Acute Inflammatory Response to a Single Bout of Resistance Exercise with or Without Blood Flow Restriction

AUTHORS

Mohammad Bani Asadi 1 , Hassan Sharifi 1 , Bahram Abedi ORCID 1 , * , Hoseyn Fatolahi ORCID 2

1 Department of Physical Education and Sport Sciences, Mahallat Branch, Islamic Azad University, Mahallat, Iran

2 Department of Physical Education, Pardis Branch, Islamic Azad University, Pardis, Iran

How to Cite: Bani Asadi M , Sharifi H , Abedi B, Fatolahi H. Acute Inflammatory Response to a Single Bout of Resistance Exercise with or Without Blood Flow Restriction, Int J Sport Stud Hlth. 2020 ; 3(2):e110594. doi: 10.5812/intjssh.110594.

ARTICLE INFORMATION

International Journal of Sport Studies for Health: 3 (2); e110594
Published Online: April 27, 2021
Article Type: Research Article
Received: October 25, 2020
Accepted: February 27, 2021
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Abstract

Background: The effectiveness of resistance training (RT) with blood flow restriction (BFR) is limited from the health perspective.

Objectives: This study aimed to investigate the acute inflammatory response to a single bout of RT with or without BFR.

Methods: Twenty-four non-athletic male students were randomly divided into 3 groups (n = 8), including: (1) high intensity (HIRT- 80% of 1-RM: 3 × 10 R), (2) low intensity (40% of 1-RM: 3 × 30 R) with BFR (180 mmHg) (LIRT + BFR) and (3) LIRT.

Results: Significant increase for IL1-β (p = 0.001), IL-6 (P = 0.001), TNF-α (P = 0.002), CRP (P = 0.007), ICAM1 (P = 0.016), HCY (P = 0.008) were observed. These responses in the HIRE and LIRT + BFR groups were significantly higher than in the LIRT group respectively (P ≤ 0.05).

Conclusions: The LIRT + BFR has similar effects to HIRT and can be used in rehabilitation training. The gradual overload and proper recovery are very important due to the increase in acute inflammatory responses.

1. Background

In many groups, especially adolescent boys, resistance training is considered an exercise mode. Resistance training increases muscle (hypertrophy) and reduces inflammatory indicators (1, 2). However, in response to a session of resistance exercise, a circular increase in inflammatory biomarkers has been observed (3). Blood flow restriction (BFR) is an exercise mode of resistance training. Even light activities using blood flow restriction (Katsu's light resistance training) have increased muscle strength, hypertrophy and improved physiological indicators or prevented atrophy in healthy and diseased groups (4-6). The use of low-intensity training with BFR is also appropriate for rehabilitation, as well as in the elderly who are unable to exercise vigorously (4-11). Training with BFR is such that the proximal part of the training limb is tied with a band of tape or cuff (tourniquet), thus restricting blood flow to the target area (5, 6).

Resistance training, especially in the form of BFR, has been shown to reduce oxygen delivery and increase oedema in the position used and this can increase acute inflammation (12, 13). Also, a decrease in tissue blood flow is one of the factors that increase inflammatory markers (14, 15). However, adapting to regular exercise in healthy and patient groups improves inflammatory rest levels and reduces inflammatory responses such as IL1-β, IL-6, TNF-α, CRP, sICAM1 and homocysteine (HCY) the increase in acute inflammation caused by a session of exercise activity at different intensities, especially in untrained groups or groups with risk factors, has been confirmed (12, 16-19).

One of the most important functions of the immune system is to produce soluble or cellular components called cytokines, which protect the body against any inflammatory agents. The release of cytokines, such as IL-1 and IL-6, as general and effective regulatory factors in inflammatory responses, stimulates the production and secretion of C-reactive protein (CRP) and fibrinogen from the liver (19). CRP measurement is the best way to diagnose tissue inflammation due to its rapid increase at the onset of tissue inflammation and its rapid decrease as soon as it heals (20). CRP is a plasma soluble glycoprotein that acts after infection and inflammation. Homocysteine is an amino acid that is converted to cysteine in the body (19, 20). If homocysteine cannot be converted to cysteine or methionine, the level of homocysteine will increase. Elevated homocysteine can damage the endothelium and lead to cardiovascular disease at an early age. An increase in CRP is associated with an increase in sICAM-1 and homocysteine, indicating acute inflammation (21).

According to the principles of prescribing exercise, everyone should be familiar with the effective aspects of exercise before starting physical activity and prevent its risk factors. However, this issue is often examined only in sick people, and failure to do so may lead to some risks for young people. Regular exercise will usually create physiological adaptations. But it seems necessary to study the acute response to new methods of exercise to prevent injury. Also, the importance of acute inflammatory response is revealed when we note that some young people who engage in resistance activity may have some risk factors or congenital disorders that may be compromised in response to increased inflammatory markers due to training intensity or exercise mode such as BFR. Inflammatory acute responses to resistance exercise in the form of BFR have also been less studied, and it is very difficult to achieve an integrated finding due to differences in performing methods or groups participating in studies.

2. Objectives

The present study aimed to investigate the acute inflammatory response to a single bout of resistance exercise with or without blood flow restriction.

3. Methods

In the present study, a semi-experimental method was used to implement the research design. The participants in the study were male students who had no training, no smoking, no high blood pressure or other cardiovascular diseases, and no supplements for at least six months. Examinations were performed by a specialist physician in the Central Clinic of Markazi province, Mahallat.

Twenty four students who volunteered for the study were randomly divided into three groups including (1) low-intensity resistance training (LIRT), (2) low-intensity resistance training with blood flow restriction (LIRT + BFR) (180 mmHg) and (3) high-intensity resistance training (HIRT). The details of the participants of each group are presented in Table 1.

Table 1. Characteristics of the Participants and Values of Physiological Indices Measured in the Study Groups
GroupsLow-intensity RTLow-intensity BFR RTHigh-intensity RT
Age 24.8 ± 3.0924.37 ± 2.5525.7 ± 2.91
Height (cm)175.5 ± 4.17173.6 ± 4.2171.2 ± 2.65
Weight (Kg)75 ± 6.3273.34 ± 8.774.6 ± 6.67
BMI(Kg/m2)24.43 ± 2.5424.45 ± 3.1425.42 ± 2.4

3.1. Resistance Exercise and BFR Protocol

First, one maximum repetition (1- RM) was measured and recorded using the formula:

1- RM = selective weight value1.0278-number of repetitions×1.0278

To induce blood flow restriction, a tourniquet equipped with a blood pressure monitor (54 mm wide; KAATSU Master Mini, Sato Sports Plaza, Tokyo, Japan) was used. Systolic blood pressure was adjusted to limit blood flow in the 180 mm Hg range (5, 6).

Low-intensity resistance exercise group without blood flow restriction: This group with 40% of 1RM performed four squats, chest presses, forearms and forelegs for 30 repetitions and three sets with a rest interval of 1 to 2 minutes. All exercises were done in the gym of the Islamic Azad University, Mahallat Branch, from 4 to 5:30 p.m. Low-intensity resistance exercise group with blood flow restriction: This group with 40% of 1RM performed four squats, chest presses, forearms and forelegs for 30 repetitions and three sets with a rest interval of 1 to 2 minutes.

High-intensity resistance exercise group without blood flow restriction: This group with 80% of 1RM performed four squats, chest presses, forearms and forelegs for 10 repetitions and three sets with a rest interval of 1 to 2 minutes.

3.2. Laboratory Methods

Body mass index was calculated in kg/m2 using BMI equation through measuring height (Seca 213, Germany recorded to the nearest 0.1 cm.) and weight (SECA Digital Scale Model 727: with a precision of 2 g). To measure the study variables at plasma levels, fasting blood samples were collected in a sedentary position from the brachial vein before and immediately after a session of resistance exercise in each group of participants. In the first phase, all subjects were asked not to engage in any strenuous physical activity for two days before the test. The plasma concentration of IL1-β (Biovendor Laboratorial kit, Biovendor Company, Austria), IL-6 and TNF-α (Bender MedSystems), CRP (hs-CRP kit, IBL, Germany), sICAM1 (DRG Instruments GmbH, Marburg, Germany), homocysteine (ELISA-Elabscience Biotechnology Co., Ltd., Wuhan, P. R. C. with Lot) were measured manufacturer's manual and based on the ELISA method. All experiments were performed city by the laboratory technician in the laboratory of the Central Clinic of Markazi province, Mahallat.

3.3. Statistical Analysis

To test the normality of data distribution, the Spiro-Wilk test was used. The data were calculated as the mean and standard deviation. For inferential analysis of data and to eliminate the effect of pre-test, analysis of covariance (ANCOVA) and Tukey’s post hoc tests at significance level P ≤ 0.05 were used applying SPSS 21 software.

4. Results

The comparison between the pre-test and post-test values showed an increase in IL1-β, IL-6, TNF-α, CRP, sICAM1, HCY values compared to the pre-test levels (Figure 1).The results showed significant differencesamongthe studied groups for variables inclouding IL1-β (P = 0.001, F = 16.52, η = 0.418), IL-6 (P = 0.001, F = 16.714, η = 0.504), TNF-α (P = 0.002, F = 8.229, η = 0.387), CRP (P = 0.007, F = 6.371, η = 0.349), ICAM1 (P = 0.016, F = 5.035, η = 0.321), HCY (P = 0.008, F = 6.192, η = 0.337).The results of Tukey’s post hoc test showed that the acute inflammatory responses in the HIRT and LIRT + BFR groups were significantly higher than in the LIRT group (P ≤ 0.05). However, there was no significant difference between the HIRT group and the LIRT + BFR group (Figure 1).

Figure 1. Changes in the inflammatory biomarkers in response to a single bout of resistance exercise with or without blood flow restriction. The data presented as mean and standard divination. Similar alphabetical letters indicate the same changes and different alphabetic letters indicate significant changes. (RT: Resistance training, BFR: Blood flow restriction)

5. Discussion

The present study aimed to investigate the acute inflammatory response to a single bout of resistance exercise with or without blood flow restriction. The acute inflammatory responses in the HIRT and LIRT + BFR groups were significantly higher than in the LIRT group. These changes were further influenced by the intensity of training. On the other hand, at equal intensities, the exercise mode increased the inflammatory response as BFR.

In general, adapting to exercise training reduces the baseline levels of inflammatory markers, but increase in response to a session of exercise (16, 18, 19, 22). Previous studies have shown that LIRT+BFR has the best functional and health effects (2, 8, 10). There was also no significant difference in the performance indicators between high-intensity and medium-intensity BFR cycling training (7). The findings of the present study show that the use of LIRT+BFR has less inflammatory consequences and is recommended to achieve good health. LIRT + BFR can increase muscle strength and volume without stimulating inflammatory pathways such as CRP (20).

Changes in inflammatory cytokines levels during exercise depend on age, gender, fitness, duration, intensity, type of activity, type of muscle fibre, and muscle mass used in mechanical work. Besides training status, metabolic stress, training load, rest time, repetitions, and training volume have been identified as effective training components for muscle adaptation and acute hormonal responses during resistance training (22).

The high-pressure BFR exercises reduce oxygen delivery and increase metabolic stress (12). One of the most important mechanisms for the effectiveness of BFR exercise is the creation of hypoxia and ischemia (23). Therefore increase in inflammation caused by BFR exercise can be due to tissue reperfusion involved (24). It was noted that decreased tissue blood flow and subsequent hypoxia alone could also increase inflammation (14, 15). Due to the decrease in blood flow, BFR training slows the lactate produced inside the cell causes a stronger acidic environment (One of the stimulants of testosterone secretion).

One of the effective ways of BFR training is to strengthen the antioxidant pathways and improve the performance of the sodium-potassium pump associated with ATP (7). Stimulation of anabolic pathways such as mTOR, NO, heat shock proteins (HSPs), and myostatin is also among other signaling pathways under the influence of blood flow restriction due to hypoxia and ischemia (25). The intensity of exercise through its influence on different hemodynamic, metabolic, immunological, and endocrine pathways is still one of the most important reasons for the increase in acute inflammatory responses to exercise (21, 26).

It has been stated that inflammatory responses such as CRP or sICAM have no significant relationship with physiological and anthropometric indicators and have shown independent changes (27, 28). On the other hand, an increase in some inflammatory indicators, especially IL-6, is associated with a decrease in energy reserves, which can also affect eating habits after exercise (16). In confirmation of the effect of metabolic stress on increasing inflammatory biomarker, it has been shown that increased homocysteine may be due to increased creatine breakdown to provide ATP, although increased IL-6 may also be affected by increased CRP (3). Following these changes, an increase in TNF-α can also interfere with the entry of glucose into the muscle cell, which is one of the causes of fatigue and increased metabolic stress, followed by increased inflammation (29).

An important link has been found between muscle contraction activity and immune changes, and the notion that exercise stimulates the acute increase in cytokines has been demonstrated (16). The IL-6 is produced in the same way in type I and II fibres, while stated that in the 2-hour exercise, IL-6 is produced prominently in type II fibers (30). The combination of muscle fibres is not only one of the main factors in determining the IL-6 response to exercise, but also in determining the amount of mechanical efficiency during fatigue contractions (30). Therefore, one of the reasons for the observed changes in the present study could be the percentage of the use of muscle fibres. Although this point has not been investigated in the present study, the recall of type 2 fibres in resistance training is possible.

IL-6, which plays a metabolic and key role in inflammatory conditions, increases in sports activities more than other cytokines. The metabolic and physiological effects of muscle contraction on cytokine changes are not fully understood, but research has shown that exercise produces IL-6 from a muscle that can have metabolic effects on tissues and other organs (26). Note that the source of their secretion is also very important when measuring inflammatory factors in plasma (31). This means that the substrate involved in the activity can be one of the reasons for the difference in acute inflammatory responses to different types of exercise

Besides, eccentric contractions of resistance training with or without BFR or running on a slope without the use of BFR can play a role in increasing homocysteine and CD54 (ICAM-1) (3, 32, 33). The ICAM-1 (CD54) has been reported to be affected by physiological stress such as physical activity, and it is associated with the role of sympathetic nerve activity and its effect on immune function and inflammation (34). Therefore, the acute responses of changes in adhesive molecules such as ICAM are likely to be more important than their chronic responses. Because one year of resistance training, despite the improvement in inflammatory levels, did not significantly improve the adhesive molecules response (1, 35). Also, even 16 weeks of endurance, resistance, or combined training does not affect resting inflammatory markers but has improved the physiological functions (29).

5.1. Conclusions

The significant inflammatory effects of LIRT+BFR have been reported, which has been confirmed by the findings of the present study. However, due to the methodological considerations, it is still very difficult to draw definitive conclusions about the effect of blood flow restriction. Methods of performing BFR training are also very important, especially in clinical settings. Short-term hypoxia created in BFR training, such as systemic hypoxia, can impair some functions, and this should be controlled for long-term training. Besides, blood pressure monitoring and the extent of damage to peripheral arteries, especially in individuals with risk factors, are important. Based on the principles of adaptability and gradual overload, it is better not to use a sudden increase in intensity. It is necessary to perform special considerations before prescribing BFRtraining. Due to the acute increase in inflammatory responses, appropriate recovery is recommended. Because of the low acute inflammatory response, LIRT+BFR have a similar positive effect as HIRT and can be used in rehabilitation training. Groups interested in resistance training or physiotherapists who use Katsu training in the rehabilitation program should review the results of these studies. Future studies, however, would do well to explore this issue using more comprehensive study groups.

Footnotes

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