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Whole body surface cooling before aerobic exercise decreases lactate threshold in cool environment
Author(s) -
Imai Daiki,
Okazaki Kazunobu,
Suzuki Akina,
Takeda Ryosuke,
Naghavi Nooshin,
Matsumura Shinya,
Miyagawa Toshiaki
Publication year - 2012
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.26.1_supplement.lb733
Subject(s) - aerobic exercise , heart rate , lactate threshold , chemistry , zoology , medicine , blood lactate , blood pressure , biology
Whole body surface cooling prior to exercise improves aerobic performance in the heat, while possible effects of the procedure on aerobic performance in cool environment are remained unknown. Sympathetic nerve activity and glycolysis are enhanced by body surface cooling, therefore we hypothesized that whole body surface cooling prior to exercise increased plasma lactate concentration [Lac] p before and during aerobic exercise and declined lactate threshold (LT) in cool environment. Methods Six healthy young women and men performed a graded maximal exercise on a cycling ergometer after pre‐conditioning (60 min) in 3 conditions. The ambient temperature (T a ) and a water perfusion suit temperature (T w ) were controlled at T a 10°C‐T w 10°C in Cool‐Cool (CC), T a 25°C‐T w 10°C in Mild‐Cool (MC), T a 25°C‐T w 34°C in Mild‐Neutral (MN), respectively. [Lac] p , heart rate, blood pressure, expired gas, esophageal (T es ) and skin temperature (T sk ) were measured and LT was determined. Results T es was higher and T sk was lower in CC and MC than MN after pre‐conditioning, respectively. [Lac] p after pre‐conditioning and during each workload of exercise were higher in the order of CC, MC, MN, while LT showed lower values in the same order. [Lac] p at exhaustion was the lowest in CC. Conclusions Whole Body surface cooling before aerobic exercise increased [Lac] p before and during exercise and decreased LT in cool environment.