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EFFECT OF EXERCISE ON SERUM IRON, BLOOD HAEMOGLOBIN AND CARDIAC EFFICIENCY.

Byline: Sunita Choudhary, Rajnee and Bijendra Kumar Binawara

ABSTRACT

Objective: The aim of present study was to assess the impact of exercise in trained and untrained exercise performers on serum iron, blood haemoglobin and cardiac efficiency through quantified exercise on Harvard Steps.

Methodology: The present study was carried out on 13 male medical students and compared it with male athletes in the age group of 18 to 25 years at Dr. Sampurnanand Medical College, Jodhpur The biochemical parameter was serum iron and hemodvnamic parameters measured were hemoglobin, pulse rate and blood pressure in both the groups after overnight rest and after quantified bout of exercise for minutes on Harvard step.

Result: Serum iron fell from pre-exercise level and was more marked (P(less than)O.O1) in untrained. After exercise there was significant rise (P(less than)O.OO1) of hemoglobin and pulse rate in untrained (P(less than)O.OO1). A significant increase in systolic blood pressure in case of untrained boys (p(less than)O.Ol) and athletes (p(less than)O.OO]) was observed. Whereas decrease in diastolic blood pressure was observed in both the groups but decrease diastolic blood pressure were more marked in athletes (P(less than)O.OO1).

Conclusion: Exercise induces improvement in hemodynamic status.

INTRODUCTION

Man's ability to perform exercise is normally limited by the capacity of cardiovascular system to increase the transport of oxygen to active muscles. This increase is governed by complex changes in blood vascular, respiratory system and nervous system1. Response to exercise involves short term adjustments to bout of exercise which differs both in quantity and quality in trained and untrained individuals In order to achieve favourable changes in blood biochemistry through regular exercises, loading elements such as severity and frequency of exercise should be well- defined2. It is evident that biochemical values vary during and after intensive exercise depending on training status, gender, age, nutrition and life quality of the individual as well as environmental factors.

The response of the cardiovascular system to standardized exercise is single and best test for assessing the efficiency of heart. This test is known as "Cardiac Efficiency Test" or "Stress Testing" or "Exercise Tolerance Test" for which several versions are available ranging from Harvard Test to Tread Mill Test. Alterations in heart rate, blood pressure etc. with exercise is known to be dependent upon hematological status and is affected by conditioning to exercise. The fact that, compared to a trained person, there is a greater variation in these in untrained individual during exercise and these values take longer time to return to basal levels forms the basis of Exercise Tolerance Test.

The present study was undertaken to investigate status in hemoglobin, serum iron and its impact if any on cardiac efficiency in normal, healthy adult trained and untrained exercise performers.

METHODOLOGY

The study was carried in department of Physiology of Dr. Sampurnanand Medical College Jodhpur within duration of three months. We selected 23 healthy male subjects between 18 to 25 years. Prior to starting this work we had obtained approval from ethical and research board of Dr. Sampurnanand Medical College Jodhpur. The subjects were divided as 10 trained and 13 untrained exercise performers. The untrained subjects (control group) were students of Dr. SN Medical College, Jodhpur and trained subjects (athletes) from Barkatullah Khan Stadium, Jodhpur. Blood specimens were collected in EDTA vial at 8.30 to 10 a.m. to overcome diurnal variation. All subjects were healthy, taking no medication.

Twenty three subjects under study were divided into two groups.

Group-I: 13 male medical students (control group) constituted the untrained group.

Group-II: 10 male athletes (experimental group) participating in city/district/state competition.

The subjects were asked to perform a mild exercise on modified Harvard Steps at the rate of 15 steps per minutes for 5 minutes. Immediately after exercise, blood sample was taken and investigated. The biochemical parameter included was serum iron by Peter's and Giovanniello method(using bathophenanthroline) by prepared chemicals.5 Whereas hemodynamic parameters measured were hemoglobin by Sahli's method, Radial pulse was examined by compressing the radial artery against the radius and blood pressure by mercury sphygmomanometer. All these parameters were measured:

I. Before exercise

II. After exercise

The data obtained were analyzed for statistical evaluation by Student's t-test to determine the significance of (p(less than)O.O5) value.

RESULTS

In this study, mean age of male untrained was 20.92+2.21 and of male athletes was 21.5+-1.84. Table 1 shows comparison of Hemoglobin between thirteen untrained and ten athletes (male), indicating a highly significant increase (P(less than)0.OO1) in the level of hemoglobin was observed in untrained after exercise as compared to athletes.

Table 2 shows that athletes did not show any significant change in level of serum iron. Whereas, after exercise a significant (P(less than)0.01) decrease in the level of serum iron was observed in untrained boys.

Table 3 shows a highly significant (PczO.0O1) increase in the pulse rate in both groups after exercise.

As shown in Table 4 a highly significant increase in systolic blood pressure in both the groups was observed. Whereas decrease diastolic blood pressure was observed in both the groups but decrease in diastolic blood pressure were more marked in athletes (P(less than)0.001).

Table 1: Comparison of Hemoglobin between male untrained and athletes

Groups###Before exercise###After exercise###P-value

Untrained (N=13)###13.83+-1.23###15.75+-1.20###(less than) 0.001

Athletes (N=10)###14.08+-1.39###14.66+-1.58###(greater than)0.05

P(less than)0.001

Tabl e 2: Comparison of serum iron between male untrained and athletes

Groups###Before exercise###After exercise###P-value

Untrained (N=13)###162.04+-10.96###143.32+- 24.34###(less than)0.01

Athletes (N=10)###135.36+-20.20###121.02+- 18.69###(greater than)0.05

P(less than)0.01

Table 3: Comparison of pulse rate between male untrained and athletes

Groups###Before exercise###After exercise###P-value

Untrained (N=13)###81.38+-9.57###132.62+-22.49###(less than) 0.01

Athletes (N=10)###80.1+-6.01###115+-11.59###(less than)0.001

P(less than)0.001

Table 4: Comparison of blood pressure between male untrained and athletes

Groups###BP###Before exercise###After exercise###P-value

Untrained (N=13)###SBP###122.15+-10.72###138.46+-17.69###(less than)0.01

###DBP###80.77+-13.48###69.38+-10.72###(less than)0.05

Athletes (N=10)###SBP###129.4+-9.62###144.3+-6.43###(less than)0.001

###DBP###84.4+-8.63###67.1+-7.28###(less than)0.001

DISCUSSION

A rise in hemoglobin level was exhibited consequent to exercise in untrained boys. This rise was more marked in untrained boys in comparison to trained indicating already baseline level of hemoglobin in trained individuals this result consents with findings of (Schumacher et al 2002)6. Rise in hemoglobin level in untrained could possibly be on account of flushing action on hemoglobin stores of augmented hemodynamic states. Spleen can expel 110-258 ml of blood into circulation; the blood in spleen is more concentrated and contains as much as 40% more RBC than normal blood. It may be concluded that in untrained individual blood remains more stored conditions and are diverted to circulation in the hour of need. While in trained one stored blood is less in quantity as per our results obtained1.

The impact of exercise is manifested terms of fall in serum iron level in untrained boys. It indicates that the iron stores through serum iron are diverted to hemoglobin synthesis and since untrained there is sudden challenge of RBC demand, extent of diversion is more marked. Which is manifested in terms of fall in serum iron consequent to exercise but in trained extent of diversion becomes less due to consistent temporal diversion but in either case aim is achieved to develop the capacity of meeting the challenge of heightened demand of 02 through hemoglobin.7'8 Many mechanisms have been proposed to explain the relationship between exercise and iron status. These include hemodilulation9, foot strike hemolysis, iron losses in feces, urine, sweat, decrease iron absorption, a shift in red-cell catabolism from the reticuloendothelial system to the hepatocytes, and increased skeleton myoglobin.

Athletes may ingest less than adequate amounts of highly available iron because of extreme emphasis on carbohydrate intake. The body's response loss of iron with exercise may be related to an increased demand for iron containing compound".

The rise in heart rate, one of the mechanisms to increase cardiac output was similar in trained and untrained subjects who were subjected to tailored quantified exercise load on Harvard steps. The trained athletes have accelerated heart rate recovery after exercise. Since the autonomic nervous system is interlinked with many other physiological systems, the responsiveness of the autonomic nervous system in maintaining homeostasis may provide useful information about the functional adaptations of the body.

Rise in systolic blood pressure was more marked in untrained in comparison to trained while diastolic blood pressure decreased more from pre- exercise level in trained/athletes in comparison to untrained exercise performers. It indicates that increase demand of circulation was achieved through increase in stroke volume, our finding's 13-17 supported by many scientist s.

The present study indicates the importance of regular exercise in improving sustained capacity to supply oxygen to the tissues at raised level on demand and by increasing cardiac output, by diverting iron stores towards synthesis of hemoglobin and possibly other iron containing pigment involved in oxygen carrying biological oxidation.

CONCLUSION

It can be concluded that in untrained group, exercise induced changes are much more evident as compared to trained. Exercise leads to improvement in hemodynamic status. Blood from stored sites is diverted in circulation due to increase in sympathetic activity in response to exercise. Body iron is diverted to increase iron containing pigment synthesis or depletion may caused by raised iron excretion. Further studies ultra structural levels and functional level could reveal the mechanism involved in the process of adaptation to increase demand.

Grant Support, Financial Disclosure and Conflict of Interest

None Declared

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CONTRIBUTORS

SC, R and BKB contributed equally to the research and preparation of the manuscript. All authors listed contributed significantly to the research that resulted in the submitted manuscript.

Department of Physiology, Sardar Patel Medical College, Bikaner Raj. - India Address for Correspondence: Dr. Sunita Choudhary, Senior demonstrator, Department of Physiology, Sardar Patel Medical College, Bikaner Raj. - India, E-mail: choudharysunita55@yahoo.com Date Received: April 28, 2011, Date Revised: October 11, 2011, Date Accepted: November 10, 2011

(This article may be cited as: Choudhary S, Rajnee, Binawara BK. Effect of Exercise on Serum Iron, Blood Haemoglobin and Cardiac Efficiency. J Postgrad Med Inst 2012; 26(1): 13-6.)
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Article Details
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Author:Choudhary, Sunita; Binawara, Rajnee; Binawara, Bijendra Kumar
Publication:Journal of Postgraduate Medical Institute
Article Type:Report
Geographic Code:9PAKI
Date:Mar 31, 2012
Words:2185
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