Changes in physiological and stroking parameters during interval swims at the slope of the d-t relationship.
The slope of the distance-time relationship from maximal 200 and 400 m bouts (S(200-400)) has been increasingly employed for setting training intensities in swimming. However, physiological and mechanical responses at this speed are poorly understood. Thus, this study investigated blood lactate, heart rate (HR), stroke rate (SR), stroke length (SL) and RPE responses to an interval swimming set at S(200-400) in trained swimmers. In a 50-m pool, twelve athletes (16.5+/-1.2 yr, 176+/-7 cm, 68.4+/-5.4 kg, and 7.8+/-2.5% body fat) performed maximal 200 and 400 m crawl trials for S(200-400) determination (1.28+/-0.05 m/s). Thereafter, swimmers were instructed to perform 5 x 400 m at this speed with 1.5 min rest between repetitions. Three athletes could not complete the set (exhaustion at 21.0+/-3.1 min). For the remaining swimmers (total set duration=32.0+/-1.3 min) significant increases (p<0.05) in blood lactate (5.7+/-0.8-7.9+/-2.4 mmol/l), SR (29.6+/-3.2-32.1+/-4.1 cycles/min), HR (169+/-11-181+/-8 bpm) and RPE (13.3+/-1.6-16.3+/-2.6) were observed through the IS. Conversely, SL decreased significantly (p<0.05) from the first to the fifth repetition (2.48+/-0.22-2.31+/-0.24 m/cycle). These results suggest that interval swimming at S(200-400) represents an intense physiological, mechanical and perceptual stimulus that can be sustained for a prolonged period by most athletes.
Ribeiro
Luiz Fernando Paulino
LF
Departamento de Ciências da Saúde, Universidade Estadual de Santa Cruz, Brazil. luizfpr@yahoo.com.br
Lima
Manoel Carlos Spiguel
MC
Gobatto
Claudio Alexandre
CA
D000293:Adolescent; D054874:Athletic Performance / Q000502:physiology*; D001938:Brazil; D017079:Exercise Tolerance / Q000502:physiology; D005221:Fatigue / Q000097:blood / Q000503:physiopathology; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology*; D010809:Physical Fitness / Q000502:physiology*; D012044:Regression Analysis; D013550:Swimming / Q000502:physiology*; D055815:Young Adult
D019344:Lactic Acid