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Differences in Autonomic Recovery Following Maximal Resistance Exercise in Young and Older Adults
Author(s) -
Schroeder Elizabeth C.,
Rosenberg Alexander J.,
Grigoriadis Georgios,
Wee Sang Ouk,
Fernhall Bo,
Baynard Tracy
Publication year - 2018
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.2018.32.1_supplement.730.1
Subject(s) - medicine , blood pressure , heart rate variability , heart rate , cardiology , autonomic function , photoplethysmogram , baroreceptor , autonomic nervous system , valsalva maneuver , physical therapy , filter (signal processing) , computer science , computer vision
Aging is associated with negative changes in autonomic function and an increased risk of cardiovascular disease. The risk of a sudden cardiovascular event is elevated during and immediately following vigorous exercise, potentially due to increased sympathetic dominance. Because resistance exercise provides a large hypertensive stimulus and young adults show reduced cardiac vagal control during recovery, further exploration of the effects of an acute bout of resistance exercise on autonomic function and recovery in older adults is required. Purpose To evaluate the effects of high‐intensity lower body resistance exercise on autonomic modulation in young (YA) and older adults (OA). Methods Thirty‐five YA (17 female, 26±5 years, BMI: 23.8±3.2 kg/m 2 ) and 25 OA (14 female, 60±6 years, BMI: 29.9±5.4 kg/m 2 ) completed 3 sets of 10 repetitions of maximal isokinetic knee flexion/extension on a force dynamometer in a semi‐recumbent position. Throughout the protocol, participants were instrumented with a 3‐lead ECG and finger‐photoplethysmography for continuous heart rate and blood pressure recordings. Time and spectral components of heart rate (HRV) and blood pressure variability (BPV), non‐invasive indices of autonomic function, were analyzed using five‐minute segments at baseline and 5‐minutes post‐resistance exercise. Results At baseline, OA had higher systolic and mean blood pressure, as well as lower root mean square of successive differences (RMSSD), low‐frequency (LF) RRI, high‐frequency (HF) RRI, and baroreceptor sensitivity (BRS) (p<0.05). At 5‐minutes post‐exercise, LF/HF ratio and LF systolic blood pressure increased (p<0.05). RMSSD, HF RRI, and BRS, were greater at baseline for YA and all variables decreased at 5‐min, while older adults did not change over time (interactions, p<0.05). Conclusions These results suggest YA exhibited parasympathetic withdrawal 5‐minutes post‐exercise, whereas OA either did not exhibit parasympathetic withdrawal or had already recovered at 5 min post exercise, but this cannot be distinguished from our data. Both groups appear to have elevated sympathetic modulation at 5‐min, as indicated by RRI, LF/HF and LF BPV. Further investigation of the response during exercise is required. However, there are clear differences in autonomic recovery following maximal resistance exercise in OA. This abstract is from the Experimental Biology 2018 Meeting. There is no full text article associated with this abstract published in The FASEB Journal .