title: Respiratory and leg muscles perceived exertion during exercise at altitude.
abstract: We compared the rate of perceived exertion for respiratory (RPE,resp) and leg (RPE,legs) muscles, using a 10-point Borg scale, to their specific power outputs in 10 healthy male subjects during incremental cycle exercise at sea level (SL) and high altitude (HA, 4559 m). Respiratory power output was calculated from breath-by-breath esophageal pressure and chest wall volume changes. At HA ventilation was increased at any leg power output by ∼ 54%. However, for any given ventilation, breathing pattern was unchanged in terms of tidal volume, respiratory rate and operational volumes of the different chest wall compartments. RPE,resp scaled uniquely with total respiratory power output, irrespectively of SL or HA, while RPE,legs for any leg power output was exacerbated at HA. With increasing respective power outputs, the rate of change of RPE,resp exponentially decreased, while that of RPE,legs increased. We conclude that RPE,resp uniquely relates to respiratory power output, while RPE,legs varies depending on muscle metabolic conditions.
authors: TBM Lab, Dipartimento di Bioingegneria, Politecnico di Milano, Milan, Italy.
authors: A
authors: A
authors: Aliverti
authors: B
authors: B
authors: Kayser
authors: A
authors: A
authors: Lo Mauro
authors: M
authors: M
authors: Quaranta
authors: P
authors: P
authors: Pompilio
authors: R L
authors: RL
authors: Dellacà
authors: J
authors: J
authors: Ora
authors: L
authors: L
authors: Biasco
authors: L
authors: L
authors: Cavalleri
authors: L
authors: L
authors: Pomidori
authors: A
authors: A
authors: Cogo
authors: R
authors: R
authors: Pellegrino
authors: G
authors: G
authors: Miserocchi
mesh_terms: D000328:Adult; D000368:Aged; D000531:Altitude; D015444:Exercise / Q000502:physiology* / Q000523:psychology*; D005080:Exercise Test; D006801:Humans; D007866:Leg / Q000502:physiology; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000378:metabolism*; D010465:Perception; D005082:Physical Exertion / Q000502:physiology*; D012123:Pulmonary Ventilation / Q000502:physiology; D012129:Respiratory Function Tests; D015656:Respiratory Mechanics / Q000502:physiology