Reduction of Blood Pressure Response During Strength Training Through Intermittent Muscle Relaxations

Abstract

The increase in blood pressure during training is a disadvantage of strength training in the elderly. To reduce this effect it is generally recommended to apply lower levels of relative muscle strength with longer contraction durations or higher number of repetitions (continuous mode (CM), e. g. 50 % of maximal strength, 10 to 15 repetitions without pauses). Alternatively, higher contraction forces could be combined with frequent periods of muscle relaxation and fewer repetitions (intermittent mode (IM), e. g. 80 % of maximal strength, 8 repetitions consisting of 1.5 s concentric contraction, 1.5 s eccentric contraction and 3 s pause). We compared the blood pressure effects of both approaches during leg press exercise in two age groups (10 subjects aged 22 to 42 y, 9 subjects aged 60 to 72 y). Blood pressure was measured continuously by a non-invasive method (FINAPRES^TM, Ohmeda 2300, Englewood USA). Results: 1. The age of the subjects had no significant influence on the slopes of blood pressure increase during the different exercise modes. 2. The frequent insertion of short (3 s) periods of muscle relaxation (IM) decreased the blood pressure response more effectively than a reduction in contraction strength alone (CM). Short muscle relaxations have an immediate, mechanical effect on blood pressure and they allow a metabolic recovery which attenuates the trend of blood pressure increase.

Key words

Elderly - cardiovascular risks - muscle contraction - muscle relaxation

References

• 1 Baum K, Essfeld D, Stegemann J. The influence of muscle interstitial volume on K⁺-induced heart rate drives in rats.  Eur J Appl Physiol. 1988;  57 33 - 38
• 2 Baum K, Leyk D, Essfeld D. Comparison of Finapres^TM and Riva-Rocci blood pressure measurements during constant-load cycle ergometer exercise. In: Rüddel H, Curio J (eds). Continuous non-invasive blood pressure measuring Frankfurt; P. Lang 1991: 85-89
• 3 Baum K, Essfeld D, Sondermann C, Leyk D, Stegemann J. Effect of graded changes in extracellular muscle volume on cardiovascular drives during static exercise.  Eur J Appl Physiol. 1993;  67 245 - 249
• 4 Campbell A J, Borrie M J, Spears G F. Risk factors for falls in a community-based prospective study of people 70 years and older.  J Gerontol. 1989;  44 112 - 117
• 5 Danneskiold-Samsoe B, Kovod V, Munter J, Grimby G, Schnohr P, Jensen G. Muscular strength and functional capacity in 78 - 81-year-old men and women.  J Appl Physiol. 1984;  52 310 - 314
• 6 Dorlas J C, Nijboer J A, Butijn W T, van der Hoeven G M, Settels J J, Wesseling K H. Effects of peripheral vasoconstriction on the blood pressure in the finger, measured continuously by a new noninvasive method (the Finapres).  Anesthesiology. 1985;  62 342 - 345
• 7 Frontera W R, Meredith C N, O`Reilly K P, Knuttgen H G, Evans W J. Strength conditioning in older men: Skeletal muscle hypertrophy and improved function.  J Appl Physiol. 1988;  64 1038 - 1044
• 8 Häkkinen K, Kallinen M, Izquierdo M, Jokelainen K, Lassila H, Mälkia E, Kraemer W J, Newton R U, Alen M. Changes in agonist-antagonist EMG, muscle CSA, and force during strength training in middle-aged and older people.  J Appl Physiol. 1998;  84 1341 - 1349
• 9 Häkkinen K, Newton R U, Gordon S E, McCormick M, Volek J S, Bradley C N, Gotshalk L A, Campbell W W, Evans W J, Häkkinen A, Humphries B J, Kraemer W J. Changes in muscle morphology, electromyographic activity, and force production characteristics during progressive strength training in young and older men.  J Gerontol Biol Sci. 1998;  53A B415 - B423
• 10 Harridge S DR, Kryger A, Stensgaard A. Knee extensor strength, activation, and size in very elderly people following strength training.  Muscle Nerve. 1999;  22 831 - 839
• 11 Jette A M, Branch L G. The Framingham disability study: Physical disability among the ageing.  Am J Public Health. 1981;  71 1211 - 1216
• 12 Jones D A, Rutherford O M. Human muscle strength training: The effects of three different regimes and the nature of the resultant changes.  J Physiol. 1987;  391 1 - 11
• 13 Klitgaard H, Mantoni M, Schiaffino S, Ausoni S, Gorza L, Laurent-Winter C, Schnohr P, Saltin B. Function, morphology and protein expression of ageing skeletal muscle: cross-sectional study of elderly men with different training backgrounds.  Acta Physiol Scand. 1990;  140 41 - 54
• 14 Larsson L, Grimby G, Karlsson J. Muscle strength and speed of movement in relation to age and muscle morphology.  J Appl Physiol. 1979;  46 451 - 456
• 15 Narici M V, Roi G S, Landoni L, Minetti A E, Cerretelli P. Changes in force, cross-sectional area and neural activation during strength training and detraining of the human quadriceps.  Eur J Appl Physiol. 1989;  59 310 - 319
• 16 Narici M V, Hoppeler H, Kayser B, Landoni L, Claassen H, Gavardi C, Conti M, Cerretelli P. Human quadriceps cross-sectional area, torque and neural activation during 6 month strength training.  Acta Physiol Scand. 1996;  157 175 - 189
• 17 Sale D G, Martin J E, Moroz D E. Hypertrophy without increased isometric strength after weight training.  Eur J Appl Physiol. 1992;  64 51 - 55
• 18 Tinetti M E, Speechley M, Ginter S F. Risk factors for falls among elderly persons living in the community.  N Engl J Med. 1988;  319 1701 - 1707
• 19 Tracy B L, Ivey F M, Hurlbut D, Martel G F, Lemmer J T, Siegel E L, Metter E J, Fozard J L, Fleg J L, Hurley B F. Muscle quality. II. Effects of strength training in 65- to 75-yr-old men and women.  J Appl Physiol. 1999;  86 195 - 201
• 20 Wesseling K H, Settels J J, van der Hoeven G M, Nijboer J A, Butijn M W, Dorlas J C. Effects of peripheral vasoconstriction on the measurement of blood pressure in a finger.  Cardiovasc Res. 1985;  19 139 - 145
• 21 Wildenthal K, Mierzwiak D S, Skinner N S, Mitchell J H. Potassium-induced cardiovascular and ventilatory reflexes from dog hindlimb.  Am J Physiol. 1968;  215 542 - 548