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Článek

Autonomic cardiac regulation, blood pressure and cardiorespiratory fitness responses to different training doses over a 12 week group program in the elderly

McKune, A J
Autor McKune, A J Discipline of Biokinetics, Exercise and Leisure Sciences, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa Discipline of Sport and Exercise Science, UC-Research Institute for Sport and Exercise, Faculty of Health, University of Canberra, ACT, Australia. Electronic address: mckunea@ukzn.ac.za
Peters, B
Autor Peters, B Discipline of Biokinetics, Exercise and Leisure Sciences, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
Ramklass, S S
Autor Ramklass, S S School of Clinical Medicine, University of KwaZulu-Natal, Durban, South Africa
van Heerden, J
Autor van Heerden, J Discipline of Biokinetics, Exercise and Leisure Sciences, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
Roberts, C
Autor Roberts, C Discipline of Biokinetics, Exercise and Leisure Sciences, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa AFC Bournemouth, Bournemouth, United Kingdom
Krejčí, J
Autor Krejčí, J Faculty of Physical Culture, Palacký University, Olomouc, Czech Republic
Botek, M
Autor Botek, M Faculty of Physical Culture, Palacký University, Olomouc, Czech Republic

Archives of gerontology and geriatrics. 2017 ; 70 (-) : 130-135. [pub] 20170120

Arch Gerontol Geriatr
ISSN 1872-6976
Medvik
Zdroj

AIM: The study assessed the effects of different weekly training frequencies performed over a 12 week exercise programme (strength, endurance, balance) on autonomic cardiac activity, blood pressure and cardiorespiratory fitness (CRF) in elderly individuals. METHODS: Fifty-eight individuals participated in the study: 2TG (N=24, 71.1±6.4 yrs; 19 females, 5 males) performing two, 60min sessions/week; and 3TG (N=34, 72.3±7.9 yrs; 25 females, 9 males) performing three, 60min sessions/week. Time domain and spectral analysis of heart rate variability (HRV) quantified autonomic cardiac regulation. RESULTS: Natural logarithm (Ln) transformation was applied to all HRV parameters. There were significant reductions in total power (Ln TP) (p=0.006), low frequency (Ln LF) (p=0.013), high frequency (Ln HF) (p=0.013) and root mean square of successive differences (Ln rMSSD) (p=0.014) post training in 3TG after intervention. Diastolic BP (DBP) decreased significantly in both groups (2TG: P<0.001; 3TG: P<0.001). Both groups showed significant improvements in six-minute walk distance (2TG: P=0.003, 3TG: P=0.001). However, there were significant HRV differences between 2TG and 3TG for Ln TP (P=0.018), Ln LF (P=0.049), Ln HF (P=0.039) and Ln rMSSD (P=0.049). CONCLUSIONS: A combined exercise programme resulted in improved DBP and CRF irrespective of training two or three 60min sessions/week. However, training three, sessions/week induced negative health-related changes in autonomic cardiac activity through reducing HRV parasympathetic function, while HRV was maintained in the group training twice a week.