Ischemic Preconditioning of One Forearm Enhances Static and Dynamic Apnea

TY - JOUR

T1 - Ischemic Preconditioning of One Forearm Enhances Static and Dynamic Apnea

AU - Kjeld, Thomas

AU - Rasmussen, Mads Reinholdt

AU - Jattu, Timo

AU - Nielsen, Henning Bay

AU - Secher, Niels Henry

PY - 2014/1

Y1 - 2014/1

N2 - INTRODUCTION: Ischemic preconditioning enhances ergometer cycling and swimming performance. We evaluated whether ischemic preconditioning of one forearm (four times for 5 min) also affects static breath hold and underwater swimming, whereas the effect of similar preconditioning on ergometer rowing served as control because the warm-up for rowing regularly encompasses intense exercise and therefore reduced muscle oxygenation. METHODS: Six divers performed a dry static breath hold, 11 divers swam underwater in an indoor pool, and 14 oarsmen rowed "1000 m" on an ergometer. RESULTS: Ischemic preconditioning reduced the forearm oxygen saturation from 65% ± 7% to 19% ± 7% (mean ± SD; P < 0.001), determined using spatially resolved near-infrared spectroscopy. During the breath hold (315 s, range = 280-375 s), forearm oxygenation decreased to 29% ± 10%; and in preparation for rowing, right thigh oxygenation decreased from 66% ± 7% to 33% ± 14% (P < 0.05). Ischemic preconditioning prolonged the breath hold from 279 ± 72 to 327 ± 39 s, and the underwater swimming distance from 110 ± 16 to 119 ± 14 m (P < 0.05) and also the rowing time was reduced (from 186.5 ± 3.6 to 185.7 ± 3.6 s; P < 0.05). CONCLUSIONS: We conclude that while the effect of ischemic preconditioning (of one forearm) on ergometer rowing was minimal, probably because of reduced muscle oxygenation during the warm-up, ischemic preconditioning does enhance both static and dynamic apnea, supporting that muscle ischemia is an important preparation for physical activity.

AB - INTRODUCTION: Ischemic preconditioning enhances ergometer cycling and swimming performance. We evaluated whether ischemic preconditioning of one forearm (four times for 5 min) also affects static breath hold and underwater swimming, whereas the effect of similar preconditioning on ergometer rowing served as control because the warm-up for rowing regularly encompasses intense exercise and therefore reduced muscle oxygenation. METHODS: Six divers performed a dry static breath hold, 11 divers swam underwater in an indoor pool, and 14 oarsmen rowed "1000 m" on an ergometer. RESULTS: Ischemic preconditioning reduced the forearm oxygen saturation from 65% ± 7% to 19% ± 7% (mean ± SD; P < 0.001), determined using spatially resolved near-infrared spectroscopy. During the breath hold (315 s, range = 280-375 s), forearm oxygenation decreased to 29% ± 10%; and in preparation for rowing, right thigh oxygenation decreased from 66% ± 7% to 33% ± 14% (P < 0.05). Ischemic preconditioning prolonged the breath hold from 279 ± 72 to 327 ± 39 s, and the underwater swimming distance from 110 ± 16 to 119 ± 14 m (P < 0.05) and also the rowing time was reduced (from 186.5 ± 3.6 to 185.7 ± 3.6 s; P < 0.05). CONCLUSIONS: We conclude that while the effect of ischemic preconditioning (of one forearm) on ergometer rowing was minimal, probably because of reduced muscle oxygenation during the warm-up, ischemic preconditioning does enhance both static and dynamic apnea, supporting that muscle ischemia is an important preparation for physical activity.

KW - Adolescent

KW - Adult

KW - Apnea

KW - Athletic Performance

KW - Blood Pressure

KW - Breath Holding

KW - Diving

KW - Exercise Test

KW - Female

KW - Forearm

KW - Humans

KW - Ischemic Preconditioning

KW - Male

KW - Muscle, Skeletal

KW - Oxygen

KW - Stroke Volume

KW - Thigh

KW - Vascular Resistance

KW - Warm-Up Exercise

KW - Young Adult

U2 - 10.1249/mss.0b013e3182a4090a

DO - 10.1249/mss.0b013e3182a4090a

M3 - Journal article

C2 - 23846166

SN - 0195-9131

VL - 46

SP - 151

EP - 155

JO - Medicine and Science in Sports and Exercise

JF - Medicine and Science in Sports and Exercise

IS - 1

ER -