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What is the central question of this study? Increased respiratory muscle activation is associated with neural and cardiovascular consequences via the respiratory muscle-induced metaboreflex. Does ageing and/or sex influence the arterial blood pressure response during voluntary normocapnic incremental hyperpnoea? What is the main finding and its importance? The increase in blood pressure during hyperpnoea was smaller in younger females than in older females, whereas no difference was found between older males and older females. The blunted respiratory muscle-induced metaboreflex in younger females is normalized with advancing age, whereas ageing has no such effect in males. We hypothesized that older females (OF) have a greater arterial blood pressure response to increased respiratory muscle work compared with younger females (YF) and that no such difference exists between older males (OM) and younger males (YM). To test these hypotheses, cardiovascular responses during voluntary normocapnic incremental hyperpnoea were evaluated and compared between older and younger subjects. An incremental respiratory endurance test (IRET) was performed as follows: target minute ventilation was initially set at 30% of the maximal voluntary ventilation (MVV12) and was increased by 10% of MVV12 every 3 min. The test was terminated when the subject could not maintain the target percentage of MVV12. Heart rate and mean arterial blood pressure (MAP) were recorded continuously. The increase in MAP from baseline (ΔMAP) during the IRET in OM (+24.0 ± 14.7 mmHg, mean ± SD) did not differ (P = 0.144) from that in YM (+24.3 ± 13.4 mmHg), but it was greater (P = 0.004) in OF (+31.2 ± 11.6 mmHg) than in YF (+10.3 ± 5.5 mmHg). No significant difference in ΔMAP during the IRET was observed between OM and OF (P = 0.975). These results suggest that the respiratory muscle-induced metaboreflex is blunted in YF, but it could be normalized with advancing age. In males, ageing has little effect on the respiratory muscle-induced metaboreflex. These results show no sex difference in the respiratory muscle-induced metaboreflex in older adults.
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
August 2016,
Respiratory physiology & neurobiology,
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
April 2021,
American journal of hypertension,
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
May 2024,
Experimental physiology,
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
July 1990,
Zeitschrift fur die gesamte Hygiene und ihre Grenzgebiete,
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
August 2022,
Journal of travel medicine,
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
December 2013,
American journal of hypertension,
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
June 2006,
Psychology and aging,
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
March 2016,
Experimental physiology,
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
January 2018,
Advances in experimental medicine and biology,
Kaori Shimizu, and
Kana Shiozawa, and
Koji Ishida, and
Mitsuru Saito, and
Sahiro Mizuno, and
Hiroshi Akima, and
Keisho Katayama
June 2008,
The American journal of medicine,
