Effects of Closed and Open Kinetic Chain Exercise Induced-Localized Fatigue on Static and Dynamic Balance in Trained Individuals.
One of the key objectives of coaches and professional athletes is to maximize the athletic and health-related performance in daily living and competitions; hence, it seems necessary to find the possible ways to increase the athletic potentials. A growing literature supports the positive effects of aerobic exercise (1-3), high intensity interval training (HIIT) (4), aquatic exercises (5) on physical fitness and health-related factors in different age groups. Onthe other hand, high prevalence of injury caused by a variety of exercises has been reported. In this regard, resistance exercises with the intention of increasing physical fitness have been often utilized by athletes. Moreover, the development of fatigability during this type of exercise is epidemic that disturbs the motor control, especially in balance power (6-8). There are several studies reporting that lower extremities fatigue would reduce postural control. Shanbehzadeh et al. stated that functional fatigue-induced alterations of motor control can be found in males and females (9). In contrary, no relationship was found between muscular fatigue and balance in other research (10, 11). It was also suggested in a study that body composition changes at the age of 19 - 21 years could decrease the physical fitness that necessitates the importance of strength training (12). Given the importance of making the athlete powerful in motor control, closed and open kinetic chain exercises are commonly applied by coaches and trainers. Closed kinetic chain (CKC) exercises refer to those activities where the distal part of the lower limb is fixed, while in open kinetic chain (OKC) condition, distal segment of the limb is free to move (13). Given the role of fatigue on balance impairment, which may lead to injury, the study was to investigate the effects of closed and open kinetic chain exercise-induced localized fatigue (lower body muscles) on static and dynamic balance in trained individuals.
30 healthy boys with meanage of 19.7 [+ or -] 1.2 years participated voluntarily in the experimental study with pre and post-test design. Subjects were randomly divided into two groups including OKC (n = 15), and CKC groups (n = 15). The inclusion criteria were lack of lower limb injury and no history of physical and physiological limitations hampering the training protocol.
Static and dynamic balance were measured by the Borg Fatigue Scale and measured before and after open and closed chain fatigue protocol. Fifteen in Borg scale shows 75% to 85% of the maximum oxygen consumption, considered approximately as the threshold of lactate (14). Static and dynamic balance were measured using the Balance Error Scoring System (BESS) the Star Excursion Balance test (SEBT) in eight directions respectively (11, 15). OKC and CKC fatigue protocols are seen in Table 1. One-repetition maximum (1RM) was used by Equation 1. 60% of 1RM was intervened in both OKC and CKC as exercise intensity (14, 16).
1RM = Weight/[1 - 0.02 (Rep)] (1)
The study was approved by the ethics committee board of Imam Khomeini International University (ID: 17628). Informed consent was signed by subjects prior to the beginning of study. The Kolmogorov-Smirnov test was used to examine the data normality and the data was analyzed using two-way repeated measures ANOVA comparing pretest and posttest scores among all groups and conditions at the significance level of P [less than or equal to] 0.05.
General characteristics of subjects are presented in Table 2. No significant difference was found in general traits in baseline (independent t-test results) (P > 0.05).
The dependent variables were the BESS error scores and SEBT scores, and our independent variables were group, time, BESS and SEBT conditions. Analysis of BESS scores with the groups combined revealed significant time ([F.sub.1,29] = 112.3, P < 0.01) and BESS condition ([F.sub.5,145] = 706.5, P < 0.001) main effects and a time-by-BESS condition interaction ([F.sub.5,145] = 821.3, P < .001).
As seen in Table 3, a significant difference was found between the pre-test (before fatigue) and the post-test (after fatigue) in static balance of both OKC and CKC. Furthermore, there was a significant difference between static balance of OKC and CKC in posttest. Localized fatigue in the CKC had a more negative effect on static balance.
Analysis of SEBT scores with the groups combined revealed significant time ([F.sub.1,29] =244.8, P< 0.05) and SEBT condition ([F.sub.7,203] = 841.1, P < 0.001) main effects and a time-by-SEBT condition interaction ([F.sub.7,203] = 708.6, P < 0.001).
According to Table 4, there was a significant difference between the pre-test (before fatigue) and the post-test (after fatigue) of both groups in the dynamic balance. Independent t-test also showed a significant difference between the two groups. Localized fatigue in OKC had a more negative effect on dynamic balance (Table 4).
In the current study, changes of static and dynamic balance due to fatigue were studied in trained persons. Although the effect of fatigue on balance was studied before, there is no study examining fatigue effect on balance in OKC and CKC of trained individuals. In summary, different effects of exercises on balance may associate with intensity and duration of exercise, constant or variable intensity in exercise protocols, metabolic demands, metabolic acidosis, impairment in somatosensory and vestibular system, hyperventilation, and dehydration (17). The results showed that fatigue had deleterious effect on static and dynamic balance following OKC and CKC. The obtained results are in line with Mousavi et al. (18), Surenkok et al. (19) in terms of balance impairment after fatigue, while inconsistent with Zech et al. who found that fatigue had no effect on dynamic balance (20). However, the interesting point is that to the best knowledge of the authors, no study considered the effect of OKC and CKC induced fatigue on the static and dynamic blance of trained persons. In addition, the majority of research investigated the elite athletes, while we studied the trained people. One possible reason for disturbance of static imbalance following CKC could be attributed to weight bearing in this condition as the legs are in the position of bearing the weight on the ground (13). In the present study, the fatigue in OKC had a more negative effect on dynamic balance. Apparently, In OKC condition, fatigue occurrs due to putting the stress on joints which disrupts the normal functioning of the joints and functional muscles of the joint which results in a more negative effect on dynamic balance compared to the static one. There were a number of limitations to our study including the control of mental functioning, sleep and rest hours, nutrition and motivation in subjects. On the other hand, a larger study sample size across individuals with different levels of physical fitness is offered in future studies.
As a conclusion, it is highly recommended that coaches and athletes should be aware of the possible risks of incorporating the mere trunk and lower muscles training into programs owing to high possibility of injury caused by localized fatigue. Therefore, diverse training components of kinetic chains should be applied.
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Masoud Mirmoezzi (1) and Morteza Taheri (2, *)
(1) Department of Sport and Sport Technology, Islamic Azad University, Tehran, Iran
(2) Department of Sport Sciences, Imam Khomeini International University, Qazvin, Iran
(*) Corresponding author: Assistant Professor, Department of Sport Sciences, Imam Khomeini International University, Qazvin, Iran. Email: firstname.lastname@example.org
Received 2018 June 01; Revised 2018 October 06; Accepted 2018 October 13.
Table 1. Open Chain and Closed Chain Fatigue Protocol Kinetic Anterior Type of Posterior Type of RM, Sets Chain Muscles Movement Muscles Movement % Open Quadriceps Leg Hamstring Lying Leg 60 4 sets and extension Curl each one is up to exhaustive Closed Quadriceps Machine Hamstring Russian 60 4 sets and squat Leg Curls each one is up to exhaustive Kinetic Rest, Chain min Open 3 Closed 3 Table 2. Individual Characteristics of Subjects in Baseline Groups Height, cm Foot Length, cm Weight, kg OKC 171.75 [+ or -] 4.74 64.5 [+ or -] 10.12 69.87 [+ or -] 6.24 CKC 169.37 [+ or -] 5.57 61.5 [+ or -] 12.72 64.87 [+ or -] 7.01 P value 0.112 0.091 0.147 Groups Age, y OKC 18.37 [+ or -] 1.22 CKC 19.02 [+ or -] 0.72 P value 0.251 Table 3. Balance Error Scoring System (BESS), Error Scores for Each Time Point by Group (a) Surface and Condition OKC Pre-Test Post Test Firm Double leg 0.00 [+ or -] 0.00 0.09 [+ or -] 0.12 (b) Single leg 2.36 [+ or -] 2.77 3.98 [+ or -] 1.09 (b) Tandem 0.47 [+ or -] 0.81 0.96 [+ or -] 0.42 (b) Foam Double leg 0.00 [+ or -] 0.00 0.52 [+ or -] 0.90 (b) Single leg 4.20 [+ or -] 2.16 6.55 [+ or -] 1.96 (b) Tandem 2.53 [+ or -] 3.45 4.72 [+ or -] 2.21 (b) Total of firm surface 2.83 [+ or -] 3.10 5.53 [+ or -] 3.98 (b) Total of foam surface 3.73 [+ or -] 5.13 11.29 [+ or -] 4.68 (b) Total errors 9.56 [+ or -] 7.31 16.82 [+ or -] 6.14 (b) Surface and Condition Pre-Test Post Test Firm Double leg 0.00 [+ or -] 0.00 0.08 [+ or -] 0.20 (b) Single leg 2.45 [+ or -] 2.61 6.22 [+ or -] 0.59 (b,c) Tandem 0.54 [+ or -] 1.10 1.48 [+ or -] 0.84 (b,c) Foam Double leg 0.00 [+ or -] 0.00 0.70 [+ or -] 0.98 (b) Single leg 5.24 [+ or -] 1.66 9.98 [+ or -] 2.35 (b,c) Tandem 2.71 [+ or -] 5.55 6.54 [+ or -] 2.32 (b,c) Total of firm surface 2.63 [+ or -] 2.28 7.78 [+ or -] 1.44 (b,c) Total of foam surface 7.98 [+ or -] 4.97 17.22 [+ or -] 5.87 (b,c) Total errors 10.61 [+ or -] 8.76 25.00 [+ or -] 7.14 (b,c) (a) Values are expressed as mean [+ or -] SD. (b) Significantly different from pretest. (c) Significantly different from test group (OKC, CKC). Table 4. Star Excursion Balance Test (SEBT) Values in Eight Directions (in Centimeter) Directions OKC Pre-Test Post Test Anterior 75.70 [+ or -] 3.77 73.19 [+ or -] 2.70a Anterolateral 75.71 [+ or -] 1.65 72.01 [+ or -] 0.74a Lateral 78.38 [+ or -] 1.25 75.86 [+ or -] 1.26a Posterolateral 72.05 [+ or -] 0.77 70.09 [+ or -] 1.37a Posterior 82.70 [+ or -] 2.02 80.28 [+ or -] 1.45a Posteromedial 76.17 [+ or -] 1.45 74.78 [+ or -] 2.06a Medial 72.98 [+ or -] 1.54 71.04 [+ or -] 1.87a Anteromedial 74.97 [+ or -] 0.67 71.41 [+ or -] 2.22a Mean 76.08 [+ or -] 1.42 73.58 [+ or -] 1.01a Directions CKC Pre-Test Post Test Anterior 74.19 [+ or -] 0.70 75.45 [+ or -] 1.14 (a,b) Anterolateral 74.01 [+ or -] 0.79 73.24 [+ or -] 1.16 (a,b) Lateral 76.86 [+ or -] 1.10 77.95 [+ or -] 0.75 (a,b) Posterolateral 84.90 [+ or -] 1.93 71.25 [+ or -] 1.34 (a,b) Posterior 83.24 [+ or -] 1.66 81.94 [+ or -] 1.16 (a,b) Posteromedial 75.71 [+ or -] 1.67 76.74 [+ or -] 0.78 (a,b) Medial 73.83 [+ or -] 1.28 74.87 [+ or -] 1.02 (a,b) Anteromedial 75.78 [+ or -] 0.97 73.54 [+ or -] 2.02 (a,b) Mean 76.07 [+ or -] 1.14 75.26 [+ or -] 1.01 (a,b) (a) Significantly different from pretest. (b) Significantly different from test group (OKC, CKC).
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|Title Annotation:||Research Article|
|Author:||Mirmoezzi, Masoud; Taheri, Morteza|
|Publication:||Asian Journal of Sports Medicine (AsJSM)|
|Date:||Dec 1, 2018|
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