J. Phys. Ther. Sci.
27: 51–56, 2015
Original Article
Effects of aerobic exercise intensity on 24-h
ambulatory blood pressure in individuals with type
2 diabetes and prehypertension
Pâmella K aroline de morais1)a, marcelo magalhães sales1)a*, Jeeser alves de almeida2)a,
daisy motta-santos3), caio victor de sousa1), herbert gustavo simões1)
1)
Universidade Católica de Brasília: EPTC, QS07, LT1 s/n. Bloco G Sala 15, CEP 72030-170 Águas
Claras, Taguatinga/DF, Brazil
2) Universidade de Brasília, Brazil
3) Universidade Federal de Minas Gerais, Brazil
Abstract. [Purpose] To verify the effects of different intensities of aerobic exercise on 24-hour ambulatory blood
pressure (BP) responses in individuals with type 2 diabetes mellitus (T2D) and prehypertension. [Subjects and
Methods] Ten individuals with T2D and prehypertension (55.8 ± 7.7 years old; blood glucose 133.0 ± 36.7 mg·dL−1
and awake BP 130.6 ± 1.6/ 80.5 ± 1.8 mmHg) completed three randomly assigned experiments: non-exercise control (CON) and exercise at moderate (MOD) and maximal (MAX) intensities. Heart rate (HR), BP, blood lactate
concentrations ([Lac]), oxygen uptake (VO2), and rate of perceived exertion (RPE) were measured at rest, during
the experimental sessions, and during the 60 min recovery period. After this period, ambulatory blood pressure
was monitored for 24 h. [Results] The results indicate that [Lac] (MAX: 6.7±2.0 vs. MOD: 3.8±1.2 mM), RPE
(MAX: 19±1.3 vs. MOD: 11±2.3) and VO2peak (MAX: 20.2±4.1 vs. MOD: 14.0±3.0 mL·kg−1·min−1) were highest
following the MAX session. Compared with CON, only MAX elicited post-exercise BP reduction that lasted for 8 h
after exercise and during sleep. [Conclusion] A single session of aerobic exercise resulted in 24 h BP reductions in
individuals with T2D, especially while sleeping, and this reduction seems to be dependent on the intensity of the
exercise performed.
Key words: Metabolic disease, Systemic arterial hypertension, lactate threshold
(This article was submitted Jun. 4, 2014, and was accepted Jul. 4, 2014)
INTRODUCTION
Type 2 diabetes mellitus (T2D) is a metabolic disorder
characterized by the inability of insulin to properly perform
its function, resulting in chronic hyperglycemia1) and it is
also associated with endothelial dysfunction 2), increase in
sympathetic tone3) and several cardiovascular disorders,
such as systemic arterial hypertension (SAH)4) and coronary artery disease (CAD)5). The increase in the incidence
of T2D is mainly the result of genetic predisposition, dietary excess of foods rich in fat and sugar, obesity, sedentarism and low levels of physical fitness6, 7).
The frequent practice of physical exercise helps to both
prevent and treat T2D and its complications8–10). The benefits of exercise for diabetic individuals include better glycemic control11, 12), reduction of blood pressure (BP)13–15) and
improvement of cardiorespiratory fitness12, 16) all of which,
aThese
authors contributed equally to this work.
*Corresponding author. Marcelo Magalhães Sales (E-mail:
marcelomagalhaessales@gmail.com)
©2015 The Society of Physical Therapy Science. Published by IPEC Inc.
This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-ncnd) License <http://creativecommons.org/licenses/by-nc-nd/3.0/>.
are associated with cardiovascular events and mortality17).
The reduction of BP in the post-exercise (recovery) period
to values below those observed during pre-exercise (rest)
is called post-exercise hypotension (PEH)18). This phenomenon can be observed both in normotensive19) and hypertensive individuals20, 21), and in the latter, a post-exercise BP reduction from 12 h 22, 23) to 24 h 24, 25) has also been observed.
The prescription of an appropriate amount of exercise
is recommended for T2D patients, and it should be based
on intensities that are related to their aerobic and physical
capacities. To accomplish this, it is necessary to perform
incremental tests for the evaluation of functional ability,
such as the anaerobic threshold (AT) and maximum oxygen
uptake (VO2max) tests26–28). These tests are currently used
by studies investigating the prescription of aerobic exercise
for BP control in individuals with T2D14, 15).
However, some studies14, 15) have only analyzed BP for
two hours post-exercise and have not investigated whether
the benefits extend over the following 24 hours, including
sleep. It is known that T2D is associated with endothelial
dysfunction 2), therefore, this pathology could attenuate the
expected benefits of acute aerobic exercise on BP3). Consequently, the objectives of this study were to verify and compare: 1) the effects of a single aerobic exercise session on
24-hour BP responses and 2) the effects of aerobic exercise
52
J. Phys. Ther. Sci. Vol. 27, No. 1, 2015
intensity on 24-hour BP responses of individuals with T2D
and prehypertension.
SUBJECTS AND METHODS
After approval by the local human research ethics committee (CEP of. 013/2008), 10 participants aged between
45 and 70 years old were enrolled (3 men and 7 women;
Table 1) after they signed an informed consent form before
participation in the study. Inclusion criteria were sedentary
life style, a diagnosis of T2D for at least one year, glycemic
control through nutrition and/or medication (e.g. sulfonylureas, metformin, metformin+glibenclamide, glimepiride,
pioglitazone chloridrate), no use of exogenous insulin and
no chronic complications, such as, diabetic foot, nephropathy, retinopathy, neuropathies or cardiovascular diseases.
All participants were recruited from a Public Hospital at
Taguatinga, and all had been previously assessed in standard tests conducted by endocrinologists and cardiologists.
This meant that, at the time of recruitment, all subjects with
a positive history for any of the tests were eliminated from
the study.
After anthropometric and resting electrocardiography
(ECG) evaluations and familiarization with the experimental procedures, the volunteers participated in three cardiologist-supervised experimental sessions on different days:
1) maximal exercise (MAX); 2) moderate exercise (MOD);
and 3) a control session (CON) with no exercise. Sessions
2 and 3 were performed on alternate days in a randomized
order at the same time of day (between 8:30 and 9:00 h),
with a 48-hour interval between sessions. Two hours before
the sessions the participants ate a standardized breakfast of
315 kcal, containing 66% (51.6 g) carbohydrates, 6% (4.6 g)
of protein and 27% (9.5 g) of fat.
Before sessions the participants remained at rest for 20
minutes for BP (Dyna-MAPA − Cardios®) and HR (Polar® S810i) measurements, while capillary blood samples
were collected for [Lac] determination (YSI 2700 − Yellow
Springs − USA). During the post-experimental period, the
participants remained seated for a period of 60 minutes,
while the measurements of BP and HR, and blood sample
collections were taken every 15 minutes. After that, the
participants were allowed 20 minutes for personal hygiene
before the placement of an ambulatory blood pressure
monitor (Dyna-MAPA − Cardios®), which measured their
BP for the 24 hours subsequent to their exercise or control
sessions. Ambulatory blood pressure monitor (ABPM) was
carried out every 30 min after the sessions until 2300 h, after that time, hourly, until 0700 h, as per the IV Guidelines
For Ambulatory Blood Pressure Monitoring28). ABPM data
were considered in the analysis when ≥90% of the measurements were valid. Participants were instructed to perform
their habitual daily activities and to keep the non-dominant
upper limb (where the measuring cuff was placed) in a relaxed position while the BP was being measured 28).
MAX consisted of a graded cardiopulmonary exercise
stress test (Lode Excalibur Sports, Netherlands). VO2peak
was determined by breath-by-breath analysis of expiratory
gases during exercise as previously described 29). The gas
analyzer was calibrated with a 3-L syringe (flow calibra-
Table 1. Anthropometric characteristics and parameters
of aerobic fitness during incremental load test
performed by individuals with T2D (n=10)
Age (years)
Weight (kg)
Height (cm)
BMI (kg·m−2)
Abdominal circumference (cm)
BodyFat (%)
Time with DM (years)
FG (mg·dL−1)
Awake SBP (mmHg)
Awake DBP (mmHg)
HRmax (bpm)
Pmax (Watts)
[Lac] max (mM)
VO2peak (ml·kg−1.min−1)
LT (watts)
[Lac] LT (mM)
VO2 at LT (ml·kg−1·min−1)
55.8 ± 7.7
79.4 ± 14.0
160.7 ± 11.3
30.7 ± 4.2
102.1 ± 13.7
29.2 ± 9.9
6.3 ± 3.1
133.0 ± 36.7
130.6 ± 1.6
80.5 ± 1.8
150.3 ± 23.5
85.5 ± 22.4
6.7 ± 2.0
20.2 ± 4.1
49.5 ± 23.5
3.2 ± 0.9
14.6 ± 3.7
BMI: body mass index; FG: fasting glycemia; SBP:
systolic blood pressure; DBP: diastolic blood pressure;
VO2peak: peak consumption of oxygen; Pmax: the highest power output (WATTS) obtained in the incremental
test on a cycle ergometer; HRMax: maximum heart rate;
[Lac]: blood lactate concentration; LT: lactate threshold
tion) and a standard mixture of gas containing 4.9% CO2
and 17% O2 (gas calibration). An incremental load test was
initiated with one minute of warm-up at a zero Watt (W)
load, followed by increments of 15 W every 3 minutes,
consisting of continuous cycling at a constant cadence (60
revolutions per minute) until voluntary exhaustion of the
participant. At rest and during the final 10 sec of each stage
of the MAX, blood samples were collected for blood lactate analysis ([Lac]) using a YSI 2700 biochemistry analyzer (YSI Inc, Yellow Springs, OH, USA). In addition, BP
was measured by the auscultatory method, using a mercury
column sphygmomanometer (Tycos Instrumentos Hospitalares, São Paulo, Brazil). Heart rate (HR) was monitored
using a Polar® S810i heart-rate monitor (Polar Electro Oy,
Kempele, Finland), rate of perceived exertion (RPE) was
rated on the 20-point Borg scale30), and ventilatory variables were also recorded (MetaLyzer 3B System; Cortex,
Leipzig, Germany). MAX allowed identification of the lactate threshold (LT) and measurement of the VO2peak. The
LT was identified through visual inspection of the lactate
curve; the LT was considered the intensity at which a loss
of linearity and an abrupt and exponential increase in the
lactate curve occurred31, 32).
The MOD session consisted of 20 minutes of cycle ergometer exercise (Lode Excalibur Sports, Netherlands) at
a constant load corresponding to 90% of the LT (90%LT).
The CON was a 20-minute session of seated rest. At 10 and
20 min during MOD and CON, BP, HR, [Lac], RPE and
ventilatory variables were measured.
53
Table 2. Mean (±DP) results of metabolic and hemodynamic parameters, rate of perceived exertion and the duration of sessions
[Lac] (mM)
VO2 (mL·kg−1· min−1)
% VO2peak
Watts
HR (bpm)
SBP (mmHg)
DBP (mmHg)
RPE (score)
Duration (min)
MAX
MOD
CON
6.7 ± 2.0 †
20.2 ± 4.1†
100 ± 0.0 †
85.5 ± 22.4†
150.3 ± 23.5†
197.8 ± 14.0†
89.7 ± 6.2
19 ± 1.3 †
18.7 ± 4.5
3.8 ± 1.2
14.0 ± 3.0
69.4 ± 8.1
44.6 ± 21.2
114.5 ± 25.1
147.0 ± 15.5
84.5 ± 7.2
11 ± 2.3
20.0 ± 0.0
2.5 ± 0.8*
4.2 ± 0.3*
73.2 ± 9.1*
125.2 ± 13.3*
78.8 ± 7.3
20.0 ± 0.0
[Lac]: concentration of blood lactate; Peak VO2: highest value of oxygen consumption;
%VO2 peak: percentage of peak oxygen consumption reached; HR: heart rate; SBP: systolic blood pressure; DBP: diastolic blood pressure; RPE: rate of perceived exertion.
* p≤0.05 in relation to sessions MAX and MOD; † p≤0.05 in relation to MOD
Table 3. Mean results (±SD) of 24-h systolic blood pressure (SBP), diastolic (DBP) and mean arterial pressure (MAP) after the MAX, MOD and CON sessions
Parameters
SBP (mmHg)
DBP (mmHg)
MAP (mmHg)
Resting
24 h
Waking
Sleeping
Resting
24 h
Waking
Sleeping
Resting
24 h
Waking
Sleeping
MAX
132.1± 11.4
124.3 ± 7.4 *
126.6 ± 8.0 *
116.8 ± 9.8 †#
81.6 ± 6.7
76.3 ± 4.5 *†
77.9 ± 5.1 *
70.8 ± 4.7*†#‡
102.6 ± 8.2
95.4 ± 4.6 *†
97.3 ± 5.5 *
89.2 ± 5.2*†#‡
MOD
CON
129.0 ± 10.5
127.7 ± 7.1
129.7 ± 7.1
121.5 ± 12.0
80.3 ± 8.8
78.9 ± 3.7
80.4 ± 3.8
73.6 ± 7.4
101.0 ± 8.4
98.2 ± 3.4
100.2 ± 3.5
91.6 ± 6.9 †
130.8 ± 8.4
132.8 ± 10.6
135.8 ± 10.9
124.6 ± 11.6
79.7 ± 10.1
82.2 ± 5.0
83.9 ± 5.2
77.1 ± 5.4
101.3 ± 9.3
102.5 ± 6.9
104.8 ± 7.4
95.8 ± 6.3
*p<0.05 in relation to control session; †p<0.05 in relation to pre-exercise rest of the same session; # in relation to waking period of the same session; ‡ in relation to 24 h of the same session
Statistical analyses
Data are presented as mean (±) standard deviation and
as absolute variations (delta absolute), as indicated for each
analysis. After assessing the normality and homogeneity of
the data using the Shapiro-Wilk test and Levene’s test, respectively, between- and within-groups comparisons were
performed using Split-Plot ANOVA (Mixed ANOVA) with
Scheffe’s post hoc test. When any of the dependent variables did not show sphericity in the Mauchly’s test, the epsilon of Greenhouse-Geisser was used to analyze the F statistic. The level of significance was chosen as 5% (p≤0.05) and
all analyses were carried out using the Statistical Package
for the Social Sciences (SPSS) 15.0.
RESULTS
The subjects were 10 persons, 3 men and 7 women with
T2D, according to the fasting glycemia1), and prehypertension33). The participants were overweight to obese34) and had
low physical fitness35) (Table 1). The aerobic fitness, metabolic and hemodynamic parameters obtained during all the
sessions (MAX, MOD and CON) are presented in Tables
1 and 2. No subject exhibited a hypertensive response, defined as SBP ≥210 mmHg and DBP ≥ 105 mmHg36), to the
graded exercise test.
Table 3 presents the mean values of SBP, DBP and MAP
at rest and during ambulatory measurement of blood pressure (ABPM) after the experimental sessions and control.
The post-MAX exercise SBP, DBP and MAP over 24 h,
in the waking and sleeping (DBP and MAP) period were
significantly different from the respective values obtained
after the CON session (p<0.05).
Regarding the absolute changes (delta) of SBP, DBP and
MAP during the 24 hours after the experimental sessions.
A reduction in SBP was observed in the periods 0–2 h (−4.8
mmHg), 4–6 h (−7.6 mmHg), 6–8 h (−11.6 mmHg) postMAX compared to CON (0–2 h: +5.6; 4–6 h: +6.3; 6–8 h:
+9.1; 20–22: −1.4 mmHg), and in the period 20–22 h (−16.1
54
J. Phys. Ther. Sci. Vol. 27, No. 1, 2015
mmHg) compared to the CON (−1.4 mmHg) and MOD
(−2.1 mmHg) (p<0.05). Furthermore, a reduction in SBP
occurred between 16–22 h (16–18 h: −19.7 mmHg; 18–20 h:
−17.6 mmHg; 20–22 h: −16.1 mmHg) after MAX compared
to pre-exercise rest (p<0.05).
Significant reductions in DBP were observed from 0–2
h (−1.9 mmHg), 6–8 h (−5.8 mmHg), and 18–22 h (18–20 h:
12.2 mmHg; 20–22 h: −7.5 mmHg) post-MAX compared to
CON (0–2 h: +7.6; and 6–8 h: +5.0; 18–20 h: −3.7; 20–22 h:
+2.4 mmHg) (p<0.05). A nocturnal reduction in DBP between 16 and 20 h (16–18: −14.5; 18–20 h: −12.2 mmHg)
was observed only after MAX (p<0.05).
Similarly the MAP, significant reductions were observed
post-MAX when compared to CON in the periods 0–2 h
(MAX: −3.9 vs. CON: +6.6 mmHg), 6–8 h (MAX: −7.9 vs.
CON: +4.6 mmHg), and 18–22 h [MAX (18–20 h): −17.1
vs. CON: −7.0 mmHg; MAX (20–22 h): −10.4 vs. CON:
+0.5 mmHg]. Between 14 and 22 h (14–16 h: −11.2; 16–18
h: −16.4; 18–20 h: −17.1; 20–22 h: −10.4 mmHg) there was
a post-MAX reduction in MAP, as well as between 16 and
20 h (16–18 h: 12.1; 18–20 h: −11.0 mmHg) post-MOD compared to pre-exercise values (p<0.05).
No significant differences were found for SBP, DBP and
MAP after the MOD session compared to after the MAX
and CON sessions during the 24 h ABPM (p>0.05).
DISCUSSION
The present study investigated the effects of different exercise intensities on 24 hour BP responses in patients with
T2D and prehypertension. The results reveal that, when
compared to the day in which no exercise was performed
(CON), the MAX session elicited a reduction in SBP, DBP
and MAP over a 24 h period. Furthermore, the MAX session produced a significant reduction in pressure variation
during sleep compared to the CON session, and also for
SBP when compared to the MOD session (Table 3).
The majority of studies have investigated the effects of
different exercise intensities on 24-hour BP responses in
healthy and hypertensive subjects21, 24). Little research of
this type has investigated individuals with T2D15, 16), and
when it has, the authors only analyzed BP for 2 h post-exercise. Therefore, little is known about the effects of different exercise intensities on non-pharmacologic control of
24 h BP in T2D individuals. In the present study, both the
MAX and MOD sessions elicited significant BP reductions,
suggesting that about 20 minutes of exercise has significant
benefits. The results also suggest that the intensity of the
exercise and the physiological stress generated play important roles in lowering the blood pressure of individuals with
T2D.
Evidence has been presented that exercise intensity influences the BP response of diabetic and hypertensive individuals14, 21). However, Pescatello et al.22) investigated the
effects of exercise intensity (40 and 70% VO2max) on the
BP response of normotensive and hypertensive individuals, and found that intensity did not affect post-exercise BP
reduction, which lasted for 12 hours regardless of the intensity, but only in the hypertensive group. Nevertheless, it
is possible that the studied intensities (40 and 70% of VOboth within in the same intensity domain (moderatebelow the LT), masked the effect of exercise intensity.
Eicher et al.24) conducted three experimental sessions of
low intensity exercise (40% of VO2peak), moderate intensity exercise (60% of VO2peak) and vigorous intensity exercise (100% of VO2peak), with 45 hypertensive men. They
reported that PEH was proporcionate to the level of effort in
the exercise sessions: the vigorous session caused the greatest reductions in SBP (−1.0 ± 1.7 mmHg) and DBP (−6.3 ±
1.2 mmHg) compared to the control session (10.7 ± 1.3 and
−1.4 ± 0.9 mmHg). They also reported that for each 10%
increase in VO2peak there was a 1.5 mmHg and 0.6 mmHg
decrease for SBP and DBP, respectively.
One of the main features of the present study was that
T2D patient results were recorded for 24 hours, and that,
compared to CON, a greater reduction in SBP occurred during the post-MAX sleeping period than during post-MOD.
This is important for individuals with T2D, considering that
elevated BP values during the day associated with a low
nocturnal decrease (less than 10%) are factors that, in association with hyperglycemia, increase the risk of cardiovascular dysfunction. Jones et al.37) studied 6 normotensive
individuals who performed aerobic exercises at 40% and
70% VO2max in the morning, and observed a MAP reduction only during sleep after 70% VO2max exercise, which
suggests that the exercise intensity could have been responsible for this result.
The difference in exercise intensity in this study (MAX
and MOD) can be confirmed by the different levels of metabolic, hemodynamic, and cardiorespiratory stress, and by
the perceptual responses collected during the experimental
sessions. Significant differences were observed in the responses to MAX, with higher values of VO2peak, SBP and
HR during the session (Table 1). At the end of MOD, the
RPE was 11 and [Lac] was 3.8 mM, whereas at the end of
MAX the RPE reached 19, and [Lac] was 6.7 mM, which
shows that MAX was performed at a higher intensity than
MOD. According to MacDonald et al.43), the hemodynamic
stress and metabolite accumulations induced by exercise
are among the main factors responsible for muscle vasodilatation, and consequently for the decrease in peripheral
vascular resistance during and after exercise.
Piepoli et al.38) conducted three experimental sessions of
maximal incremental exercise with 25 W increments every
5 min, moderate exercise with 5 stages at the 12–15 W load,
and constant minimal exercise at 50 W of the same duration as the maximal exercise, and a control session with 8
healthy individuals. After exercising, the participants remained for 60 minutes at the facility for BP, peripheral vascular resistance and forearm vascular resistance analysis.
Piepoli et al.38) concluded that, compared to the moderate,
minimal and control sessions, only maximal exercise was
effective at reducing DBP. This finding was probably due
to decreases in peripheral vascular resistance and forearm
vascular resistance, which remained lower for 1 h only after
maximal exercise. Piepoli et al.39) also reported that, after
ten healthy individuals performed a maximal exercise session, their DBP was reduced for one hour, probably because
2max),
55
of a decrease in peripheral vascular resistance (as cited
above), even though there was an increase in renin activity,
persistent sympathetic activity and reduced vagal tone, possibly due to peripheral vasodilatation.
Neural and humoral factors also influence BP levels.
Reductions in cardiac output and decreases in peripheral
vascular resistance are associated with the occurrence of
PEH40, 41). Two mechanisms have been proposed for explaining the post exercise decrease of peripheral resistance:
sympathetic inhibition, and alterations in vascular responsiveness. The activation of the neurokinin-1 receptor during exercise triggers the receptor to undergo internalization
after the completion of exercise, dampening the GABA interneuron’s solitary tract nucleus, and modifying the baroreflex to a lower level after exercise, by reducing transmission to baroreceptor second-order neurons, increasing the
excitement of the ventral caudal lateral medulla, increasing
inhibition of the rostral ventral lateral medulla, inhibiting
its action, and decreasing sympathetic nervous activity,
leading to post-exercise hypotension. On the other hand, a
greater local release of nitric oxide, prostaglandins, adenosines, and ATP may also alter the vascular response and
contribute to BP reduction42).
T2D patients can present endothelial dysfunction 2) and
reduced release of vasodilator substances, which suggests
that a possible mechanism for the decrease of vascular resistance is damaged in this population, as observed in the
post-MOD response. Nevertheless, after MAX this limitation would be less evident, as was demonstrated in the present study of T2D patients. Perhaps exercise performed at
higher intensities allows greater recruitment of motor units
and, consequently, induces greater metabolic and hemodynamic stress, as well as promoting greater BP decrease in
the post-exercise period.
The American College of Sports Medicine9) recommends moderate intensity exercise for individuals with
T2D, but higher intensity exercise may have additional
benefits for cardiorespiratory fitness and glucose control44).
Maximal exercise is a very well known and useful method
for verifying exercise response. Thus, its use is important
for determining the response of special populations such
as T2D patients, considering that these individuals tend
to present more cardiovascular problems5). Nevertheless,
it is important to point out that the use of high intensity
exercise with T2D patients should be well supervised, and
performed only by individuals whose BP and T2D are controlled and who have no associated complications such as
cardiovascular dysfunction, and should be used only after
having proven the patient’s physical and cardiorespiratory
fitness in clinical examinations.
Finally, we conclude that a single aerobic exercise session resulted in BP reduction for 24 h in individuals with
T2D, particularly while sleeping, and the magnitude of this
reduction seems to be dependent on the intensity at which
the exercise is performed.
arships for undergraduate (CNPq), masters (CAPES) and
PhD students (CAPES and CNPq), as well as for the research productivity scholarships (CNPq) and materials for
this research (CAPES/PROCAD and CNPq).
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