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1.
J Strength Cond Res ; 33(2): 399-407, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28658080

RESUMO

Paulo, AC, Tricoli, V, Queiroz, ACC, Laurentino, G, and Forjaz, CLM. Blood pressure response during resistance training of different work-to-rest ratio. J Strength Cond Res 33(2): 399-407, 2019-Changes in the work-to-rest ratio (W:R) of resistance training protocols (RTPs) (i.e., decreasing work or increasing rest) reduce the marked elevation in blood pressure (BP) that occurs during RTP execution. However, whether changes in RTP structure without changing W:R can change BP responses to RTP is unknown. To investigate the effect of different structures of rest intervals and number of repetitions per set on BP response among RTP equated and nonequated for W:R, 20 normotensive participants (25 ± 4 years) performed 4 different RTP of the leg extension exercise with the same work but different W:R structures. Two protocols followed the recommendations for cardiovascular disorders: (a) HIGHW:R-3×15:44s-3×15:44s (set×reps:rest between sets), which has high W:R (45reps:88s) and (b) LOWW:R-3×15:88s-3×15:88s, which has low W:R (45reps:176s). The other 2 protocols were W:R-equated to LOWW:R (45reps:176s): (c) LOWW:R-9×5:22s and (d) LOWW:R-45×1:4s. Systolic BP (ΔSBP) and diastolic BP (ΔDBP) were assessed by finger photoplethysmography. There were significant main effects for ΔSBP after RTP (p ≤ 0.05): HIGHW:R-3×15:44s = LOWW:R-3×15:88s > LOWW:R-45×1:4s > LOWW:R-9×5:22s (+87 ± 5 and +84 ± 5 vs. +61 ± 4 vs. 57 ± 4 mm Hg). For ΔDBP, there was a significant interaction between RTP and moment (p ≤ 0.05). Thus, HIGHW:R-3×15:44 > LOWW:R-3×15:88s > LOWW:R-45×1:4s > LOWW:R-9×5:22s (+53 ± 5 vs. +49 ± 5 vs. +44 ± 4 vs. +38 ± 3 mm Hg). HIGHW:R-3×15:44s produced the highest increase in ΔDBP, and LOWW:R-9×5:22s produced the lowest increase in ΔSBP and ΔDBP. Our findings may help the development of RTP protocols that may mitigate pressure peaks without changing important exercise variables (i.e., volume or duration).


Assuntos
Pressão Sanguínea/fisiologia , Doenças Cardiovasculares/fisiopatologia , Treinamento de Resistência/métodos , Descanso/fisiologia , Adulto , Exercício/fisiologia , Feminino , Humanos , Masculino , Adulto Jovem
2.
J Strength Cond Res ; 27(3): 786-92, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-22643144

RESUMO

Hypertension is highly prevalent among African individuals and descendants, and in this ethnic group, asleep blood pressure is strongly associated with target organ damage. After its execution, a single bout of resistance exercise may decrease blood pressure in white individuals, but its effects are unknown in Africans. This study investigated the effects of a bout of resistance exercise, conducted in accordance with the 2007 American Heart Association (AHA) guidelines, on postexercise blood pressure in African subjects. Twenty-four Mozambican men (40 ± 2 years) underwent, in a random order, 2 experimental sessions: control (sitting resting) and exercise [8 resistance exercises, 1 set, 10-15 repetitions, 30-40% of 1 repetition maximum (1RM) for upper-body muscles and 50-60% of 1RM for lower-body muscles]. Before and after the interventions, clinic blood pressure was measured. Ambulatory blood pressure was also evaluated after both sessions. Clinic systolic blood pressure did not change after both interventions, whereas diastolic blood pressure increased significantly and similarly after the control and the exercise sessions. Twenty-four-hour (127 ± 3 mm Hg vs. 130 ± 3 mm Hg and 78 ± 2 mm Hg vs. 81 ± 2 mm Hg, respectively, p < 0.05) and asleep (119 ± 4 mm Hg vs. 123 ± 4 mm Hg and 69 ± 3 mm Hg vs. 72 ± 3 mm Hg, respectively, p < 0.05) systolic and diastolic blood pressures were lower after the exercise than in the control session. These results show that in African men, a single bout of resistance exercise, conducted in accordance with 2007 AHA guidelines, decreased 24-hour and asleep blood pressures. These reductions might represent an important benefit for African individuals and descendants among whom target organ damage is mainly associated with ambulatory blood pressure levels.


Assuntos
Grupo com Ancestrais do Continente Africano , Pressão Sanguínea/fisiologia , Treinamento de Resistência , Sono/fisiologia , Adulto , Frequência Cardíaca/fisiologia , Humanos , Masculino , Pessoa de Meia-Idade , Moçambique , Guias de Prática Clínica como Assunto
3.
Br J Clin Pharmacol ; 70(5): 664-73, 2010 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-21039760

RESUMO

AIMS: This study was conducted to determine whether atenolol was able to decrease BP level and mitigate BP increase during dynamic resistance exercise performed at three different intensities in hypertensives. METHODS: Ten essential hypertensives (systolic/diastolic BP between 140/90 and 160/105mmHg) were blindly studied after 6 weeks of placebo and atenolol. In each phase, volunteers executed, in a random order, three protocols of knee-extension exercises to fatigue: (i) one set at 100% of 1RM; (ii) three sets at 80% of 1RM; and (iii) three sets at 40% of 1RM. Intra-arterial radial blood pressure was measured throughout the protocols. RESULTS: Atenolol decreased systolic BP maximum values achieved during the three exercise protocols (100% = 186 ± 4 vs. 215 ± 7, 80% = 224 ± 7 vs. 247 ± 9 and 40% = 223 ± 7 vs. 252 ± 16mmHg, P < 0.05). Atenolol also mitigated an increase in systolic BP in the first set of exercises (100% =+38 ± 5 vs.+54 ± 9; 80% =+68 ± 11 vs. +84 ± 13 and 40% =+69 ± 7 vs.+84 ± 14, mmHg, P < 0.05). Atenolol decreased diastolic BP values and mitigated its increase during exercise performed at 100% of 1RM (126 ± 6 vs. 145 ± 6 and +41 ± 6 vs.+52 ± 6, mmHg, P < 0.05), but not at the other exercise intensities. CONCLUSIONS: Atenolol was effective in both reducing systolic BP maximum values and mitigating BP increase during resistance exercise performed at different intensities in hypertensive subjects.


Assuntos
Anti-Hipertensivos/uso terapêutico , Atenolol/uso terapêutico , Pressão Sanguínea/efeitos dos fármacos , Exercício/fisiologia , Hipertensão/tratamento farmacológico , Adulto , Anti-Hipertensivos/farmacologia , Atenolol/farmacologia , Pressão Sanguínea/fisiologia , Feminino , Humanos , Hipertensão/fisiopatologia , Masculino , Pessoa de Meia-Idade , Treinamento de Resistência/métodos
4.
J Strength Cond Res ; 23(2): 571-8, 2009 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-19209079

RESUMO

This study investigated clinic and ambulatory blood pressure (BP) responses after a single bout of low-intensity resistance exercise in normotensive subjects. Fifteen healthy subjects underwent 2 experimental sessions: control-40 minutes of seated rest, and exercise-6 resistance exercises, with 3 sets of as many repetitions as possible until moderate fatigue, with an intensity of 50% of 1-repetition maximum (1RM). Before and for 60 minutes after interventions, clinic BP was measured by auscultatory and oscillometric methods. Postintervention ambulatory BP levels were also measured for 24 hours. In comparison with preintervention values, clinic systolic BP, as measured by the auscultatory method, did not change in the control group, but it decreased after exercise (-3.7 +/- 1.6 mm Hg, p < 0.05). Diastolic and mean BP levels increased after intervention in the control group (+3.4 +/- 1.0 and +3.0 +/- 0.8 mm Hg, respectively, p < 0.05) and decreased in the exercise group (-3.6 +/- 1.7 and -3.4 +/- 1.4 mm Hg, respectively, p < 0.05). Systolic and mean oscillometric BP levels did not change after interventions either in the control or exercise sessions, whereas diastolic BP increased after intervention in the control group (+5.0 +/- 1.7 mm Hg, p < 0.05) but not change after exercise. Ambulatory BP behaviors after interventions were similar in the control and exercise sessions. Significant and positive correlations were observed between preexercise values and postexercise clinic and ambulatory BP decreases. In conclusion, in the whole sample, a single bout of low-intensity resistance exercise decreased postexercise BP under clinic, but not ambulatory, conditions. However, considering individual responses, postexercise clinic and ambulatory hypotensive effects were greater in subjects with higher preexercise BP levels.


Assuntos
Monitorização Ambulatorial da Pressão Arterial , Pressão Sanguínea , Treinamento de Resistência , Adolescente , Adulto , Determinação da Pressão Arterial/métodos , Feminino , Humanos , Masculino , Adulto Jovem
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