruits did not have the history of special training and injury of ankle joints. All of them were able to undertake routinely physical training.METHODS: The recruits participated in routinely physical trainings, such as grenade throwing and 5 km cross-country race, and forced trainings, such as dorsiflexors and plantarflexors on ankle joint, twice a day for each training item for 8 successive weeks. The forced training included calf raise for 50 times and sit-ups for 50 times on 45° arched board.Moreover, one-year soldiers were undertaken routinely physical trainings. Eight weeks later, the isokinetic testing of ankle joint and CSA of achilles tendon were measured before and after trainings.MAIN OUTCOME MEASURES: Comparisons of CSA of achilles tendon and changes of muscular strength of ankle joint between recruits before routine training and after 8-week forced training and one-year soldiers after routine training.RESULTS: All 60 soldiers were involved in the final analysis. Partial correlation was showed between CSA and body weight (r =0.446, P=0.015), and there was no difference in CSA before and after training. The relative peak torque, endurance and torque acceleration energy of plantarflexors, dorsiflexors and evertors were distinctively higher in recruit group and one-year soldier group after training than those in recruit group before training (P ＜ 0.05); however, there was no difference between recruit group and one-year soldier group after training.CONCLUSION: Forced training method can improve physical readiness in a short time. No changes of CSA of achilles tendon after training show that the improvement of ankle muscular strength may be through the rebuilding of its inner-structure rather than through the hypertrophy of the tendon.
